How we approach skylight replacement in Caernarfon
Thinking about skylight replacement in Caernarfon? The short answer: replacing tired domes and failed glass with a modern rooflight. The longer answer depends on your roof, which is why we survey before we price.
Chapels, barns and farm buildings converted across Wales often need bespoke or conservation-style glass. In Caernarfon, as anywhere, skylight replacement is the usual choice for older extensions due a modern rooflight.
Caernarfon is around 13 km from Bangor, Gwynedd, and we survey and fit throughout that part of Gwynedd, including the LL55 district.
Specification options
- Misted glass unit replacement only
- Roof window replacement in pitched roofs
- Upstand rebuild and insulation
- Like-for-like size replacement
- Dome to flat glass upgrade
- Usually done in a day
- Option to add opening and rain sensor
What to check first
- Upstand and roof condition decide the scope
- Old glass and domes are disposed of responsibly
Consents for skylight replacement in Caernarfon
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. Listed buildings need listed building consent from the council, and flats have no householder permitted development rights.
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. 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.
Guide prices for Caernarfon
These are typical supply-and-fit ranges. For an address in Caernarfon, 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 |
|---|---|---|
| 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
- Send the details. Postcode, rough size and a photo of the roof and room.
- Measure and check. A surveyor visits Caernarfon, measures and checks structure and access.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Neighbouring towns
Related work in Caernarfon
Questions about skylight replacement in Caernarfon
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.
Will it mess up my ceiling?
We protect the room and make good the reveal. Minor decoration may be needed afterwards.
How long does a replacement take?
Usually a day for a standard rooflight on a sound upstand.
Will I need planning permission in Caernarfon?
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.
Can you work alongside my builder in Caernarfon?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
