The junction where the flat roof covering meets the lantern kerb is a weak point on many extensions. Send photos from Helensburgh (G84) and we'll tell you which it is — with the price agreed in writing before any work.
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
Why it happens
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.
About Helensburgh and the G84 area
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.
Coastal wind drives rain hard against lanterns, so cappings and ridge seals on the seaward face take the most punishment.
Helensburgh is around 40 miles from Oban, and both are within our Argyll and Bute coverage.
Close by, we also cover Greenock (4 miles), Dumbarton (7 miles), Dunoon (9 miles).
What should you expect to pay in Helensburgh?
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 Scotland?
Straightforward repairs — resealing, gaskets, cappings, eaves and like-for-like parts — don't normally need building regulations approval in Scotland. Replacing the whole lantern or enlarging the opening is different and falls under the Building (Scotland) Regulations 2004; we confirm in writing which route applies before any replacement. 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 Helensburgh: questions
Do you cover Helensburgh?
Yes. We cover Helensburgh, including the G84 postcode area, as part of Argyll and Bute. 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.
Can you repair a lantern someone else installed in Helensburgh?
Yes. We repair lanterns whoever fitted them. If yours is still under the installer's warranty, contact them first so you don't affect it.
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 Helensburgh
- Ridge and hip repairs in Helensburgh
- Cracked lantern glass replacement in Helensburgh
- Opening vent and actuator repairs in Helensburgh
- Flat rooflight and skylight repairs in Helensburgh
- Leak investigation and inspection in Helensburgh
- Cleaning and maintenance in Helensburgh
Flat roof junction and flashing repairs near Helensburgh
More about flat roof junction and flashing repairs · All roof lantern repairs in Helensburgh