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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Walloon Brabant is the province next door to our head office: from Overijse, you only have to cross the language border to reach La Hulpe or Rixensart. It is made up of twenty-seven municipalities, from towns such as Wavre, Nivelles and Braine-l’Alleud to the farming villages of the east, around Jodoigne, Perwez and Hélécine. Its housing stock is varied, and replacing windows is not approached in the same way in a villa on a residential estate as in an old farmhouse. Wherever you live in the province, our team can follow your project in English.
A large share of the province’s houses have been built since the post-war years, in green residential areas around Waterloo, Lasne, Rixensart and Chaumont-Gistoux. These detached villas have often kept their original windows, or joinery replaced only once since: single glazing, tired wood, thermal bridges around the frames. These are projects where comfort improves a great deal, especially with a large sliding patio door onto the garden.
Further east and south, the landscape changes: arable plateaux, brick and stone villages, and courtyard farms (fermes en carré), some converted into several homes. Their openings come in irregular shapes and sizes, and we take care to keep the proportions right for the building. Louvain-la-Neuve, a new town built around the university, is mostly flats and brick town houses, where window work is sometimes decided collectively through the co-ownership and its building manager (syndic). If you rent, you’ll need your landlord’s written agreement before anything is replaced.
The E411 crosses the province via Wavre and Louvain-la-Neuve, and the Ring links Waterloo and Braine-l’Alleud, so our technicians reach the west of the province – Tubize, Rebecq, Ittre – as easily as the east. They measure up on site and check the sills and masonry. You then receive a free, detailed quote within 24 hours, which we can explain to you in English.
For grants and the PEB certificate, see the Wallonia section below: we provide the technical specifications you need, but never quote an amount. Choose your municipality from the list below to find out more.
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
Wallonia's temporary 2025-2026 home renovation grant scheme has closed: applications, including the final invoice, had to be submitted by 30 September 2026 at the latest. Among other things, it required a home energy audit before the works and windows with an average Uw value of no more than 1.50 W/m²K. So far, the Walloon Region has not announced a new scheme for windows; official information is published on wallonie.be (in French).
To finance the work, ask about zero-interest loans from the SWCS or the Fonds du Logement de Wallonie. Whatever the grants, efficient windows generally improve the home's PEB energy certificate, which is required to sell or let a property: we provide you with their technical specifications.
Information checked on 17 October 2026.
No, but replacing all the windows at once lets you match their appearance and deal with the airtightness of the house consistently. You can also go façade by façade, starting with the most exposed rooms.
Yes. Our windows are made to measure, so they can follow irregular or old openings. The right colour and glazing-bar layout help preserve the building's character.
For a large sliding patio door, aluminium offers slimmer frames and therefore more light. uPVC remains an insulating and economical solution for more modest sizes. We compare the two based on your measurements.
Free quote within 24 hours, then a technician comes to measure up at your home, free of charge. We explain everything in English.
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