When is a BASIX Certificate required?

A BASIX Certificate is required for most residential developments in New South Wales. This includes new homes, dual occupancies, multi-unit developments and renovations that cost more than $50,000. It must be submitted with your Development Application or Complying Development Certificate to meet planning and environmental requirements.

Short answer

You need a BASIX Certificate for any new residential dwelling in New South Wales, or for alterations and additions valued at more than $50,000. It is a legal requirement under the NSW planning system.

Full answer

BASIX applies to a wide range of residential projects in New South Wales. The certificate confirms that the proposed design meets sustainability targets across energy, water and thermal performance.

You will need a BASIX Certificate if you are:

• Building a new house, townhouse or unit
• Constructing a dual occupancy on one lot
• Adding or renovating where the total cost is more than $50,000
• Installing a pool or spa with a capacity of 40,000 litres or more

Once the BASIX assessment is complete, a certificate is generated through the online planning portal and must be lodged as part of your planning approval documentation.

Why this matters

BASIX ensures all residential developments meet minimum sustainability standards. It supports long-term cost savings for homeowners and contributes to state-wide targets for energy and water efficiency. Without a valid BASIX Certificate, your application cannot proceed.

How certified Energy can help

Our team provides accurate BASIX assessments that align with your design. We ensure your certificate meets compliance without unnecessary costs, and we guide you through the process so your approval stays on track.

Related regulations

BASIX is legislated under the State Environmental Planning Policy for Sustainable Buildings. Some multi-unit developments may also need to meet National Construction Code Section J requirements. Thermal comfort targets are often assessed using the NatHERS rating system.

Helpful resources

• What is a BASIX Certificate?
• How do I lodge a BASIX Certificate?
• What does a BASIX assessment include?
• How much does a BASIX Certificate cost?