Building Codes of Australia (BCA) Classes of buildings

Classification summary of buildings and structures

This list provides the definitions of Building Classes as set out in the Building Code of Australia.

Classes of Building  

Class 1

Class 1a

A single dwelling being a detached house, or one or more attached dwellings, each being a building, separated by a fire-resisting wall, including a row house, terrace house, town house or villa unit.


Class 1b

A boarding house, guest house, hostel or the like with a total area of all floors not exceeding 300m2, and where not more than 12 reside, and is not located above or below another dwelling or another Class of building other than a private garage. 

Class 2

A building containing 2 or more sole-occupancy units each being a separate dwelling.

Class 3

A residential building, other than a Class 1 or 2 building, which is a common place of long term or transient living for a number of unrelated persons. Example: boarding-house, hostel, backpackers accommodation or residential part of a hotel, motel, school or detention centre.

Class 4

A dwelling in a building that is Class 5, 6, 7, 8 or 9 if it is the only dwelling in the building. 

Class 5

An office building used for professional or commercial purposes, excluding buildings of Class 6, 7, 8 or 9. 

Class 6

A shop or other building for the sale of goods by retail or the supply of services direct to the public. Example: café, restaurant, kiosk, hairdressers, showroom or service station. 

Class 7

Class 7a

A building which is a car park. 


Class 7b

A building which is for storage or display of goods or produce for sale by wholesale.

Class 8

A laboratory, or a building in which a handicraft or process for the production, assembling, altering, repairing, packing, finishing or cleaning of goods or produce is carried on for trade, sale or gain. 

Class 9

A building of a public nature.


Class 9a

A health care building, including those parts of the building set aside as a laboratory. 


Class 9b

An assembly building, including a trade workshop, laboratory or the like, in a primary or secondary school, but excluding any other parts of the building that are of another class. 


Class 9c

An aged care building. 

Class 10

A non-habitable building or structure.


Class 10a

A private garage, carport, shed or the like. 


Class 10b

A structure being a fence, mast, antenna, retaining or free standing wall, swimming pool or the like. 


Class 10c

A private bushfire shelter. 

Type of Construction

Rise in storeys

Class of building
2, 3, 9

Class of building
5, 6, 7, 8

4 or more












Note: The classification of buildings and the type of construction can vary from the standard model depicted in the tables. Concessions can be provided that change the type of construction. The concessions can relate to the design of the building, its size, and the number of escapes.