How to become a NatHERS assessor in 2026

"How do I actually get started?" is the question Kath fields more than any other from people weighing up the profession — and it's a fair one, because the pathway runs through a qualification, a choice of accrediting body, a choice of software, and, new this year, a fork between two accreditation streams that didn't used to matter as much as they do now.

Here's the current pathway, with the part that changed in 2026 flagged clearly.

The qualification: CPP41126

The foundation for every current NatHERS assessor is the CPP41126 Certificate IV in Home Energy Efficiency and Sustainability, the national qualification listed on training.gov.au. It covers building energy fundamentals and thermal performance principles, competency in NatHERS-accredited software, and assessment technique, data collection and reporting.

Cost and duration vary meaningfully by registered training organisation (RTO) and delivery mode — this is worth shopping around on rather than assuming a single figure. Some RTOs run it full-time over roughly 10–11 months with a total course fee in the vicinity of $11,000; others offer a fully self-paced online version for under $5,000, with the fee bundling one NatHERS-accredited software licence and its training. Check your shortlisted RTO's current fee and schedule directly — this is one of the few numbers in this field that changes by provider, not by year.

Choosing your accrediting organisation (AAO)

Completing the Certificate IV gets you the qualification; accreditation is a separate step through one of the Assessor Accrediting Organisations (AAOs) recognised by the Department of Climate Change, Energy, the Environment and Water.

New homes — three AAOs to choose from

For the new-homes stream, three AAOs currently operate: the Australian Building Sustainability Association (ABSA), Design Matters National (DMN), and the House Energy Raters Association (HERA). Which one you pick is largely a matter of membership fees, support and community — all three accredit against the same national scheme.

Existing homes — Design Matters National is now the only door

This is the detail worth knowing before you commit time to one AAO over another: Design Matters National was named the exclusive accrediting organisation for the existing-homes stream, effective April 2026. DMN alone now assesses new existing-homes accreditation applications and oversees the ongoing performance of existing-homes assessors. If existing-homes work — the growth segment right now — is the plan, DMN is the pathway, regardless of which AAO you'd otherwise pick for new homes.

Learning the accredited software

Whichever stream you're headed for, you'll need working competency in at least one NatHERS-accredited rating tool. The names that come up across course providers and AAOs are AccuRate (including AccuRate Enterprise), FirstRate5, HERO, and BersPro. Several Certificate IV providers bundle a licence and training for one of these into the course fee, which is worth factoring into your provider comparison above rather than treating as a separate cost later.

New homes or existing homes — or both?

The two streams share the same underlying NatHERS framework but sit in genuinely different parts of the industry. A new-homes assessor works from architectural plans at the design stage, producing the star rating a builder needs for National Construction Code compliance — desk-based, no site visit required. An existing-homes assessor inspects a real, already-built property on site, working with actual insulation, actual windows and actual appliances rather than a plan, and produces the refreshed certificate's star rating plus Home Energy Rating score alongside upgrade recommendations. Nothing stops you being accredited in both, and plenty of assessors are — but given DMN's new exclusive role, if existing homes is where the client demand is, that's the accreditation to prioritise first.

If you're already accredited for new homes

If you already hold new-homes accreditation and are weighing whether to add existing homes, the timing is genuinely favourable right now: a streamlined transition training pathway for eligible assessors is available from mid-2026, and accreditation fees are fully subsidised for currently accredited existing-homes assessors and transition trainees until at least 30 June 2027. A shorter top-up path plus a subsidised fee window is the strongest argument for making the move this year rather than next.

Our take

The genuinely new piece of information for 2026 isn't the qualification — CPP41126 hasn't changed — it's that Design Matters National becoming the sole accreditor for existing homes turns what used to be an open choice of three AAOs into a fork: pick freely for new homes, but go through DMN specifically if existing homes is any part of the plan. Get that one decision right early and the rest of the pathway — course, software, accreditation — is mostly a matter of picking a provider and working through it.

Frequently asked questions

What qualification do I need to become a NatHERS assessor?

The CPP41126 Certificate IV in Home Energy Efficiency and Sustainability, the national qualification listed on training.gov.au, covering building energy fundamentals, NatHERS-accredited software, and assessment technique. Source: Transformed.

Which organisation accredits NatHERS assessors for existing homes?

Design Matters National (DMN) is now the exclusive accrediting organisation for the existing-homes stream, assessing new applications and overseeing assessor performance from April 2026. Source: The Fifth Estate.

Can I still choose between ABSA, DMN and HERA for new-homes accreditation?

Yes — all three remain recognised AAOs for the new-homes stream; DMN's exclusive role applies specifically to existing homes. Source: The Fifth Estate.

What NatHERS-accredited software will I need to learn?

Commonly AccuRate, FirstRate5, HERO or BersPro — most Certificate IV providers include training and a licence for one of these in the course fee. Source: Transformed.

If I'm already a new-homes assessor, is there a faster way to add existing homes?

Yes — a streamlined transition training pathway is available to eligible assessors from mid-2026, alongside accreditation fees fully subsidised for currently accredited existing-homes assessors and transition trainees until at least 30 June 2027. Source: The Fifth Estate.

Accredited? Get homeowners through MyCool Home.

Once you're accredited, the harder problem is usually finding the client, not doing the assessment. Register your interest as an assessor partner and we'll route homeowner demand directly to you.