Finding an energy renovation company in Luxembourg: the complete guide 2026
Choosing the wrong company for your energy renovation means risking the loss of your Klimabonus subsidies — and paying for underperforming works. In Luxembourg, companies eligible for state grants must be registered with the Chamber of Skilled Trades and hold an establishment authorisation issued by the Ministry of Economy. For works qualifying for the Klimabonus, the company must also hold the « Klima-Agence certified artisan » qualification, which allows it to submit subsidy applications directly on your behalf. This guide explains exactly how to identify, compare and select the right certified tradesperson for your project — to maximise your grants and secure the quality of your works.
Why the choice of company is decisive for your energy renovation
Energy renovation of a home in Luxembourg is a decision involving several tens of thousands of euros and directly conditions access to substantial public grants. In 2026, the combination of Klimabonus + Enoprimes + 3% VAT + municipal grants can cover a very significant share of your total works cost — but only if the mandated company meets the required conditions. Entrusting your project to an unqualified or improperly registered tradesperson exposes you to two major risks: the total loss of your subsidies and technically insufficient works that do not actually improve your energy class.
The Luxembourg energy renovation market is particularly competitive. Hundreds of companies offer insulation, heat pump or window replacement services, with prices sometimes varying by a factor of three for very variable quality of work. Tradesperson hourly rates in Luxembourg vary by speciality: a bricklayer or floor screeder generally charges between €60 and €80/hour, an electrician between €80 and €110/hour, a plumber-heating engineer between €70 and €90/hour. These ranges give no indication of technical mastery of the specific challenges of energy renovation — airtightness, thermal bridges, controlled mechanical ventilation — which require dedicated training.
In Luxembourg, only a tradesperson holding the « Klima-Agence certified artisan » qualification can submit Klimabonus applications directly on your behalf, without going through an independent energy advisor. This is a concrete advantage in terms of timescale and administrative simplicity.
Legal requirements: what every renovation company must have in Luxembourg
Before even assessing a tradesperson’s technical skills, you must ensure they operate legally in the Grand Duchy. Here is the essential regulatory foundation.
The establishment authorisation issued by the Ministry of Economy
To carry out craft activities in Luxembourg, the company manager must hold an establishment authorisation issued by the Ministry of Economy (establishment authorisation service). This authorisation is granted if the manager can demonstrate the required professional qualifications (master craftsman certificate, bachelor’s degree or recognised equivalent) and if the company has a fixed place of business on Luxembourg territory — a registered address or mere domiciliation address is not sufficient. This condition automatically excludes many cross-border companies that operate informally without formal authorisation in the Grand Duchy.
Registration with the Chamber of Skilled Trades
Every craft company active in Luxembourg must be registered with the Chamber of Skilled Trades and enrolled in the National Register of Companies (RNE) — or in the Trade and Companies Register (RCS) if it also carries out commercial activities. You can verify a company’s existence and status directly on the Luxembourg Business Registers (LBR) portal. This check takes less than a minute and can save you from entrusting your project to a phantom company.
Professional liability insurance and ten-year guarantee
Although Luxembourg legislation differs from French law, any serious company must be able to provide evidence of professional public liability insurance. For structural works — foundations, load-bearing structure, waterproofing — explicitly request a ten-year guarantee covering defects for ten years after completion. Do not hesitate to request a copy of the insurance certificate before signing anything.
Foreign companies (Belgian, French, German) can legally carry out occasional and temporary service provision in Luxembourg without a permanent establishment authorisation — provided their activity genuinely remains temporary. In practice, if a company regularly works on projects in Luxembourg, it must hold an establishment authorisation. If in doubt, ask for their Luxembourg registration number.
The « Nohalteg an d’Zukunft + » label: Luxembourg’s reference craft certification
Since 2022, the « Nohalteg an d’Zukunft + » label (literally « Sustainably into the future + ») has replaced the former « Energie fir d’Zukunft + » label, which had existed since 2012. This label is awarded by the Luxembourg Chamber of Skilled Trades, in collaboration with the Energieagence (Klima-Agence), upon completion of a specific continuing training programme in the construction and renovation of high energy performance buildings.
What does this label actually certify?
To obtain the « Nohalteg an d’Zukunft + » label, the company’s manager or an employee must pass the final examination of one of the two basic training programmes offered by the Chamber of Skilled Trades:
Duration: 3 days + final examination. Focused on new construction to passive standard (mandatory in Luxembourg since 2017). Also awards the « Certified passive house tradesperson » certificate from the German Passivhaus Institut.
- Building envelope mastery
- Advanced thermal insulation
- Ventilation and building technology
- Thermal bridges and airtightness
Duration: 2.5 days + final examination. Specifically focused on renovation of existing buildings. Also awards the « Klima-Agence certified artisan » qualification, essential for Klimabonus subsidies.
- Assessment of existing condition
- Interior and exterior thermal insulation
- Airtightness and thermal bridges in renovation
- Ventilation and heat production in renovation
The label is personal (awarded to an individual) but may be used by the craft company as a whole. Its validity period is 5 years, renewable through one-day supplementary training courses. Since 1 January 2024, these training programmes are funded by the European Union and the Luxembourg Ministry of Labour under the « Invest in the Future » programme — meaning companies can participate free of charge, plus a « Compétence Climat » bonus of €135 per participant per 8-hour block.
To search for a « Nohalteg an d’Zukunft + » labelled tradesperson in your area, the Chamber of Skilled Trades offers an online search tool on its website (cdm.lu).
The « Nohalteg an d’Zukunft + » label is proof that the tradesperson has mastered the technical specifics of energy renovation in Luxembourg — including interactions between the various trades. It is a guarantee of execution quality, not merely an administrative formality.
Klima-Agence certified artisan: the essential qualification for your subsidies
The « Klima-Agence certified artisan » qualification is awarded to tradespeople who have passed the « Energy renovation tradesperson » training and examination at the Chamber of Skilled Trades. It has considerable practical implications for you as a property owner.
What it concretely changes for your applications
Before this qualification was introduced, any property owner wishing to obtain the Klimabonus for renovation works was required to go through an independent energy advisor to submit the subsidy application. This advisor represented an additional cost and delay.
Today, for individual energy renovation measures — window replacement, façade insulation, loft insulation, attic insulation (external or internal thermal insulation) — a tradesperson holding the « Klima-Agence certified artisan » qualification can submit the Klimabonus application directly to the Klima-Agence on behalf of their client. This significantly simplifies and speeds up the administrative process.
For more complex comprehensive renovation projects (including, for example, heating system replacement combined with full insulation), a Klima-Agence approved energy advisor remains necessary to prepare the in-principle agreement application file. Your certified tradesperson can point you towards the right contacts.
How to verify a tradesperson’s qualification
Several means allow you to verify that a tradesperson genuinely holds the « Klima-Agence certified artisan » qualification:
- Ask them directly for their certificate or proof of qualification (the document is personal and dated)
- Use the Chamber of Skilled Trades search tool (cdm.lu) to find « Nohalteg an d’Zukunft + » labelled tradespeople in your area — all holders of the energy renovation pathway also hold the Klima-Agence qualification
- Consult the list of certified advisors and tradespeople on the Klima-Agence website
Estimate your grants before choosing your company. Our simulator calculates in 2 minutes the Klimabonus, Enoprimes and reduced VAT you are entitled to based on your planned works.
Simulate my grants →The 7 essential criteria for choosing your energy renovation company
Beyond the mandatory regulatory checks, here are the concrete criteria that distinguish a reliable company from a mediocre one in the Luxembourg energy renovation market.
The Klima-Agence certified artisan qualification
This is the non-negotiable criterion for any project benefiting from the Klimabonus. Without this qualification, your tradesperson cannot submit the subsidy application for works eligible under individual renovation measures. Always request proof of this certification before any quote.
Documented experience on similar projects in Luxembourg
The Luxembourg market has its specificities: older stone or concrete buildings from the 1960s-1980s, local regulations, administrative timelines specific to the Klima-Agence. Prioritise a company with at least 5 years of documented experience on similar renovations in the Grand Duchy. Do not hesitate to request references for recent projects (under 3 years) with contactable clients.
Mastery of the subsidy application process
The best energy renovation companies in Luxembourg have developed complete administrative expertise: preparation of the Klimabonus application file, coordination with energy audit firms for the energy passport, follow-up of the in-principle agreement with the Klima-Agence. A tradesperson who tells you « manage the subsidies yourself » is not the right partner for an optimised energy renovation project.
Quote transparency and itemised breakdown
A serious quote details every item: supplies (with material brands and references), labour, waste disposal, making good. Beware of package quotes without breakdown — they make any comparison impossible and leave the door open to costly variations. The quote must also explicitly mention the grants to which the works entitle you and their impact on the final net cost.
Current professional insurance
Request a professional public liability insurance certificate dated less than 12 months ago. For works affecting the building’s airtightness (roof, façade, joinery) or heating, verify the existence of a guarantee covering defects over the long term. A company that hesitates or refuses to provide this document must be eliminated from your selection.
Verified client reviews and references on recent projects
Check online reviews on multiple platforms (Google, Houzz, etc.) focusing on recent reviews (last 12 to 24 months). A good tradesperson will not hesitate to put you in contact with recent clients for a visit to a completed project. Be wary of companies that only offer references more than 5 years old.
Trade coordination if your project involves multiple disciplines
A complete energy renovation often involves several specialities: insulation (façade, loft, floor), joinery (windows, doors), heating (heat pump), ventilation (dual-flow MVHR). Some Luxembourg companies offer comprehensive management with subcontractor coordination. Others deliver only their own scope of work. Clarify this point before signing: who is responsible for the project? Who coordinates the various trades?
How to obtain and effectively compare quotes in Luxembourg
How many quotes should you request?
The standard practice in Luxembourg is to obtain a minimum of 3 quotes for an energy renovation project. Fewer than 3 does not give you sufficient perspective to assess whether a price is consistent with the market. More than 5 or 6 becomes time-consuming and counterproductive. The golden rule: compare strictly equivalent services, with the same materials, the same areas and the same finish levels.
What a complete quote must contain
| Quote element | What you should find | Red flag |
|---|---|---|
| Company identification | Name, Luxembourg address, RCS/RNE number, establishment authorisation number | No Luxembourg physical address |
| Works description | Item-by-item detail, areas, thicknesses, material brands | Package quote without breakdown |
| Materials and products | Precise references, thermal resistance values (R or U) for insulation | Vague mention « compliant insulation » |
| Labour | Number of days or hours per item, hourly rate | Labour not distinguished from supplies |
| Grants deducted | Mention of applicable Klimabonus and/or Enoprimes, net cost | Complete silence on grants |
| VAT | 3% VAT for eligible homes (over 2 years old, residential use) | 17% VAT without explanation |
| Timelines | Estimated start and end date, interim milestones | No timeline or very vague timeline |
| Guarantees | Guarantee period on materials and labour | No mention of guarantee |
Reference price ranges by type of works in Luxembourg
The prices below are indicative ranges recorded on the Luxembourg market in 2026. They include supply and installation, before state grants. Your final quote will depend on your property’s configuration, location and the complexity of the works.
| Type of works | Price range (supply + installation) | Notes |
|---|---|---|
| Loft insulation (blown mineral wool) | €15 – 35/m² | Among the most cost-effective works |
| Roof insulation from inside (excluding sarking) | €60 – 120/m² | Depends on height and complexity |
| External thermal insulation (ETI — façade) | €120 – 250/m² | Depending on thickness and finish (render, cladding) |
| Window replacement (double or triple glazing) | €800 – 1,800/window | Depending on dimensions and frame material |
| Air-to-water heat pump (supply + installation) | €12,000 – 22,000 | Before Klimabonus deduction (up to €10,000) |
| Dual-flow MVHR (controlled mechanical ventilation) | €4,000 – 9,000 | Depending on area and number of rooms |
| Energy audit (energy passport) | €475 – 600 | State-subsidised up to €1,500 |
Sources: data collected from certified partner tradespeople in Luxembourg, 2026. Indicative ranges, before state grants.
Steps in an energy renovation project in Luxembourg
Understanding how a project unfolds allows you to choose your company at the right time and not skip steps — particularly the Klima-Agence in-principle agreement, which must precede the start of works without exception.
Initial estimate and project selection
Start by simulating your grants and identifying priority works. You can use our online simulator, which calculates in a few minutes the Klimabonus, Enoprimes and reduced VAT you are entitled to. This is also the stage at which you define whether you are targeting a partial or comprehensive renovation.
Energy audit and energy passport
For comprehensive renovation projects qualifying for the Klimabonus, an energy audit carried out by a Klima-Agence approved expert is essential. This audit establishes your home’s current energy passport (from class A to class I) and identifies works to prioritise. The audit cost (between €475 and €600 depending on area) is partially covered by a state subsidy of up to €1,500. Your renovation company can put you in contact with a partner audit firm.
In-principle agreement application to the Klima-Agence
Before starting works, you must obtain an in-principle agreement from the Klima-Agence. This agreement conditions the granting of the Klimabonus: without it, you will not receive the subsidies, even if the works are carried out by a certified company. If your tradesperson is a « Klima-Agence certified artisan », they can submit this application on your behalf (for individual measures). For a comprehensive project, an approved energy advisor is required. The time to obtain the in-principle agreement varies; allow for this before signing the contract.
Company selection and quote comparison
This is the stage at which you request your quotes (minimum 3) from certified tradespeople. Comparison must be done on identical bases: same materials, same areas, same finish level. It is recommended to target an improvement of at least two energy classes to maximise available grants.
Carrying out the works
Works must be carried out in accordance with the technical specifications validated in the in-principle agreement. Your tradesperson must establish a commissioning protocol at the end of works. Keep all detailed invoices — they will be necessary for grant settlement.
Settlement file and grant payment
After works, you (or your certified tradesperson) submit the settlement file to the Klima-Agence with paid invoices and the final energy passport. Grant payment occurs after file validation. For Enoprimes (Enovos/Creos), the process is separate and must be completed on the enoprimes.lu portal.
It is recommended to target an improvement of at least two energy classes to maximise the amount of available grants. A home moving from class G to class D will benefit from significantly higher Klimabonus amounts than one improving by just one class. Your energy advisor and certified tradesperson can help you define this target from the design phase.
Questions to ask a tradesperson before signing a contract
Here is the list of concrete questions to ask during your interviews with pre-selected companies. A serious tradesperson will answer all of these questions without hesitation.
| Question to ask | What the answer reveals |
|---|---|
| « Are you a Klima-Agence certified artisan? » | Ability to submit Klimabonus applications for individual measures |
| « Can you show me your Luxembourg establishment authorisation? » | Legal status in the Grand Duchy |
| « Who will manage my Klimabonus file? » | Level of administrative service included in the service |
| « Can you provide your professional public liability insurance certificate? » | Coverage in case of defective work or incident |
| « Do you have references from similar projects in Luxembourg? » | Actual experience on comparable projects |
| « Which materials do you propose and why? » | Technical mastery and suitability for the project |
| « Who actually carries out the works: your own team or subcontractors? » | Quality control and accountability in case of issues |
| « What is the realistic timeline between order and start of works? » | Actual team availability |
The 5 classic pitfalls to avoid when looking for a tradesperson in Luxembourg
Pitfall 1 — Signing before the Klima-Agence in-principle agreement
This is the most costly mistake. If you start works before obtaining the Klima-Agence in-principle agreement, you permanently lose your right to the Klimabonus for those works — regardless of the quality of the tradesperson or materials used. The rule is simple and without exception: the in-principle agreement always precedes the start of works.
Pitfall 2 — Choosing solely on the basis of the lowest price
A quote significantly lower than the others often masks the use of lower-quality materials, insufficient insulation thickness, or poorly qualified labour. In energy renovation, savings made on materials are paid for in high energy consumption for years. Insulation installed at insufficient thickness or untreated thermal bridges cancels much of the expected benefit.
Pitfall 3 — Failing to verify qualifications and insurance
Online and through certain platforms, it is easy for an unqualified company to present itself as an energy renovation specialist. Verifying the Luxembourg establishment authorisation and the Klima-Agence certified artisan qualification takes less than 5 minutes and can save you months of dispute. Never consider a tradesperson without these prior checks.
Pitfall 4 — Overlooking the 3% VAT rate
In Luxembourg, renovation works on a residential property over 2 years old benefit from the reduced VAT rate of 3% instead of 17%. On a €30,000 project, this represents a saving of €4,200 — not negligible. Some companies automatically invoice at 17% if the client does not mention it. Explicitly state this condition in your quote request.
Pitfall 5 — Forgetting the Enovos and Creos Enoprimes
The Klimabonus is the best-known subsidy, but the Enoprimes paid by network managers (Enovos and Creos) are stackable and can represent significant additional amounts depending on the works carried out. These grants are managed separately on the enoprimes.lu portal and have their own application deadlines. An experienced tradesperson will inform you of these grants from the quote phase.
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Frequently asked questions
What is the difference between the « Nohalteg an d’Zukunft + » label and the « Klima-Agence certified artisan » qualification?
They are two complementary but not identical recognitions. The « Nohalteg an d’Zukunft + » label is awarded by the Luxembourg Chamber of Skilled Trades: it certifies that a tradesperson has completed and passed specific training in the construction or renovation of high energy performance buildings. The « Klima-Agence certified artisan » qualification is awarded by the Klima-Agence upon passing the examination linked to the « Energy renovation tradesperson » training: it concretely authorises the tradesperson to submit Klimabonus applications on behalf of clients for individual renovation measures. Both are obtained simultaneously through the same training, but have slightly different scopes.
Can I benefit from the Klimabonus if my tradesperson is not a Klima-Agence certified artisan?
Yes, but with additional administrative complexity. For a comprehensive renovation project, you will be required to go through a Klima-Agence approved energy advisor to prepare your subsidy application file — representing additional cost and delay. For individual measures (windows, façade insulation, loft insulation), only a « Klima-Agence certified artisan » can submit the application directly. Without this qualification, you will need to engage an energy advisor even for simple works.
Can a Belgian, French or German company legally work in Luxembourg?
Yes, companies from the European Economic Area can carry out occasional and temporary service provision in Luxembourg without a permanent establishment authorisation — provided their activity genuinely remains temporary. However, if a company regularly works in the Grand Duchy, it is required to hold an establishment authorisation. To be eligible for the Klimabonus, the company must hold the Klima-Agence certified artisan qualification regardless of its nationality. In practice, always verify documents before signing.
How do I find a « Nohalteg an d’Zukunft + » labelled tradesperson near me?
The Luxembourg Chamber of Skilled Trades offers an online search tool on its website (cdm.lu) allowing you to search for labelled tradespeople by region and trade. Renov.lu also has a network of certified partner tradespeople across Luxembourg, which you can contact directly via our quote request form.
Does the 3% VAT rate apply to all energy renovation works?
The super-reduced 3% VAT rate applies to renovation works on residential properties over 2 years old. It covers virtually all insulation works, heating replacement and joinery. Certain exclusions may apply for specific equipment — your tradesperson or accountant can advise on the exact limits. In case of doubt, the Registration, Domains and VAT Administration (AED) is the competent authority.
Is an energy audit mandatory before my works?
For a partial renovation (individual measure such as window replacement or loft insulation), a full audit is not always mandatory to access grants. However, for a comprehensive renovation involving the Klimabonus across multiple work items, an energy passport before and after works is generally required. The audit cost (€475 to €600) is partially covered by a state subsidy of up to €1,500. It is recommended in all cases to optimise your renovation plan.
How long should I allow between requesting quotes and the start of works?
Timelines vary depending on the nature of the project and company order books. In 2026, certified energy renovation tradespeople in Luxembourg are in high demand. Generally allow: 2 to 4 weeks to receive your quotes, then 4 to 12 weeks to obtain the Klima-Agence in-principle agreement, then 4 to 16 weeks before works start depending on company availability. For summer projects, begin your process the previous winter.
Take action — simulate your grants and request quotes
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