Flat rooflights in Sunbury-on-Thames: what is involved?
Our flat rooflights service in Sunbury-on-Thames covers fixed double or triple glazed rooflights for flat roofs and extensions. Every job starts with a survey of the opening, the roof covering and the room below, and a fixed written price.
Period cottages and conservation-area streets are common in the South East, so slim conservation rooflights are often the right choice. In Sunbury-on-Thames, as anywhere, flat rooflights are the usual choice for landings, bathrooms and rear extensions with flat roofs.
From Sunbury-on-Thames to Walton-on-Thames, Hampton and Ashford, Surrey, the same survey-first process applies: measure, specify, fix the price, then fit.
Options we can specify in Sunbury-on-Thames
- Square, rectangular or long-format sizes
- Insulated kerb or timber upstand built to suit
- Solar-control or self-cleaning outer pane
- Plastered or lined internal reveal
- Double or triple glazing
- Double or triple glazed with a warm-edge spacer
- Pairs with an opening unit where you also need ventilation
Before you order: points to check
- New openings in an existing roof need a structural check on joists
- The roof membrane must be dressed up the upstand before the unit goes on
Planning, building control and Sunbury-on-Thames
Most rooflights on English houses do not need planning permission, provided they keep within 150 mm of the roof surface and below the ridge line. A rooflight on a side-facing slope must be obscure-glazed, and fixed shut unless the opening part is more than 1.7 m above the floor.
Under Approved Document L, a rooflight added to an English home must achieve at least 2.2 W/m²K (horizontal plane), and a roof window 1.4 W/m²K or Window Energy Rating Band B. In an extension, glazing including rooflights is normally limited to 25% of the new floor area plus any windows or doors the extension covers, unless a whole-house calculation shows otherwise.
See our building regulations guide for U-values, glazing limits and self-certification.
Flat rooflights prices in Sunbury-on-Thames
Prices below are shown including and excluding VAT. In Sunbury-on-Thames, as elsewhere, making good inside and access equipment are the main variables.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Large or triple glazed (1500 × 2500 mm and up) | £2,395 – £4,195 | £1,995 – £3,495 |
| Mid-size double glazed (1000 × 2000 mm) Typical | £1,675 – £2,395 | £1,395 – £1,995 |
| Small double glazed (up to 1000 × 1000 mm) | £1,195 – £1,795 | £995 – £1,495 |
The process, step by step
- Tell us what you have. Send the TW16 postcode, a rough size and a couple of photos.
- Measure and check. A surveyor visits Sunbury-on-Thames, measures and checks structure and access.
- Fixed quote. Product, work and price in writing — nothing is ordered until you agree.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Neighbouring towns
More we do in Sunbury-on-Thames
Questions about flat rooflights in Sunbury-on-Thames
Double or triple glazing?
Double glazing suits most domestic jobs. Triple glazing improves thermal performance and cuts noise from rain, which is worth it over bedrooms or where the energy calculation is tight.
Can you fit into my existing flat roof?
Yes. We form a new opening, trim the joists, build and waterproof an upstand and make good the ceiling. A survey confirms the joist direction and roof build-up first.
How long does it take?
Fitting into a prepared upstand usually takes a day. Forming a new opening in an existing roof, including making good inside, is often two to three days.
Do you fit flat rooflights in Sunbury-on-Thames?
Yes. We survey and fit flat rooflights in Sunbury-on-Thames and across Surrey. Send your postcode and we will offer a survey date when we reply.
How do I book a survey in Sunbury-on-Thames?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
