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Gwynedd · LL49

Glazing bar and capping repairs in Porthmadog

Dealing with a lifted capping or perished gasket in Porthmadog (LL49)? We re-seat or replace lifted cappings, perished gaskets and loose glazing bar fixings, with a fixed price agreed in writing first.

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We carry out glazing bar and capping repairs in Porthmadog and across the LL49 area. Each glazing bar on a roof lantern has a top capping that clamps the glass onto gaskets.

Roof lantern glazing bar with the top capping lifted to show the gasket beneath

Is it time for glazing bar and capping repairs?

  • A capping visibly higher than its neighbours
  • Rattling or whistling in wind
  • End caps missing at the bottom of a bar

What usually causes it?

Gasket shrinkage

Rubber gaskets shrink back from the ends over time, leaving a gap at the ridge or eaves.

Damage

Ladders, window cleaning or someone stepping on a lantern can bend a capping or unclip it.

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.

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.

Neighbouring places we cover include Pwllheli (12 miles), Caernarfon (16 miles), Dolgellau (16 miles).

Guide prices for glazing bar and capping repairs in Porthmadog

Guide price, per lantern£165–£395 ex VAT£198–£474 inc VAT

Guide price for glazing bar and capping repairs: £165–£395 ex VAT (£198–£474 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?

Most lantern repairs in Wales need no approval at all. Where a job turns into a replacement, the Building Regulations 2010 (as applied in Wales) apply and we confirm how the work will be signed off before we start. 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.

Glazing bar and capping repairs 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.

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.

How much do capping and gasket repairs cost?

Usually £165–£395 ex VAT per lantern depending on how many bars are affected, confirmed in writing before work starts.

Can a capping just be clipped back on?

Sometimes, if nothing underneath has failed. We check the gaskets first, because clipping a capping over a perished gasket doesn't stop the leak.

Other lantern repairs in Porthmadog

Glazing bar and capping repairs near Porthmadog

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