Loft conversion skylights for Porthmadog: the essentials
We handle loft conversion skylights across Gwynedd, including Porthmadog. In short: roof windows planned for loft rooms — light, headroom and escape. The survey checks structure, weathering and orientation, so the quote reflects your actual roof.
Welsh planning rules exclude rooflights from permitted development in conservation areas and National Parks, so we check the designation before quoting. In Porthmadog, as anywhere, loft conversion skylights are the usual choice for attic bedrooms, offices and en-suites.
From Porthmadog to Pwllheli, Caernarfon and Dolgellau, the same survey-first process applies: measure, specify, fix the price, then fit.
Options we can specify in Porthmadog
- Balcony roof windows on some ranges
- Centre-pivot or top-hung
- Combination and stacked layouts
- Electric or solar opening
- Conservation styles
- Set out on the rafters before plastering
- Electric opening for high windows
Before you order: points to check
- Escape-window requirements apply to some loft rooms
- Insulation and vapour control details matter for condensation
Consents for loft conversion skylights 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.
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.
Our planning guide covers each nation in more detail.
What do loft conversion skylights cost in Porthmadog?
Guide prices for loft conversion skylights in Porthmadog are the same as anywhere we work — what changes the price is the job: access, structure, scaffold and finishing.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Electric top-hung escape window | £1,675 – £2,395 | £1,395 – £1,995 |
| Standard centre-pivot window Typical | £1,195 – £1,675 | £995 – £1,395 |
| Small window into open rafters | £955 – £1,315 | £795 – £1,095 |
The process, step by step
- Tell us what you have. Send the LL49 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.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Neighbouring towns
More we do in Porthmadog
Common questions
Do loft roof windows need to be escape windows?
Some loft rooms need an escape window, depending on the layout and the fire strategy for the conversion. Building control confirms the requirement.
Will the loft be cold near the windows?
Correctly fitted insulation collars and linings keep the window surround warm and reduce condensation.
Can you work alongside my loft builder?
Yes — we set out and fit the windows to the builder's programme.
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.
Is the survey in Porthmadog free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
