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South Glamorgan · CF64

Flat roof junction and flashing repairs in Penarth

For flat roof junction and flashing repairs in Penarth, the job is simple to describe: we re-make the membrane, trims and flashing where the flat roof meets the lantern kerb. Photos first, a guide price back, then a written fixed price.

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In Penarth, as everywhere, the junction where the flat roof covering meets the lantern kerb is a weak point on many extensions. Send photos and we'll tell you what we think has failed.

Newly trimmed flat roof junction and flashing tape around a roof lantern kerb

Is it time for flat roof junction and flashing repairs?

  • Leak near the lantern but not from the frame
  • Splits, blisters or lifted edges in the roof covering by the kerb
  • Ponding on the roof next to the lantern

Common causes we find

Unbonded membrane

EPDM or single-ply that has come away from the kerb lets water run behind it.

Cracked GRP

Fibreglass roofs can crack at the kerb corner where movement concentrates.

Roof lanterns in Penarth

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.

From Cardiff to Penarth is roughly 3 miles — all part of the South Glamorgan area we cover.

Neighbouring places we cover include Cardiff (3 miles), Barry (5 miles), Caerphilly (10 miles).

Guide prices for flat roof junction and flashing repairs in Penarth

Guide price, per lantern£245–£695 ex VAT£294–£834 inc VAT

Typical range: £245–£695 ex VAT, which is £294–£834 with 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?

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.

Flat roof junction and flashing repairs in Penarth: questions

Do you cover Penarth?

Yes. We cover Penarth, including the CF64 postcode area, as part of South Glamorgan. 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.

Which places near Penarth do you cover?

As well as Penarth, we cover nearby Cardiff, Barry, Caerphilly, Cowbridge and the rest of South Glamorgan.

Do you repair the whole flat roof?

We repair the area around the lantern. If the wider roof is failing we'll tell you and can quote, but we won't push a new roof if a local repair will do.

Can you repair a GRP roof without it showing?

Repairs are colour-matched as closely as possible, but new topcoat next to weathered topcoat can look slightly different at first.

Other lantern repairs in Penarth

Flat roof junction and flashing repairs near Penarth

More about flat roof junction and flashing repairs · All roof lantern repairs in Penarth

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