BASIX does not stop being relevant once a Development Application or Complying Development Certificate has been lodged. For many NSW residential projects, BASIX becomes especially important again at construction certificate stage because the plans and specifications need to show how the BASIX commitments will actually be delivered.

A BASIX Certificate is valid for 3 months before it is submitted to council or an accredited certifier. This means the certificate should be lodged with the Development Application or Complying Development Certificate application within 3 months of being generated. If it is not lodged within that time, a new certificate will need to be generated and additional fees may apply.

Mixed use developments in NSW can require more than one energy or sustainability compliance pathway. If the project includes residential apartments or dwellings, BASIX will usually apply to the residential component. If the same building also includes retail, office, restaurant, commercial or other non-residential areas, those areas may require a separate NCC energy efficiency pathway such as Section J.

Apartment buildings and residential flat buildings in NSW generally need BASIX as part of the residential approval pathway. These projects can be more complex than single dwellings or townhouse rows because the assessment may need to include many apartments, different dwelling types, common areas, central services, lifts, shared gardens, car parks, pools, spas and building-wide energy and water systems.

BASIX for Townhouses and Multi Dwelling Housing in NSW

Townhouses, villas and other multi dwelling housing projects in NSW generally need BASIX as part of the residential approval pathway. These projects can be more complex than a single dwelling because the assessment may need to account for multiple homes, different orientations, shared walls, common areas, central services, private gardens and shared infrastructure.

Dual occupancy projects in NSW generally need BASIX as part of the residential approval pathway. A dual occupancy may be attached or detached, and it may involve two dwellings on one lot, future subdivision, shared services or separate dwelling arrangements. Because there is more than one dwelling involved, the BASIX assessment often needs more careful coordination than a single dwelling project.

Rainwater tanks can be an important part of BASIX water compliance for NSW residential projects. They may help reduce potable water demand by supplying alternative water for uses such as garden irrigation, toilet flushing, laundry or pool top-up, depending on the project and how the tank is connected.

Solar panels can help with BASIX energy compliance in NSW because they reduce the net energy impact of a residential project. In BASIX, solar photovoltaic systems are treated as an alternative energy source. When the project has suitable roof space, good solar access and clear documentation, solar PV can support the energy section of the BASIX Certificate.

Hot water systems can have a significant effect on BASIX energy compliance in NSW residential projects. The system you choose can influence the BASIX energy score, the commitments shown on the BASIX Certificate and the way the project is documented for approval and construction.

Insulation is one of the most important parts of BASIX and NatHERS thermal comfort assessment. It affects how quickly heat moves through the building fabric, including walls, roofs, ceilings and floors. Good insulation can help reduce unwanted heat gain in summer and heat loss in winter, which can improve heating and cooling loads and support a stronger BASIX outcome.