Technical Booklet D Structure·Page 18·Table 3.1
Building Classes Table
Table 3.1 categorizes buildings into Classes 1, 2A, 2B, and 3 based on building type, height, floor area, and occupancy to determine structural design requirements.
Table 3.1 Building classes
Class Building type by height, floor area and/or occupancy
1
Single family houses of not more than 4 storeys
Agricultural buildings
Buildings into which people rarely go, provided no part of the building is no closer to another building, or area where people go, than a distance of 1.5 times the building height
2A
5 storey single family houses
Hotels, flats, maisonettes and other residential buildings not more than 4 storeys
Offices of not more than 4 storeys
Industrial buildings not more than 3 storeys
Shops and enclosed shopping centres not more than 3 storeys, with each storey having a floor area of not more than 2000 m²
Educational buildings of not more than one storey
All other buildings of not more than 2 storeys, to which members of the public are admitted, with a floor area not greater than 2000 m² at each storey
2B
Hotels, flats, maisonettes and other residential buildings more than 4 storeys but not more than 15 storeys
Educational buildings more than 1 storey but not more than 15 storeys
Shops and enclosed shopping centres more than 3 storeys but not more than 15 storeys
Car parking of not more than 6 storeys
Grandstands accommodating not more than 5000 spectators
All other buildings to which members of the public are admitted which contain floor areas greater than 2000 m² but not greater than 5000 m² at each storey
3
Grandstands accommodating more than 5000 spectators
Buildings containing hazardous substances and/or processes
All buildings defined above as Class 2A and 2B that exceed the maximum limits on the number of storeys and/or floor area
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet D - Structure.pdf