PEB audit & conditions for insulation grants 2026
In Wallonia, the home audit is mandatory to unlock the highest grant rates. In Brussels, the Renolution audit conditions access to the full programme. Cost, accredited auditor, PAE report, PEB label: we explain it all and put you in touch with our accredited partners.
Indicative 2026 costs. The Walloon home audit is partially reimbursed via the audit grant.
Energy audit cost by type
Indicative 2026 costs for a standard single-family home (150 m²). The actual cost varies with the area, the complexity of the building and the accredited auditor. In Wallonia, an audit grant reduces the out-of-pocket cost.
| Audit type | Gross cost incl. VAT, before grant | Out-of-pocket cost after audit grant | Validity report duration |
|---|---|---|---|
| Home audit Walloniamandatory for increased Prime Habitation rates | 750 – 1 200 € | 300 – 600 € (audit grant deducted) | 10 years |
| Renolution audit Brusselsrequired to access the full programme | 900 – 1 400 € | 600 – 1 000 € (partially covered) | 10 years |
| PEB certificatecertificate mandatory for sale or rental | 250 – 500 € | 250 – 500 € (not reimbursed) | 10 years |
Indicative costs incl. VAT. In Wallonia, the audit grant (up to 450 €) can be combined with the insulation grants. See all insulation grants or request your quote for a precise calculation.
The key criteria of the PEB energy audit
The energy audit is not just a formality: it is a tool that maximises your grants and guides your work. Here are the essential points to know.
- When the audit is mandatory
In Wallonia, the prior home audit is mandatory to benefit from the increased Prime Habitation rates (income categories I and II). In Brussels, the Renolution audit conditions access to the full grant programme for whole-home renovation.
See insulation grants → - Income categories
The audit obligation and the grant amounts vary according to your income category. In Wallonia, households in category I (precarious) or II (modest) access the highest rates, which require a prior audit. In Brussels, category A benefits from the maximum amounts.
- Accredited auditor
Only an auditor accredited by the relevant region can carry out a recognised audit. In Wallonia, auditors are certified by the SPW Énergie. In Brussels, they are listed by Brussels Environment. wendows works with a network of accredited partners.
- PAE report
The PAE report (Energy Performance Audit) is the official document issued by the Walloon auditor. It details the recommended works, the expected energy savings and the grants available. It is valid for 10 years and guides the planning of work in stages.
- PEB label
The PEB certificate (Energy Performance of Buildings) certifies the home’s energy label (A++ to G). It is mandatory for sale and rental, and can be updated after work to highlight the improvements made.
- Validity period
The Walloon home audit report and the Brussels Renolution audit are valid for 10 years. The PEB certificate is also valid for 10 years. During this period, you can carry out your work in stages, relying on the auditor’s recommendations.
See insulation prices →
Energy audit and grants: what each region provides
The obligations and aids linked to the audit differ between Wallonia and Brussels-Capital. Here are the essentials for each region.
Home audit + increased Prime Habitation
In Wallonia, the prior home audit is mandatory to access the increased Prime Habitation rates (categories I and II). A separate audit grant (up to 450 €) partially reimburses the cost of the audit. The PAE report is valid for 10 years and plans your work in stages.
- Audit carried out by an SPW Énergie-accredited auditor before the start of the work
- Valid PAE report: recommendations + estimate of energy savings
- Audit grant up to 450 € combined with the insulation grants by zone
- Increased Prime Habitation rates accessible for income cat. I and II
Renolution audit + full programme
The Brussels Renolution programme provides for an energy audit as a gateway to whole-home renovation. The Renolution audit, carried out by a Brussels Environment-accredited auditor, opens access to the full grant programme (insulation, windows, heat pump, solar). It is valid for 10 years.
- Accredited auditor listed by Brussels Environment
- Audit report valid for 10 years, staged planning possible
- Access to the full Renolution programme: insulation, windows, heat pump, PV
- Application submitted within 18 months of the last invoice
We put you in touch with an accredited auditor
wendows works with a network of accredited auditors in Wallonia and Brussels. We coordinate the audit, integrate the recommendations into your quote and build the grant application.
- We check whether the audit is mandatory
Region, income category and planned works: we tell you straight away whether a prior audit is required to maximise your grants.
- We schedule the audit
Introduction to an accredited partner auditor, appointment booking and preparation of the file. The audit takes place before the start of the work.
- We integrate the PAE report
The auditor’s recommendations are integrated into your quote: staged works, target R values, available grants. Your quote shows the real out-of-pocket cost.
- We build the full application
Audit grant forms + insulation grants, compliant technical certificates, PAE report attached: we submit and follow the application through to payment.
Are you in Flanders? The EPC-attest (Flemish PEB certificate) is mandatory before certain works subsidised by the Mijn VerbouwPremie — ask us for the details for your municipality.
Estimate the cost of your audit in a few seconds
Choose the audit type and enter the living area to get an indicative range. The auditor’s quote remains the only way to obtain a precise amount.
Indicative estimate. The actual cost depends on the area, the type of home and the accredited auditor.
Home audit + roof insulation + wall insulation
A concrete case to illustrate how the audit fits into a renovation project: total cost, grants and out-of-pocket cost.
Indicative example dated 2026, income category II, Wallonia. Households in cat. I (precarious) obtain even higher rates. Request your quote for a calculation tailored to your situation.
Dig deeper into your insulation project
- Insulation grants 2026 Overview
All amounts by zone (roof, walls, floor), technical conditions and the full procedure in Wallonia and Brussels.
See all grants → - Roof insulation grants By zone
Details of amounts, R value conditions and procedure for roof insulation in Wallonia and Brussels.
See roof grants → - Insulation prices Costs & quotes
Ranges by zone (roof, walls, floor), cost factors and a worked quote example net of grants.
View the prices →
Your questions on the energy audit and the PEB
Is the energy audit mandatory to apply for insulation grants?
In Wallonia, the prior home audit is mandatory to access the increased Prime Habitation rates (income categories I and II). It is strongly recommended even for the other categories, as it maximises grants and plans the work. In Brussels, the Renolution audit conditions access to the full grant programme.
How much does an energy audit cost in Belgium in 2026?
The Walloon home audit costs between 750 and 1 200 € incl. VAT depending on the area and the complexity of the building. The Brussels Renolution audit ranges from 900 to 1 400 €. In Wallonia, an audit grant (up to 450 €) partially reimburses this cost. The PEB certificate alone costs between 250 and 500 €.
What is the difference between an energy audit and a PEB certificate?
The PEB certificate (or EPC) is a certificate of the home’s current energy label (A++ to G), mandatory for sale and rental. The energy audit is an in-depth analysis that details the recommended works, the expected energy savings and the available grants. The audit generally includes the PEB updated after work.
How long is the PAE report valid?
The PAE report (Energy Performance Audit) is valid for 10 years. During this period, you can carry out your work in stages, relying on its recommendations. Each stage of work can be the subject of a separate grant application.
How do I find an accredited auditor in Wallonia or Brussels?
In Wallonia, accredited auditors are certified by the SPW Énergie and listed on the Wallonia website. In Brussels, they are listed by Brussels Environment as part of the Renolution programme. wendows works with a network of accredited partners: we put you directly in touch.
Can the audit grant be combined with the insulation grants?
Yes. In Wallonia, the audit grant (up to 450 €) can be fully combined with the Prime Habitation insulation grants. The audit even unlocks access to the increased rates by zone, which more than offsets its cost. The net gain is therefore positive in almost all cases for categories I and II.
Audit scheduled, grants maximised, application built
We check whether the audit is mandatory for your situation, put you in touch with an accredited auditor and build the entire grant application: you take care of nothing.
- Introduction to an accredited partner auditor
- Quote net of grant with the PAE report integrated
- Audit grant + insulation grants application built and followed up