Window Replacement Cost in Luxembourg (2026): Prices, Materials and Grants
By Yacine Sahnoune, founder of renov.lu
In Luxembourg, replacing your windows costs between €500 and €2,400 per opening, installation included, depending on the type (standard window, French door or sliding patio door), the frame material (PVC/uPVC, aluminium or timber) and the glazing (double or triple). By combining the Klimabonus 2026 (€70/m² of window replaced, or €80/m² if the approval in principle is requested by 30 June 2027), Enoprimes, the 3% VAT rate and municipal grants, you can cut the net cost by 15 to 25%. Below you will find all the verified prices and the grants available to plan your new windows project in 2026.
- Standard PVC window: €500–650 with double glazing and €750–900 with triple glazing, installation included, in Luxembourg (window of about 1.23 × 1.48 m).
- Whole house: allow €7,500–9,000 for 10 triple-glazed PVC windows installed, and €9,500–12,000 for 10 triple-glazed aluminium windows.
- Klimabonus 2026: €70/m² of window replaced (external dimensions), €80/m² if the approval in principle is requested by 30 June 2027, i.e. about €127 (€146) for a standard window.
- Klimabonus conditions: glazing Ug ≤ 0.6 W/m²K (in practice, triple glazing), an insulated wall (U ≤ 0.85 W/m²K) or mechanical ventilation, a building more than 10 years old and approval in principle before work starts; double glazing receives no grant.
- 3% VAT: instead of 17% for a main residence at least 10 years old, capped at €50,000 of VAT savings per dwelling; on 10 windows at €825 excluding VAT, the saving comes to €1,155.
- Lead times: 4 to 8 weeks of made-to-measure manufacturing and 1 to 2 days of installation; allow 2 to 3 months between signing the quote and completion.
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Simulate my project Free quoteWindow prices in Luxembourg by type — installation included (2026)
The prices below are typical ranges charged by companies working in Luxembourg, installation included, for standard sizes. They reflect the local premium linked to wages and delivery lead times.
Standard window (≈ 1.23 m × 1.48 m)
| Material | Double glazing — installed | Triple glazing — installed | Lifespan |
|---|---|---|---|
| PVC (uPVC) | €500–€650 | €750–€900 | 30–40 years |
| Aluminium | €700–€950 | €950–€1,200 | 40–50 years |
| Timber | €750–€1,100 | €1,000–€1,400 | 40–60 years (with maintenance) |
| Wood-aluminium | €900–€1,300 | €1,200–€1,700 | 40–60 years |
Standard French door (≈ 0.90 m × 2.10 m)
| Material | Double glazing — installed | Triple glazing — installed |
|---|---|---|
| PVC | €800–€1,100 | €1,200–€1,500 |
| Aluminium | €1,000–€1,400 | €1,400–€1,800 |
| Timber / Wood-aluminium | €1,100–€1,600 | €1,500–€2,100 |
Large sliding patio door (≈ 2.40 m × 2.10 m)
| Material | Double glazing — installed | Triple glazing — installed |
|---|---|---|
| PVC | €1,500–€2,000 | €2,100–€2,700 |
| Aluminium | €1,800–€2,400 | €2,400–€3,300 |
Installation costs in detail: renovation vs new build
Installation accounts on average for 20 to 30% of the total price of a window in Luxembourg. Its cost varies widely depending on the fitting method chosen and the conditions on site.
The three installation methods
| Method | Description | Installation cost only | Best for |
|---|---|---|---|
| Overlay fitting (renovation) | New window fixed onto the existing reveal, old outer frame kept in place | €100–€200 / window | Quick replacement, tight budget |
| Full frame removal (renovation) | Old outer frame taken out, masonry made good, new window fitted in the rebate | €200–€400 / window | Maximum thermal performance |
| New-build installation | Window fitted before the walls are finished | €100–€200 / window | New build or major renovation |
Lead times to expect in Luxembourg
Made-to-measure manufacturing takes 4 to 8 weeks depending on the material (PVC: 4–5 weeks; aluminium: 5–7 weeks; timber: 6–8 weeks). The installation itself takes 1 to 2 days for a house with 10 to 12 windows. So allow 2 to 3 months between signing the quote and completion of the work, not counting the Klimabonus administrative processing times.
Budget for a whole house (10–12 windows)
| Configuration | Estimated gross budget (installation included) |
|---|---|
| 10 PVC double-glazed windows | €5,000–€6,500 |
| 10 PVC triple-glazed windows | €7,500–€9,000 |
| 10 aluminium triple-glazed windows | €9,500–€12,000 |
| Mix: 8 windows + 2 French doors, PVC, triple glazing | €8,400–€10,200 |
| Mix: 8 PVC windows + 1 aluminium sliding patio door, double glazing | €5,800–€7,600 |
What affects the price of your windows
For the same performance, one quote can cost up to twice as much as another, depending on the choices made. Here are the six key factors to get right before you sign.
1. Glazing type: the biggest impact
Triple glazing costs 30 to 40% more than modern low-E, argon-filled double glazing. For a house with 10 PVC windows, that means an extra €2,000 to €3,000. However, only triple glazing (Ug ≤ 0.6 W/m²K) qualifies for the Klimabonus 2026 (€70/m², or €80/m² if the approval in principle is requested by 30 June 2027), so the extra cost is partly offset on large glazed areas. For small areas or well-exposed south-facing façades, high-performance double glazing (Uw ≤ 1.0 W/m²K), which receives no Klimabonus, is often still the most cost-effective option.
2. Frame material
PVC is the cheapest and most common option. Aluminium costs 20 to 30% more than PVC for similar thermal performance (provided it has a good-quality thermal break). Timber and wood-aluminium can cost 50 to 100% more than PVC, but have a better carbon footprint (the window Klimabonus, however, remains the same flat rate per m², whatever the frame material).
3. Size and opening type
A non-standard window (extra-wide, arched, dormer) is made to measure and can cost 2 to 5 times the price of a standard window. Tilt-and-turn windows are the most popular and the best priced; sliding windows are slightly cheaper to buy but harder to seal.
4. Built-in options
A motorised roller shutter built into a made-to-measure box adds €300 to €600 per window. Reinforced acoustic glazing (asymmetric laminated glass, e.g. 6/16/4) adds €80 to €150 per m². Security (anti-burglary) glazing, P2A minimum, adds €100 to €200 per window.
5. Number of windows ordered
For orders of more than 10 units placed at the same time, manufacturers generally grant a discount of 5 to 10% on the supply cost. For 20 units or more (apartment buildings, full renovations), the discount can reach 10 to 15%.
6. Condition of the existing masonry
If the window reveals are damaged (cracks, damp, poor insulation), masonry repairs are needed before installation: allow an extra €100 to €300 per window depending on the condition of the walls.
Window replacement grants in Luxembourg in 2026
Five sources of aid can be combined when replacing windows in Luxembourg. Here are the details of each, with verified amounts.
1. Klimabonus 2026 — €70/m² of window replaced (€80/m² until 30 June 2027)
Since 1 January 2026, the new Klimabonus Wunnen scheme (law of 24 July 2026, with retroactive effect) calculates the window replacement grant on the basis of a flat rate of €70/m² of window replaced (€80/m² if the approval in principle is requested by 30 June 2027), provided the glazing achieves Ug ≤ 0.6 W/m²K. This amount now incorporates the former Tripartite bonus.
| Opening type | Window area (external dimensions) | Estimated Klimabonus 2026 grant |
|---|---|---|
| Standard window (1.23 m × 1.48 m) | ≈ 1.82 m² | ≈ €127 (€146 until 30 June 2027) |
| French door (0.90 m × 2.10 m) | ≈ 1.89 m² | ≈ €132 (€151 until 30 June 2027) |
| Sliding patio door (2.40 m × 2.10 m) | ≈ 5.04 m² | ≈ €353 (€403 until 30 June 2027) |
2. Enoprimes — additional grant from your energy supplier
The energy suppliers Enovos and Sudenergie pay additional grants through the Enoprimes programme (you do not need to be their customer) for replacing poorly performing windows with models fitted with high-performance insulating glazing. The amount depends on the measure and on the product’s performance. You must apply before signing the purchase order: any application opened after the order has been placed is automatically rejected.
3. 3% VAT — a direct saving on your invoice
For a main residence in Luxembourg, renovation work (including window replacement) qualifies for the super-reduced VAT rate of 3% instead of 17%, a saving of 14 percentage points on the amount excluding VAT. This tax benefit is capped at €50,000 of VAT savings per dwelling. The dwelling must be used as a main residence and be at least 10 years old. The contractor can apply the 3% rate directly once approved by the AED (the Luxembourg VAT authority); otherwise, the owner can claim a refund afterwards.
10 × €825 × 14% = €1,155 saved on VAT
4. Municipal grants — depending on your commune
Almost all Luxembourg communes top up the Klimabonus. For 20 m² of windows, 82 of the 100 communes add €160 to €1,000 (Klima-Agence simulator, September 2026): commune grant for windows in your commune. Your commune’s regulation applies.
5. Klimaprêt — financing your out-of-pocket cost
If your budget does not cover the full cost of the work, the Klimaprêt lets you borrow up to €100,000 over 15 years from a participating bank, with a State interest subsidy of 1.5% (capped at 10% of the principal, i.e. €10,000 maximum). This loan can be combined with the Klimabonus and Enoprimes.
Net cost after grants: worked examples
The following two examples show in concrete terms how grants affect a Luxembourg homeowner’s budget. Klimabonus amounts are estimates based on the 2026 scheme’s basic flat rate of €70/m² (€80/m² if the approval in principle is requested by 30 June 2027); Enoprimes amounts are indicative and depend on the measure.
Example 1 — 1990s house, 10 PVC triple-glazed windows
| Item | Amount |
|---|---|
| 10 PVC triple-glazed windows, installation included (full frame removal) | €8,250 excl. VAT |
| 3% VAT (instead of 17%) | €247 VAT (instead of €1,402) |
| Total incl. VAT before other grants | €8,497 |
| VAT saving (14 points), already reflected in the VAT-inclusive total | (€1,155, not deducted a second time) |
| Klimabonus 2026 (≈ 1.82 m² × €70 × 10 windows) | − €1,274 |
| Estimated Enoprimes (indicative) | − €200 to €400 |
| Estimated net cost | €6,820–€7,020 |
Example 2 — 1980s house, 8 PVC windows + 1 aluminium double-glazed sliding patio door
| Item | Amount |
|---|---|
| 8 PVC double-glazed windows (installation included) | €4,560 excl. VAT |
| 1 aluminium double-glazed sliding patio door (installation included) | €2,000 excl. VAT |
| Total excl. VAT | €6,560 excl. VAT |
| 3% VAT | €197 VAT |
| VAT saving (14 points), already reflected in the 3% VAT | (€918, not deducted a second time) |
| Klimabonus 2026: not eligible (double glazing, Ug above 0.6 W/m²K) | €0 |
| Estimated Enoprimes (indicative) | − €150 to €300 |
| Estimated net cost | €6,460–€6,610 |
Steps to take before signing your window quote
Timing is critical: a single step taken in the wrong order can cost you all of your grants. Here is the right sequence for replacing windows in Luxembourg in 2026.
Contact Enovos or Sudenergie, which offer Enoprimes (you do not need to be their customer), or go through an enoprimes.lu partner installer. Approval must be obtained before the purchase order is signed, without exception.
Before work starts, submit your application for approval in principle to the Guichet unique des aides au logement (the one-stop shop for housing aid) via MyGuichet.lu. If you are replacing a single element without an energy consultation, the simplified procedure applies. For several elements, a consultation with an approved energy advisor is mandatory.
Ask your municipal administration or use the Klima-Agence simulator (aides.klima-agence.lu) to find out which grants are available in your municipality.
Once you have the Klimabonus approval in principle and the Enoprimes approval, sign the quote from an approved company (or have the work supported by an approved energy advisor). If you need a Klimaprêt, prepare it with a participating bank: the State guarantee requires the Klimabonus approval in principle, and the interest subsidy (form F3) requires the Klimabonus to have been granted.
Invoices must be dated between 1 January 2026 and 31 December 2035. Check that each invoice states the window type, the Ug value of the glazing, the area and the unit price — this information is required for the Klimabonus payout.
Once the work is complete, submit your Klimabonus payment claim via MyGuichet.lu. It must be filed within 4 years following the year of the invoice, and no later than 31 December 2039. Also send the supporting documents to your energy supplier for Enoprimes. File your 3% VAT claim with the AED if the reduced rate was not applied directly.
5 mistakes that blow your window budget in Luxembourg
1. Signing the purchase order before getting Enoprimes and Klimabonus approval
This is the most common and the most expensive mistake. For Enoprimes, any order signed before approval automatically makes the application inadmissible. For the Klimabonus, starting work without approval in principle means your application will be rejected. Either way, you lose anything from a few hundred to several thousand euros in grants.
2. Confusing Ug and Uw on the quote
Ug is the thermal value of the glazing alone. Uw is the value for the whole window (frame + glazing) — it is Uw that measures the window’s actual performance, whereas the Klimabonus 2026 requires glazing with Ug ≤ 0.6 W/m²K. Glazing with Ug = 0.5 can give a Uw of 0.8 or 1.1 depending on the quality of the frame. Always insist that both Ug and Uw are explicitly stated on the quote and on the product data sheet.
3. Choosing overlay fitting to save money in the short term
Overlay fitting costs €100 to €200 less per window than full frame removal. But it keeps the thermal bridges of the old outer frame, reduces the effective glazed area and can compromise airtightness (although the Klimabonus does not prescribe an installation method). The short-term saving often turns into a long-term cost.
4. Getting only one quote
In Luxembourg, prices for windows and external doors can vary by 30 to 50% from one supplier to another for identical specifications. Ask for at least 3 detailed quotes, making sure each one states the same Uw, the same material, the same installation method and the same guarantees.
5. Forgetting to check the masonry before budgeting
Damaged window reveals (cracks, settlement, trapped moisture) can add €100 to €300 per window in masonry repairs not included in the initial quote. Have the existing reveals inspected during the measuring visit so that this work can be priced from the outset.
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