What subsidies and grants are available for energy renovation in Luxembourg in 2026? Complete guide
Klimabonus, Enoprimes, municipal subsidies, 3% VAT, Klimaprêt… In Luxembourg, energy renovation financing schemes are numerous and generous. In 2026, the Klimabonus Wunnen scheme has been entirely renewed: simplified flat-rate amounts, enhanced ecological bonuses, invoicing window extended to 2035. Intelligently combined, these subsidies can cover from 30% to more than 60% of your total works cost. This guide lists all schemes, their exact amounts and the conditions to respect to miss nothing.
Estimate your 2026 subsidies in a few minutes with our simulator.
Simulate my 2026 subsidies →Overview of available subsidies in 2026
In Luxembourg, energy renovation of a home can draw on five distinct and cumulative financing sources. Each follows its own logic — direct capital grant, tax reduction, interest subsidy — but all can be mobilised simultaneously on the same project. Here is their overall logic before detailing each one.
| Scheme | Who pays? | Nature | Indicative ceiling |
|---|---|---|---|
| Klimabonus Wunnen | Luxembourg State (AEV) | Direct capital grant | Up to 62.5% of eligible costs |
| Enoprimes | Enovos / SUDenergie | Complementary premium | Variable depending on energy savings |
| Municipal subsidies | Your municipality | Direct capital grant | 10% to 50% of state subsidy |
| 3% VAT | Tax administration | VAT reduction (−14 pts) | Max. €50,000 VAT per dwelling |
| Klimaprêt | Approved banks | Interest subsidy (1.5%) | Max. 10% of borrowed capital |
All these schemes are cumulative. The winning strategy is to mobilise them from the preparation phase of your project — not afterwards, when some application windows have already closed. Before signing any quote, start by simulating your total subsidies, then submit your Klimabonus and Enoprimes agreement in principle applications in parallel.
The Klimabonus Wunnen 2026 — the main state subsidy
The Klimabonus Wunnen is the most important state subsidy for energy renovation in Luxembourg. It is managed by the Environment Administration (AEV) and accessible via the housing aid single window or MyGuichet.lu.
In 2026, the scheme is based on a flat-rate logic per building element: each type of works qualifies for a fixed amount expressed in euros per m² or per installation. The more performant and ecological the materials, the higher the amount — a logic that rewards ambitious choices.
The subsidy applies to the renovation of residential buildings located in Luxembourg and more than 10 years old. It covers both single-family homes and apartments in co-ownership, and is addressed to owners as well as co-ownerships through their mandated property manager.
For more detail on specific works: our guide on thermal insulation, heat pumps, or solar panels details amounts by installation type.
What changes with the new Klimabonus 2026 scheme
The previous scheme (RGD 2022) expired on 31 December 2025. A new scheme came into force on 1 January 2026 (with retroactive effect, subject to publication in the Mémorial). The changes are significant and considerably enhance the attractiveness of the subsidies:
Simplified flat-rate amounts
Gone are the complex calculations based on installation capacity. Each type of works now benefits from a fixed amount in €/m² or per installation, according to the performance level achieved and the type of material chosen. This simplification makes calculating your subsidies much more readable and predictable from the quoting phase.
Integration of the former Tripartite bonus into base amounts
The Tripartite premium, previously paid separately, is now directly integrated into the base amounts. Subsidies are thus more readable and net amounts are globally higher than before for the majority of projects.
Removal of the boiler age requirement
For heat pumps and wood boilers, the requirement that the replaced fossil boiler be at least 10 years old has been removed. The replacement bonus is now accessible regardless of the age of your old installation.
Enhanced ecological bonuses for bio-based materials
Natural insulations (wood fibre, cellulose wadding, sheep’s wool…) and materials with non-fossil cladding mechanically fixed benefit from specific supplements. This bonus can represent up to double the subsidy amount compared to synthetic materials.
New subsidies for green facades and living roofs
An unprecedented subsidy category rewards green facades and living roofs, encouraging urban biodiversity and rainwater management on renovated buildings.
Invoicing window extended to 2035
Works with invoices dated between 1 January 2026 and 31 December 2035 are eligible. The first agreement in principle application must be submitted before 31 December 2030. You have 4 years after 31 December of the invoicing year to submit your final subsidy application.
Direct pre-financing of photovoltaic subsidies
Since 4 January 2026, Klimabonus subsidies for photovoltaics are deducted directly from the installer’s invoice. You only pay the net balance — without advancing then waiting for reimbursement.
In June 2026, the law establishing the new 2026 Klimabonus scheme was still in legislative procedure (bill 8585). Applications can already be submitted with retroactive effect from 1 January 2026, but final processing is subject to publication in the Mémorial. Consult guichet.public.lu to follow progress.
Klimabonus 2026 amounts by type of works
The amounts below come from the Klimabonus 2026 scheme as communicated by the Luxembourg government and Klima-Agence. They are given as indicative figures — the definitive amounts will be those published in the Mémorial.
Thermal insulation of the building envelope
The Klimabonus distinguishes two performance levels for each element of the thermal envelope, and two material categories (standard vs ecological). The more performant and bio-based the material, the higher the subsidy. For insulation materials, see our insulation comparison.
| Type of works | Standard material | Ecological material |
|---|---|---|
| External wall insulation — performance level I | €60/m² | €115/m² |
| External wall insulation — performance level II (enhanced) | Increased | Increased |
| Roof / converted loft insulation | Up to ~€87.5/m² | Up to ~€111.25/m² |
| Lost loft / attic floor insulation | Flat rate | 62.5% of capped actual costs |
| Ground floor / crawl space insulation | Flat rate | Increased flat rate |
| Window replacement | €70/m² of replaced glazing area | |
Since 2026, fossil-origin insulations are only subsidised if they contain more than 50% recycled materials. By opting for bio-based materials (wood fibre, cork, cellulose wadding), you can nearly double the Klimabonus amount on insulation items. On a 200 m² facade, the difference between €60/m² and €115/m² represents €11,000 in additional subsidy.
Technical installations (heating, ventilation, photovoltaics)
| Installation type | Klimabonus subsidy 2026 | Particular conditions |
|---|---|---|
| Air/water heat pump | Fixed flat-rate amount | Enhanced bonus if replacing a fossil boiler |
| Geothermal heat pump | Fixed flat-rate amount (higher) | Same |
| Wood pellet boiler | Fixed flat-rate amount | Bonus if replacing fossil boiler |
| District heating network connection | Up to 50% of actual costs | Invoice before 31 Dec. 2030 (or 2035 if combined with renovation) |
| Double-flow MVH | Flat rate per dwelling | % of ventilated SRE area — see detailed AEV conditions |
| Photovoltaic panels | Up to €10,000 (max. 15 kWp) | Direct pre-financing from 4 Jan. 2026 — invoice before 31 Dec. 2029 |
| Storage battery | Up to €2,250 (max. 9 kWh) | Coupled with a PV installation ≥ 2 kWp |
| Energy management system (HEMS) | New — applicable from Oct. 2026 | Invoice from 1 October 2026 |
For technical installations carried out jointly with an energy renovation, invoicing deadlines are extended to 31 December 2035. For details on heat pump subsidies, consult our page on heat pump subsidies in Luxembourg.
Enoprimes — the energy supplier premium
In addition to the Klimabonus, Luxembourg energy suppliers have been required since 2015 to finance energy savings for their customers. The Enoprimes programme (managed by Enovos and SUDenergie) is the main such scheme in the Grand Duchy.
Enoprimes is a complementary and cumulative subsidy alongside the Klimabonus. It applies to most energy efficiency works: thermal insulation, heating system replacement, mechanical ventilation, thermodynamic water heater, etc. The amount depends on the energy savings generated by the works. On the most common insulation works, Enoprimes can add a supplement of around €10 to €15/m² on top of the Klimabonus.
Key points on Enoprimes
Mandatory prior agreement before signing quotes
You must imperatively request Enovos’s agreement in principle before accepting quotes and committing expenditure. This is the most frequently forgotten rule — and the most costly when neglected.
Accessible to all, even if not an Enovos customer
You do not need to be an Enovos customer to benefit from Enoprimes. The programme is open to any owner or tenant of a property in Luxembourg, regardless of your electricity or gas supplier.
Partner tradespeople: zero paperwork for you
By choosing an Enoprimes partner tradesperson, you do not need to handle administrative procedures. The tradesperson does it for you and deducts the premium directly from their invoice in some cases.
Fast payment timeline
Once the complete file is submitted after works, Enoprimes pays the premium generally within 4 weeks. To find out the exact amount, use the simulator at enoprimes.lu.
Municipal subsidies — an often underestimated supplement
Many Luxembourg municipalities offer complementary subsidies to national energy renovation programmes. These subsidies vary greatly from one municipality to another and are entirely cumulative with the Klimabonus and Enoprimes. In general, municipal subsidies take the form of a percentage of the state subsidy, ranging from 10% to 50% of the state aid.
Some examples of municipalities with active subsidies
| Municipality | Type of subsidy | Indicative amount |
|---|---|---|
| Luxembourg City | Insulation, heat pump, PV subsidy | Variable — Klima-Agence simulator |
| Lintgen | 50% of state subsidy | Cap €1,500 |
| Bertrange | 25% of state subsidy — energy renovation | Cap €1,800 per house |
| Differdange | 40% of the subsidy granted by the state | Variable |
| Rambrouch | Up to 50% of state subsidy for certain solar installations | Variable |
| Esch-sur-Alzette, Pétange… | Various subsidies according to municipal regulations | To be verified locally |
Some municipalities have no dedicated scheme. Always enquire with your municipal administration before starting your project. Municipal subsidies can often be simulated via the Klima-Agence simulator, which integrates known municipal amounts updated regularly.
3% VAT — the silent subsidy that carries weight
Often overlooked in calculations, the super-reduced 3% VAT on renovation works is nevertheless a considerable benefit. It saves you 14 VAT points compared to the standard rate of 17%, on all eligible works. For a renovation project of €150,000 excl. VAT, this represents a saving of €21,000.
The 3% VAT is applied automatically on the invoices of certified tradespeople for renovation works on a dwelling in Luxembourg. You have no specific procedure to follow: the tradesperson applies it directly on their invoice. For more details, consult our complete guide on 3% VAT for renovation works in Luxembourg.
3% VAT eligibility conditions
The dwelling must have been completed at least 2 years ago (and ideally more than 10 years for energy works)
Works must be carried out by a tradesperson registered in Luxembourg
The building must serve residential use
Each dwelling has a maximum envelope of €50,000 of recoverable VAT — check your balance if you have already carried out prior works
The ceiling for eligible works is €357,000 per dwelling
The 3% VAT also applies to interior renovation works (kitchen, bathroom, floor coverings…), not only energy works. If you combine energy renovation and interior renovation, check the status of your overall VAT envelope before planning your successive projects.
Klimaprêt — financing the remaining cost at a reduced rate
Even with an optimal combination of subsidies, an energy renovation represents a significant investment. The Klimaprêt (climate loan) is designed to finance the remaining cost on advantageous terms, in addition to the grants.
The Luxembourg State covers an interest subsidy of 1.5% on the climate loan taken out with an approved bank. The maximum loan amount considered is €100,000, over a maximum duration of 15 years. The total interest subsidy is capped at 10% of the borrowed capital.
In addition, the State may grant a loan guarantee of up to 30% of the project cost (under certain income conditions), with a cap of €50,000 for purely energy projects. For all financing details, consult our complete guide on the Klimaprêt and energy renovation financing.
The Klimaprêt must be taken out with a bank approved by the Luxembourg State (BCEE, BGL BNP Paribas, Spuerkeess…) on presentation of the Klimabonus agreement in principle. Do not take out a standard loan if you wish to benefit from the subsidised rate — this would be a permanently lost saving opportunity.
Klimabonus 2026 eligibility conditions
To benefit from Klimabonus subsidies, your project must meet all the following conditions. A single unmet criterion can invalidate your file for the works concerned.
Building over 10 years old
The dwelling must have been built more than 10 years ago, calculated from the building permit date. New constructions are not eligible for the renovation Klimabonus.
Dwelling located in Luxembourg
The subsidy only applies to residential buildings established on the territory of the Grand Duchy of Luxembourg.
Being the property owner
Only the owner can submit the subsidy application. In case of change of ownership between the agreement in principle and the works, a waiver agreement between old and new owner (form CEDPROP-2026) is required.
Residential use mandatory
The dwelling must serve as a main residence — for the owner or a tenant. Secondary residences and seasonally rented properties are not eligible.
Works carried out by an approved professional
Works must be executed by an approved company registered with the Chambre des Métiers, or be accompanied by a certified energy advisor. Self-construction is not eligible.
Mandatory prior agreement in principle
You must obtain the housing aid single window’s agreement in principle before starting works. No subsidy is granted retroactively for works started before this agreement.
Invoices within the eligible window
Invoices must be dated between 1 January 2026 and 31 December 2035 (or 2030 for standalone technical installations not combined with envelope renovation).
Subsidy application within the deadline
You have 4 years after 31 December of the invoicing year to submit your final liquidation application on MyGuichet.lu.
Special case: co-ownership apartments
For an apartment, works on the external envelope (facade, roof) fall under the co-ownership. A general meeting decision by the co-owners must authorise the works. Minutes or a proxy from each co-owner (form COLL-2026) is required in the application file.
Energy advisory: mandatory from two elements renovated
If you wish to renovate more than one element, you must imperatively go through an energy advisory by an accredited advisor. This advisory is partially subsidised at €400 to €1,500. For a single element, a simplified procedure without energy advisory is possible.
Step-by-step administrative procedure
Here is the path to follow to obtain all your subsidies. The order of steps is mandatory: some windows close permanently if you reverse or skip them.
Estimate your subsidies online
Start with a global estimate of the subsidies you may claim. Use the Renov.lu simulator or that of Klima-Agence.
Contact a certified professional for a quote
A partner tradesperson will precisely quote your project, guide you on materials eligible for the best subsidies and can handle administrative procedures.
Have an energy advisory done (if multi-element)
For any project covering more than one renovation element, an accredited energy advisor assesses your property’s current performance and writes the report required for the agreement in principle.
Obtain the agreement in principle — form DEPA-2026 on MyGuichet.lu
Submit form DEPA-2026 on MyGuichet.lu with the required annexes. Do not start any works before receiving this agreement.
Simultaneously request your Enoprimes and municipal subsidy agreements
These applications must also be submitted before works begin. Do them in parallel with your Klimabonus application to save time.
Carry out works with your approved company
Keep all documents: detailed invoices, commissioning certificates, compliance reports. The company must submit a reception application to the Chambre des métiers within the month following commissioning of technical installations.
Submit your final liquidation application
After works, submit your complete file on MyGuichet.lu within 4 years of 31 December of the invoicing year. Subsidies are transferred directly to your bank account.
No subsidy is granted retroactively for works started before the agreement in principle. This rule is absolute, with no exception and no recourse. It is by far the most costly mistake in this type of project.
For a complete step-by-step procedures guide, consult our page on steps and procedures for energy renovation in Luxembourg.
Example of combined subsidies on a real project
To concretely illustrate the combination mechanics, here is a detailed example for a 150 m² 1980s single-family home in Luxembourg, combining facade insulation with ecological material, triple glazing window replacement and installation of an air/water heat pump replacing a fuel oil boiler.
| Works item | Estimated cost inc. VAT | Klimabonus | Enoprimes | Municipal subsidy |
|---|---|---|---|---|
| Facade insulation (3 faces, 220 m²) — ecological material | ~€46,000 | ~€25,300 | ~€2,200 | Variable |
| Triple glazing window replacement (28 m² of glazing) | ~€18,000 | ~€1,960 | ~€560 | Variable |
| Air/water heat pump (replacing fuel oil boiler) | ~€22,000 | Flat rate + replacement bonus | ~€1,500 | Variable |
| Energy advisory | ~€1,800 | ~€400–€500 | — | — |
| Total project | ~€87,800 | Estimated combined subsidies: €30,000 to €42,000 depending on municipality and materials | ||
With 3% VAT (saving of ~€12,300 on this project vs 17% VAT), the effective remaining cost can drop to €35,000–€50,000, representing total coverage of around 40 to 55% of the project. And this, without counting annual energy savings of €1,200 to €1,800 or the estimated property value increase of €15,000–€20,000 thanks to the improvement of the property’s energy class.
Amounts depend on actual surfaces, chosen materials, performance level achieved and municipality. For a personalised estimate integrating all schemes, use our simulator or request a quote from a partner tradesperson.
Calculate your subsidies and get a free quote
Estimate in 2 minutes the total amount of subsidies you are entitled to, then compare multiple free quotes from certified tradespeople in Luxembourg.
Mistakes to absolutely avoid
Starting works before the agreement in principle
The most costly and most frequent mistake. Without prior agreement in principle from the single window, you lose all rights to Klimabonus subsidies for these works. No exception, no recourse possible.
Forgetting to request Enoprimes before works begin
As with the Klimabonus, the Enoprimes agreement application must be submitted before accepting quotes. One oversight and this subsidy is lost for the project concerned.
Choosing a non-approved tradesperson
Only works carried out by approved companies or accompanied by a certified energy advisor are eligible. Verify your tradesperson’s status before signing.
Not checking your 3% VAT envelope
Each dwelling has a maximum envelope of €50,000 of recoverable VAT. If you have already carried out prior works at reduced VAT, check the available balance with the Tax Administration.
Choosing materials not eligible for ecological bonuses
Polyurethane and fossil insulations without recycled materials are no longer subsidised (or at very reduced rates) in 2026. By opting for bio-based materials, you can double the Klimabonus amount on insulation items.
Forgetting municipal subsidies
Many owners are unaware that their municipality offers complementary subsidies sometimes representing 30 to 50% of the state subsidy. Always enquire with your municipal administration before launching the project.
Frequently asked questions about renovation subsidies in Luxembourg
What subsidies are available for energy renovation in Luxembourg in 2026?
In 2026, five main cumulative schemes are available: Klimabonus Wunnen (state subsidy that can finance up to 62.5% of eligible works), Enoprimes (complementary energy supplier premium), municipal subsidies (variable by municipality, 10% to 50% of state aid), the super-reduced 3% VAT on works, and the Klimaprêt (subsidised rate loan). All these schemes are maintained and even enhanced in 2026.
How to obtain the Klimabonus 2026 — what are the steps?
To obtain the Klimabonus, you must: (1) have an energy advisory done by an accredited advisor if you are renovating several elements, (2) submit form DEPA-2026 on MyGuichet.lu to obtain an agreement in principle from the housing aid single window, (3) carry out works through an approved company, and (4) submit your final liquidation application within 4 years of the invoice date. The agreement in principle must imperatively be obtained before works begin.
What subsidy amount can I obtain for a full renovation?
For a full renovation (facade + roof insulation + window replacement + heat pump), the combination of Klimabonus + Enoprimes + municipal subsidies + 3% VAT can represent 35% to 55% of the total project cost. For a typical 150 m² home, this can correspond to €35,000 to €50,000 in subsidies. Exact amounts depend on surfaces, chosen materials, performance level achieved and municipality.
What is new with the Klimabonus in 2026 compared to 2025?
The 2026 scheme brings several important changes: (1) fixed flat-rate amounts per type of works, more readable; (2) integration of the former Tripartite bonus into base amounts; (3) removal of the 10-year age requirement for replaced boilers; (4) new bonuses for ecological materials and green facades; (5) invoicing window extended to 2035; (6) direct pre-financing of photovoltaic subsidies from 4 January 2026.
Can you combine Klimabonus and Enoprimes?
Yes, Enoprimes are entirely cumulative with the Klimabonus, municipal subsidies and other grants. Enoprimes can add a supplement of around €10 to €15/m² on the most common insulation works, in addition to the Klimabonus.
Who can benefit from energy renovation subsidies in Luxembourg?
Any person owning a dwelling over 10 years old located in Luxembourg can claim Klimabonus subsidies. The dwelling must serve as a main residence (for the owner or a tenant). Secondary residences are not eligible. For co-ownership apartments, works on common parts require the general meeting’s agreement.
What is the energy advisory and is it really mandatory?
The energy advisory is mandatory if you wish to renovate more than one building element. It must be carried out by an energy advisor accredited by the Luxembourg State. This advisory is partially subsidised (€400 for quote compliance verification, €500 for on-site implementation control). If you renovate only one element, a simplified procedure without energy advisory is possible.
How does the 3% VAT work for renovation works?
The super-reduced 3% VAT is automatically applied on certified tradesperson invoices for residential renovation works in Luxembourg. You have no specific procedure to follow: the tradesperson applies it directly. Each dwelling has a maximum envelope of €50,000 of recoverable VAT, within the limit of €357,000 of works.
What are the deadlines to respect for the Klimabonus 2026?
The key deadlines are: (1) the first agreement in principle application must be submitted before 31 December 2030; (2) works invoices must be dated between 1 January 2026 and 31 December 2035 (2030 for standalone technical installations); (3) the final liquidation application must be submitted within 4 years of 31 December of the invoicing year.
Does my municipality offer complementary subsidies?
It depends on your municipality. Some offer very advantageous subsidies representing up to 50% of the state subsidy. Others have no dedicated scheme. To find out, contact your municipal administration directly or use the Klima-Agence subsidy simulator. This check should be done before works begin.
Are subsidies taxable as income?
No. Klimabonus grants are not considered taxable income for individuals and do not need to be declared in tax returns. If you are a landlord and wish to verify the specific tax implications for your situation, it is advisable to consult an accredited tax advisor.
Take action — simulate your subsidies and request a quote
Use our simulator to precisely know your 2026 subsidies, then contact a certified tradesperson in Luxembourg to quote your project. Our partners handle all administrative procedures for you.