Project Type

BASIX has five options for the type of development being proposed: 

• One dwelling 
• Two or more dwellings 
  • Dwellings on separate lots 
  • Dual occupancy or residential flat buildings 
• Secondary dwelling to an existing house e.g. Granny flat 
• Alteration or addition to an existing house 
  • Includes a pool and/or spa 
  • Includes a secondary dwelling to an existing house e.g. Granny flat 
• New Pool or spa 

Under each option there are sub-options to select that will influence the way the project is set up in BASIX and which methodology is used. Once selected and the application is started these cannot be changed. If changes are required then a new application needs to be made. 

If you have a combination of dwelling/building types, find out how to enter details for a combination of dwelling/building types in the BASIX tool. 

A BASIX certificate is not required where a development application is being made solely to subdivide land and does not involve the erection of a dwelling. 

The definitions for single dwelling types in BASIX are: 

1. Detached dwelling house - means a dwelling house which is not attached to any dwellings or buildings. 
2. Attached dwelling house - means a dwelling house which is attached to another dwelling or building. 
3. Dwelling above another building - means a dwelling which is above another building or dwelling. 

You also need to enter the number of bedrooms in the dwelling, and indicate whether it is a secondary dwelling (see the definition below). 

If the project includes multiple dwellings, the selections for project type are: 

1. Single dwelling house - one dwelling house (either detached or attached) on its own lot of land. 
2. Multi-dwelling house - one of multiple dwellings (either attached or detached) on one lot of land, each with access at ground level. 
3. Residential flat building - a building containing 3 or more dwellings, but does not include multi-dwelling houses. 

For each dwelling/building type, you need to enter the number of buildings. For each residential flat building, you then need to enter the number of dwellings or units.