The choice of windows directly impacts your comfort and energy bill. In Luxembourg, where winters are harsh and energy passport requirements are strict, this choice is crucial. PVC, wood or aluminium: each material has its advantages and disadvantages.
This guide helps you make the right choice for your situation.
Why Material Choice is Crucial in Luxembourg
Luxembourg has some of the strictest energy requirements in Europe. Your home’s energy passport largely depends on the performance of your windows.
A high-performance window must have a Uw coefficient below 1.3 W/m²K to be eligible for Klimabonus grants. The best achieve 0.8 W/m²K. The lower this coefficient, the better the insulation.
With Luxembourg’s climate, high-performance windows can reduce your heating bill by 15 to 25%.
PVC: The Economical and Practical Choice
PVC remains the most common material in Luxembourg, and for good reason.
In terms of advantages, PVC offers the best value for money on the market, with excellent basic insulating power thanks to multiple insulation chambers. It requires no special maintenance, just occasional cleaning. PVC resists the elements perfectly without treatment, and its lifespan reaches 30 to 40 years without problems.
On the downside, the choice of colours remains limited compared to wood or aluminium. PVC is less visually noble and may be problematic in protected areas. It expands slightly with heat and is not 100% recyclable.
Average price: €300 to €600 per standard window (installation included), the cheapest of the three materials.
PVC is perfect if you’re looking for good value for money, if you don’t want maintenance, and if aesthetics isn’t your absolute priority.
Wood: Nobility and Natural Performance
Wood is the traditional material par excellence, appreciated for its character and natural qualities.
The advantages of wood are numerous: a warm and authentic aesthetic, ideal for character homes. It’s an excellent natural insulator with a favourable carbon footprint. Wood is fully recyclable and allows complete customisation with paints and stains. Its lifespan exceeds 50 years with good maintenance.
There are also disadvantages: wood requires regular maintenance with stain or paint every 5 to 10 years. Its price is higher than PVC, and it’s sensitive to humidity if poorly maintained. Manufacturing times are often longer.
Average price: €500 to €900 per standard window (installation included).
Wood is ideal if you have an old or character home, if you’re willing to maintain your windows regularly, and if you prioritise natural materials.
Aluminium: Modernity and Finesse
Aluminium has established itself in contemporary architecture thanks to its fineness and strength.
Its major advantages are ultra-thin profiles that maximise the glazed surface, exceptional strength and weather resistance. Aluminium offers an almost unlimited choice of colours with powder coating and requires no maintenance. Its lifespan reaches 40 to 50 years.
On the other hand, aluminium has some disadvantages: it remains the most expensive material and naturally conducts cold, which requires a mandatory thermal break. It can present condensation if poorly installed and is less suitable for traditional buildings.
Average price: €600 to €1,200 per standard window (installation included).
Aluminium is perfect if you have a modern or contemporary building, if you want large bay windows, and if your budget allows.
Complete Comparison Table
To help you choose, here’s a comparison of the three materials on essential criteria.
In terms of price, PVC costs between €300 and €600, wood between €500 and €900, and aluminium between €600 and €1,200.
For thermal insulation, PVC and wood are excellent with a Uw of 0.9 to 1.2, while aluminium is very good with a Uw of 1.0 to 1.4.
Maintenance is nil for PVC and aluminium, but regular every 5 to 10 years for wood.
Lifespan is 30 to 40 years for PVC, 40 to 50 years for aluminium, and over 50 years for well-maintained wood.
Environmentally, wood is excellent, PVC is average, and aluminium is good if recycled.
PVC aesthetics are standard, wood is warm and noble, and aluminium is modern and fine.
Klimabonus Grants for Your Windows
Window replacement is eligible for Klimabonus grants in Luxembourg, provided certain performance criteria are met.
To be eligible, your new windows must have a Uw coefficient of 1.0 W/m²K or less. The base grant is €50 per m² of replaced window. With the 25% bonus for work completed before end of 2025, the grant rises to €62.50/m².
Example: For 20m² of windows to replace, you can receive up to €1,250 in grants if you act before end of 2025.
Don’t forget to submit your agreement in principle before 31 December 2025 to benefit from the bonus.
How to Choose Based on Your Situation
For an old house in a protected area, wood is often the only choice accepted by authorities. Check with your municipality.
For a recent or contemporary building, aluminium fits perfectly and allows for large glazed surfaces.
For a tight budget with good performance, PVC remains unbeatable in value for money.
For a comprehensive energy renovation, combine the choice of material with triple glazing to maximise gains.
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FAQ
What is the best material for insulation?
Wood and PVC offer the best natural insulation performance. Aluminium requires a thermal break to achieve equivalent performance, which explains its higher price.
Are aluminium windows eligible for Klimabonus?
Yes, provided they meet the maximum Uw coefficient of 1.0 W/m²K. Aluminium windows with thermal break and triple glazing easily reach this level.
How long does it take to replace all windows?
For a standard house with 10 to 15 windows, allow 2 to 3 days of installation. Custom manufacturing generally takes 4 to 8 weeks depending on material and manufacturer.
Can materials be mixed?
Yes, it’s even common. For example, aluminium-clad wood combines the nobility of wood inside with the resistance of aluminium outside. An ideal but more expensive solution.
