We carry out flat roof junction and flashing repairs in Westminster and across the SW1P area. The junction where the flat roof covering meets the lantern kerb is a weak point on many extensions.
Signs you need 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?
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 Westminster and the SW1P area
Even in drier areas, one heavy downpour with blocked eaves is enough to overflow a lantern indoors. Clearing the eaves channel is the simplest prevention there is.
London's extensions are often tight to neighbouring walls and roofs. Where a repair needs access over a neighbour's property, we'll tell you in advance so you can arrange it.
Neighbouring places we cover include Pimlico (1 mile), Chelsea (2 miles), Battersea (2 miles).
Guide prices for flat roof junction and flashing repairs in Westminster
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 England?
Straightforward repairs — resealing, gaskets, cappings, eaves and like-for-like parts — don't normally need building regulations approval in England. Replacing the whole lantern or enlarging the opening is different and falls under the Building Regulations 2010; we confirm in writing which route applies before any replacement. Listed buildings need listed building consent from the local council for alterations, and conservation areas can have extra controls; like-for-like repairs are treated differently from changes, so check with the council's conservation officer first.
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 Westminster: questions
How do I get a price for flat roof junction and flashing repairs in Westminster?
Send a few photos of the lantern and the problem, with your Westminster 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 Westminster do you cover?
As well as Westminster, we cover nearby Pimlico, Chelsea, Battersea, Brixton and the rest of Greater London.
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 Westminster
- Roof lantern leak repairs in Westminster
- Ridge and hip repairs in Westminster
- Eaves beam and gutter repairs in Westminster
- Opening vent and actuator repairs in Westminster
- Roof lantern respraying in Westminster
- Roof lantern replacement in Westminster
Flat roof junction and flashing repairs near Westminster
More about flat roof junction and flashing repairs · All roof lantern repairs in Westminster