Skylight replacement in Llantwit Major: what is involved?
For Llantwit Major 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.
Chapels, barns and farm buildings converted across Wales often need bespoke or conservation-style glass. In Llantwit Major, as anywhere, skylight replacement is the usual choice for yellowed domes, misted glass and leaking roof windows.
We work across South Glamorgan, including Llantwit Major, and in neighbouring towns such as Cowbridge and Bridgend. Access, parking and how the glass reaches the roof are all checked at the survey.
Specification options
- Dome to flat glass upgrade
- Misted glass unit replacement only
- Fixed to electric opening
- Roof window replacement in pitched roofs
- Upstand rebuild and insulation
- Option to add opening and rain sensor
- Cures most chronic leaks
Things we check at survey
- Old glass and domes are disposed of responsibly
- Enlarging the opening changes the structure and may need approval
Do you need permission in Llantwit Major?
Planning rules in Wales are tighter than in England for rooflights: Class C rights do not apply in conservation areas, National Parks or AONBs, so a rooflight there needs planning permission. A side-facing rooflight within 10.5 m of the boundary must be obscure-glazed, and non-opening unless the opening part is more than 1.7 m above the floor.
Approved Document L in Wales (2022 edition) sets 2.2 W/m²K for rooflights, measured horizontally, and 1.4 W/m²K or Band B for roof windows in existing homes. Wales also has its own overheating rules (Part O) for new homes, in force since November 2022.
Our planning guide covers each nation in more detail.
Guide prices for Llantwit Major
Prices below are shown including and excluding VAT. In Llantwit Major, 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 CF61 postcode, a rough size and a couple of photos.
- 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 Llantwit Major
Common questions
Can I go bigger when replacing?
Possibly. Enlarging the opening means trimming joists, so we check the structure first.
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 you work alongside my builder in Llantwit Major?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
Do you offer skylight replacement in Llantwit Major?
Yes. We carry out skylight replacement in Llantwit Major and across South Glamorgan. Send your postcode and we will offer a survey date when we reply.
