Window Frame Replacement
Replace old, drafty frames with custom wooden frames and HR++ thermal glass in 4–6 weeks — one day per opening.
If your frames are more than 25 years old, you are losing money every winter. We replace single-glazed, PVC or aluminum window frames with new, custom-built wooden frames and HR++ or triple insulating glass. The result: 30–40% less heat loss, a noticeably quieter home and an ISDE/SVVE subsidy refund on top.
When to replace versus restore
If the timber is still sound but the seals are gone, we can often restore the original frame and retrofit modern double glazing. If the timber is rotten, the profile is loose, or the U-value is single-pane, replacement is almost always cheaper over a 10-year horizon than incremental repairs.
Minimal disruption to your home
Most openings are out and the new frame is fitted within a single day. We protect the floor and walls, vacuum daily, and finish the interior trim so the room looks better than before. Heating is back on the same evening.
What you save
A 4-bedroom Belgian terrace house typically saves €600–€1,200 per year on heating after a full replacement. ISDE/SVVE/Renolution subsidies can return up to 30% of the cost. Most clients break even on heating savings + subsidy within 7–10 years.
Materials
- Nordic pine — most common replacement timber
- Oak — for heritage or coastal homes
- Spruce — for paint-grade replacements
How we replace your window frames
- 1
Survey & quote
We visit, measure each opening and check the wall, lintel and sill condition. Quote within 3 working days.
- 2
Manufacturing
Your new frames are built in our Brussels workshop over 2–3 weeks, with hardware and seals factory-fitted.
- 3
Installation day
We protect the room, remove the old frame, fit the new frame, seal it, finish the interior trim. One day per opening.
- 4
Subsidy filing
We provide the technical attestations and U-value certificates for your ISDE / SVVE / Renolution claim.
Examples
Frequently Asked Questions
Will the walls be damaged?
No. We remove the old frame from inside the existing opening and fit the new one to the same dimensions. The wall stays untouched. We refinish the interior trim so it looks brand new.
Can you replace one frame at a time?
Yes — we often do single-frame replacements (e.g., a kitchen window before a renovation, or a leaking bathroom frame). Subsidy applications still work for one frame.
How much does a single replacement cost?
A standard 1.2 × 1.5 m wooden replacement with HR++ glass typically falls between €1,400 and €2,200 installed. We give a fixed quote per opening so there are no surprises.
Replace your old frames before next winter
Book a free survey now and we can have your new frames in by the end of October.
Book Free SurveyOur other services
Custom Wooden Window Frames Made to Measure
Solid wood frames with HR++ or triple thermal glass — built in our Brussels workshop, fitted to your exact opening.
ViewCustom Wooden Doors
Bespoke front doors, interior doors and patio doors — made in solid wood with the security hardware your home deserves.
ViewFull Home Renovation
One team, one quote, one project manager — from window frame replacement to the last coat of paint.
View