Energy Audit and CPE in Luxembourg: Complete Guide 2026
In Luxembourg, the energy audit is an essential tool for planning an effective renovation. Carried out by a certified energy adviser, it assesses the thermal performance of your building and proposes a prioritised action plan to improve its CPE class (Certificat de Performance…
The energy audit in Luxembourg: an essential step
In Luxembourg, the energy audit is an essential tool for planning an effective renovation. Carried out by a certified energy adviser, it assesses the thermal performance of your building and proposes a prioritised action plan to improve its CPE class (Certificat de Performance Energétique — Energy Performance Certificate).
The audit is particularly important in Luxembourg as it determines access to grants under the Klimabonus Wunnen 2026 programme: up to €3,300 for a house or €4,200 for an apartment. Prior approval via MyGuichet.lu before works begin is mandatory.
The CPE: what is it?
The Certificat de Performance Energétique (CPE) is the Luxembourg equivalent of the Belgian PEB or French DPE. It classifies buildings from A (very high performance) to I (very poor) according to their energy consumption:
| CPE class | Consumption (kWh/m²/year) | Rating |
|---|---|---|
| A | < 45 | Excellent (passive or near-passive house) |
| B | 45 - 95 | Very good (major renovation or low-energy building) |
| C | 95 - 150 | Good (recent energy renovation) |
| D | 150 - 210 | Average (post-2000 standard) |
| E | 210 - 280 | Below average |
| F | 280 - 370 | Poor |
| G-I | > 370 | Very poor (energy sieve) |
The CPE is mandatory when selling or renting a property in Luxembourg. It must appear in property listings.
Difference between CPE and energy audit
- CPE: standardised document that classifies the building. Mandatory for sale/rental. Valid for 10 years. Does not propose solutions.
- Energy audit: in-depth analysis with detailed recommendations, step-by-step renovation plan, cost and savings estimates, simulation of the impact on CPE class. Recommended before any renovation.
Energy audit prices in Luxembourg in 2026
| Service | Average price (excl. VAT) | Details |
|---|---|---|
| CPE only (sale/rental) | €500 - €1,000 | Visit + calculation + certificate |
| Full energy audit | €1,200 - €2,500 | CPE + detailed analysis + renovation plan |
| Klimabonus Wunnen energy consultation | €800 - €1,500 | Mandatory prior consultation for major renovations |
| Infrared thermography | €300 - €600 | Visual complement (thermal bridges, infiltrations) |
The energy adviser: a key player
In Luxembourg, the certified energy adviser plays a central role in renovation:
- Carries out the CPE and energy audit
- Validates Klimabonus Wunnen grant applications
- Advises on choice of materials and techniques
- Verifies compliance of works after completion
- List of certified advisers available on myenergy.lu
Calling on an energy adviser before work begins is the best guarantee of optimising your investment and maximising Klimabonus Wunnen grants.
myenergy: one-stop shop for energy renovation
myenergy is the Luxembourg government's advisory service for energy and renovation. Its services (free for private individuals):
- Telephone and online advice on energy renovation
- Referral to certified energy advisers
- Information on Klimabonus Wunnen grants and available support
- Workshops and training for property owners
Request your free quotes
Have your energy audit carried out by a certified adviser in Luxembourg. Receive up to 5 free and non-binding quotes for a CPE or a full audit. Optimise your renovation and maximise your Klimabonus Wunnen grants.
Frequently asked questions
Yes, the CPE is mandatory when selling or renting a property. It must appear in property listings. It is valid for 10 years and must be carried out by a certified expert.
A CPE alone costs €500 to €1,000. A full energy audit with renovation plan costs €1,200 to €2,500. The Klimabonus Wunnen energy consultation costs €800 to €1,500. These amounts are excl. VAT (3% VAT for dwellings more than 2 years old).
The CPE is the Luxembourg certificate, the PEB is the Belgian certificate. Both measure energy performance but use different methodologies. The CPE uses a scale from A to I, the PEB from A++ to G.
The list of certified energy advisers is available on myenergy.lu, the government's advisory service. myenergy also offers free advice by phone and online to guide your renovation project.
A prior energy consultation is required for renovations above a certain amount. Prior approval via MyGuichet.lu before works begin is mandatory. The grant amounts to up to €3,300 (house) or €4,200 (apartment).
Data verified in April 2026
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