How Much Does an Energy Rating Cost?

Energy rating costs in Australia depend on the type of assessment required, the size and complexity of your project, and your location. Every new residential build and most significant renovations require an energy efficiency assessment to comply with the National Construction Code. The specific type of assessment varies by state and territory, but the most common are NatHERS ratings, BASIX certificates in New South Wales, and Energy Efficiency Rating (EER) reports in the ACT.

NatHERS Assessment Cost: $400 – $800

A NatHERS (Nationwide House Energy Rating Scheme) assessment is the standard energy rating system used across most of Australia. An accredited assessor uses approved thermal simulation software such as FirstRate5, AccuRate, or BERS Pro to model your home's thermal performance and generate a star rating from 0 to 10. Since the NCC 2022 update, most new homes must achieve a minimum 7-star NatHERS rating.

For a standard single dwelling, expect to pay between $400 and $800. Multi-storey or architecturally complex homes with unusual glazing, multiple building envelopes, or mixed construction materials may cost more. Apartments and multi-residential projects are typically quoted per unit, with prices starting from around $200 per unit for large developments.

BASIX Certificate Cost: $600 – $2,000

In New South Wales, the Building Sustainability Index (BASIX) is mandatory for all new residential developments and major alterations. A BASIX certificate covers energy, water, and thermal comfort benchmarks. It is a broader assessment than a standalone NatHERS rating and typically costs more due to the additional compliance requirements.

Simple single dwellings usually cost between $600 and $1,200 for a BASIX certificate. Complex multi-dwelling developments, mixed-use projects, or designs requiring alternative assessment paths can range from $1,200 to $2,000 or more. The cost also depends on whether NatHERS modelling is required as part of the thermal comfort component.

EER Report Cost: $300 – $600

In the Australian Capital Territory, an Energy Efficiency Rating (EER) report is required for all property sales, leases, and new builds. For existing homes being sold, the cost is typically between $300 and $500. New builds requiring a full NatHERS assessment generally fall into the $400 to $600 range, consistent with NatHERS pricing nationally.

Factors That Affect Energy Rating Cost

Multiple factors influence the final price of your energy rating. Understanding these helps you budget accurately and avoid surprises:

Project size and complexity — Larger homes with multiple zones, split levels, or unusual geometries require more time to model accurately.
Plan quality — Well-documented architectural plans with complete specifications reduce the assessor's time and can lower costs.
Climate zone — Some climate zones require more detailed analysis, particularly those with extreme heat, cold, or humidity.
Number of revisions — Design changes after the initial assessment typically incur additional fees of $100 to $300 per revision.
Turnaround time — Standard turnaround is 5-10 business days. Express services within 48 hours often attract a 30-50% surcharge.
Location — Assessors in regional or remote areas may charge more due to limited competition and travel requirements.

How to Save on Energy Rating Costs

Engaging an energy assessor early in the design phase is the single most effective way to reduce costs. An assessor who reviews your plans before they are finalised can recommend cost-effective changes to glazing, insulation, and orientation that help achieve compliance without expensive redesigns.

Providing complete and accurate plans from the outset also reduces the number of queries and revisions, keeping costs down. If you need multiple assessments for a multi-unit project, many accredited consultants offer volume discounts.

Energy Rating Cost Australia