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Gwynedd · LL40

Upstand and kerb repairs in Dolgellau

Dealing with a rotten or leaking kerb in Dolgellau (LL40)? We repair, raise, insulate or rebuild the kerb the lantern sits on and re-cover it, with a fixed price agreed in writing first.

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In Dolgellau, as everywhere, the upstand, or kerb, is the raised frame the lantern sits on. Send photos and we'll tell you what we think has failed.

Roofer dressing EPDM membrane up the timber kerb under a roof lantern

Signs you need upstand and kerb repairs

  • Water appearing below the lantern rather than from the glass
  • Soft or spongy timber at the base of the lantern
  • Roof membrane not lapped up the kerb, or peeling off it

Why it happens

Membrane not dressed up

The flat roof covering should run up the kerb and be trimmed or flashed. If it stops short, water gets behind it.

Rotten timber

Untreated or wet timber kerbs rot from inside, so the lantern loses support and the seals open.

Roof lanterns in Dolgellau

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.

From Bangor, Gwynedd to Dolgellau is roughly 35 miles — all part of the Gwynedd area we cover.

If you're just outside Dolgellau, we also cover Machynlleth (11 miles), Porthmadog (16 miles), Aberystwyth (24 miles).

How much should it cost?

Guide price, per lantern£395–£1,295 ex VAT£474–£1,554 inc VAT

Most upstand and kerb repairs jobs come in between £395 and £1,295 ex VAT (£474–£1,554 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?

  1. Send photosWhatsApp or upload a few photos and tell us when it leaks.
  2. Guide priceWe reply with a guide price and whether a visit is needed.
  3. Fixed price in writingYou approve the price and the date before anything starts.
  4. Repair and testWe fix what's failed, water-test where it matters, and send photos.

Upstand and kerb repairs in Dolgellau: questions

How do I get a price for upstand and kerb repairs in Dolgellau?

Send a few photos of the lantern and the problem, with your Dolgellau postcode. We'll reply with a guide price and tell you whether a visit is needed before we can fix the price.

Which places near Dolgellau do you cover?

As well as Dolgellau, we cover nearby Machynlleth, Porthmadog, Aberystwyth, Pwllheli and the rest of Gwynedd.

How much does an upstand repair cost?

Typically £395–£1,295 ex VAT depending on size, timber condition and the roof covering. The fixed price is confirmed in writing before work starts.

Can you add insulation to the kerb?

Yes. Insulated kerbs reduce cold bridging and help with condensation around the opening.

Other lantern repairs in Dolgellau

Upstand and kerb repairs near Dolgellau

More about upstand and kerb repairs · All roof lantern repairs in Dolgellau

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