In Johnstone, 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.
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
- Missing or loose edge trims and flashings
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.
Roof lanterns in Johnstone
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.
Urban grime and traffic film dull glass and frames quickly; a clean and seal check makes a tired lantern look and perform much better.
Johnstone is around 10 miles from Glasgow, and both are within our Glasgow and Clyde coverage.
If you're just outside Johnstone, we also cover Paisley (3 miles), Renfrew (6 miles), Clydebank (7 miles).
How much should it cost?
Most flat roof junction and flashing repairs jobs come in between £245 and £695 ex VAT (£294–£834 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 Scotland?
In Scotland, 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 (Scotland) Regulations 2004, so we set out the route in writing first. Listed buildings in Scotland need listed building consent from the planning authority for alterations, with Historic Environment Scotland guidance; check 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 Johnstone: questions
How do I get a price for flat roof junction and flashing repairs in Johnstone?
Send a few photos of the lantern and the problem, with your Johnstone postcode. We'll reply with a guide price and tell you whether a visit is needed before we can fix the price.
Which places near Johnstone do you cover?
As well as Johnstone, we cover nearby Paisley, Renfrew, Clydebank, Newton Mearns and the rest of Glasgow and Clyde.
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 Johnstone
- Eaves beam and gutter repairs in Johnstone
- uPVC roof lantern repairs in Johnstone
- Roof lantern respraying in Johnstone
- Flat rooflight and skylight repairs in Johnstone
- Cleaning and maintenance in Johnstone
- Orangery lantern repairs in Johnstone
Flat roof junction and flashing repairs near Johnstone
More about flat roof junction and flashing repairs · All roof lantern repairs in Johnstone