What does skylight installation in Sevenoaks involve?
Thinking about skylight installation in Sevenoaks? The short answer: survey, supply and fit — new openings, extensions and fit-only work. The longer answer depends on your roof, which is why we survey before we price.
Larger gardens in much of the South East mean deeper rear extensions, and deeper rooms need light from above rather than only from the doors. Think of skylight installation for builders' projects and retrofits into finished roofs.
Sevenoaks sits about 10 km from Tonbridge and 13 km from Orpington, and we cover the whole TN13 postcode district and the roads in between.
Choices for your Sevenoaks project
- Supply and fit
- Upstands and flashings
- New openings with joist trimming
- Electrics coordination
- Fit only (customer-supplied units)
- Fixed price in writing before work
- New openings in existing roofs
Things we check at survey
- Structural changes may need an engineer's check
- Fit-only work relies on the product being suitable and complete
Do you need permission in Sevenoaks?
English householder permitted development (Class C) normally covers rooflights that stand no more than 0.15 m proud of the roof plane and stay below the highest part of the roof. 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. The Future Homes and Buildings Standards, published in March 2026, apply from 24 March 2027 and keep the 2.2 W/m²K limit for rooflights.
Read the planning permission guide before you commit to a design.
Guide prices for Sevenoaks
The ranges below are typical for straightforward jobs; your fixed price follows a survey of your roof.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| New opening in an existing roof, supply and fit | £2,395 – £5,395 | £1,995 – £4,495 |
| Supply and fit into a new extension Typical | £1,435 – £3,595 | £1,195 – £2,995 |
| Fit only, customer-supplied unit | £595 – £1,195 | £495 – £995 |
The process, step by step
- Send the details. Postcode, rough size and a photo of the roof and room.
- Survey. We measure the opening, check the roof build-up and agree the options.
- Fixed quote. Product, work and price in writing — nothing is ordered until you agree.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Nearby towns
More we do in Sevenoaks
Questions about skylight installation in Sevenoaks
Is the survey free?
Yes, for new installations. Repair visits are charged.
How long does installation take?
Fitting into a prepared upstand takes about a day. A new opening in an existing roof, including making good, often takes two to three days.
Do I need a structural engineer?
For new openings that cut joists or rafters, a structural check is sensible and building control may ask for calculations.
Do I need to be at home for the survey in Sevenoaks?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
Will I need planning permission in Sevenoaks?
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.
