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Custom Velux Window Installations in London
A well-fitted Velux window changes a loft. It can turn a dim, low-ceilinged storage space into a light-filled bedroom, study or family room without the cost or hassle of a full dormer. As experienced installers, Roofers in London handles every stage of Velux roof window installation London property owners need — from sizing and specification to flashing, blinds, blackouts and the integration with your existing slate, tile or flat roof.
We've fitted hundreds of Velux units in London, on everything from listed Georgian terraces to new-build loft conversions, and we know how to make the finished result watertight, draft-free and tidy on the inside as well as the outside. If you're looking for Velux window installation London tradespeople actually warranty against leaks, you've found the right team.
Why Choose This Service
A Velux window is only as good as the flashing kit it sits in and the trimming it has on the inside. Done well, you get a unit that looks like it was always meant to be there, with no leaks, no cold spots and no rattling.
Done badly, you get drips on the windowsill every winter and a draft you can't quite trace. Our Velux installation service is built around getting the boring details — flashing, vapour control, insulation continuity, internal lining — exactly right.
Key Benefits
- Centre-pivot, top-hung, electric and solar-powered Velux options
- Conservation-style Velux units for listed and conservation-area properties
- Velux Cabrio balcony units — a roof window that opens into a small balcony
- Manufacturer flashing kits matched precisely to your existing roof finish
- Insulation continuity through the rafter line — no cold bridges
- Internal hardwood or plasterboard reveal options
- Blackout, sun-screening, energy-saving and remote-controlled blinds
- Loft-conversion glazing packages designed as a coordinated system
- Velux Active home-automation integration on supported models
- Aftercare and adjustments under our written workmanship guarantee
Our Process
1
On-site visit
We assess the loft, the rafter spacing and the existing roof covering.
2
Use & light discussion
Room use, light direction, view and ventilation — these guide the spec.
3
Specification
Size, opening style, glazing spec (low-E, triple-glazed, sound-insulating).
4
Written quote
Window, flashing kit, blind options and installation — fixed price where possible.
5
Internal preparation
We protect the loft floor, contents and stairwell with dust sheets and floor protection.
6
Cutting back the roof
Existing covering and battens removed to the rafter zone.
7
Trimming and kerb forming
Rafters trimmed where needed within structural limits, kerb formed in timber.
8
Velux frame installation
Frame fitted square, level and weathered to BS 8201.
9
Manufacturer flashing kit
Slate, tile or flat-roof flashing kit installed to spec — no improvised metalwork.
10
Internal lining and commissioning
Plastering, blind installation and final commissioning of opening mechanisms.
Common Problems We Solve
• Old Velux units leaking around the flashing — usually because the kit was wrong for the roof finish
• Loft conversions where the original installer cut corners on the flashing
• Conservation-area properties needing low-profile or conservation-style units
• Loft rooms that are too dark for use as bedrooms because there's no rooflight
• End-of-life seals causing misting between the panes
• Loft rooms with poor ventilation that need automated venting Velux units
• Existing Velux windows fitted in the wrong position (e.g. too low to see out of)
• Drafts and water ingress where flashing has lifted in a storm
Areas Covered Across London
We cover all 32 London boroughs plus the City of London. Our most-served areas for this service include Camden, Islington, Hackney, Hampstead, Westminster, Kensington & Chelsea, Tower Hamlets, Southwark, Lambeth, Wandsworth, Greenwich, Lewisham, Ealing, Brent, Haringey, Barnet, Enfield, Croydon, Bromley and Richmond.
Velux installations are one of our most-requested services and we cover every London borough. We do high volumes of work in Camden, Islington, Hackney, Hampstead, Westminster, Kensington & Chelsea, Tower Hamlets, Southwark, Lambeth, Wandsworth, Greenwich, Lewisham, Ealing, Brent, Haringey, Barnet, Enfield, Croydon, Bromley and Richmond.
Why Choose Roofers in London
• Velux-experienced fitters who install roof windows every week
• Flashing kits matched precisely to your roof type — no improvised metalwork
• Fully insured with public liability up to £5 million
• Tidy, considerate work — loft work creates dust, and we contain it
• Workmanship guarantee covering installation and weatherproofing
• Honest specification advice — we'll tell you when an extra rooflight isn't worth it
• Loft-conversion experience — we coordinate with builders and electricians
• One-stop service — no need to chase separate roofers, builders and decorators
Frequently Asked Questions
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Do I need planning permission for a Velux window?
A: Most Velux installations on existing rooflines fall under permitted development if they don't protrude more than 150mm. Listed buildings, conservation areas and front-elevation work usually require approval. We check before any work starts.
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Q: How long does Velux installation take?
A: A single Velux replacement typically takes one day. New installations including internal trimming take 1–3 days depending on rafter alteration and finishing.
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Q: What size Velux should I get?
A: Bigger is usually better for light, but the size is constrained by your rafter spacing. We'll advise the largest unit your roof structure allows without major timber cutting.
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Q: Will a Velux window leak?
A: Only if the flashing kit is wrong, missing or installed incorrectly. With a manufacturer kit matched to your roof finish and installed properly, leaks are extremely rare.
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Q: Will my loft get hotter in summer?
A: Not necessarily — modern Velux glazing has solar-control coatings, and a sun-screening blind keeps temperatures comfortable. We can specify the right glass for south-facing slopes.
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Q: Can you fit Velux units to a flat roof?
A: Yes — Velux makes flat-roof units with curved or flat upstand kerbs. We can specify, supply and fit them as part of a wider flat roofing package.
