Green home loans: how lenders use energy ratings

"Where does the work actually come from?" is the question that comes up most in this segment, and one of the more concrete answers has quietly built up over the last couple of years: banks. A growing number of Australian lenders now write NatHERS ratings directly into their green home loan eligibility criteria — which means a homeowner chasing a rate discount needs exactly what you produce.

Here's which lenders are doing this, what they actually require, and what the Scorecard's closure changed.

The pathway that's now open

These aren't marketing gestures — each of the products below has a real, checkable eligibility bar, and most of them name NatHERS specifically rather than leaving it vague.

CommBank Green Home Offer

CommBank's pathway requires a NatHERS rating of 7 stars or above, alongside a heat pump hot water system, full electrification (no gas), and solar PV sized to the home. For an existing home, that rating comes from an accredited NatHERS assessor inspecting the property — CommBank's own guidance puts a typical assessment at $300–$700.

Bank Australia Clean Energy Home Loan

Backed by the Clean Energy Finance Corporation, this one offers a 0.4% rate discount for up to five years. For new builds it's a 7-star NatHERS minimum, with a further incentive at 7.5 stars and above. The detail worth knowing for existing-homes work is the separate Renovate option: rather than a single star-rating threshold, it requires the home to become fully electric and complete at least three eligible upgrades — insulation, double glazing, and swapping gas appliances for electric are the ones most homeowners land on.

Great Southern Bank Green Home Offer

This one requires a NatHERS rating of 7.5 or above from a NatHERS-accredited assessor — worth naming explicitly, since it's one of the few products that spells out the assessor requirement in its own eligibility wording. The discount is modest at 0.05%, and it's worth flagging honestly to clients: it's currently restricted to properties constructed within the last 12 months, so it doesn't help an older existing home the way the CommBank or Bank Australia pathways can.

NAB also offers reduced rates and discounted Lenders Mortgage Insurance for borrowers who qualify under its own sustainable home loan criteria, though it publishes less detail on the specific rating pathway than the three above.

Why the Scorecard's closure matters here

The Residential Efficiency Scorecard closed permanently on 23 June 2026. Where a lender previously accepted a 7-star Scorecard rating as one of its qualifying paths, that option is now gone — NatHERS, via the existing-homes pathway, is the direct replacement. If you've got former Scorecard clients or contacts who assumed their old rating still counted for something, it doesn't for new loan applications; that's a genuine, timely reason to reach back out.

What this actually means for your book of work

This is demand that doesn't depend on a homeowner being curious about their comfort — it's driven by their bank. A borrower chasing a 0.4% discount over a $600,000 loan has a concrete dollar reason to book an assessment, not just a general interest in energy efficiency, and that's a different, often more reliable, kind of lead than the ones that come from general awareness campaigns. It's also billable in the same range as any other existing-homes assessment — the $300–$700 CommBank cites for an inspection isn't a special "loan assessment" rate, it's the normal job.

For homeowners reading this — is it worth chasing?

If you're already planning to electrify appliances, add insulation, or install solar, it's worth checking whether your own lender has a green home loan product before you do the work anyway — you may qualify for a genuine rate discount for something you were going to do regardless. Start with a free ComfortScore to see where your home actually stands, then book a formal NatHERS assessment once you know which lender pathway you're aiming for, since the eligibility bar differs meaningfully between banks.

Our take

This is one of the more durable demand sources in the segment precisely because it isn't discretionary on the homeowner's part — a bank sets the bar, and someone accredited has to sign off on whether a specific home clears it. As more lenders build NatHERS into their criteria and the Scorecard's old client base looks for a replacement pathway, this becomes a bigger, not smaller, part of where the work comes from.

Frequently asked questions

Which Australian banks currently use NatHERS ratings for green home loans?

CommBank, Bank Australia and Great Southern Bank all name NatHERS explicitly in their eligibility criteria; NAB offers a broader sustainable home loan discount without publishing the same level of rating-specific detail. Source: Savings.com.au.

What does an existing home actually need to qualify for CommBank's Green Home Offer?

A NatHERS rating of 7 stars or above from an accredited assessor, plus a heat pump hot water system, full electrification with no gas, and solar PV sized to the home. Source: Savings.com.au.

How much does an existing-homes NatHERS assessment typically cost for this purpose?

Commonly $300–$700, the same range as a standard existing-homes assessment — there's no separate "loan assessment" pricing tier. Source: Savings.com.au.

Does the Great Southern Bank Green Home Offer help with an older existing home?

Not currently — it requires the property to have been constructed within the last 12 months, alongside a NatHERS rating of 7.5 or above from an accredited assessor, so it suits recent completions rather than older housing stock. Source: Great Southern Bank.

Can a former Scorecard rating still be used for a green home loan?

No — the Residential Efficiency Scorecard program closed permanently on 23 June 2026, and lenders that previously accepted a 7-star Scorecard rating now require a NatHERS rating instead. Source: Transformed.

Two ways to act on this

Assessors: this is exactly the kind of demand MyCool Home routes to accredited partners. Register your interest as an assessor partner.

Homeowners: if you think your renovation plans might qualify for a lender discount, book an accredited assessor and get the certificate your bank actually needs.