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Finding someone good to fit or fix a roof window in London is harder than it should be — specialist firms are small, websites go stale, and “top contractor” lists online are frequently years out of date. So here’s ours with a difference: every firm below was checked as actively trading in July 2026, and we removed two from the previous version of this list that no longer qualify. If a firm’s here, its business is real and its focus is genuinely roof windows.
We have no commercial relationship with any firm listed — see our affiliate disclosure for how this site makes money (it isn’t installer referrals).
The verified list
1. PMV Maintenance and Blinds
Website: pmvroofwindowrepair.com · Focus: repair and renovation
A London VELUX repair specialist — decades of combined experience across repairs, renovations, glazing swaps and blind fitting. Repair-first firms like PMV are the right call when the frame is sound and you need a new pane, gaskets or a motor rather than a whole window.
2. Skylight Services
Website: skylightservices.co.uk · Focus: installation and repair, London & Surrey
Covers the full span — installation, repair and maintenance of roof windows, skylights and rooflights — across London and Surrey. Handles flat-roof products as well as pitched-roof windows, useful when an extension and a loft are in the same project.
3. Absolute Roof Windows
Website: absoluteroofwindows.co.uk · Focus: new installations and replacements
Installation-led: new VELUX fittings and like-for-like replacements for residential and commercial clients in central London. The right shape of firm for first-time installs where the roof opening still needs cutting.
4. Apex Skylights
Website: apexskylights.co.uk · Focus: installations, North London
A North London roof window and skylight specialist with strong customer reviews. Local focus matters in this trade — a fitter ten minutes away quotes tighter and turns up for the snag visit.
How to vet any installer (including these)
Our verification confirms these firms are real and trading — it is not a guarantee of workmanship. Before hiring anyone:
- Check scheme registration at source. TrustMark, FENSA or CERTASS membership means building regs are self-certified — verify the firm on the scheme’s own website, not just a logo in a footer.
- Ask what they fit weekly. A specialist who installs roof windows every week beats a general builder who does two a year — flashing technique is where leaks are born.
- Get three itemised quotes. Window, flashing, labour, access and making-good as separate lines, per our cost guide — London quotes hide the scaffolding line more than anywhere else.
- Confirm the exact product code. Type, size code and glazing in writing, so quotes compare like for like and you’re not silently downgraded to standard glazing.
- Use VELUX’s own installer finder as a cross-check. The manufacturer’s network isn’t exhaustive, but appearing in it is a decent extra signal.
If you’re outside London
The vetting method above works anywhere in the UK — pair it with our installation cost guide for the national price ranges, and expect quotes below London levels almost everywhere else.
Know a London roof-window specialist that belongs on this list — or spotted one above that’s stopped trading? Tell us via the contact details on our about page and we’ll re-verify.
Frequently asked questions
How much does VELUX installation cost in London?
London sits at the top of the national ranges: expect £700–£1,100 fitted for a standard manual window that averages £655–£815 nationally, with scaffolding (£500+) more often required on London terraces. Get three itemised quotes.
Do I need a VELUX-certified installer?
Not strictly — any competent roofer can fit a VELUX — but VELUX's own installer network and TrustMark/FENSA-registered firms give you recourse and self-certified building regs compliance. At minimum, use someone who fits roof windows weekly, not occasionally.
Should I choose a repair specialist or a general builder for a VELUX?
For a straight install or replacement, a roof-window specialist is usually faster and cheaper than a general builder. For a loft conversion or structural work, the builder runs the job and the window is one line item — but ask who actually fits it.
How do I check a VELUX installer is legitimate?
Look for a working website with a real address, TrustMark/FENSA/CERTASS registration you can verify on the scheme's own site, recent reviews on an independent platform, and a written itemised quote. Be wary of cash-only pricing or pressure to skip building regs.
Keep reading
VELUX costs 15–40% more than rival roof windows. Here's what the premium actually buys, when it's worth paying, and when a cheaper brand makes more sense.
Fakro, Keylite, RoofLITE+, Roto and Dakea compared against VELUX on 2026 prices, guarantees and quality — and which alternative fits which job.
Every custom skylight option for UK homes — flat glass, lanterns, walk-on and structural glazing — with 2026 costs, materials advice and the regs.