Energy renovation prices in Luxembourg in 2026: all rates by type of works
Insulation, heat pump, windows, solar panels, ventilation… What does energy renovation in Luxembourg really cost in 2026? This page compiles real rates collected from certified 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.
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 all renovation works for properties over 2 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 | €60–115/m² |
| Roof / convertible loft insulation | €/m² | €80 | €160 | up to €111/m² |
| Cold loft insulation | €/m² | €20 | €50 | up to €55/m² |
| Triple glazing windows (PVC) | €/window installed | €700 | €1,300 | €70/m² of glazing |
| Triple glazing windows (alu/wood) | €/window installed | €1,300 | €2,200 | €70/m² of glazing |
| Air-to-water heat pump | € complete installation | €16,000 | €24,000 | up to €10,000 |
| Ground source heat pump | € complete installation | €30,000 | €40,000 | up to €12,000 |
| 5 kWp PV panels (self-consumption) | € complete installation | €10,500 | €13,000 | up to €7,800 (≈62.5%) |
| 9 kWh storage battery | € complete installation | €6,000 | €9,000 | up to €2,250 |
| Dual-flow MVHR | € complete installation | €6,000 | €14,000 | grant based on performance |
In Luxembourg, the super-reduced 3% VAT rate applies to all renovation works on properties over 2 years old, carried out by a certified contractor. 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 | Enhanced Klimabonus grant up to €115/m² (vs €60/m² standard). |
| 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, a municipal works declaration is mandatory in most cases, and a building permit may be required depending on the municipality if the façade is visible from the public highway. 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 is calculated per m² of glazed area. 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 glazing can represent €1,700 to €2,500 for this configuration, to which Enoprimes and any municipal grants are added.
To benefit from the windows grant, the Uw coefficient of the installed window must meet the technical thresholds set by the Klima-Agence. 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 — monobloc (8–12 kW) | €16,000–20,000 | €9,500–10,000 | ~€7,500–11,500 |
| Air-to-water heat pump — split (12–16 kW) | €18,000–24,000 | €9,500–10,000 | ~€9,500–15,000 |
| Ground source heat pump (vertical boreholes) | €30,000–40,000 | €12,000 | ~€18,000–28,000 |
| Air-to-air heat pump (supplementary solution) | €4,000–10,000 | variable by capacity | variable |
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 €2,000 and €2,300 per kWp installed (supply and installation, excluding battery). 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 | €6,300–7,500 | ~€3,900 | ~€2,400–3,600 |
| 5 kWp | Standard family home | €10,500–12,000 | ~€6,500 | ~€4,000–5,500 |
| 8 kWp | House + heat pump or electric vehicle | €16,000–20,000 | ~€10,000 (cap 15 kWp) | ~€6,000–10,000 |
| 10 kWp | Large house or high consumption | €20,000–25,000 | ~€10,000 (cap) | ~€10,000–15,000 |
| 9 kWh battery (add-on) | All profiles with PV ≥ 2 kWp | €6,000–9,000 | up to €2,250 | ~€3,750–6,750 |
In Luxembourg, the feed-in tariff for electricity injected into the grid is approximately €0.14/kWh for small installations. The self-consumption mode — with waiver of the guaranteed feed-in tariff — offers a higher grant (62.5% of eligible costs, capped at ~€1,562/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.
| Type of works | Area / quantity | Estimated gross cost | Klimabonus + Enoprimes grant (indicative) | Estimated net cost |
|---|---|---|---|---|
| EWI walls — standard insulation with render | 130 m² façade | €26,000 | −€7,800 | €18,200 |
| Roof insulation — sarking | 100 m² | €13,000 | −€8,750 | €4,250 |
| Window replacement — PVC triple glazing | 16 windows (28 m² glazing) | €17,600 | −€1,960 | €15,640 |
| Air-to-water heat pump — oil boiler replacement | 1 installation | €19,000 | −€11,000 | €8,000 |
| 5 kWp PV panels + 5 kWh battery | 1 installation | €14,000 | −€7,900 | €6,100 |
| Dual-flow MVHR | 1 installation | €8,000 | −€2,000 | €6,000 |
| TOTAL | — | €97,600 | −€39,410 | €58,190 |
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. Property value increase estimated at 15 to 20% on the Luxembourg market — that’s +€75,000 to +€100,000 for a €500,000 property. Municipal grants and Klimaprêt not included — they can further reduce the residual cost by €3,000 to €10,000.
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 (but significant property value uplift) |
| External wall insulation | €600–1,200/year | €9,000–25,000 | 8–15 years |
| Air-to-water heat pump (oil boiler replacement) | €1,500–2,500/year | €7,500–12,000 | 4–7 years |
| 5 kWp PV panels (self-consumption) | €700–1,200/year | €4,000–5,500 | 4–6 years |
| Comprehensive renovation | €2,500–4,000/year | €50,000–70,000 | 13–20 years (not counting +15 to +20% property value) |
In Luxembourg, where the property market remains among the highest in Europe, a comprehensive renovation moving a property from class F to class B can generate a value increase of 15 to 20%. For a property valued at €800,000, that is €120,000 to €160,000 in additional value — well beyond the net cost of the renovation.
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 works begin. Without it, you lose all Klimabonus grants — regardless of the quality of the works carried out.
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 automatically if the contractor is certified and the property is over 2 years old, 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 €45,000 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 over 2 years old and works are carried out by a certified contractor. The contractor applies the 3% rate directly on the invoice, without any prior step on your part. 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 act as guarantor for up to 30% of the project cost, capped at €50,000. 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 audit is reimbursed up to €1,500 by the Klimabonus once works are completed.
How long does it take to recoup the investment?
The heat pump and PV panels show the best returns (4 to 7 years net). Cold loft insulation pays back in 4 to 8 years. EWI and window replacement have longer payback periods (10 to 20 years on energy alone), but property value uplift in Luxembourg — 10 to 20% depending on the performance achieved — radically changes the overall calculation.
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, with estimated inflation of 2 to 4% on renovation works in 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 certified contractors in the Grand Duchy.
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 certified contractors in Luxembourg, free of charge.