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Mid Glamorgan · CF42

Flat roof junction and flashing repairs in Rhondda

We cover Rhondda and the wider Mid 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 Rhondda (CF42) 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

What you might be seeing

  • 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

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 Rhondda and nearby

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 Bridgend to Rhondda is roughly 12 miles — all part of the Mid Glamorgan area we cover.

If you're just outside Rhondda, we also cover Tonypandy (3 miles), Aberdare (4 miles), Pontypridd (6 miles).

Guide prices for flat roof junction and flashing repairs in Rhondda

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?

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.

Flat roof junction and flashing repairs in Rhondda: 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 Rhondda do you cover?

As well as Rhondda, we cover nearby Tonypandy, Aberdare, Pontypridd, Merthyr Tydfil and the rest of Mid 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 Rhondda

Flat roof junction and flashing repairs near Rhondda

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

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