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Basix & BCA | Basix | Basix key points | Sustainable housing features
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What is BASIX and how does it work?

Introduced by the NSW Government, BASIX ensures homes are built to be more energy and water efficient.

BASIX is on-line program that assesses a house or unit design, and compares it against energy and water reduction targets. The design must meet these targets before a BASIX Certificate can be printed.


Every development application for a new home must be submitted to Council with a BASIX Certificate.

BASIX uses information such as site location, house size, type of building materials and fittings for hot water, cooling and heating.

It is important to realise that the commitments made during the BASIX process are shown on the final certificate and must be marked on the plans, and adhered to during the building process.

Any changes made to the house design means another BASIX assessment must be completed and a new BASIX Certificate submitted to Council.

Who should complete a BASIX assessment?

The BASIX tool is simple to use, and the assessment can be done either by yourself or your building designer. This is best done early on in the design phase, and usually takes about an hour to complete.

If your building designer completes the assessment for you, make sure they discuss the BASIX commitments with you first. Remember, BASIX if flexible. If you dont like one option, there will be an alternative " ring the Help Line if you get stuck.

What are the Energy and Water targets?

BASIX is not a one-size-fits-all approach: it incorporates regional variations such as soil type, climate, rainfall and evaporation rates. The Energy target varies according to building type and location.

The Water target varies between 0 and 40%, according to location. Read the About the BASIX Water Target fact sheet for more information.

The BASIX website has a range of resources:

  • Download the data input checklist " this takes you through the BASIX assessment step-by-step, and shows you all the information will you need;

  • Read the Help Notes " this is a searchable index, that provides information relating to all the questions asked by BASIX;

  • Complete the Tutorial " this shows you exactly how BASIX works, and prepares you for the process.


Basix & BCA | Basix | Basix key points | Sustainable housing features
page 1 of 1