Most roof lantern leaks start as small, preventable problems: blocked eaves, a lifted capping, a tired seal. Send photos from Porthmadog (LL49) and we'll tell you which it is — with the price agreed in writing before any work.
What you might be seeing
- Dirty glass or green algae on the frame
- Leaves or moss at the eaves
- The lantern is under trees
What usually causes it?
Algae and dirt
Hold moisture against seals and spoil the view.
Unnoticed wear
Nobody looks at the roof until it leaks.
Roof lanterns in Porthmadog
Damp, mild winters keep moss and algae growing on flat roofs and lantern frames, which holds water against seals and blocks weep slots. Regular clearing makes a real difference in wetter areas.
Coastal wind drives rain hard against lanterns, so cappings and ridge seals on the seaward face take the most punishment.
Porthmadog is around 21 miles from Bangor, Gwynedd, and both are within our Gwynedd coverage.
Close by, we also cover Pwllheli (12 miles), Caernarfon (16 miles), Dolgellau (16 miles).
How much should it cost?
Typical range: £95–£245 ex VAT, which is £114–£294 with VAT, per visit. 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.
Cleaning and maintenance in Porthmadog: questions
How do I get a price for cleaning and maintenance in Porthmadog?
Send a few photos of the lantern and the problem, with your Porthmadog postcode. We'll reply with a guide price and tell you whether a visit is needed before we can fix the price.
Can you repair a lantern someone else installed in Porthmadog?
Yes. We repair lanterns whoever fitted them. If yours is still under the installer's warranty, contact them first so you don't affect it.
What does a maintenance visit cost?
Usually £95–£245 ex VAT per visit depending on size and access, confirmed in writing before the visit.
Can you set up regular visits?
Yes — tell us how often you'd like us to come and we'll confirm the price per visit in writing.
Other lantern repairs in Porthmadog
- Misted glass unit replacement in Porthmadog
- Condensation diagnosis and fixes in Porthmadog
- Roof lantern respraying in Porthmadog
- Leak investigation and inspection in Porthmadog
- Urgent leak make-safe in Porthmadog
- Orangery lantern repairs in Porthmadog
Cleaning and maintenance near Porthmadog
More about cleaning and maintenance · All roof lantern repairs in Porthmadog