Skylight replacement in Highgate: what is involved?
For Highgate homes and buildings we offer skylight replacement: replacing tired domes and failed glass with a modern rooflight. We measure first, specify to the opening and confirm any planning or building-control points before quoting.
Mansard and loft conversions are common across London, and roof windows are often set out alongside dormers on the rear slope. Think of skylight replacement for yellowed domes, misted glass and leaking roof windows.
Highgate is around 7 km from central London, and we survey and fit throughout that part of Greater London, including the N6 district.
What you can choose
- Upstand rebuild and insulation
- Dome to flat glass upgrade
- Roof window replacement in pitched roofs
- Fixed to electric opening
- Misted glass unit replacement only
- Often reuses the existing opening
- Clearer view and more light
Before you order: points to check
- Old glass and domes are disposed of responsibly
- Upstand and roof condition decide the scope
Planning, building control and Highgate
In England a rooflight on a house is usually permitted development under Class C if it projects no more than 150 mm beyond the roof slope and sits no higher than the ridge. 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.
What does skylight replacement cost in Highgate?
Guide prices for skylight replacement in Highgate are the same as anywhere we work — what changes the price is the job: access, structure, scaffold and finishing.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Replacement with upstand rebuild and opening unit | £2,995 – £4,795 | £2,495 – £3,995 |
| Dome to flat glass upgrade Typical | £1,915 – £2,995 | £1,595 – £2,495 |
| Like-for-like glass rooflight | £1,555 – £2,155 | £1,295 – £1,795 |
The process, step by step
- Send the details. Postcode, rough size and a photo of the roof and room.
- Free site visit. For new installs we survey free, measure and confirm the roof detail.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Nearby towns
Other services in Highgate
Common questions
How long does a replacement take?
Usually a day for a standard rooflight on a sound upstand.
Can I go bigger when replacing?
Possibly. Enlarging the opening means trimming joists, so we check the structure first.
Do I need building regulations approval to replace a rooflight?
Replacements in existing homes generally need to meet current thermal standards and may need notification or approval. We advise on the route for your job.
Do I need to be at home for the survey in Highgate?
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 Highgate?
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.
