Brussels
6 uPVC windows + door
“I had 6 uPVC windows and a front door installed. The result is excellent, and the installation was done in a single day, just as André promised. No more draughts at all!”
Mark L.
Homeowner
Sint-Lambrechts-Woluwe
Made-to-measure uPVC, aluminium and wood windows with high thermal performance, sold without middlemen and installed under a 10-year guarantee. And our team speaks English, from the first call to the final check.
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Woluwe-Saint-Lambert is 11 km from our head office in Overijse, a few minutes off the Ring. Cut through by the Woluwe valley, this municipality of nearly 58,000 people brings together very different neighbourhoods, from the area around the university campus to the quieter streets of Kapelleveld – and we’re happy to discuss your project in English. When it comes to replacing windows, three situations come up most:
In a garden city, the houses were designed as a whole: the same window design, the same colours, the same proportions. A window that departs from them is immediately noticeable from the street. Before changing the colour, material or divisions, check with your commune’s planning department (urbanisme). We can then reproduce the existing design as closely as possible, in uPVC or aluminium, while replacing the original glazing with double or triple glazing.
In a house with a garden, the project often goes beyond the windows: a new front door, a sliding patio door onto the terrace, sometimes replacing every opening at once. uPVC offers an excellent balance between insulation and price; aluminium is better suited to large glazed areas and slim lines. In a flat, the decision also depends on the co-ownership: check the building rules before choosing a colour, and if you rent, ask your landlord for written agreement before anything else.
Near main roads and tram or bus routes, most noise gets in through the windows. Triple glazing makes bedrooms noticeably quieter – as long as the installation is fully airtight, because a badly made seal lets in sound as easily as air. In flats on higher floors, which catch more wind, the way the opening sashes close deserves the same care: well-adjusted locks and hinges stop whistling and leaks in the autumn gales.
The measuring visit is free and takes place at your home, with a technician who also checks the condition of the masonry. You then receive a detailed quote, which we can go through with you in English. For grants and your EPB certificate (PEB), see the section below – we help with the technical information, but never promise an amount.
No middleman margins: you deal directly with the team that designs, adjusts and oversees the installation of your windows and doors, right down to the finishing touches.
Save on your renovation by cutting out the middlemen. A transparent quote, line by line.
No reseller margin
Belgian building rules, listed façades, co-ownership approvals: we explain everything clearly in English, by phone, by email or on site.
English-speaking advisors
High thermal-performance windows, supplied with the technical data you need for your EPB (PEB) energy certificate.
Technical file supplied
HR++ double or triple glazing: instant comfort and lower heating bills from the very first winter.
Double or triple glazing
We look at your needs and point you honestly to the right windows for your budget: uPVC, aluminium or wood.
A careful, free measuring visit at your home, so there are no surprises on installation day.
Respect for your home, protected floors, airtight sealing and a clean site when we leave.
We handle everything, from your first quote to after-sales service.
Describe your project online and receive your priced offer within 24 hours, with no obligation.
A technician comes to your home to take exact measurements, free of charge.
Your windows are manufactured to the exact dimensions taken at your home.
Our qualified fitters install everything precisely and leave your home clean.
We remain available after installation for any question, in English or in French.
Our advisors will guide you by phone, free of charge, in English.
See how our clients in Brussels, Namur and Liège added value to their homes while cutting their energy use.
Brussels
6 uPVC windows + door
“I had 6 uPVC windows and a front door installed. The result is excellent, and the installation was done in a single day, just as André promised. No more draughts at all!”
Mark L.
Homeowner
Namur
Aluminium windows
“A very good company, responsive and professional. The aluminium windows are beautiful and the difference in thermal insulation is impressive.”
Virginie L.
Homeowner
Liège
Full renovation
“I recommend Renov'Châssis to all my clients. The quality of the products and the reliability of the team are faultless. A partner you can trust.”
Kenza B.
Professional client
Brussels' Renolution grants are currently suspended: no application can be submitted for final invoices dated 2025 or 2026, and the Region has not yet decided on a new form of support. Updates are published on renolution.brussels.
The Ecoreno loan can pre-finance renovation work, and Homegrade offers free advice to Brussels residents. Efficient windows generally improve the home's EPB (PEB) certificate, required when you sell or let a property: we provide you with their technical specifications.
Information checked on 17 October 2026.
In a garden city, the uniformity of the façades is important and a change of colour may be regulated. Woluwe-Saint-Lambert's planning department (urbanisme) will tell you what is allowed for your house. We then adapt our proposal to their answer.
No. Replacing everything at once simplifies the organisation and guarantees a uniform façade, but you can also start with the coldest rooms. We then keep the same model for the rest.
Our windows are CE-certified and installed with a 10-year guarantee (the Belgian "garantie décennale"). The terms are set out in the quote you receive after the measuring visit.
Free quote within 24 hours, then a technician comes to measure up at your home, free of charge. We explain everything in English.
Your window quote in 2 minutes
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