What do flat rooflights in Porthmadog involve?
Flat rooflights in Porthmadog means fixed double or triple glazed rooflights for flat roofs and extensions. We cover the LL49 district and the rest of Gwynedd, with a survey before any price is fixed.
Many Welsh homes have older single-storey rear extensions where a glass rooflight brightens a dark kitchen. Think of flat rooflights for landings, bathrooms and rear extensions with flat roofs.
We work across Gwynedd, including Porthmadog, and in neighbouring towns such as Pwllheli and Caernarfon. Access, parking and how the glass reaches the roof are all checked at the survey.
Specification options
- Frame colours: anthracite, black, white or RAL
- Square, rectangular or long-format sizes
- Insulated kerb or timber upstand built to suit
- Rain sensor if paired with an opening unit
- Integral or fitted blinds
- Inner pane laminated for safety overhead
- Fixed units are simple, quiet and low-maintenance
Before you order: points to check
- New openings in an existing roof need a structural check on joists
- Needs a properly formed upstand — usually at least 150 mm above the finished roof surface (check the manufacturer's figure)
Planning and building rules for Porthmadog
Planning rules in Wales are tighter than in England for rooflights: Class C rights do not apply in conservation areas, National Parks or AONBs, so a rooflight there needs planning permission. Listed buildings need listed building consent from the council, and flats have no householder permitted development rights.
Welsh Building Regulations expect new or replacement rooflights to reach 2.2 W/m²K and roof windows 1.4 W/m²K or a Band B rating. Wales also has its own overheating rules (Part O) for new homes, in force since November 2022.
Read the planning permission guide before you commit to a design.
What do flat rooflights 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 |
|---|---|---|
| Large or triple glazed (1500 × 2500 mm and up) | £2,395 – £4,195 | £1,995 – £3,495 |
| Mid-size double glazed (1000 × 2000 mm) Typical | £1,675 – £2,395 | £1,395 – £1,995 |
| Small double glazed (up to 1000 × 1000 mm) | £1,195 – £1,795 | £995 – £1,495 |
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.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Neighbouring towns
More we do in Porthmadog
Common questions
Double or triple glazing?
Double glazing suits most domestic jobs. Triple glazing improves thermal performance and cuts noise from rain, which is worth it over bedrooms or where the energy calculation is tight.
Can a flat rooflight be walked on?
Not unless it is designed as a walk-on unit with structural laminated glass. A standard flat rooflight is for light only — if the roof is used as a terrace, choose a walk-on rooflight instead.
Do flat rooflights leak?
A well-fitted flat rooflight should not leak. Leaks almost always come from the upstand or membrane detailing, not the glass unit, which is why the upstand height and the way the roof covering is dressed up and under the frame matter more than the brand.
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.
Can you work alongside my builder in Porthmadog?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
