Roof lantern resealing in Powys | Roof Lantern Repairs

Resealing is the planned, whole-lantern version of a leak repair: we cut out the old, failed sealant, clean every joint back to a sound surface and reseal the cappings, ridge and eaves with materials that suit the frame. We carry out roof lantern resealing across Powys, with a guide price from your photos and a fixed price in writing before any work starts.

Sealant being applied along an anthracite aluminium roof lantern glazing bar

Signs you need roof lantern resealing

Black mould or dirt lines trapped in old silicone
Several small leaks rather than one obvious one
A lantern that is 8–15 years old and has never been maintained

What usually causes it?

Wrong product used

General-purpose or acetoxy silicone can fail early on some frames and coatings. Glazing joints need a low-modulus, compatible sealant.

Patch over patch

Fresh sealant run over old, dirty sealant rarely bonds. It looks fixed for a season and then lets go.

Roof lanterns in Powys

Western and upland parts of the UK get more rain and more wind-driven rain than the east, and that's what finds weak cappings and blocked eaves first. Lanterns here benefit from a check of the bars on the most exposed face and a clear eaves channel before winter.

What should you expect to pay for roof lantern resealing in Powys?

Guide price, per lantern£245–£495 ex VAT£294–£594 inc VAT

Most roof lantern resealing jobs come in between £245 and £495 ex VAT (£294–£594 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.

Roof lantern resealing in Powys: questions

How much does it cost to reseal a roof lantern?

A standard-size lantern on a single-storey extension is usually £245–£495 ex VAT. Larger lanterns, difficult access or gasket replacement add to that, and you get the fixed price in writing first.

Can you match the colour of my frame?

We use sealants in common frame colours such as anthracite grey, black and white, and match as closely as the range allows.

Which towns in Powys do you cover?

All of Powys, including Newtown, Brecon, Llandrindod Wells, Machynlleth, Welshpool, Ystradgynlais. Rural and remote addresses are covered by arrangement.

How do I get a price for roof lantern resealing in Powys?

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.

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