Skylight installation in Llangefni: what is involved?
We handle skylight installation across Gwynedd, including Llangefni. In short: survey, supply and fit — new openings, extensions and fit-only work. The survey checks structure, weathering and orientation, so the quote reflects your actual roof.
Wales sees a lot of wind-driven rain, particularly in the west, so upstand height and flashing laps matter more than anywhere. Skylight installation suits new extensions, new openings and fit-only jobs.
Jobs in Llangefni are planned around access: whether the roof can be reached from the garden, whether a hoist or crane is needed, and where we can park. We check this when we measure.
Specification options
- Internal plaster reveal
- New openings with joist trimming
- Upstands and flashings
- Electrics coordination
- Supply and fit
- New openings in existing roofs
- Fixed price in writing before work
What to check first
- Fit-only work relies on the product being suitable and complete
- Work at height is planned with suitable access
Planning, building control and Llangefni
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. 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.
Read the planning permission guide before you commit to a design.
What does skylight installation cost in Llangefni?
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 |
How the job runs
- Get in touch. Use the form, WhatsApp or the guide-price tool with your Llangefni address.
- Free site visit. For new installs we survey free, measure and confirm the roof detail.
- Fixed quote. Product, work and price in writing — nothing is ordered until you agree.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Skylight installation near Llangefni
Related work in Llangefni
Common questions
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.
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 you fit rooflights bought elsewhere?
Yes. We check the product and the opening first, and our workmanship terms cover the fitting rather than the product.
How do I book a survey in Llangefni?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
Do you offer skylight installation in Llangefni?
Yes. We carry out skylight installation in Llangefni and across Gwynedd. Send your postcode and we will offer a survey date when we reply.
