What does skylight installation in Porthmadog involve?
Skylight installation in Porthmadog means survey, supply and fit — new openings, extensions and fit-only work. We cover the LL49 district and the rest of Gwynedd, with a survey before any price is fixed.
Chapels, barns and farm buildings converted across Wales often need bespoke or conservation-style glass. Typical uses for skylight installation include new extensions, new openings and fit-only jobs.
From Porthmadog to Pwllheli, Caernarfon and Dolgellau, the same survey-first process applies: measure, specify, fix the price, then fit.
Choices for your Porthmadog project
- New openings with joist trimming
- Fit only (customer-supplied units)
- Supply and fit
- Internal plaster reveal
- Upstands and flashings
- Fixed price in writing before work
- Fit-only for units you have bought
What to check first
- Fit-only work relies on the product being suitable and complete
- Building Regulations approval (a building warrant in Scotland) may be needed
Do you need permission in Porthmadog?
Welsh householder permitted development (Class C) allows rooflights that project no more than 15 cm and sit no higher than the existing roof — but not in conservation areas, National Parks, AONBs or World Heritage Sites. 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.
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.
Our planning guide covers each nation in more detail.
What does skylight installation cost in Porthmadog?
These are typical supply-and-fit ranges. For an address in Porthmadog, scaffold, a hoist for heavy glass, or a new structural opening can move the figure, which is why we survey first.
| 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 |
From enquiry to finished job
- Get in touch. Use the form, WhatsApp or the guide-price tool with your Porthmadog address.
- Free site visit. For new installs we survey free, measure and confirm the roof detail.
- Agree the quote. You approve the specification and price before anything is ordered.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Nearby towns
More we do in Porthmadog
Questions about skylight installation in Porthmadog
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 you work with builders?
Yes — on new extensions we fit to the builder's programme once the upstand or roof is ready.
Who handles building control?
We tell you which route applies — building control approval, a building warrant in Scotland, or in England and Wales self-certification by a registered competent person — and supply the product data.
Do I need to be at home for the survey in Porthmadog?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
How do I book a survey in Porthmadog?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
