Skylight replacement for Barnet: the essentials
We handle skylight replacement across Greater London, including Barnet. In short: replacing tired domes and failed glass with a modern rooflight. The survey checks structure, weathering and orientation, so the quote reflects your actual roof.
Many London roofs are reached only through the house or over neighbouring property, so lifting heavy glass is planned at survey rather than on the day. Think of skylight replacement for older extensions due a modern rooflight.
Jobs in Barnet are planned around access: whether the roof can be reached from the garden, whether a hoist or crane is needed, and where we can park. We check this when we measure.
What you can choose
- Like-for-like size replacement
- Roof window replacement in pitched roofs
- Dome to flat glass upgrade
- Upstand rebuild and insulation
- Fixed to electric opening
- Usually done in a day
- Cures most chronic leaks
Things we check at survey
- Old glass and domes are disposed of responsibly
- Upstand and roof condition decide the scope
Do you need permission in Barnet?
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. Replacing a rooflight or roof window can be self-certified by an installer registered with an authorised competent person scheme; otherwise building control approval is needed.
Read the planning permission guide before you commit to a design.
Skylight replacement prices in Barnet
Prices below are shown including and excluding VAT. In Barnet, as elsewhere, making good inside and access equipment are the main variables.
| 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
- Tell us what you have. Send the EN5 postcode, a rough size and a couple of photos.
- Measure and check. A surveyor visits Barnet, measures and checks structure and access.
- Agree the quote. You approve the specification and price before anything is ordered.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Skylight replacement near Barnet
Related work in Barnet
Questions about skylight replacement in Barnet
Will it mess up my ceiling?
We protect the room and make good the reveal. Minor decoration may be needed afterwards.
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.
Will I need planning permission in Barnet?
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.
Can you work alongside my builder in Barnet?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
