BASIX is a NSW Government initiative that ensures new homes are designed and built to use less potable water and produce fewer greenhouse gas emissions.

ResidenceBASIX is a flexible tool which allows the user to select from a range of options in order to meet the energy and water reduction targets.

Each development application for a residential dwelling must be submitted with a BASIX Certificate. A certificate is issued once a BASIX assessment has been satisfactorily completed, using an online tool.

The building applicant (e.g. architect, builder, owner builder) is responsible for completing the assessment, ensuring the BASIX commitments are clearly marked on the plans, and submitting the BASIX Certificate with the development application.

BASIX Certificate

The Building Sustainability Index (BASIX) is a web-based planning tool designed to assess the potential performance of residential buildings against a range of sustainability indices.

A BASIX Certificate identifies the sustainability features required to be incorporated in the building design. These features may include sustainable design elements such as recycled water, rainwater tanks, AAA-rated showerheads and taps, native landscaping, heat pump or solar water heaters, gas space heaters, roof eaves/awnings and wall/ceiling insulation.

You need a BASIX Certificate in the Liverpool local government area when BASIX applies to the type of development for which you require approval. Commencement dates and details of types of development are at

The applicant is required to submit the BASIX Certificate with the development application or complying development certificate application.  The plans and specifications must also identify the BASIX commitments which will be checked by a professional building certifier during construction. Where submitted plans or specifications are inconsistent with the relevant BASIX Certificate, Council requires applicants to submit consistent applications before progressing the assessment process, either by amending plans/specifications or by submitting a new BASIX Certificate with commitments that match the rest of the application.

Applicants can generate the BASIX Certificate only on the NSW Department of Planning's BASIX website:  For more information, phone the BASIX Help Line on 1300 650 908.