A cracked pane in a roof lantern needs prompt attention because the glass is overhead. Send photos from Porthmadog (LL49) and we'll tell you which it is — with the price agreed in writing before any work.
Signs you need cracked lantern glass replacement
- A visible crack in the outer or inner pane
- A starburst from an impact point
- A crack running from an edge (often thermal stress)
Why it happens
Impact
Hail, falling branches or dropped tools.
Thermal stress
Uneven heating across a pane, edge damage or partial shading can crack glass from the edge.
About Porthmadog and the LL49 area
Western and upland parts of the UK get more rain and more wind-driven rain than the east, and that's what finds weak cappings and blocked eaves first. Lanterns here benefit from a check of the bars on the most exposed face and a clear eaves channel before winter.
Near the coast, salt in the air is hard on aluminium finishes and fixings; washing the frame occasionally and touching in chips keeps corrosion away.
We cover Porthmadog as part of Gwynedd, about 21 miles from Bangor, Gwynedd.
Close by, we also cover Pwllheli (12 miles), Caernarfon (16 miles), Dolgellau (16 miles).
How much should it cost?
Most cracked lantern glass replacement jobs come in between £295 and £795 ex VAT (£354–£954 including VAT), per glass unit. Towers or scaffold, where needed, are priced into the quote. Your fixed price is confirmed in writing before any work starts.
Do you need permission in Wales?
In Wales, like-for-like repairs to a roof lantern don't usually involve building control. A full replacement or a bigger opening is controlled under the Building Regulations 2010 (as applied in Wales), so we set out the route in writing first. Listed buildings in Wales need listed building consent from the local planning authority for alterations, with Cadw guidance on historic buildings; check with the council before changing a lantern on a listed property.
How does it work?
- Send photosWhatsApp or upload a few photos and tell us when it leaks.
- Guide priceWe reply with a guide price and whether a visit is needed.
- Fixed price in writingYou approve the price and the date before anything starts.
- Repair and testWe fix what's failed, water-test where it matters, and send photos.
Cracked lantern glass replacement in Porthmadog: questions
Do you cover Porthmadog?
Yes. We cover Porthmadog, including the LL49 postcode area, as part of Gwynedd. Send photos by WhatsApp or the form for a free guide price, and we'll confirm the fixed price in writing before any work starts.
Which places near Porthmadog do you cover?
As well as Porthmadog, we cover nearby Pwllheli, Caernarfon, Dolgellau, Bangor, Gwynedd and the rest of Gwynedd.
Is it covered by home insurance?
Accidental damage often is; check your policy. We can provide a written quote and photos for your insurer.
Why did my glass crack on a sunny day?
Thermal stress — one part of the pane heats faster than another, often where it's shaded or chipped at the edge.
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