Roof lantern leak repairs in Gwynedd

A roof lantern leak is almost always a failed seal, a lifted capping, blocked eaves drainage or a problem where the kerb meets the flat roof — not a failed lantern. We carry out roof lantern leak repairs across Gwynedd, with a guide price from your photos and a fixed price in writing before any work starts.

Rainwater running down an internal glazing bar of a roof lantern above a kitchen

Signs you need roof lantern leak repairs

Drips from a glazing bar or the eaves beam when it rains
Brown staining or bubbling paint on the plasterboard lining around the lantern
Water running down the inside face of the glass

What usually causes it?

Blocked eaves drainage

Most lanterns collect water in a channel inside the eaves beam and let it out through weep slots. Leaves, moss and grit block the slots and the channel overflows indoors.

The kerb or roof junction

If the flat roof membrane isn't dressed high enough up the kerb, or the kerb has no fall, water sits against the joint and finds its way in under the lantern.

Roof lanterns in Gwynedd

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.

What should you expect to pay for roof lantern leak repairs in Gwynedd?

Guide price, per lantern£195–£595 ex VAT£234–£714 inc VAT

Guide price for roof lantern leak repairs: £195–£595 ex VAT (£234–£714 inc VAT), per lantern. 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?

Straightforward repairs — resealing, gaskets, cappings, eaves and like-for-like parts — don't normally need building regulations approval in Wales. Replacing the whole lantern or enlarging the opening is different and falls under the Building Regulations 2010 (as applied in Wales); we confirm in writing which route applies before any replacement. 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.

Roof lantern leak repairs in Gwynedd: questions

Can you fix the leak in the rain?

We can make the lantern safe in wet weather, but sealants and tapes need a dry, clean surface to bond, so permanent repairs are done in a dry window.

Will you show me what was wrong?

Yes. We photograph the failed detail and the finished repair and send them to you with the invoice.

Which towns in Gwynedd do you cover?

All of Gwynedd, including Bangor, Gwynedd, Caernarfon, Dolgellau, Holyhead, Llangefni, Porthmadog. Rural and remote addresses are covered by arrangement.

How do I get a price for roof lantern leak repairs in Gwynedd?

Send a few photos of the lantern and the problem with your postcode, by WhatsApp or the form. We reply with a guide price and confirm the fixed price in writing before any work starts.

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