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Service · fitting

Fitting & installation of window frames

A window frame is only as good as its installation. Tightness, plumb, joints: this is where real performance, comfort and lifespan are decided. Our fitters work by the book, in renovation as in new builds, and leave a clean, finished site.

By the book technical standards respected
Guaranteed tightness air & water
Careful finishes clean joints
wendows fitter adjusting a window frame in its opening, foam and compression tape visible
Made-to-measure fittingto the real measurements
Guaranteed fittingtraceable tightness
Our craftsmanship

Every fitting, tailored to your wall

There is no single way to fit a window frame: the right method depends on your wall, the old frame and the insulation. We choose the technique that guarantees tightness and performance, not the fastest one.

Renovation fitting

The new window frame is fixed onto the existing frame, which is kept, without touching the masonry. Fast and clean work, ideal when the original structure is sound — we treat the joints to avoid any thermal bridge.

Applied fitting

The frame is fitted against the inner wall, in front of the masonry, in the plane of the insulation. The reference method in new builds and major renovations: insulation continuity and optimal tightness.

Rebate / tunnel fitting

The frame is set into the thickness of the wall, in the rebate (on an existing reveal) or in tunnel (flush with the wall). We adapt the shimming and joints to the exact configuration of the opening.

Air & water tightness

Controlled expanding foam, compression tape (BG1) on the outside, membranes and flexible seals: air and water tightness is treated around the whole perimeter, not just on the surface.

Finishes & joints

Inner sills and ledges, plaster repair, beading and sealing: we hand back a finished opening, ready to paint, with no open plaster or rough joint left.

Removal & disposal

Careful removal of the old frame, floor and surround protection, disposal and sorting of site waste. You get a clean room back, not a job to finish.

How we work

From measuring to final check

  1. On-site measuring

    Precise survey of every opening, choice of fitting method and finishes according to your wall and your insulation. No dimension is taken "by eye".

  2. Made-to-measure manufacture

    The frames are made to the exact dimensions of the survey. Joinery adjusted to the millimetre is the condition of a tight, plumb fitting.

  3. Fitting & tightness

    Removal of the old frame, shimming and plumbing, mechanical fixing, then full treatment of air & water tightness around the whole perimeter.

  4. Finishes & check

    Sills, plaster repairs, sealing, cleaning. Check of the proper operation of the opening sashes and of the tightness before handover.

1 day to fit most of a home’s window frames
4 methods renovation, applied, rebate, tunnel
100% of the perimeter treated for tightness
0 thermal bridge left at the joints
Renovation or full removal?

Renovation fitting or full removal?

Keeping the old frame speeds up the job and reduces damage, but only makes sense if the structure is sound. When the frame is degraded or you want to recover the original glazed surface, full removal is the way. We guide you without selling you the most expensive solution.

  • Renovation fitting: fast, clean, sound frame kept
  • Full removal: new frame, daylight area recovered, insulation redone
  • We decide at the survey, based on the real state of your structure
See window frame replacement →
Photo — comparison of renovation fitting on an existing frame vs full removal to the structural work
Window frames to be fitted properly?

We come and take the measurements, advise you on the right fitting method and handle everything, removal and finishes included.

Frequently asked questions

Window fitting

How long does it take to fit window frames?

The fitting itself is fast: most of a home’s window frames are fitted in one day, sometimes two for a large job or a full removal. The measuring and made-to-measure manufacture beforehand take a few weeks depending on the material and finish chosen.

Do the interior finishes need redoing after fitting?

We handle the basic joints and finishes — sealing, beading, plaster repair around the frame — to hand back a finished opening. A major renovation (new stone sills, full repainting of the room) may require an extra we price separately at the survey.

Is removal of the old frame included?

Yes. Removal of the old frame, protection of floors and surrounds, as well as disposal and sorting of waste are included in the fitting service. You get a clean room back, with no job to finish yourself.

Do you offer a guarantee on the fitting?

The fitting is guaranteed on top of the manufacturer’s warranty on the frame. Air & water tightness and the soundness of the work are our responsibility as fitters: if a fitting defect appears, we step in. Our installations follow good practice (the sector’s technical guidance notes).

Good practice

What a fitting by the book guarantees

A high-performance window frame badly fitted loses most of its qualities. A mastered fitting is all of this at once.

  • Continuous air tightness around the whole perimeter, with no infiltration
  • Water tightness that drains outward, never inward
  • No thermal bridge left at the frame / masonry joints
  • A window frame perfectly plumb, level and square
  • Opening sashes that close just right, without forcing or play
  • Durable sealing, mastered foam and compression tape
  • Clean sills and plaster joints, ready to finish
  • A clean site: removal, protection and disposal included
Coverage

Our service areas

LiègeNamurCharleroiMonsBrusselsWavreVerviersHuyWaterlooLa LouvièreTournaiGemblouxNivellesMarche-en-Famenne

Your municipality isn’t listed? See all our areas.

Customer reviews

They chose wendows

5.0/5 · 5verified reviews

« Nous avons fait appel à la société Wendows pour le renouvellement de nos châssis et nous sommes vraiment ravis du résultat ! Les travaux ont été réalisés dans les délais annoncés et la finition est impeccable. De plus, M. Aprile qui s'est occupé du devis, s'est toujours montré disponible pour répondre à toutes nos questions. Nous vous recommandons donc de faire appel à eux pour vos travaux ! »
Annick Hauteceur
« Nous avons fait appel à Wendows pour le remplacement de nos châssis et nous sommes très satisfait de notre choix. Qualité et suivi de chantier au top ! »
David Sautois
« Ik heb via WEndows een raam aangekocht van 2m x 2m. Mijn algemene ervaring is goed. Zeer goeie communicatie, altijs zeer snelle reactie bij een vraag of opmerking. Het installatie team werkte ook zeer efficient. Tevreden van het eindresultaat! Bedankt WEndows »
Tom Bauwens

A window fitting to entrust?

Describe your project: we come and take the measurements, define the right fitting method and give you a clear quote, finishes included.

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