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.

Glazing can have a major effect on BASIX compliance because windows influence how much heat a home gains, loses and retains. The size, orientation, frame type, glass type, shading and performance values of windows can all affect heating and cooling loads, which are central to the thermal comfort section of BASIX.

BASIX and Whole of Home are part of the same wider shift in residential energy performance, but they are not the same thing. BASIX remains the NSW sustainability assessment pathway for residential development approvals. Whole of Home is part of the national NCC 2022 move toward assessing the energy use of the entire home, including appliances, solar and batteries.

BASIX and the 7 Star NatHERS standard are closely connected in NSW residential projects because BASIX includes a thermal performance section, and NatHERS is commonly used to assess that thermal performance. For many new homes, this means the design needs to perform well enough thermally before the BASIX Certificate can be finalised for approval.

BASIX and Home Energy Ratings both relate to residential energy performance, but they are used for different purposes. BASIX is the NSW sustainability assessment pathway for residential development approvals. A Home Energy Rating is used to assess the energy performance of an existing home and can help owners, buyers, renters and upgrade programs understand how the home performs and what improvements may be possible.

BASIX and Home Energy Ratings both relate to residential energy performance, but they are used for different purposes. BASIX is the NSW sustainability assessment pathway for residential development approvals. A Home Energy Rating is used to assess the energy performance of an existing home and can help owners, buyers, renters and upgrade programs understand how the home performs and what improvements may be possible.

BASIX and Section J are both connected to building energy and sustainability compliance, but they apply to different project types. BASIX is the NSW pathway for residential development. Section J is part of the National Construction Code and is generally used for commercial and other non-residential building energy efficiency compliance.

Yes. Your BASIX Certificate should match the architectural plans, specifications and approval documents submitted for your NSW residential project. BASIX is not a separate document that sits outside the design. It records sustainability commitments that need to be coordinated with the drawings and then carried through approval, construction and certification.

A swimming pool or spa in NSW may need a BASIX Certificate when it forms part of a residential project or when the pool or spa reaches the relevant volume threshold. BASIX is not only about the dwelling itself. It can also assess the water and energy impact of pools and spas, including their size, heating, pump systems, covers, shading and water top-up arrangements.

BASIX for Granny Flats and Secondary Dwellings

A granny flat or secondary dwelling in NSW will often need a BASIX Certificate as part of the residential approval process. This is because BASIX applies to NSW residential development and assesses water, energy use and thermal performance. For a secondary dwelling, the BASIX pathway depends on the type of project, how the dwelling is created and whether the approval is being lodged as a Development Application or Complying Development Certificate.