Renovate
Published on 23 April 20267 min read
Energy Audit Belgium: Price, Process and 2026 Subsidy
The Immolytics editorial team
Energy audit vs EPC certificate: what's the difference?
The EPC is an official diagnosis that assigns a label (A to G). The energy audit is a deep analysis with a detailed renovation plan. The audit studies heat losses post by post, simulates scenarios and computes the ROI.
Energy audit price in Belgium 2026
- Detached house: €700 to €1,500
- Apartment: €500 to €900
- Multi-unit building: €1,000 to €3,000
The home audit in Wallonia: required for the Rénopack
In Wallonia, the energy audit (housing audit) is mandatory to obtain the Rénopack or the Rénoprêt, the loans that replaced the Primes Habitation on 1 October 2026. It must be carried out or updated no more than one year before the loan application. The €660 audit premium disappeared with the Primes Habitation, but the cost of the audit can be financed by the loan. The audit must be performed by an SPW-certified auditor.
How an energy audit runs
- First contact and quote
- Deep site visit (3 to 5 hours): full measurements, optional blower-door test and thermal imaging
- Energy modelling
- Detailed report (15 to 30 pages) within 2 to 4 weeks
- Explanation meeting
What's in the audit report?
- Current energy balance (kWh/m².year and CO₂)
- Identification of weak points
- Itemised action plan: 3 to 5 renovation scenarios with costs and gains
- Estimate of available subsidies (Wallonia, Flanders, Brussels, 6% VAT, green loans)
- Expected payback period
- EPC label before/after per scenario
When to commission an energy audit
Before purchase
Lets you price the renovation work precisely and negotiate the asking price.
Before renovation
Mandatory in Wallonia to obtain the Rénopack or the Rénoprêt. Helps prioritise works to maximise ROI.
F or G rated homes
In Flanders, properties rated E or F must reach at least label D within 6 years of purchase.
Green loans 2026
- Wallonia: Rénopack at 0%, up to €75,000 for a house and €60,000 per apartment, with 10 to 50% not repaid depending on income
- Flanders: Mijn VerbouwLening from 0% to 1.5% depending on income, up to €60,000
- Brussels: ECORENO credit from the Fonds du Logement at 2.5% or 3.5% depending on income, from €1,500 to €25,000
See our 2026 subsidy simulator.
FAQ
Is the audit mandatory for selling?
No, only the EPC is mandatory for sale.
Is the audit still refunded in Wallonia?
Not through a premium any more: the €660 audit premium disappeared with the Primes Habitation on 30 September 2026. Since 1 October 2026, the cost of the audit can be included in the Rénopack or the Rénoprêt.
How long is an audit valid?
No official expiry date, but a refresh is recommended after 5 years. For the Walloon Rénopack and Rénoprêt, however, the audit must be carried out or updated no more than one year before the loan application.
Can an audit be done in co-ownership?
Yes, through the syndic.
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