EPC impact on property prices in Luxembourg: figures, studies and advice
By Yacine Sahnoune, founder of renov.lu
In Luxembourg, a property’s energy class influences its sale price, alongside the municipality, the floor area and the condition of the property. In the second quarter of 2026, an existing flat sold for €7,795/m² on average according to the Observatoire de l’Habitat, whose price simulator takes the energy class into account. No official statistic publishes a single gap between classes A and G. This page explains what is known, what the class changes for a rent or a loan, and which works move a home up the classes.
- Roof insulation: in Luxembourg, insulating the roof or loft offers the best cost-to-EPC-gain ratio: 1 to 2 energy classes gained for an average cost of €8,000–18,000.
- Heat pump: replacing a fossil boiler with an air-to-water heat pump gains 1 to 3 EPC classes; the 2026 Klimabonus is €10,000, or €12,000 if the heat pump is ordered by 30 June 2027.
- Wall insulation: external wall insulation costs €150–300/m² and gains 1 to 2 classes; the Klimabonus is €60–115/m² depending on the material at standard I (€130/m² with non-fossil cladding), capped at 60% of costs excluding VAT.
- Windows: replacement with triple glazing (Ug ≤ 0.6 W/m²K) receives a Klimabonus of €70/m², based on outer dimensions, or €80/m² if approval in principle is requested by 30 June 2027.
- Co-ownership: in Luxembourg, the EPC for a flat in a co-owned building covers the entire building; before buying, an independent thermal audit (€500–1,500) shows the dwelling’s real performance.
Move your property up the energy classes
Find out which works improve the energy performance certificate class, what they cost and which grants they qualify for.
Prices and energy class: what the official data say
The Observatoire de l’Habitat (Ministry of Housing) publishes home sale prices based on notarial deeds. In the second quarter of 2026, an existing flat sold for €7,795/m² on average, and a new flat sold off-plan (VEFA) for €9,809/m². Notarial deeds do not record the energy class: the Observatoire estimates its effect from listings published on Immotop.lu, using a model that compares homes with identical characteristics.
| Data | Value | Source |
|---|---|---|
| Existing flat: average sale price | €7,795/m² (Q2 2026) | Observatoire de l’Habitat |
| New flat (off-plan, VEFA): average sale price | €9,809/m² (Q2 2026) | Observatoire de l’Habitat |
| Effect of the energy class | Estimated property by property, classes A to I | Observatoire price simulator (prices from 1 July 2025 to 30 June 2026) |
| Average gap between classes A and G | No official figure published | — |
For a flat, the Observatoire de l’Habitat price simulator gives an estimate based on the municipality, floor area, extras and energy class. Compare two simulations that differ only in the class: the gap you get is an estimate, with a margin of uncertainty. For a house, ask an estate agent or a valuer who knows your municipality.
Why published gaps vary so much
The gaps quoted by listing portals are based on asking prices, not sale prices. A class A home is often newer, larger or better located than a class G home: the raw gap mixes the class with these other factors. Only a model that compares identical properties isolates the effect of the class.
Prices by municipality and energy class
In Luxembourg, average prices vary widely from one municipality to another. The Observatoire de l’Habitat publishes sale prices by municipality. The effect of the energy class comes on top of the effect of location: for a flat, the price simulator takes it into account in your municipality.
No official source publishes price gaps between energy classes by region. A gap calculated from a few dozen listings can change sharply from one quarter to the next. For your project, reason at the level of your municipality and comparable properties.
For sellers and buyers: direct impact
The energy class plays a part at every stage of a sale: in the listing, which must show the energy performance class and the thermal insulation class, in the negotiation, and then in the financing.
- Lower heating costs: a concrete selling point
- No major energy works for the buyer to plan
- Less room to negotiate on works
- The buyer deducts the cost of the works from the price
- A costed renovation quote helps both sides negotiate
- A buyer who renovates can obtain the Klimabonus (home more than 10 years old)
- High heating costs until the works are done
Compare two amounts: the net cost of the works, after the Klimabonus and 3% VAT, and the price gain you can expect, estimated with the Observatoire simulator or by an estate agent. The works must be finished, and the new energy performance certificate issued, before the property goes on sale. If time is short, a detailed quote handed to the buyer can be enough to defend your price.
If you buy a flat, the published EPC covers the entire building. Your flat can perform much better if it has been renovated, or worse if it is poorly insulated. Always request an independent thermal audit (€500–1,500) before signing.
Impact on rents and rental yield
In Luxembourg, the annual rent of a home is capped at 5% of the revalued invested capital (amended law of 21 September 2006 on residential leases). This cap does not depend on the energy class. A cap varying with the energy performance certificate class was studied as part of the lease reform, but it is not in force.
The class must appear in the rental listing, and the tenant receives a certified copy of the energy performance certificate. A well-rated home costs less to heat: an argument for letting quickly and keeping tenants. The Klimabonus is open to landlords, and renovating a home let as the tenant’s main residence remains eligible for 3% VAT.
EPC and financing: banks and the Klimaprêt
No rule sets a mortgage rate according to the energy class: each bank decides. Some offer specific terms for an energy-efficient home or for financing an energy renovation; compare offers and ask whether the energy performance certificate class is part of their calculation.
| Public scheme | What it provides | Main conditions |
|---|---|---|
| Klimaprêt (interest subsidy) | The State covers 1.5% interest per year, on up to €100,000 over up to 15 years, limited to 10% of the capital | Klimabonus already granted, home more than 10 years old, main residence; no income condition |
| State guarantee | Guarantee of up to €50,000 (capital and interest) over 15 years | Klimabonus approval in principle obtained, main residence, no other home |
Buying a property to renovate? Have the works costed before making an offer and give the bank a complete financing plan: price, works, expected Klimabonus and Klimaprêt. The Klimaprêt is not a zero-rate loan: it is a standard bank loan on which the State pays part of the interest. To gauge the potential of a property rated F or G, see our survey on renovation potential in Luxembourg.
Renovation ROI: is it really worth it in Luxembourg?
The central question: is the net cost of the works lower than what they bring in? The answer depends on the property, the municipality and the works. To find it, add up the heating savings and the estimated effect on the price, then compare them with the net cost after grants.
The calculation method, item by item
| Item | How to obtain it |
|---|---|
| Cost of the works | Detailed quotes, 3% VAT included for a main residence at least 10 years old (benefit capped at €50,000 per home) |
| Klimabonus 2026 | Flat rates set by law: air-to-water heat pump €10,000 (€12,000 if ordered by 30 June 2027), insulation per m², windows €70/m² (€80/m²); insulation grant capped at 60% of the cost excluding VAT |
| Net cost | Cost of the works minus the Klimabonus |
| Energy savings | Current consumption compared with the consumption forecast by the energy advisor |
| Effect on the price | Estimate from the Observatoire de l’Habitat simulator (flats) or an estate agent’s opinion |
| Result | Cumulative savings + effect on the price − net cost |
Works with best cost/EPC gain ratio
Roof or loft insulation
EPC gain: +1 to +2 classes. Average cost: €8,000–18,000. Klimabonus available. Best cost/impact ratio in renovation catalogue.
Replacing fossil boiler with air-water heat pump
EPC gain: +1 to +3 classes. Klimabonus 2026: €10,000 flat rate when replacing fossil-fuel or electric heating, €12,000 if ordered by 30 June 2027. Simultaneous impact on three EPC classes (primary energy, insulation, CO₂).
External wall insulation
EPC gain: +1 to +2 classes. Cost: €150–300/m² depending on insulation and finish. Klimabonus: €60–115/m² (up to €130/m² with non-fossil cladding; higher amounts if approval in principle is requested by 30 June 2027). The grant is capped at 60% of costs excluding VAT.
Window replacement (triple glazing, Ug ≤ 0.6 W/m²K)
EPC gain: +0.5 to +1 class. Klimabonus: €70/m² of window, outer dimensions (€80/m² if approval in principle is requested by 30 June 2027). Immediately visible impact on thermal comfort and valued by buyers.
Do not replace your heating before insulating. Recommended sequence: (1) envelope insulation → (2) ventilation → (3) renewable heating → (4) solar photovoltaic. With this sequence, each euro invested brings the largest class gain.
Frequently asked questions about EPC impact on property prices in Luxembourg
By how much does the EPC increase property value in Luxembourg?
No official statistic publishes a single gap. The Observatoire de l’Habitat estimates the effect of the energy class from listings, for identical characteristics, and builds it into its price simulator for flats. For your property, compare two simulations that differ only in the class, or ask an estate agent for a valuation. Be wary of gaps calculated from asking prices: they mix the class with age, floor area and location.
Does the EPC class affect rents in Luxembourg?
Not the legal cap: the annual rent may not exceed 5% of the revalued invested capital, whatever the energy class. A cap varying with the class was studied as part of the lease reform, but it is not in force. On the market, a well-rated home costs less to heat, which helps to let it.
Is energy renovation worth it before selling a property in Luxembourg?
It depends on the property. Work out the net cost of the works after the Klimabonus and 3% VAT, and compare it with the estimated price gain in your municipality. The works must be finished and the new energy performance certificate issued before the property goes on sale. If time is short, a detailed quote handed to the buyer can be enough to defend your price.
Does the EPC class affect my mortgage rate in Luxembourg?
No rule requires it: each bank sets its own terms, and some offer specific products for an energy-efficient home or an energy renovation. Public support comes through the Klimaprêt: the State covers 1.5% interest per year, on up to €100,000 over up to 15 years, limited to 10% of the capital, once the Klimabonus has been granted.
What is the best work to improve my EPC and increase property value?
Roof or loft insulation: best cost/EPC gain ratio, +1 to +2 classes for €8,000–18,000. Next: air-water heat pump (+1 to +3 classes, Klimabonus 2026: €10,000, or €12,000 if ordered by 30 June 2027). Always start with envelope insulation before heating to maximise ROI.
My property is in co-ownership — does the building EPC apply to my apartment?
Yes, in co-ownership the EPC covers the entire building, not each flat. If you carry out private works (windows, interior insulation), your real performance may be better. Always request an independent thermal audit before buying to know your real performance compared with the building’s EPC class.
Will energy-inefficient homes be banned from letting in Luxembourg?
No, there is no ban on letting a home because of its class in Luxembourg. The European directive on the energy performance of buildings, Directive (EU) 2024/1275, sets renovation targets for the housing stock, but it does not impose a letting ban and has not yet been transposed into Luxembourg law. The class must, however, appear in every rental listing.
Investing in energy renovation?
EPC directly affects your real estate assets. Explore our renovation guides and solutions to improve your energy class.