BASIX, NatHERS and Section J explained
Practical guides for homeowners, builders and designers in NSW. What each certificate is, when you need it, what it costs, and how to avoid failing it.
How much does a BASIX certificate cost in NSW?
What you'll actually pay for a BASIX certificate in NSW in 2026: the portal fee, assessor fees by project type, and the hidden costs that come from a design that fails.
Read article →NCC 2025 Section J: what changes in NSW from May 2027
NSW adopts NCC 2025 on 1 May 2027. Here's what's changing in Section J for commercial buildings — solar PV, battery-ready switchboards, tighter fabric, HVAC and lighting — and what to do now.
Read article →Seven design choices that make BASIX harder to pass
Since the 2023 BASIX changes, more designs fail the thermal section. These are the seven design decisions that cause the most trouble, and what to do about each.
Read article →BASIX vs NatHERS: what's the difference?
BASIX and NatHERS are often confused. Here's what each one measures, how they connect in NSW, and which certificates your project actually needs.
Read article →Do I need BASIX for a renovation or extension?
BASIX applies to NSW alterations and additions costing $50,000 or more, and pools of 40,000 litres or more. Here's how the thresholds work and what gets assessed.
Read article →Section J: DTS report or J1V3 modelling?
The two main ways to comply with NCC Section J: a Deemed-to-Satisfy report or J1V3 energy modelling. What each involves, what it costs, and when each makes sense.
Read article →Send your plans for a fixed quote.
We confirm the assessment scope, required information and fee before work begins. Turnaround is confirmed in your quote and starts once all required information is received.