Luxembourg offers one of the most generous energy renovation aid systems in Europe. In 2026, by combining Klimabonus, 3% VAT, the social topup and municipal grants, you can cover up to 60-70% of the cost of your works. This guide covers every scheme currently in force and points you to our detailed guides for each one.
New: estimate your aid in 30 seconds. Our renovation aid calculator computes your Klimabonus, bonuses and 3% VAT saving from the 2026 scales.
The aid landscape in 2026: what you need to know
The system has been deeply simplified in recent years. The old grants (notably PRIMe House) have been replaced and unified into the Klimabonus, the State’s flagship programme. Since 2025, the housing grant has also been integrated into it: a single file on guichet.lu is now enough.
Here are the schemes you can combine in 2026:
| Aid | What it is | Typical amount |
|---|---|---|
| Klimabonus | The State’s aid programme for energy renovation | Up to €12,000 per item, up to €46,000 in total |
| Klimabonus topup | Income-based increase | +25% to +100% of the base aid |
| 3% VAT | Super-reduced VAT instead of 17% on works | Up to €7,000 saved on €50,000 of works |
| Zero-interest climate loan | SNCI loan to finance the remaining cost | Up to €100,000 |
| Enoprimes | Energy supplier bonuses | +10-20% on certain items |
| Municipal grants | Top-ups varying by municipality | €500 to €5,000 |
Let’s go through each scheme.
The Klimabonus: the pillar of the system
The Klimabonus is the Luxembourg State’s central financial aid programme for energy renovation. It covers insulation, heating, ventilation and renewable energy. All official information is published by Klima-Agence, the national climate and energy agency (formerly myenergy).
The 2026 amounts at a glance
| Works | Base amount | Performance bonus |
|---|---|---|
| Wall insulation (external) | €80/m² | +€20/m² if U ≤ 0.15 |
| Roof insulation | €60/m² | +€15/m² if U ≤ 0.12 |
| Floor insulation | €50/m² | +€10/m² if U ≤ 0.20 |
| Triple-glazed windows | €150/m² | +€50/m² if Uw ≤ 0.8 |
| Air-water heat pump | €8,000 | +€4,000 if COP ≥ 4.5 |
| Geothermal heat pump | €12,000 | +€3,000 if COP ≥ 5 |
| Pellet boiler | €6,000 | +€2,000 if efficiency ≥ 95% |
| Dual-flow ventilation (MVHR) | €3,000 | +€1,000 if efficiency ≥ 85% |
On top of that come a 15% bonus for global renovation (at least 3 different types of works within 24 months) and a 25% social increase for households on modest incomes.
Important: Oil and gas boilers have no longer been eligible for aid since 2025. The declaration of intent on guichet.lu is mandatory before starting the works.
For detailed eligibility conditions, the step-by-step procedure and the full FAQ, see our complete Klimabonus 2026 guide →
The topup: up to double your aid depending on your income
The Klimabonus topup is an automatic increase of the base aid, granted under income conditions. It can raise your aid by 25% to 100%.
The thresholds published in 2025 (to be confirmed for 2026): for a single person, a 100% topup up to €40,000 of annual taxable income, and 50% between €40,000 and €55,000. For a couple, 100% up to €65,000 and 50% from €65,000 to €90,000. The thresholds are raised by €10,000 per dependent child.
The calculation is automatic when your application is processed on guichet.lu — no additional step required. Note: the topup is reserved for owner-occupiers.
Everything about the Klimabonus topup →
The 3% VAT: the most underestimated aid
Unlike the Klimabonus, the super-reduced VAT requires no administrative application: it applies directly on the tradesperson’s invoice, at 3% instead of 17%.
| Works budget | VAT at 17% | VAT at 3% | Savings |
|---|---|---|---|
| €10,000 | €1,700 | €300 | €1,400 |
| €30,000 | €5,100 | €900 | €4,200 |
| €50,000 | €8,500 | €1,500 | €7,000 |
| €100,000 | €17,000 | €3,000 | €14,000 |
The two main conditions: a dwelling more than 20 years old and works carried out by a professional. The cap is €50,000 of works per calendar year; beyond that, VAT reverts to 17% on the excess.
The good news: the 3% VAT can be combined with the Klimabonus on the same works. On a heat pump + insulation project of €22,000 excluding VAT, combining the two can cut the real cost by more than half.
Conditions, eligible works and pitfalls to avoid: our 3% VAT guide →
The housing grant: now integrated into the Klimabonus
Since 2025, the housing grant is no longer managed separately: it is integrated into the Klimabonus programme. Concretely, a single file on guichet.lu covers both energy renovation and other home improvements, with centralised calculation and payment. The eligibility criteria and amounts remain unchanged — only the procedure has been simplified.
What the housing grant + Klimabonus merger changes →
The zero-interest climate loan
To finance the remaining cost, the SNCI (Société Nationale de Crédit et d’Investissement) offers a zero-interest loan of up to €100,000 for energy renovation works. This loan can be combined with the Klimabonus. Practical information is available on guichet.public.lu.
Enoprimes and municipal grants: the often-forgotten top-ups
Enoprimes: energy suppliers offer additional bonuses on certain items (insulation, heat pump), typically representing an extra 10 to 20%. Check with your supplier.
Municipal grants: many municipalities offer top-ups of €500 to €5,000 depending on the works. It’s easy money — but you have to actively apply for it. Ask your municipal administration, ideally before signing your quotes.
How much can you save in total?
By correctly combining all the aid, the impact is spectacular. A concrete example taken from our combining guide: a complete renovation budgeted at €80,000 (heat pump + insulation + windows + painting) on a 1985 house.
| Aid applied | Amount |
|---|---|
| Initial cost | €80,000 |
| 3% VAT saved | -€8,400 |
| Klimabonus | -€17,000 |
| Social topup (if eligible) | -€17,000 |
| Enoprimes | -€2,500 |
| Municipal grant | -€1,500 |
| Final real cost | €33,600 |
That is 58% savings on the initial budget. The order of application matters: 3% VAT from the quote stage, Klimabonus pre-approval before works start (allow 10-15 days), Enoprimes and municipality afterwards.
The complete strategy for combining grants →
The mistakes that cost dearly
- Starting works before the declaration on guichet.lu: no Klimabonus aid will be paid. It’s the most frequent and most expensive mistake.
- Choosing a non-certified tradesperson: only works carried out by certified professionals are eligible.
- Forgetting the 3% VAT at quote stage: an invoice issued at 17% cannot be corrected retroactively.
- Ignoring municipal grants: several hundred to several thousand euros lost, for lack of filing a simple application.
- Not keeping the supporting documents: invoices, certificates and photos must be kept (10 years for the Klimabonus).
Where to start?
- Check the age of your dwelling: more than 10 years for the Klimabonus, more than 20 years for the 3% VAT.
- Get an energy performance certificate (EPC) or an energy audit to identify the priority works.
- Request several quotes from certified tradespeople, mentioning the 3% VAT and the Klimabonus from the outset.
- Declare your project on guichet.lu before the works, then wait for pre-approval.
- After the works, submit invoices and certificates within 12 months for payment.
For any question about your eligibility, Klima-Agence offers free guidance and a subsidy simulator.
Find your tradespeople on Tack
A tradesperson who knows the Klimabonus requirements and invoices the 3% VAT correctly is your guarantee of not losing any aid. On Tack, describe your project and receive up to 3 free quotes from verified tradespeople in Luxembourg.
FAQ
What is the most important aid in 2026?
The Klimabonus remains the central scheme, with amounts of up to €12,000 for a geothermal heat pump and up to €46,000 in total. Combined with the topup and the 3% VAT, it can cover the majority of the cost of the works.
Can the different aids be combined?
Yes. Klimabonus, topup, 3% VAT, climate loan, Enoprimes and municipal grants can all be combined on the same project. The only exceptions: two Klimabonus applications for the same works, or combining with foreign aid schemes.
Does PRIMe House still exist?
No. The old grants have been replaced and unified into the Klimabonus, which is today the State’s single programme for energy renovation.
Do I have to use a certified professional?
Yes, it is a Klimabonus eligibility condition. Self-build works are not eligible, with the exception of loft insulation under certain conditions.
Where do I apply?
All applications (Klimabonus + integrated housing grant) are made on guichet.lu, with a single file since 2025. The 3% VAT, on the other hand, applies directly on the invoice, without any application.
