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Greater London · DA5

Flat roof junction and flashing repairs in Bexley

If you're in Bexley and dealing with a leak where the roof meets the lantern, we can help. We re-make the membrane, trims and flashing where the flat roof meets the lantern kerb, and confirm the fixed price in writing before we start.

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We carry out flat roof junction and flashing repairs in Bexley and across the DA5 area. The junction where the flat roof covering meets the lantern kerb is a weak point on many extensions.

Newly trimmed flat roof junction and flashing tape around a roof lantern kerb

Signs you need 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

Common causes we find

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.

Covering Bexley and nearby

Sun and UV do more damage than rain on many lanterns here: brittle ridge caps, chalky finishes and hardened gaskets. They're cheap to replace before they let water in.

Across London, many lanterns sit on rear extensions with access only through the house, so we protect floors and plan the work to keep time indoors to a minimum. Parking and any permits are factored into the quote.

We cover Bexley as part of Greater London, about 13 miles from Westminster.

If you're just outside Bexley, we also cover Welling (2 miles), Dartford (3 miles), Swanley (3 miles).

How much should it cost?

Guide price, per lantern£245–£695 ex VAT£294–£834 inc VAT

Guide price for flat roof junction and flashing repairs: £245–£695 ex VAT (£294–£834 inc 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?

  1. Send photosWhatsApp or upload a few photos and tell us when it leaks.
  2. Guide priceWe reply with a guide price and whether a visit is needed.
  3. Fixed price in writingYou approve the price and the date before anything starts.
  4. Repair and testWe fix what's failed, water-test where it matters, and send photos.

Flat roof junction and flashing repairs in Bexley: questions

Can you repair a lantern someone else installed in Bexley?

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.

Which places near Bexley do you cover?

As well as Bexley, we cover nearby Welling, Dartford, Swanley, Eltham and the rest of Greater London.

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.

What does a junction repair cost?

Usually £245–£695 ex VAT, confirmed in writing before work starts.

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Flat roof junction and flashing repairs near Bexley

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