Wall Insulation Luxembourg 2026 : Klimabonus, EWI and Prices
Table of contents (5)
Klimabonus Wunnen 2026 : Luxembourg's Wall Insulation Grant
Since 4 January 2026, the Klimabonus Wunnen has replaced PRIMe House, managed by the AEV via MyGuichet.lu. Prior approval is mandatory before work begins.
| Insulation type | Klimabonus Grant 2026 |
|---|---|
| EWI — standard materials | €60/m² |
| EWI — certified ecological materials | €115/m² (incl. +€55/m² eco bonus) |
| Enoprimes (Creos/Enovos) | +€10–15/m² additional |
| Maximum cumulative (ecological EWI + Enoprimes) | Up to €127/m² |
| Reduced VAT | 3% instead of 17% |
Requirements: R ≥ 3.7 m²K/W for Klimabonus eligibility. Residential building older than 10 years. Prior approval on MyGuichet.lu before works. Contractor registered with the Luxembourg Chamber of Trades.
Wall Insulation Techniques
| Technique | Description | Installed price (€/m²) | After Klimabonus |
|---|---|---|---|
| EWI — External Wall Insulation | Rigid boards or mineral wool fixed to facade with render finish | €180–280/m² | €65–220/m² |
| IWI — Internal Wall Insulation | Mineral wool between battens + plasterboard (reduces floor space) | €30–60/m² | Not eligible for EWI Klimabonus |
| Cavity wall blown insulation | Cellulose or mineral wool blown into wall cavity | €15–30/m² | Variable depending on R achieved |
| Sprayed polyurethane | PUR foam sprayed on wall, λ=0.022 W/m.K | €40–80/m² | Variable |
Key Insulation Brands for Walls
| Brand | Type | Lambda λ | Application | Key strengths |
|---|---|---|---|---|
| Rockwool Frontrock MAX E | Rock wool | 0.036 W/m.K | EWI (rendered) | Class A1 fire rating, moisture-resistant |
| Knauf Insulation 034 | Rock wool | 0.034 W/m.K | EWI and IWI | High thermal performance |
| Recticel Eurowall | PIR rigid board | 0.022 W/m.K | EWI and cavity | Record-low lambda, minimal thickness |
| Isofloc (cellulose) | Cellulose wool | 0.040 W/m.K | Cavity blown insulation | Ecological material = Klimabonus +€55/m² |
Why Insulate Your Walls in Luxembourg?
- 25–35% of heat loss in an uninsulated home escapes through the walls
- Luxembourg's CPE (energy certificate) affects property resale value
- EWI improves the CPE rating and property value by 5–15%
- ROI: 8–15 years for standard EWI — under 5 years with cumulated grants
Get Free Quotes from Certified Contractors
Compare up to 5 quotes from certified tradespeople in Luxembourg. 100% free, no obligation. Our partners cover the entire Grand Duchy.
Frequently asked questions
The Klimabonus Wunnen 2026 offers €60/m² for EWI with standard materials, or €115/m² with certified ecological materials (cellulose wool, wood fibre, hemp). Enoprimes add €10–15/m², for a maximum cumulative grant of €127/m². VAT is reduced to 3%.
Yes, entirely. PRIMe House was replaced by Klimabonus Wunnen on 4 January 2026. The new scheme offers flat-rate grants (€60 or €115/m² depending on materials) with a major bonus for ecological insulants. Prior approval via MyGuichet.lu is mandatory before work begins.
EWI costs €180–280/m² installed. With Klimabonus (€60–115/m²) and Enoprimes (€10–15/m²), the net cost drops to €65–220/m². A typical project (100 m² facade) = €18,000–28,000 gross, around €6,000–20,000 net after grants. Luxembourg prices are 15–25% higher than in Belgium.
Data verified in April 2026