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Dwelling types


BASIX applies to all new multiple home developments in NSW.

 This includes units, townhouse rows and subdivisions.

The BASIX assessment tool assesses the sustainability of building designs for multiple home developments by examining the Water, Energy and Thermal Comfort. The BASIX assessment tool multi-dwelling section is specifically designed to suit larger residential developments, especially for unit blocks with common areas such as car parks, lifts and shared gardens which can require significant amounts of water and energy.

New dwellings – multi-dwellings

This tool allows registered users to generate a BASIX certificate if the project involves more than one dwelling, or the development includes common property or services shared with other new or existing development. Typical project types include:

  • a residential flat building - generally three or more units to be strata titled
  • two or more terrace houses, row houses or semi-detached houses, with or without common property or shared services
  • two or more detached or attached houses, including villa units and dual occupancy dwellings on one parcel of land with common property and/or shared services
  • several single dwellings on land subject to subdivision to create new separate lots.

For more information on using BASIX for subdivision projects and large, multi-unit developments, refer to the help note on When is more than one BASIX certificate required?

Note that the DIY method for thermal comfort assessment cannot be used for multiple dwellings. An accredited assessor is required to complete the thermal comfort section using software accredited by the Nationwide House Energy Rating Scheme (NatHERS).

Sustainable multi-unit features encouraged by BASIX

View the features

This is an image of a BASIX multi dwelling house

Some of the sustainable multi features encouraged by BASIX


E1 Light shelves for improved natural lighting

E2 Solar hot water system

E3 Natural light in kitchen and bathroom areas

E4 Compact fluorescent lights with timers in common area lighting

E5 Energy efficient appliances such as refrigerators

E6 Ceiling fans for cooling

E7 Carbon monoxide monitoring to regulate carpark ventilation

E8 Insulated hot water pipe

E9 Energy efficient pool and spa heating

E10 Clothes line on louvred balcony to reduce need for electric drying

E11 On-site electricity and heat generation (cogeneration system)


W1 Storm/rainwater col lection for toilet and garden use

W2 4 STAR rated appliances such as washing machines and dishwashers

W3 3 STAR rated water fixtures - dual flush toilets, shower heads and taps

W4 Native, low water use landscaping

Thermal Comfort

T1 Passive solar orientation

T2 Insulation in ceiling and walls

T3 Cross ventilation allowing air to flow through units, reducing the need for air conditioning

T4 Performance glass

T5 Roof overhang, window eaves, pergolas and louvres to reduce sun's heat

Last updated: 11/03/2024