In Luxembourg, you can access up to €46,000 in subsidies to renovate your home through the 2025 Klimabonus programme. It’s the largest energy efficiency support package ever offered—but only if you know how to use it correctly.
This guide explains every available euro, how to access it, and how to combine grants to maximise your renovation budget.
How much can you get from Klimabonus 2025?
Klimabonus is structured in two pillars: renovation grants and replacement bonuses.
| Work Type | Grant Amount | Replacement Bonus | Maximum |
|---|---|---|---|
| Heat pump (PAC) | 50% up to €8,000 | +50% if replaces heating oil/gas | €12,000 |
| Hybrid boiler | 50% up to €4,000 | +20% if replaces oil/gas | €4,800 |
| Roof insulation | 30% up to €1,500 | - | €1,500 |
| Wall insulation | 30% up to €6,000 | - | €6,000 |
| Ground insulation | 30% up to €1,500 | - | €1,500 |
| Windows (triple glazing) | 30% up to €3,000 | - | €3,000 |
| Ventilation/heat recovery | 30% up to €1,500 | - | €1,500 |
| Solar hot water | 30% up to €2,000 | - | €2,000 |
| Solar panels | 30% up to €5,000 | - | €5,000 |
Maximum per property: €46,000 (with full combination of all categories)
Important: Grants are capped at 50% of total work costs. A heat pump costing €15,000 will receive 50% = €7,500 (limited to the €8,000 cap), nothing more.
Who qualifies for Klimabonus 2025?
You can access Klimabonus if you meet three conditions:
- Owner of the property (owner-occupied or landlord)
- Resident in Luxembourg or cross-border resident with Luxembourg tax obligations
- Property is located in Luxembourg and is over 10 years old (for most work types)
Date exceptions:
- Roof, wall, and ground insulation: building over 5 years old (not 10)
- Comprehensive energy renovations: no age limit
No income limits: Unlike some countries, Luxembourg has no income caps for Klimabonus. Even high-earning homeowners qualify. (See Topup Social below if you’re on a modest income.)
How to apply for Klimabonus: The MyGuichet procedure
Applications are made entirely online via MyGuichet.lu. Here’s the exact process:
Before you start: What you’ll need
- MyGuichet account (create one at MyGuichet.lu if needed)
- Detailed quotation from your contractor (with unit prices, materials, labour)
- Compliance certificate or energy performance attestation (depending on work)
- Proof of ownership (property title or lease copy)
- Bank account number (to receive the grant)
- Invoice after completion (for final payment)
Application steps
Step 1: Create your MyGuichet.lu account Go to MyGuichet.lu, click “Create account”, verify your email.
Step 2: Log in and navigate to Klimabonus Menu > Environment and Sustainable Development > Klimabonus
Step 3: Select work type Choose from 9 categories (heat pump, insulation, windows, etc.). You can declare multiple work items in a single application.
Step 4: Complete the detailed form
- Precise description of works
- Surface area affected (in m²)
- Quotation amount excluding VAT
- Contractor details (name, business registration number)
- Planned start date
Step 5: Upload supporting documents
- Contractor quotation (PDF)
- Technical certificates (as required)
- Proof of ownership
Step 6: Declare Topup Social eligibility (Net household income under €120,000 for single-family homes)
Step 7: Submit your application You’ll receive a file reference number. Keep it safe.
Processing timescales
- Acknowledgement of receipt: 5 working days
- Pre-approval: 10-15 days (preliminary decision)
- Start work: You can begin as soon as pre-approval (before final approval)
- Final approval: After invoice submission (10 days)
- Payment: 15-30 days after final approval
Important: You must have at least pre-approval before signing with a contractor.
Costly mistakes to avoid
❌ Mistake 1: Starting work before pre-approval No grant will be paid if work commenced before approval.
❌ Mistake 2: Forgetting to apply for Topup Social if eligible This can double your grants (up to €92,000 for eligible households).
❌ Mistake 3: Submitting vague quotations Quotations must detail: work description, quantities, unit prices, material brands/references. Generic quotations will be rejected.
❌ Mistake 4: Missing the 36-month deadline You have 3 years to complete work from approval. Beyond that, the grant expires.
❌ Mistake 5: Forgetting that 50% minimum must be energy-related work You cannot fund 100% non-energy work (painting, flooring, general electrics). At minimum 50% must improve energy performance.
Combining Klimabonus with other Luxembourg grants
You CAN combine Klimabonus with:
✅ Enoprimes (supplementary energy ministry grants) ✅ Topup Social (bonus for modest-income households) ✅ Municipal grants (many communes offer additional 5-10%) ✅ Reduced VAT 3% (for properties over 20 years old, if conditions met) ✅ Climate loan (1.5% via Banque de Luxembourg)
You CANNOT combine: ❌ Two Klimabonus applications for the same work ❌ Luxembourg grants + French grants (for cross-border properties)
Example of optimal grant combination for comprehensive renovation
Situation: 1985 house, heat pump + wall insulation + windows, total cost €45,000
| Grant | Amount | Details |
|---|---|---|
| Klimabonus heat pump (50%) | €8,000 | +50% replacement bonus = €12,000 |
| Klimabonus wall insulation (30%) | €6,000 | Capped at €6,000 |
| Klimabonus windows (30%) | €3,000 | Capped at €3,000 |
| Klimabonus subtotal | €21,000 | - |
| Enoprimes (10% additional) | €2,500 | On insulation elements |
| Topup Social (×2 if eligible) | €23,000 | Doubles grants if income-eligible |
| Municipal grant | €1,000 | Varies by commune |
| VAT savings 3% (vs 17%) | €6,300 | Total saved on VAT |
| Total possible grants | €53,800 | €45,000 renovation 120% funded |
This shows why careful grant planning is essential.
Topup Social: Double your grants if eligible
Topup Social Klimabonus is an underutilised bonus that doubles grant amounts for modest-income households.
Topup Social eligibility
Household net annual income:
- Single-family home: under €120,000
- Flat/apartment: under €90,000
- Couples: amounts + €40,000 per additional person
Topup Social amounts
If eligible, each Klimabonus grant is multiplied by 2:
- Heat pump: €12,000 becomes €24,000
- Wall insulation: €6,000 becomes €12,000
- Windows: €3,000 becomes €6,000
- Maximum possible: €92,000
How to access Topup Social: When MyGuichet asks “Are you eligible for Topup Social?”, tick YES if your income is below the threshold. No initial documentation required—the State will verify via tax records.
Common Klimabonus questions
Q: Can I get Klimabonus for a rental property? A: Yes, landlords are eligible. However: if declared as rental accommodation, grant amounts are 50% lower than for owner-occupied homes. Short-term rental may be better if possible.
Q: I already received Klimabonus in 2024 for different work. Can I apply again? A: Yes, no problem. You can apply for other work categories (insulation, windows, etc.). No annual limit, except the global €46,000 cap per property.
Q: My contractor refuses to provide a detailed quotation, says it’s “too much paperwork” A: Change contractors. This requirement is non-negotiable for Klimabonus. Experienced Luxembourg contractors understand the procedure.
Q: How long until I receive the money? A: Approximately 45-60 days between final submission and payment, if complete application. Expect 3-4 months total from pre-approval to completion.
Q: Is the grant paid to me or directly to the contractor? A: To you, the homeowner. You pay the contractor, then submit the invoice for reimbursement. This system protects citizens from fraud.
Critical deadline: Insulation grants until December 2025
⚠️ Important alert: Grants for insulation (roof, walls, ground) have a December 2025 deadline for applications. After this date, insulation work will no longer be funded.
If you’re considering insulation, apply before December 2025, even if work starts in 2026.
Heat pump, window, and renewable energy grants have no known deadline currently.
Expert tips to maximise your Klimabonus
1. Plan a “comprehensive energy renovation” This sometimes increases grant rates. Combine heating + insulation rather than insulating alone.
2. Compare several contractors before applying Obtaining 2-3 quotations helps justify pricing to the authority and optimises budget.
3. Verify your contractor knows Klimabonus Ask directly: “Do you have experience with Klimabonus applications?” Good contractors can even help complete the form.
4. Get approval before signing with a contractor This protects you: if you’re not approved, you’re not yet committed.
5. Document everything: quotations, emails, before photos In case of audit, transparency works in your favour.
Conclusion: €46,000 in grants is significant
The 2025 Klimabonus represents a major energy renovation opportunity in Luxembourg. With up to €46,000 available (€92,000 if Topup Social eligible), even expensive renovations become affordable.
Success depends on: preparing your application before starting work, hiring a contractor experienced with grants, and checking Topup Social eligibility.
Ready to transform your home? Find a qualified contractor specialising in energy renovation and launch your Klimabonus project today via tack.lu.
