BASIX / NatHERS
The energy and water certificate — and the upgrade spend people make without needing to.
A new secondary dwelling in NSW requires a BASIX certificate, which sets targets for water and energy performance. You generate it through the NSW Planning Portal's BASIX tool.
The certificate then becomes a set of commitments you must actually deliver and evidence — it isn't just a form at the front of the application.
How the answer is determined for your site — locked
What to ask, and who to ask — locked
How this area costs people money — locked
Pay once, everything is yours
Setbacks & LEP, fire separation, BASIX/NatHERS and bushfire BAL — plus the refusal-reasons checklist, the document checklist, and the full roadmap and budget detail.
Confirm this yourself
BASIX targets and requirements change over time. Generate a current certificate through the NSW Planning Portal for your actual design — do not rely on a figure quoted anywhere, including here.