- Certified Installation Professionals
- All London boroughs covered
- Free, no-obligation quotes
- Certified Installation Pros
- All Across London
We are Velux-certified specialists
Not general builders, pros only
We provide turnkey solutions
Flat roof windows are the best way to bring daylight into rear and side-return extensions, open-plan kitchens and flat-roofed rooms where wall windows can’t reach. Light from above falls straight into the middle of the room, making deep spaces feel open and bright.
Arbor Skylights installs flat roof windows across London, including Forest Hill, Lewisham and Greenwich. Whether you’re building a new extension or adding light to an existing flat roof, we recommend the right size, glazing and opening type for the space.
Flat roofs are less forgiving than pitched roofs, so the fitting matters. Every installation is completed with careful attention to the upstand, insulation and waterproofing, so the window performs as part of the roof rather than a weak point in it.
The go-to choice for kitchen, rear and side-return extensions.
Light from above reaches further into the room than light from the walls.
We fit flat roof windows into felt, EPDM, GRP and single-ply roofs.
Modern double and triple-glazed units and insulated upstands keep heat in.
The upstand and seal are where flat roof windows usually fail, so they get our closest attention.
Neat internal reveals, ready to decorate, with a full clean-up.
New flat roof windows for extensions and flat-roofed rooms, fitted on an insulated, sealed upstand.
Daylight over the island, worktop or dining table in deep rear and side-return extensions.
A minimal, almost flush look for modern extensions and open-plan living.
Manual and electric opening rooflights with rain sensors for ventilation.
Two or more rooflights in a row to light larger spaces evenly.
Bright, glare-free daylight for garden rooms, studios and home offices.
Arbor Skylights provides professional flat roof window installation across London, supplying and fitting rooflights for homes and extensions in areas including Brockley, Forest Hill and Lewisham. Designed specifically for flat roofs, these windows maximise daylight while maintaining insulation, weather protection and energy efficiency.
Flat roof windows are a popular choice for modern extensions, kitchens and open-plan spaces where extra daylight is needed. Available as fixed or opening units, with flat or domed tops, they can turn dark interiors into bright, inviting rooms.
We assess the roof build-up, joists and covering before recommending the most suitable flat roof window. Building a new extension? We coordinate with your builder or architect on sizes and timing so the upstand is right first time.
From survey to handover, we provide a professional flat roof window service across South East London, including Dulwich, Peckham, Greenwich and Blackheath.
1. Survey
We check the roof structure, covering and drainage, and measure for the window.
2. Fixed quote
You get a written quote for the window, upstand, sealing and finishing.
3. Installation
Most flat roof windows take 1 to 2 days, depending on size and roof type.
4. Finishing
We line the internal reveal, test any opening mechanism and clean up.
Light where pitched roof windows can't be used.
Overhead light brightens rooms more effectively throughout the day.
A clean look that suits extensions and open-plan living.
Opening units keep kitchens and living spaces fresh.
Modern glazing and insulated upstands support a warm, comfortable room.
Light from the sky, not from neighbours' windows.
Flat-glass rooflights sit almost flush with the roof for a minimal, modern look. They are the most popular choice for extensions.
Domed flat roof windows use a curved top that sheds water easily and suits budget-conscious projects.
Fixed rooflights maximise light at the lowest cost. Opening rooflights add ventilation, with electric and rain-sensor options.
Walk-on rooflights can be fitted where the roof is used as a terrace
Blinds for heat control and blackout, fitted at the same time.
We install flat roof windows throughout London, with regular work in Dulwich, Peckham, Brockley, Forest Hill, Lewisham, Greenwich and Blackheath.
We also cover Islington, Camden, Hampstead and Finchley in the North; Hackney and Walthamstow in the East; Ealing, Chiswick and Kensington in the West; and Clapham, Wandsworth and Richmond in the South West. Not sure we cover your street? Send us your postcode.
Arbor Skylights was set up for one reason. Most homeowners who need a new skylight or a replacement Velux end up with a general builder, for whom roof windows are a small side job. That is where leaks, poor flashing and rough internal finishes come from.
We took the opposite approach. Skylights, Velux roof windows and flat roof windows are our only trade. Our installers have more than 35 years’ experience and have fitted more than 200k windows across London, from Victorian terraces with narrow staircases to modern flat-roof extensions.
The name says what we care about. An arbor is a shaded space in a garden; we open it to the sky. Every project starts with the same question: how do we bring the most daylight into this room, without ever letting the weather in?
Usually not. Rooflights on flat roofs normally fall under permitted development if they project no more than 150mm above the roof. Listed buildings, conservation areas and flats may need consent.
It depends on the room layout and where you want the light to fall, for example over a kitchen island or dining table. We plan the position with you at the survey.
Yes. Two or more rooflights in a row are a popular way to light larger extensions evenly.
A flat glass rooflight has a minimal, modern profile and usually better insulation. A domed rooflight has a curved top that sheds water easily and costs less. Both are fitted on an upstand.
Yes. Opening flat roof windows provide ventilation, and electric versions can close automatically when it rains.
Options include double or triple glazing, solar-control glass to reduce heat, and obscured glass for privacy.
Most flat roof windows take 1 to 2 days, including forming the opening, building the upstand, sealing and internal finishing.
Yes. They’re one of the most popular features of modern extensions, thanks to their clean look and ability to light deep rooms.
