We carry out flat roof junction and flashing repairs in Gorseinon and across the SA4 area. The junction where the flat roof covering meets the lantern kerb is a weak point on many extensions.

Is it time for flat roof junction and flashing repairs?
- Leak near the lantern but not from the frame
- Missing or loose edge trims and flashings
- Ponding on the roof next to the lantern
What usually causes it?
Unbonded membrane
EPDM or single-ply that has come away from the kerb lets water run behind it.
Missing trims
Without a trim or flashing to protect the top edge, water gets in behind the membrane.
About Gorseinon and the SA4 area
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.
We cover Gorseinon as part of West Glamorgan, about 5 miles from Swansea.
We also cover nearby Llanelli (5 miles), Swansea (5 miles), Ammanford (9 miles).
Guide prices for flat roof junction and flashing repairs in Gorseinon
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?
- 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.
Flat roof junction and flashing repairs in Gorseinon: 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 Gorseinon do you cover?
As well as Gorseinon, we cover nearby Llanelli, Swansea, Ammanford, Neath and the rest of West 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 Gorseinon
- Eaves beam and gutter repairs in Gorseinon
- Aluminium roof lantern repairs in Gorseinon
- uPVC roof lantern repairs in Gorseinon
- Opening vent and actuator repairs in Gorseinon
- Leak investigation and inspection in Gorseinon
- Commercial roof lantern repairs in Gorseinon
Flat roof junction and flashing repairs near Gorseinon
More about flat roof junction and flashing repairs · All roof lantern repairs in Gorseinon