4.8/5 · 328 verified reviews 10-year guarantee English-speaking team
Brussels & Wallonia Mon–Fri 9am–6pm FREN
Renov'Châssis
Aluminium sliding patio door opening onto a garden from a living room
Belgian installer · English-speaking team

Windows & doors in the City of Brussels

Brussel

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

  • Free measuring visit in the City of Brussels
  • 10-year guarantee
  • CSTC-certified fitters

Get my free quote +32 472 89 59 42

Express quote builder Reply within 24h

100% free • No obligation • GDPR-protected data

Express pricing on your dimensions
Send us your dimensions for an instant estimate
Two quick and easy ways to give us your approximate measurements:
Preferred material:
Glazing:
SUMMARY OF YOUR CONFIGURED WINDOWS:
Free measuring visit • €0
When can we come and measure up?
Enter the address, then pick up to 3 time slots in order of preference. We'll confirm the first available one within 24 hours.
WHERE SHOULD WE SEND YOUR QUOTE?

Your windows in the City of Brussels

The City of Brussels is much more than its historic centre. As well as the Pentagon, it takes in Laeken, Neder-Over-Heembeek and Haren to the north and part of the Avenue Louise area: nearly 196,000 residents, four postcodes (1000, 1020, 1120 and 1130) and just about every type of home the capital has to offer. New windows for an attic flat in the Marolles and for a house with a garden in Haren are two very different jobs, and we prepare each one on its own terms. We can handle the whole project with you in English, which helps when Belgian paperwork is new to you.

The Pentagon: heritage, upper floors and co-ownership

In the centre, some buildings are listed or on the heritage inventory, and most homes are flats. So two questions come before any quote: can the look of the façade change, and who has to agree? For a protected building or a flat in a co-ownership, ask the City’s planning department (urbanisme) and your building manager (syndic) before choosing a model. If you rent, the decision is your landlord’s, and you’ll need their written agreement. We prepare the technical documents they’ll ask for: dimensions, frame sections and proposed colours. Slim aluminium frames and wood-effect uPVC stay close to the original joinery, while good double or triple glazing makes the home noticeably quieter.

To the north: Laeken, Neder-Over-Heembeek and Haren

In the north of the municipality, the scenery changes. Laeken mixes townhouses, terraced houses and blocks of flats around the royal estate and the large parks. Neder-Over-Heembeek and Haren have kept a village feel in places, with more single-family houses and gardens. Requests there more often cover a complete set:

  • uPVC or aluminium windows, with double or triple glazing;
  • an insulated front door;
  • a sliding patio door onto the terrace or garden.

In a single-family house, replacing every opening at once lets you match colours and hardware, and deal with airtightness consistently. If your budget means spreading the works, we start with the living areas or the coldest façades, keeping the same model for later.

Access, organisation and grants

From Overijse, 15 km away, we reach the City via the Ring or the E411. The technician who does your free measuring visit also notes the practical side: which floor, how narrow the stairwell is, whether there’s a lift, where we can park. These details shape installation day, especially in the centre. For grants and the EPB certificate (PEB), see the section below – we provide the technical specifications you need.

Why choose Renov'Châssis

The quality of a Belgian manufacturer, the flexibility of a local craftsman

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.

Renov'Châssis fitters installing a new window on site

Installed by CSTC-certified fitters

In-house or certified partner fitters • Adjusted to the millimetre • 10-year guarantee

Direct prices

Save on your renovation by cutting out the middlemen. A transparent quote, line by line.

No reseller margin

Your project, in English

Belgian building rules, listed façades, co-ownership approvals: we explain everything clearly in English, by phone, by email or on site.

English-speaking advisors

EPB certificate

High thermal-performance windows, supplied with the technical data you need for your EPB (PEB) energy certificate.

Technical file supplied

Thermal & acoustic insulation

HR++ double or triple glazing: instant comfort and lower heating bills from the very first winter.

Double or triple glazing

Honest & thorough

A relationship built on trust and transparency

Expert advice, without the jargon

We look at your needs and point you honestly to the right windows for your budget: uPVC, aluminium or wood.

Measurements to the millimetre

A careful, free measuring visit at your home, so there are no surprises on installation day.

Careful installation by CSTC-certified fitters

Respect for your home, protected floors, airtight sealing and a clean site when we leave.

A Renov'Châssis advisor reviewing a client's project plans

A tailored study of your project

We review your plans and existing quotes to offer you the best performance at a fair price.

4.8/5 · 328 verified reviews
A clear, stress-free process

Your new windows in 5 simple steps

We handle everything, from your first quote to after-sales service.

  1. 1

    Free quote within 24h

    Describe your project online and receive your priced offer within 24 hours, with no obligation.

  2. 2

    Measuring visit

    A technician comes to your home to take exact measurements, free of charge.

  3. 3

    Made to measure

    Your windows are manufactured to the exact dimensions taken at your home.

  4. 4

    Careful installation

    Our qualified fitters install everything precisely and leave your home clean.

  5. 5

    10-year guarantee & after-sales

    We remain available after installation for any question, in English or in French.

Not sure about measurements or building rules?

Our advisors will guide you by phone, free of charge, in English.

+32 472 89 59 42
Recent projects in Belgium

Verified reviews & projects

See how our clients in Brussels, Namur and Liège added value to their homes while cutting their energy use.

4.8 / 5

Based on 328 verified reviews (translated from French)

uPVC windows installed by Renov'Châssis 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!”
ML

Mark L.

Homeowner

Aluminium glazed opening installed by Renov'Châssis Namur Aluminium windows
“A very good company, responsive and professional. The aluminium windows are beautiful and the difference in thermal insulation is impressive.”
VL

Virginie L.

Homeowner

uPVC windows installed by Renov'Châssis 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.”
KB

Kenza B.

Professional client

We also work near you

Renolution grants and the EPB certificate in Brussels

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.

Frequently asked questions

I live in the Pentagon: can I replace my wooden windows with uPVC?

It depends on the status of the building. For a listed property, one in the heritage inventory or one in a protected area, changing the material or appearance may require a permit; the City of Brussels' planning department (urbanisme) will tell you what is possible. We then adapt our proposal: wood-effect uPVC, slim aluminium frames, reproduced divisions.

Do you also work in Haren and Neder-Over-Heembeek?

Yes. These districts are part of the City of Brussels and we work there on the same terms as in the centre: measuring visit, detailed quote, supply and installation. They are often easier to reach from the Ring than the Pentagon.

How does installation work in a building without a lift?

The technician notes it during the visit, along with the dimensions of the stairwell. This information is used to organise delivery and the handling of the largest frames, so you know in advance how installation day will go.

Your window project in the City of Brussels

Free quote within 24 hours, then a technician comes to measure up at your home, free of charge. We explain everything in English.

Request a free quote +32 472 89 59 42

Free quote in 24h