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Gwynedd · LL55

Condensation diagnosis and fixes in Caernarfon

Dealing with condensation dripping from the lantern in Caernarfon (LL55)? We work out whether it's condensation or a leak, then fix the cause — ventilation, kerb or glass, with a fixed price agreed in writing first.

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Condensation forms when warm, humid air meets a cold surface — and a roof lantern is the coldest surface in many kitchens. Send photos from Caernarfon (LL55) and we'll tell you which it is — with the price agreed in writing before any work.

Condensation droplets on the inside of roof lantern glass on a cold morning

What you might be seeing

  • Drips after cooking, showers or drying clothes
  • Black mould at the base of the lantern lining
  • Wet window sills elsewhere in the house too

Common causes we find

High humidity

Cooking, kettles, showers, drying washing and people all add moisture to the air.

Poor ventilation

Without trickle vents, extraction or an opening vent, moist air has nowhere to go.

Roof lanterns in Caernarfon

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.

From Bangor, Gwynedd to Caernarfon is roughly 8 miles — all part of the Gwynedd area we cover.

If you're just outside Caernarfon, we also cover Llangefni (8 miles), Bangor, Gwynedd (8 miles), Porthmadog (16 miles).

Guide prices for condensation diagnosis and fixes in Caernarfon

Guide price, per visit£145–£495 ex VAT£174–£594 inc VAT

Guide price for condensation diagnosis and fixes: £145–£495 ex VAT (£174–£594 inc VAT), per visit. 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?

In Wales, like-for-like repairs to a roof lantern don't usually involve building control. A full replacement or a bigger opening is controlled under the Building Regulations 2010 (as applied in Wales), so we set out the route in writing first. 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.

Condensation diagnosis and fixes in Caernarfon: questions

How do I get a price for condensation diagnosis and fixes in Caernarfon?

Send a few photos of the lantern and the problem, with your Caernarfon 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 Caernarfon do you cover?

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

What does a condensation visit cost?

Diagnosis visits start from £145 ex VAT. Any fixes are priced separately and confirmed in writing before work starts.

Is condensation in a lantern normal?

Occasional light condensation on very cold mornings can be. Regular dripping isn't, and can damage linings and cause mould.

Other lantern repairs in Caernarfon

Condensation diagnosis and fixes near Caernarfon

More about condensation diagnosis and fixes · All roof lantern repairs in Caernarfon

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