Skylight installation in Carmarthen: what is involved?
Skylight installation in Carmarthen means survey, supply and fit — new openings, extensions and fit-only work. We cover the SA31 district and the rest of Dyfed, with a survey before any price is fixed.
Welsh planning rules exclude rooflights from permitted development in conservation areas and National Parks, so we check the designation before quoting. Skylight installation suits builders' projects and retrofits into finished roofs.
Carmarthen is around 22 km from Llanelli, and we survey and fit throughout that part of Dyfed, including the SA31 district.
Specification options
- New openings with joist trimming
- Fit only (customer-supplied units)
- Upstands and flashings
- Internal plaster reveal
- Supply and fit
- Making good inside included
- Fixed price in writing before work
What to check first
- Structural changes may need an engineer's check
- Fit-only work relies on the product being suitable and complete
Consents for skylight installation in Carmarthen
In Wales a rooflight on a house is usually permitted development if it stands no more than 15 cm proud of the roof, except on protected land such as conservation areas and National Parks, where permission is needed. Listed buildings need listed building consent from the council, and flats have no householder permitted development rights.
In Wales the limiting values are 2.2 W/m²K for a rooflight and 1.4 W/m²K (or WER Band B) for a roof window in an existing house. A revised Welsh Approved Document L takes effect on 4 March 2027; rooflights in new dwellings stay at 2.2 W/m²K.
See our building regulations guide for U-values, glazing limits and self-certification.
Skylight installation prices in Carmarthen
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 |
What happens next
- Tell us what you have. Send the SA31 postcode, a rough size and a couple of photos.
- Measure and check. A surveyor visits Carmarthen, measures and checks structure and access.
- Agree the quote. You approve the specification and price before anything is ordered.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Neighbouring towns
More we do in Carmarthen
Skylight installation in Carmarthen: questions
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.
Can you work alongside my builder in Carmarthen?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
How do I book a survey in Carmarthen?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
