How we approach skylight replacement in Mitcham
Skylight replacement in Mitcham means replacing tired domes and failed glass with a modern rooflight. We cover the CR4 district and the rest of Greater London, with a survey before any price is fixed.
Mansard and loft conversions are common across London, and roof windows are often set out alongside dormers on the rear slope. In Mitcham, as anywhere, skylight replacement is the usual choice for older extensions due a modern rooflight.
Mitcham is around 12 km from central London, and we survey and fit throughout that part of Greater London, including the CR4 district.
Specification options
- Like-for-like size replacement
- Dome to flat glass upgrade
- Roof window replacement in pitched roofs
- Upstand rebuild and insulation
- Fixed to electric opening
- Option to add opening and rain sensor
- Clearer view and more light
What to check first
- Enlarging the opening changes the structure and may need approval
- Upstand and roof condition decide the scope
Planning, building control and Mitcham
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.
See our building regulations guide for U-values, glazing limits and self-certification.
Guide prices for Mitcham
Guide prices for skylight replacement in Mitcham 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 |
How the job runs
- Tell us what you have. Send the CR4 postcode, a rough size and a couple of photos.
- Measure and check. A surveyor visits Mitcham, 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.
Nearby towns
Related work in Mitcham
Skylight replacement in Mitcham: questions
How long does a replacement take?
Usually a day for a standard rooflight on a sound upstand.
Can you replace only the misted glass?
Sometimes, if the frame is sound and the maker supplies replacement units. Often a complete new rooflight costs little more and performs better.
Can I go bigger when replacing?
Possibly. Enlarging the opening means trimming joists, so we check the structure first.
Can you work alongside my builder in Mitcham?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
Will I need planning permission in Mitcham?
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.
