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Gwynedd · LL49

Aluminium roof lantern repairs in Porthmadog

For aluminium roof lantern repairs in Porthmadog, the job is simple to describe: we replace worn gaskets, cappings, end caps and fixings and touch in the finish on aluminium lanterns. Photos first, a guide price back, then a written fixed price.

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In Porthmadog, as everywhere, aluminium lanterns are strong and slim, but they still rely on gaskets, cappings and seals that wear. Send photos and we'll tell you what we think has failed.

Slim-profile anthracite grey aluminium roof lantern on a modern flat roof extension

Signs you need aluminium roof lantern repairs

  • Leaks at bars or ridge
  • Cappings lifted or rattling
  • Corrosion at cut edges or fixings in coastal areas

Common causes we find

Worn gaskets

Gaskets do the weatherproofing; they harden and shrink with age.

Thermal movement

Aluminium moves with temperature; seals and fixings take the strain.

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 aluminium roof lantern repairs in Porthmadog

Guide price, per lantern£195–£695 ex VAT£234–£834 inc VAT

Most aluminium roof lantern repairs jobs come in between £195 and £695 ex VAT (£234–£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?

  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.

Aluminium roof lantern repairs in Porthmadog: questions

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.

Which places near Porthmadog do you cover?

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

Can you repaint an aluminium lantern?

Yes — see roof lantern respraying for on-site spray finishes.

My lantern brand is unknown — can you still help?

Usually. Many systems share common parts, and where they don't we adapt the detail.

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