Skylight Installation in London
Nothing transforms a dark loft or flat-roofed extension like a properly fitted skylight. We install VELUX-style rooflights in pitched and flat roofs across London — daylight, ventilation and a watertight seal guaranteed.
What's Included in Our Skylight Installation
A skylight is only as good as its flashing and sealing — a cheap window fitted badly is a leak waiting to happen. We supply and fit quality rooflights and seal them into the roof covering properly, pitched or flat.
Pitched Roof Skylights
VELUX-style centre-pivot and top-hung rooflights fitted into tiled and slated roofs, with the correct flashing kit for the profile and pitch.
Flat Roof Skylights
Fixed, opening and domed units installed on upstand kerbs for extensions, dormers and garages — the fastest way to flood a flat-roofed room with light.
Like-for-Like Replacements
Old, misted or leaking rooflights swapped for modern equivalents, usually reusing the existing opening so the job is done in a day.
Ventilation Options
Manual and electric opening units for loft rooms and bathrooms, with rain sensors on electric models so they close themselves.
Flashings & Kerbs
New lead or purpose-made flashings on pitched roofs, and properly upstanded kerbs on flat roofs — the watertight details that separate a good job from a leak.
Repairs Too
Not every skylight needs replacing — see our dedicated skylight repair service for leaks, misted glazing and perished seals.
Choosing the Right Skylight
We will recommend the right unit for the room and the roof — but here is the lay of the land so you know the options.
Fixed Skylights
For light only — no moving parts, lowest cost, and nothing to go wrong. Ideal over stairwells and hallways where ventilation is not needed.
Opening Skylights
Centre-pivot for easy cleaning, top-hung for an unobstructed view and maximum airflow. A must for loft bedrooms and bathrooms to control condensation.
Flat Roof Units
Sit on a 150mm upstand kerb above the roof deck — fixed, hinged or electric. We tie them into felt, EPDM and GRP flat roofs without breaking the waterproof layer.
Glazing Matters
Modern double-glazed units with low-emissivity coating keep heat in; triple glazing or laminated glass cut noise from rain — worth it on a loft bedroom. We fit units that meet current thermal standards.
Our Installation Process
1. Free survey
We check the roof structure, the best position for light, and whether the existing opening can be reused — no obligation, no pressure.
2. Fixed written quote
One price for the unit, fitting, flashings and making good inside. You choose the model; we handle everything else.
3. Fitted in a day
Most skylight installations take a single day. We cut the opening, fit the unit, flash and seal it, and leave the room clean — with our full workmanship guarantee.
Signs You Need a New Skylight
- A dark loft or extension that could take natural light from above
- An old rooflight with misting or condensation between the panes
- Leaks or water stains around an existing skylight
- A rotten or perished timber frame on an old roof window
- Condensation problems in a loft bedroom or bathroom — see our guide on loft condensation vs roof leaks
- You are reroofing and the old skylights are the weakest part of the roof
Typical Skylight Installation Costs in London
Realistic 2026 London price bands, supplied and fitted. Your free survey and fixed written quote confirm the exact figure.
Fixed Rooflight: £350–£600
Supply and fit of a standard fixed VELUX-style unit into a pitched roof, including flashings and internal making good.
Opening Rooflight: £450–£800
Centre-pivot or top-hung manual unit fitted and sealed. Electric opening units with rain sensors typically start around £900 fitted.
Flat Roof Skylight: £500–£1,000+
Installed on a new upstand kerb and tied into the flat roof covering — priced by size and whether the unit opens. Our VELUX replacement cost guide has more detail.
Related Services & Areas
For leaking or misted units see skylight repair; for flat roofs generally, flat roof repair; and if the whole covering is due, new roof installation — the ideal moment to add skylights. We install across Islington, Holloway, Tufnell Park and every London borough.
Why Choose Victoria for Skylights
Family-run since 1982
Over 40 years fitting rooflights into London's roofs — we know every flashing detail by heart.
5.0 from 338 Google reviews
Hundreds of London homeowners rate us five stars for honest advice and tidy work.
Fitted in a day
Most installations completed in a single day, with the room left clean and the unit guaranteed.
Open 24 hours
Skylight leaking in a storm? Call 07848 256099 any time for an urgent make-safe.
Skylight Installation FAQs
A fixed VELUX-style rooflight supplied and fitted typically costs £350–£600 in 2026, and a manual opening unit £450–£800. Flat roof skylights on a new kerb usually run £500–£1,000+. Electric units start around £900 fitted. Your free survey gives you a fixed written quote.
Usually yes — on pitched roofs we cut the opening between rafters and fit the unit with the correct flashing kit; on flat roofs we build an upstand kerb and tie it into the waterproof layer. Most jobs are completed in a day, and we always confirm the structure suits the unit before quoting.
Leaks come from bad fitting, not from skylights themselves — the weak points are always the flashings, kerbs and seals. That is why we fit the correct flashing kit for the roof profile and pitch, and back every installation with our full workmanship guarantee. If your existing skylight is already leaking, see our skylight repair page and our guide on leaking VELUX windows.
Skylights that do not project beyond the roof slope are normally permitted development and need no permission. Rules are stricter in conservation areas and on listed buildings, and flat-roof domes above parapets can need approval. If you are unsure, we will flag it at your free survey — and a reroof is the cheapest time to add them.