Items where Subject is "Appendix D: Methods of measurement"

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air permeability

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

b2 internal fire spread linings

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

basement storey

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

boundary

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

building

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

building notice

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

building regulations

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

capacity

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

cavity width

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

clear opening width

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

clear turning circle

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

clear width

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

common space

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

communal or common (area facilities or entrances)

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

compartment (fire)

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

compartment wall or floor

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

contrast visually

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

cquivalent area

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

direct distance

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

display window

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

doorset

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

dwelling type

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

element of structure

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

entrance storey

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

equivalent area

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

escape route

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

external wall

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

final certificate

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

fire compartment

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

flue outlet

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

following edge (of door)

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

free area

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

gallery

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

gross internal volume

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

habitable room

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

handover strategy

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

height

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

high-usage entrance door

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

higher risk residential building (hrrb)

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

internal floor

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

internal wall

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

leading edge (of door)

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

liftway

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

live–work units

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

loading bay

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

manoeuvring space

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

measurement

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

occupiable room

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

pitch

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

pitch line

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

principal storey

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

principal works

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

private (area facilities or entrances)

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

purpose group

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

regulation

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

rise

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

sanitary accommodation

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

self-closing device

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

separated part

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

ADB1 Para:UNSPECIFIED Diagram D4 Height of building

Height of building

should

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

single storey

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

ADB1 Para:UNSPECIFIED Diagram D6 Height of top storey in building

Height of top storey measured from upper floor surface of top floor to ground level on lowest side of building
Height of top storey excludes roof-top plant areas and any top storeys consisting exclusively of plant rooms

ADB1 Para:D1 Occupant number

The number of occupants of a room, storey, building or part of a building is either of the following.
a. The maximum number of people it is designed to hold.
b. In buildings other than dwellings, the number of people calculated by dividing the area of
a room or storey(s) (m2) by a floor space factor (m2 per person) such as given in Table D1 for
guidance.

span

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

stair width

ADB1 Para:UNSPECIFIED Diagram D1 Measurement of door width

Effective clear width (door stop to projecting ironmongery)
Effective clear width (door stop to door leaf)

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

storey

ADB1 Para:UNSPECIFIED Diagram D5 Number of storeys

NOTES:
1.In assembly buildings (purpose group 5), a gallery is included as a storey, but not if it is a loading gallery, fly gallery, stage grid, lighting bridge, or any gallery provided for similar purposes, or for maintenance and repair.
2.In other purpose group buildings, galleries are not counted as a storey.
3.For the definition of basement, see Appendix A.

total useful floor area

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

ADB1 Para:UNSPECIFIED Table D1 Floor space factors

NOTES:
1. As an alternative to using the values in the table, the floor space factor may be determined by reference to actual data taken from similar premises. Where appropriate, the data should reflect the average occupant density at a peak trading time of year.
2. Where accommodation is not directly covered by the descriptions given, a reasonable value based on a similar use may be selected.
3. Where any part of the building is to be used for more than one type of accommodation, the most onerous factor(s) should be applied. Where the building contains different types of accommodation, the occupancy of each different area should be calculated using the relevant space factor.
4. For detailed guidance on appropriate floor space factors for concourses in sports grounds refer to Concourses published by the Football Licensing Authority.
5. Alternatively the occupant number may be taken as the number of fixed seats provided, if the occupants will normally be seated.
6. Shops excluding those under item 10, but including: supermarkets and department stores (main sales areas), shops for personal services, such as hairdressing, and shops for the delivery or collection of goods for cleaning, repair or other treatment or for members of the public themselves carrying out such cleaning, repair or other treatment.
7. Shops (excluding those in covered shopping complexes but including department stores) trading predominantly in furniture, floor coverings, cycles, prams, large domestic appliances or other bulky goods, or trading on a wholesale self-selection basis (cash and carry).

ADB1 Para:UNSPECIFIED Diagram D2 Cubic capacity

In every case measure the volume contained by all of the following.
a. Under surface of roof.
b. Upper surface of lowest floor.
c. Inner surface of enclosing walls.
When there is not an outer enclosingwall, measure to the outermost edge of the floor slab.
The measured volume should include internal walls and partitions.
a. Cubic capacity of a building Internal wall or partition
b. Cubic capacity of compartments or separated part of a building
Diagram D2 Cubic capacity

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:UNSPECIFIED Diagram D3 Area

a. Surface area: roofs and rooflights In each case measure the visible area
b. Floor area: Room, garage, conservatory or outbuilding, measure to inner surface of enclosing walls
c. Floor area: Storey, part or compartment, measure to inner surface of enclosing walls and include internal walls and partitions

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:UNSPECIFIED Diagram D7 Free area of smoke ventilators

Free area measured at right angles to air flow
Free area for louvred vent = a1+a2+a3+a4+a5

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

ADB1 Para:D2 Occupant number

Counters and display units should be included when measuring area. All of the following should
be excluded.
a. Stair enclosures.
b. Lifts.
c. Sanitary accommodation.
d. Any other fixed part of the building structure.

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

ADB1 Para:D5 Free area of smoke ventilators

The free area of a smoke ventilator should be measured by either of the following.
a. The declared aerodynamic free area in accordance with BS EN 12101-2.
b. The total unobstructed cross-sectional area (geometric free area), measured in the plane where
the area is at a minimum and at right angles to the direction of air flow (Diagram D7).

travel distance

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

ADB1 Para:D3 Travel distance

Travel distance is measured as the shortest route. Both of the following should be observed.
a. If there is fixed seating or other fixed obstructions, the shortest route is along the centre line of
the seatways and gangways.
b. If the route includes a stair, the shortest route is along the pitch line on the centre line of travel.

utility stair

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

ADB1 Para:D4 Width

Width is measured according to the following.
a. For a door (or doorway), the clear width when the door is open (Diagram D1).
b. For an escape route, either of the following.
i. When the route is defined by walls: the width at 1500mm above finished floor level.
ii. Elsewhere: the minimum width of passage available between any fixed obstructions.
c. For a stair, the clear width between the walls or balustrades. On escape routes and stairs,
handrails and strings intruding into the width by a maximum of 100mm on each side may be
ignored. Rails used for guiding a stair-lift may be ignored, but it should be possible to park the
lift’s chair or carriage in a position that does not obstruct the stair or landing.

This list was generated on Sat Feb 27 22:05:24 2021 UTC.