Energy renovation prices in Luxembourg in 2026: all rates by type of works
By Yacine Sahnoune, founder of renov.lu
Insulation, heat pump, windows, solar panels, ventilation… What does energy renovation in Luxembourg really cost in 2026? This page compiles real rates collected from verified partner contractors in the Grand Duchy, item by item, with low and high ranges and the net cost after Klimabonus 2026 grants. The aim: to allow you to cost your project accurately before requesting a quote.
- Whole-house renovation: for a 150 m² house (wall and roof insulation, windows, heat pump, solar PV, MVHR), allow on average €80,000 to €120,000 gross in Luxembourg, before grants.
- External wall insulation (ETICS): €180–280 per m² of façade, 3% VAT included; the Klimabonus 2026 pays €60–130/m² (€70–155/m² if the approval in principle is requested before 30 June 2027).
- Heat pump: an air-to-water heat pump replacing a fossil-fuel boiler receives €10,000 of Klimabonus, or €12,000 if ordered before 30 June 2027; a geothermal heat pump receives €12,000 (€14,000).
- Windows: €700–1,300 per triple-glazed PVC window installed; the Klimabonus pays €70 per m² of window (€80/m² if the approval in principle is requested before 30 June 2027) for glazing with Ug ≤ 0.6 W/m²K.
- Solar PV: in self-consumption, the Klimabonus reaches €4,950 for 5 kWp and €10,000 from 15 kWp, in exchange for giving up the guaranteed feed-in tariff (€0.1333/kWh up to 10 kWp for systems commissioned in 2026).
- 3% VAT: on an €80,000 project, 3% VAT instead of 17% saves €11,200; the home must be a main residence at least 10 years old and the contractor must obtain AED approval before the works.
Cost your project in 2 minutes — free simulator and quotes
Use our simulator to accurately estimate the net cost of your energy renovation after Klimabonus 2026 grants. Then compare multiple quotes from verified contractors in Luxembourg, free of charge.
1. Overview of costs — all items
Before going into detail, here is a summary of the price ranges observed in 2026 in Luxembourg for the main energy renovation items. These rates include supply and installation, before grants. The 3% VAT rate — available on renovation works for main residences at least 10 years old — is already included in the ranges shown (a saving of 14 VAT points compared to the standard rate of 17%).
| Type of works | Unit | Low price | High price | Klimabonus 2026 grant (indicative) |
|---|---|---|---|---|
| External wall insulation (EWI) | €/m² façade | €180 | €280 | €60–130/m² (€70–155 until 30/06/2027) |
| Roof / convertible loft insulation | €/m² | €80 | €160 | up to €115/m² (€140 until 30/06/2027), excluding supplements |
| Cold loft insulation | €/m² | €20 | €50 | up to €65/m² (€75 until 30/06/2027) |
| Triple glazing windows (PVC) | €/window installed | €700 | €1,300 | €70/m² of window (€80 until 30/06/2027) |
| Triple glazing windows (alu/wood) | €/window installed | €1,300 | €2,200 | €70/m² of window (€80 until 30/06/2027) |
| Air-to-water heat pump | € complete installation | €12,000 | €24,000 | €10,000 (€12,000 if ordered by 30/06/2027) |
| Ground source heat pump | € complete installation | €25,000 | €45,000 | €12,000 (€14,000 if ordered by 30/06/2027) |
| 6 kWp PV panels (self-consumption) | € complete installation | €10,500 | €13,000 | €5,742 |
| 9 kWh storage battery | € complete installation | €5,500 | €8,500 | up to €2,250 |
| Dual-flow MVHR | € complete installation | €6,000 | €14,000 | €60/m² of energy reference area (€70 until 30/06/2027), max €9,000 (€10,500) |
In Luxembourg, the super-reduced 3% VAT rate applies to renovation works on main residences at least 10 years old, subject to prior approval by the Registration Duties Administration (AED). This represents a saving of 14 points compared to the standard rate of 17%. The prices shown on this page are calculated with 3% VAT.
2. External wall insulation (EWI) — price per m²
External wall insulation (EWI) offers the best efficiency/subsidy ratio in Luxembourg. Walls account for 20 to 25% of a property’s heat losses. Well-executed EWI can reduce heating consumption by 20 to 30% and improve the energy passport rating by up to two classes.
| Façade type / insulation | Low price (€/m²) | High price (€/m²) | Notes |
|---|---|---|---|
| EWI with render finish — polystyrene or mineral wool | €180 | €220 | Most common solution. Thermal resistance R ≥ 3.7 m².K/W recommended. |
| EWI with timber or composite cladding | €200 | €280 | Better aesthetics. Klimabonus eco bonus if bio-sourced material. |
| EWI certified ecological materials (wood fibre, cork…) | €240 | €320 | Klimabonus grant up to €115/m² (€140 if the approval in principle is requested by 30/06/2027), vs €60–85/m² for mineral insulation. |
| IWI (internal wall insulation) — mineral wool or PIR | €60 | €120 | Less effective (thermal bridges). Loss of habitable floor area. |
Total budget for a typical house:
| Configuration | Estimated façade area | Gross cost | Estimated Klimabonus grant | Net cost |
|---|---|---|---|---|
| Terraced house (2 façades) | ~80 m² | €14,400–22,400 | €4,800–9,200 | ~€9,000–16,000 |
| Semi-detached house (3 façades) | ~130 m² | €23,400–36,400 | €7,800–14,950 | ~€14,000–25,000 |
| Detached house (4 façades) | ~180 m² | €32,400–50,400 | €10,800–20,700 | ~€19,000–35,000 |
EWI installed to the required standard has a minimum service life of 30 years. In Luxembourg, the municipality decides: depending on its building regulations, EWI is exempt, subject to a declaration or to a permit. The model regulation proposed to municipalities exempts it outside protected areas and allows it to project up to 0.50 m beyond the building line and setbacks. Check with your municipal authority before signing a quote.
Estimate your Klimabonus grants for EWI in 2 minutes with our simulator.
Simulate my grants →3. Roof and loft insulation — price per m²
The roof accounts for 25 to 30% of heat losses in a poorly insulated property. It is often the first item to address, with the best return on investment — particularly for cold lofts where intervention is quick and relatively inexpensive.
| Insulation type | Low price (€/m²) | High price (€/m²) | Target thermal resistance |
|---|---|---|---|
| Cold loft — blown-in mineral wool | €20 | €40 | R ≥ 7 m².K/W recommended |
| Cold loft — bio-sourced wool (cellulose, hemp) | €30 | €55 | Klimabonus ecological materials bonus |
| Convertible loft — sarking (roof insulation) | €100 | €160 | R ≥ 5 m².K/W recommended |
| Flat roof — slab insulation | €80 | €140 | R ≥ 5 m².K/W recommended |
| Green roof (with insulation) | €130 | €220 | Specific Klimabonus 2026 bonus: +€15/m² |
The new scheme introduces a green roof bonus of +€15/m², cumulative with the ecological materials bonus. A green roof with bio-sourced insulation containing more than 50% recycled content can generate up to +€30/m² in additional grants compared to a standard solution.
4. Window replacement — price per unit and per m²
Windows account for 10 to 20% of a property’s heat losses. In Luxembourg, contractors consistently recommend triple glazing to maximise the Klimabonus 2026 grant, which requires glazing with Ug ≤ 0.6 W/m²K and is calculated per m² of window (external dimensions). A standard 150 m² house has on average 15 to 20 windows, with a total glazed area of 25 to 35 m².
| Window type | Low price (€/unit installed) | High price (€/unit installed) | Indicative Uw |
|---|---|---|---|
| Triple glazing PVC — standard range | €700 | €1,000 | ≤ 0.8 W/m².K |
| Triple glazing PVC — premium range | €1,000 | €1,300 | ≤ 0.7 W/m².K |
| Triple glazing aluminium | €1,300 | €1,800 | ≤ 0.8 W/m².K |
| Triple glazing timber or timber-alu | €1,500 | €2,200 | ≤ 0.7 W/m².K |
| Insulated front door | €1,800 | €3,500 | ≤ 1.3 W/m².K |
For a 150 m² house with 16 standard windows and 1 front door, the full replacement budget is generally between €12,000 and €22,000 in PVC triple glazing — before grants. The Klimabonus grant of €70/m² of window (€80/m² if the approval in principle is requested by 30 June 2027) can represent €1,700 to €2,500 (about €1,950 to €2,850) for this configuration, to which Enoprimes and any municipal grants are added.
To benefit from the windows grant, the glazing must reach Ug ≤ 0.6 W/m²K (triple glazing) and the wall must be insulated (U ≤ 0.85 W/m²K) or the home fitted with MVHR. Require a certified technical data sheet with your quote and verify that your joinery contractor is registered with the Luxembourg Chamber of Trades.
5. Heat pump — installation prices in Luxembourg
The heat pump is the most heavily subsidised heating system in Luxembourg in 2026. Its coefficient of performance (COP) of 3 to 5 means it produces 3 to 5 kWh of heat per 1 kWh of electricity consumed — compared to 1 kWh for 1 kWh from an electric boiler. For a house switching from an oil boiler to an air-to-water heat pump with full insulation, heating bills can be cut by a factor of 4 to 5.
| Heat pump type | Full installation price (gross) | Klimabonus 2026 (fossil boiler replacement) | Estimated net cost |
|---|---|---|---|
| Air-to-water heat pump — recent or renovated house (5–8 kW) | €12,000–16,000 | €12,000 (ordered by 30/06/2027), then €10,000, capped at the cost excl. VAT | ~€350–4,000 |
| Air-to-water heat pump — monobloc (8–12 kW) | €15,000–20,000 | €12,000 (ordered by 30/06/2027), then €10,000 | ~€3,000–8,000 |
| Air-to-water heat pump — split (12–16 kW) | €18,000–24,000 | €12,000 (ordered by 30/06/2027), then €10,000 | ~€6,000–12,000 |
| Ground source heat pump (vertical boreholes) | €25,000–45,000 | €14,000 (ordered by 30/06/2027), then €12,000 | ~€11,000–31,000 |
| Air-to-air heat pump (supplementary solution) | €4,000–10,000 | no grant (not eligible) | €4,000–10,000 |
These prices include equipment, installation, hydraulic connections, circuit filling and commissioning. Additional works (replacing radiators with low-temperature fan coil units, installing underfloor heating) can add €3,000 to €8,000 depending on the property configuration.
With the Klimabonus Wunnen 2026, the condition requiring the old boiler to be at least 10 years old has been removed. Even if your oil or gas boiler is relatively recent, you can now benefit from the full grant to replace it with a heat pump. This major change removes the last barrier for owners who renewed their boiler less than 10 years ago.
Simulate the net cost of your heat pump after Klimabonus grants.
Simulate my grants →6. Solar photovoltaic panels — price by installed capacity
In Luxembourg, the price of a photovoltaic installation ranges between €1,600 and €2,200 per kWp installed from 6 to 15 kWp, and €2,000 to €2,500 per kWp below 4 kWp (supply and installation, excluding battery; details on our solar panel cost page). Since 4 January 2026, a direct pre-financing mechanism allows the installer to deduct the Klimabonus grant directly from the invoice — without waiting for reimbursement from the State.
| Installed capacity | Typical profile | Gross price (€) | Klimabonus self-consumption (indicative) | Estimated net price |
|---|---|---|---|---|
| 3 kWp | Apartment or small house | €6,000–7,500 | €3,168 | ~€2,832–4,332 |
| 6 kWp | Standard family home | €10,500–13,000 | €5,742 | ~€4,758–7,258 |
| 9 kWp | House + heat pump or electric vehicle | €14,500–18,500 | €7,722 (€10,000 from 15 kWp) | ~€6,778–10,778 |
| 12 kWp | Large house or high consumption | €19,500–25,000 | €9,108 | ~€10,392–15,892 |
| 9 kWh battery (add-on) | All profiles with PV ≥ 2 kWp | €5,500–8,500 | up to €2,250 | ~€3,250–6,250 |
In Luxembourg, the feed-in tariff guaranteed for 15 years is €0.1333/kWh up to 10 kWp for an installation commissioned in 2026. The self-consumption mode — with waiver of the guaranteed feed-in tariff — qualifies for the Klimabonus (P × (1,155 − 33 × P) €, i.e. €4,950 for 5 kWp and €10,000 from 15 kWp). For the majority of households, self-consumption with surplus sale is now more cost-effective than full grid injection.
7. Dual-flow MVHR ventilation — installation prices
In a well-insulated property, ventilation becomes the primary source of energy loss if it is not correctly sized. Dual-flow MVHR recovers 70 to 90% of the heat from extracted air to preheat incoming air, reducing heating requirements by 15 to 25%. Its installation is recommended as part of any comprehensive renovation targeting energy class B or A.
| MVHR type | Property area | Full installation price | Estimated annual saving |
|---|---|---|---|
| Self-regulating MVHR — efficiency ≥ 75% | 80–120 m² | €6,000–9,000 | €300–600/year |
| Humidity-controlled MVHR — efficiency ≥ 80% | 100–180 m² | €7,000–11,000 | €400–900/year |
| High-performance MVHR — efficiency ≥ 90% | 120–250 m² | €9,000–14,000 | €500–1,200/year |
In renovation, costs are higher than in new build due to the penetrations required, duct network installation and adaptations to the existing structure. Allow a surcharge of 20 to 50% compared to a new build installation. Dual-flow MVHR is eligible for Klimabonus 2026 grants and the 3% VAT rate.
A poorly maintained dual-flow MVHR can lose 30 to 40% of its efficiency. Filters must be replaced every 6 to 12 months (cost: €40 to €120 depending on the model). Factor this item into your total renovation budget.
8. Full simulation — typical 150 m² house, class F → class B
To give a concrete illustration of the scale of costs, here is a simulation of a comprehensive renovation of a typical Luxembourg single-family house built in the 1980s: 150 m² floor area, 3 façades, oil boiler, single glazing, no insulation. Grants are calculated with the increased 2026 Klimabonus rates (approval in principle requested or heat pump ordered by 30 June 2027), caps included; Enoprimes and municipal grants are not included.
| Type of works | Area / quantity | Estimated gross cost | Klimabonus 2026 grant (indicative, increased rates) | Estimated net cost |
|---|---|---|---|---|
| EWI walls — mineral wool with render (standard III) | 130 m² façade | €26,000 | −€9,100 | €16,900 |
| Roof insulation — sarking, mineral insulation (standard III) | 100 m² | €13,000 | −€7,000 | €6,000 |
| Window replacement — PVC triple glazing | 16 windows (28 m² glazing) | €17,600 | −€2,240 | €15,360 |
| Air-to-water heat pump — oil boiler replacement | 1 installation | €19,000 | −€12,000 | €7,000 |
| 5 kWp PV panels + 5 kWh battery | 1 installation | €14,000 | −€6,756 | €7,244 |
| Dual-flow MVHR | 1 installation | €8,000 | −€4,660 | €3,340 |
| TOTAL | — | €97,600 | −€41,756 | €55,844 |
Move from class F to class B on the energy passport. Heating bill cut by a factor of 4 (from ~€3,000/year to ~€700/year in heat pump electricity). Solar self-consumption covering ~60% of electricity needs. A better class is also a selling point, whose effect on the price depends on the property and the municipality. Municipal grants, the social top-up and the Klimaprêt are not included.
Calculate the net cost of your personalised project with our free simulator.
Use the simulator →9. What really drives prices in Luxembourg
The price ranges presented are averages. In Luxembourg’s reality, several factors can significantly move the final quote:
Shortage of skilled labour in Luxembourg
The Grand Duchy faces a structural shortage of qualified contractors in energy renovation. Strong post-Klimabonus 2026 demand has intensified this phenomenon. Lead times are lengthening (4 to 8 months for some items), and companies with full order books are pricing at the top of the range. Get ahead by requesting quotes as early as possible.
Site accessibility and building complexity
A house with a difficult-to-access façade (steep terrain, garden inaccessible to machinery), multiple angles or complex architecture (bay windows, mansard roofs, setbacks) will see its EWI quote increase by 15 to 30%. Listed buildings or those in protected areas may require specific materials and techniques that significantly add to costs.
Material choice and target performance
A bio-sourced insulation (wood fibre, expanded cork) costs 30 to 60% more than a synthetic insulation (EPS, PIR), but offers better vapour permeability and generates an enhanced Klimabonus grant. For a 150 m² house, the material surcharge can reach €8,000, but the additional grant represents up to €7,000. The net differential is often very small.
Unforeseen additional works
In renovation, surprises sometimes emerge: walls with moisture problems, roof structure to treat, electrical wiring to bring up to standard, underfloor heating to create to optimise the heat pump. Allowing a contingency of 10 to 15% of the total budget is essential. This rule applies even more to properties built before 1970.
Coordination of trades
A comprehensive renovation involves 3 to 5 different trades (façade specialist, carpenter, joiner, heating engineer, electrician). Engaging a project manager or site coordinator represents an extra cost of 3 to 8% of the total, but avoids sequencing errors, delays and disputes — and ensures each trade works in the right order.
10. Return on investment and expected savings
The return on investment of energy renovation is calculated by combining energy bill savings, property value increase and the value of grants received.
| Works carried out | Estimated annual saving | Typical net cost (after grants) | Estimated ROI (energy alone) |
|---|---|---|---|
| Cold loft insulation | €300–600/year | €1,500–3,000 | 4–8 years |
| Window replacement (triple glazing) | €300–500/year | €10,000–18,000 | 20–30 years (better comfort and energy class) |
| External wall insulation | €600–1,200/year | €9,000–25,000 | 8–15 years |
| Air-to-water heat pump (oil boiler replacement) | ≈ €650/year (insulated 150 m² house) | €3,000–12,000 | 5–18 years |
| 6 kWp PV panels (self-consumption) | €550–700/year | €4,758–7,258 | 9–11 years |
| Comprehensive renovation | €2,500–4,000/year | €50,000–70,000 | 13–20 years (excluding any effect on property value) |
In Luxembourg, a comprehensive renovation moving a property from class F to class B also improves its position for sale or rent. No official statistic puts a figure on this value gain: for a flat, the Observatoire de l’Habitat price simulator takes the energy class into account. See the EPC’s impact on price.
11. 5 mistakes that blow the renovation budget
Starting works without prior Klimabonus agreement
The agreement in principle (form DEPA-2026 on MyGuichet.lu) must be obtained before insulation, window or MVHR works begin. Without it, you lose the Klimabonus grants for these works — regardless of their quality. No approval in principle is needed for a heat pump or photovoltaics: the application is filed after installation.
Choosing only the cheapest option without checking certifications
In Luxembourg, only contractors registered with the Chamber of Trades are eligible for Klimabonus works. A quote 20% cheaper but not certified can cost you €10,000 to €20,000 in lost grants. Always require the contractor’s registration number.
Installing the heat pump before insulating the building
A heat pump sized before insulation will be oversized after works, reducing its efficiency and increasing running costs. The optimal order: first the envelope (insulation + windows), then the heating system.
Missing the 3% VAT on eligible works
On a €80,000 project, the 3% VAT represents a saving of €11,200 compared to the standard rate of 17%. It applies if the home (main residence) is at least 10 years old and the contractor has obtained the AED approval before works start, but some contractors omit it or are not eligible. Always check on every quote.
Not setting aside a contingency reserve
When renovating older properties, surprises are common: hidden thermal bridges, moisture problems, non-compliant wiring. Without a contingency of 10 to 15%, an unforeseen event can stall the project or force compromises that are detrimental to the final performance.
12. Frequently asked questions about energy renovation prices
What is the average cost of a comprehensive energy renovation in Luxembourg?
A comprehensive renovation (wall + roof insulation + windows + heat pump + PV + MVHR) for a 150 m² house costs on average between €80,000 and €120,000 gross. After deducting Klimabonus 2026 grants, Enoprimes and 3% VAT, the residual cost is generally between €50,000 and €70,000. Single-item projects (loft insulation, window replacement) start from €2,000 net.
Is the 3% VAT rate automatic in Luxembourg?
Yes, if the property is at least 10 years old and works are carried out by a contractor who has obtained the AED approval: the contractor files the application before works start, you countersign it, and the 3% rate is then applied directly on the invoice. The condition is that works are on a private residential property and the recoverable VAT does not exceed €50,000 in total (maximum €357,000 of eligible works).
Can renovation be financed with a subsidised loan in Luxembourg?
Yes. The Klimaprêt, offered by approved banks (BCEE, BGL, Raiffeisen…), provides a 1.5% interest rate subsidy on an energy renovation loan, up to €100,000 over 15 years. The State can also guarantee the loan up to €50,000 (capital and interest, over 15 years). The loan can cover the residual cost after deduction of Klimabonus grants.
Is an energy audit mandatory before works?
For a multi-element renovation, yes: energy advisory from a certified advisor (free service via the Klima-Agence for a first consultation) is mandatory to assemble the Klimabonus application. For a single-element intervention (e.g. window replacement only), a simplified procedure is possible. The Klimabonus grant for this advice is €1,700 for a house (€2,000 if the approval in principle is requested by 30 June 2027); it is paid as soon as the approval in principle is applied for.
How long does it take to recoup the investment?
Cold loft insulation pays back fastest, in 4 to 8 years. A 6 kWp photovoltaic installation pays for itself in about 9 to 11 years, an air-to-water heat pump in 5 to 18 years depending on the net cost and the price of heating oil. EWI (8 to 15 years) and window replacement (20 to 30 years) take longer on energy alone, but they also improve comfort and the home’s energy class.
Will prices rise in 2026?
Energy renovation contractors are facing strong demand driven by Klimabonus 2026. Lead times are lengthening and prices are trending upward, and the STATEC construction price index rose by 2.6% over one year (April 2026). Getting ahead by requesting quotes quickly allows you to lock in rates before any further increase.
How many quotes should I request for a renovation project?
At least 3 quotes per type of works. Differences of 20 to 30% between contractors are common in Luxembourg. On an overall project of €90,000, comparing 3 quotes can generate savings of €15,000 to €25,000. Renov.lu connects you free of charge with verified contractors in the Grand Duchy.