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South Glamorgan · CF10

Flat roof junction and flashing repairs in Cardiff

We cover Cardiff and the wider South Glamorgan area for flat roof junction and flashing repairs. In short, we re-make the membrane, trims and flashing where the flat roof meets the lantern kerb — and you know the price before any work begins.

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The junction where the flat roof covering meets the lantern kerb is a weak point on many extensions. Send photos from Cardiff (CF10) and we'll tell you which it is — with the price agreed in writing before any work.

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

Is it time for flat roof junction and flashing repairs?

  • Splits, blisters or lifted edges in the roof covering by the kerb
  • Missing or loose edge trims and flashings
  • Ponding on the roof next to the lantern

What usually causes it?

Cracked GRP

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

Missing trims

Without a trim or flashing to protect the top edge, water gets in behind the membrane.

Covering Cardiff and nearby

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.

We also cover nearby Penarth (3 miles), Caerphilly (7 miles), Barry (7 miles).

What should you expect to pay in Cardiff?

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 Cardiff: questions

Do you need to visit to price flat roof junction and flashing repairs?

Not always. Clear photos are often enough for a guide price. Where the cause isn't obvious, a visit to inspect and water-test is charged from £145 ex VAT, confirmed before we come.

Which places near Cardiff do you cover?

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

What does a junction repair cost?

Usually £245–£695 ex VAT, confirmed in writing before work starts.

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 Cardiff

Flat roof junction and flashing repairs near Cardiff

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

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