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.
4.8/5 · 328 verified reviews
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Our head office is in Overijse, so Flemish Brabant is home ground for us. It is a Dutch-speaking province, yet plenty of non-Dutch speakers live around Brussels – in the municipalities with language facilities such as Kraainem, Wezembeek-Oppem, Rhode-Saint-Genèse, Linkebeek, Drogenbos and Wemmel, and in neighbours such as Tervuren, Hoeilaart, Zaventem and Beersel. If finding a window company that speaks your language has been a struggle, you’ve come to the right place: we can deal with you in English from the first call to the day we fit.
South-east of Brussels, between the Sonian Forest, the Dyle valley and the hills of Overijse and Hoeilaart, many homes are detached villas and houses on residential estates, mostly built after the war. Think big gardens, lots of glass on the garden side and frames that are often near the end of their life. The older villages still have brick houses and a few farms, and Hoeilaart keeps traces of its glasshouse grape-growing tradition. In these wooded areas, façades often stay in shade for much of the day, so glazing is chosen as much for light as for insulation.
To the north and west, around Vilvoorde, Grimbergen, Dilbeek and Halle, the housing is more urban, with terraced houses and flats, and Leuven adds the housing stock of an old university city.
Dealings with Flemish municipalities take place in Dutch (the facility municipalities have their own rules for French). If your project changes the look of a façade, check with your municipality before ordering. We can supply the plans and technical descriptions they need, and explain in English what is being asked of you. If you rent, replacing windows needs your landlord’s written agreement. Grants come from the Flemish Region – see the section below – and we provide what you need for the energy performance certificate (EPC), without quoting any amount.
Being close by, with direct access to the Ring and the E411, a technician can come round quickly for a measuring visit. You then get a detailed quote, which we can go through with you line by line in English. Find your municipality in the list below.
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
In Flanders, renovation support comes from the Flemish Region through Mijn VerbouwPremie, reformed on 1 July 2025. For windows, it covers high-efficiency glazing, its conditions depend on your income category, and replacing windows comes with a ventilation requirement. Check your situation on vlaanderen.be (in Dutch) before ordering.
We provide the technical specifications of the windows we install, useful for your application and for the home's energy performance certificate (EPC).
Information checked on 17 October 2026.
Yes. Everything between us – from the measuring visit to installation – can be in English, and we take you through the quote line by line. Documents you file with a Flemish authority, however, may need to be in Dutch.
Renovation support in Flemish Brabant comes from the Flemish Region, and its conditions change over time. We help you identify the steps and gather the technical documents, but cannot guarantee any amount.
Often with the largest and most exposed openings, such as the patio door onto the garden and the front door. During the visit, the technician looks at all the windows and suggests an order of priority if you do not want to replace everything in one go.
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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