Energy Efficiency Consultant — What They Do & Cost in 2026
An energy efficiency consultant turns an accredited rating into a costed upgrade plan. Here's what a consultant does, what they charge, and how they differ from an energy assessor for residential or commercial work in Australia.
Consultant vs energy assessor — which do you need?
The two roles overlap and many professionals do both, but they answer different questions:
- Energy assessor — accredited (NatHERS, NABERS, Victorian Scorecard, ACT EER) to rate your building against a defined standard and issue a certificate. This is what councils, banks, and rebate programs actually accept. Deliverable: one number (a star rating) and a compliance certificate.
- Energy efficiency consultant — takes the rating (or does the assessment themselves) and produces a strategy: ranked upgrade list with costs, paybacks, rebate eligibility and tender-ready specs. Deliverable: a plan you hand to a builder.
If you just need a certificate for compliance or sale, book an energy assessor. If you're renovating and want to know which upgrades will move the star rating (and stack with rebates), pay the extra $300–$800 for a consultant.
Residential vs commercial scope
| Service | Residential | Commercial |
|---|---|---|
| Compliance rating | NatHERS, Scorecard, BASIX | Section J, JV3, NABERS |
| Audit fee | $300 – $900 | $1,500 – $15,000+ |
| Upgrade design | Insulation, glazing, HVAC | HVAC, BMS, envelope, PV |
| Typical accreditation | ABSA / BDAV / HIA | NABERS / CBD / engineer |
2026 fee ranges by service
| Service | Fee (AUD) | Who books it |
|---|---|---|
| NatHERS existing-home rating | $400 – $900 | Sellers, ACT owners, rebate applicants |
| NatHERS new build (from plans) | $300 – $1,500 | Owner-builders, custom-home clients |
| Renovation strategy + re-rating | $1,200 – $3,500 | Renovators > $50k |
| Section J DtS report | $1,500 – $5,000 | Commercial developers |
| JV3 verification | $4,000 – $15,000 | Class 2–9 buildings |
| NABERS rating | $3,000 – $8,000 | Office / hotel / apartment owners |
When to hire one
- • Planning a renovation > $50k
- • Targeting 7+ stars on a custom build
- • Specifying a heat pump or HVAC swap
- • Applying for a green loan or rebate stack
- • Commercial fit-out or DA condition
What you should receive
- • Baseline rating + report
- • Ranked upgrade list with $ & payback
- • Tender-ready specifications
- • Rebate / loan eligibility map
- • Post-upgrade re-rating
How to verify an energy efficiency assessor
- NatHERS accreditation number — every residential energy efficiency assessor has an ID from Design Matters National or ABSA. Check it against the NatHERS national register.
- NABERS-accredited for commercial ratings — the assessor's name must appear on the NABERS public assessor list.
- Engineering qualification for JV3 or Section J — a mechanical or building-services engineer, not just a Cert IV holder.
- Insurance — professional indemnity and public liability, both current.
Find an energy efficiency assessor near you
Browse accredited energy efficiency assessors and consultants by state and city, or get free quotes from up to three local experts.