Flat roof junction and flashing repairs in Gwynedd

The junction where the flat roof covering meets the lantern kerb is a weak point on many extensions. We carry out flat roof junction and flashing repairs across Gwynedd, with a guide price from your photos and a fixed price in writing before any work starts.

Newly trimmed flat roof junction and flashing tape around a roof lantern kerb

Signs you need flat roof junction and flashing repairs

Splits, blisters or lifted edges in the roof covering by the kerb
Missing or loose edge trims and flashings
Ponding on the roof next to the lantern

What usually causes it?

Unbonded membrane

EPDM or single-ply that has come away from the kerb lets water run behind it.

Cracked GRP

Fibreglass roofs can crack at the kerb corner where movement concentrates.

Roof lanterns in Gwynedd

Wind-driven rain is the real test of a roof lantern, and the wetter west sees plenty of it. Leaks that appear only in a storm from one direction usually point to the cappings or eaves on that face — a useful clue when you send us photos.

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 flat roof junction and flashing repairs in Gwynedd?

Guide price, per lantern£245–£695 ex VAT£294–£834 inc VAT

Most flat roof junction and flashing repairs jobs come in between £245 and £695 ex VAT (£294–£834 including 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.

Flat roof junction and flashing repairs in Gwynedd: questions

Do you repair the whole flat roof?

We repair the area around the lantern. If the wider roof is failing we'll tell you and can quote, but we won't push a new roof if a local repair will do.

What does a junction repair cost?

Usually £245–£695 ex VAT, confirmed in writing before work starts.

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 flat roof junction and flashing 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.

Other repairs in Gwynedd

Nearby areas

More about flat roof junction and flashing repairs · All roof lantern repairs in Gwynedd