NatHERS Assessment — What's Involved, What It Costs, How to Book
A NatHERS assessment (also called a home energy rating assessment) is the official 0–10 star evaluation of your home's thermal performance, performed by a domestic energy assessor and registered with CSIRO. Here's what's involved, what it costs, how long it takes, and how to book one near you.
What happens in a home energy rating assessment
1. Book & prep
Request quotes, pick an accredited assessor, send through plans or arrange a site visit (1–2 days).
2. Inspection / plan review
Existing home: 1–2 hour site visit measuring rooms, insulation, glazing, orientation, systems. New build: plans review only.
3. Certificate & report
Thermal modelling in AccuRate/FirstRate5/BERS Pro, official 0–10 star certificate, registered with CSIRO, plus upgrade report (3–7 days).
Who needs a home energy rating assessment?
- New builds & major renovations — legally required under NCC 2022 (minimum 7 stars Australia-wide).
- NSW developments — required for BASIX compliance.
- ACT property sales & leases — disclosure has been mandatory since 1999.
- Existing homeowners planning upgrades — quantifies which improvements will lift your rating most.
- Sellers & landlords — increasingly used to justify price and attract buyers / tenants.
Not sure if you legally need one? Run the disclosure requirements checker →
Typical cost (2026)
- • Apartment / unit: $280–$450
- • Single-storey 3–4 bed: $300–$500
- • Two-storey 4–5 bed: $450–$700
- • Architect-designed: $650–$1,000
Typical timeline
- • Booking → site visit: 3–7 days
- • Site visit (existing): 1–2 hours
- • Modelling & certificate: 3–7 days
- • Total: 5–10 business days
Ready to book your home energy rating assessment?
We'll match you with NatHERS-accredited assessors in your postcode. Free quotes, no obligation.