What is a BASIX Certificate?
A BASIX Certificate (Building Sustainability Index) is a mandatory document required for residential developments in New South Wales, Australia. It ensures proposed designs meet sustainability targets in energy and water usage, helping reduce environmental impact and ongoing utility costs.
Short answer
A BASIX Certificate is a NSW Government requirement that verifies a residential development meets sustainability benchmarks for water and energy use, ensuring reduced environmental impact. It’s mandatory for new homes, dual occupancies, renovations >$50,000, and multi-dwelling projects.
Full answer
The BASIX Certificate is part of the NSW planning system designed to ensure homes are built sustainably. It evaluates proposed designs across water usage, thermal comfort, and energy efficiency. Developers, homeowners, or architects input design data into the BASIX tool, which then determines whether the design complies with the sustainability targets.
Once the project meets the requirements, a certificate is generated and must be lodged with your Development Application (DA) or Complying Development Certificate (CDC). BASIX applies to:
- New standalone homes
- Alterations and additions costing over $50,000
- Villas, townhouses, and apartments
Failing to submit a valid BASIX certificate can delay approvals and lead to non-compliance penalties.
Why this matters
With sustainability becoming a national priority, BASIX ensures housing in NSW supports reduced carbon emissions, lower bills, and better living comfort. It plays a vital role in transitioning homes to be more future-ready.
How certified Energy can help
Our team prepares accurate BASIX assessments based on your architectural plans, fast-tracking approval and ensuring compliance. We optimise your design to meet performance targets without costly over-specs.
Related regulations
Helpful resources
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