We carry out flat roof junction and flashing repairs in Didcot and across the OX11 area. The junction where the flat roof covering meets the lantern kerb is a weak point on many extensions.

What you might be seeing
- Splits, blisters or lifted edges in the roof covering by the kerb
- Missing or loose edge trims and flashings
- Ponding on the roof next to the lantern
Common causes we find
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 Didcot and nearby
Most inland lantern leaks aren't storm damage; they're usually tired sealant, a lifted capping or blocked eaves drainage. All three are quick to find and fix once you know where to look.
We cover Didcot as part of Oxfordshire, about 10 miles from Oxford.
Neighbouring places we cover include Abingdon (5 miles), Oxford (10 miles), Thatcham (14 miles).
What should you expect to pay in Didcot?
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?
In England, 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, so we set out the route in writing first. 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 Didcot: questions
Do you cover Didcot?
Yes. We cover Didcot, including the OX11 postcode area, as part of Oxfordshire. 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.
Which places near Didcot do you cover?
As well as Didcot, we cover nearby Abingdon, Oxford, Thatcham, Newbury and the rest of Oxfordshire.
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 Didcot
- Glazing bar and capping repairs in Didcot
- Cracked lantern glass replacement in Didcot
- Solar control and self-cleaning glass upgrades in Didcot
- Timber roof lantern repairs in Didcot
- Roof lantern respraying in Didcot
- Urgent leak make-safe in Didcot
Flat roof junction and flashing repairs near Didcot
More about flat roof junction and flashing repairs · All roof lantern repairs in Didcot