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Kent · DA1

Flat roof junction and flashing repairs in Dartford

We cover Dartford and the wider Kent area for flat roof junction and flashing repairs. In short, we re-make the membrane, trims and flashing where the flat roof meets the lantern kerb — and you know the price before any work begins.

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In Dartford, 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.

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

What usually causes it?

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.

Roof lanterns in Dartford

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.

Coastal wind drives rain hard against lanterns, so cappings and ridge seals on the seaward face take the most punishment.

We cover Dartford as part of Kent, about 18 miles from Maidstone.

We also cover nearby Bexley (3 miles), Swanley (4 miles), Welling (5 miles).

How much should it cost?

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

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 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 Dartford: questions

Do you need to visit to price flat roof junction and flashing repairs?

Not always. Clear photos are often enough for a guide price. Where the cause isn't obvious, a visit to inspect and water-test is charged from £145 ex VAT, confirmed before we come.

Which places near Dartford do you cover?

As well as Dartford, we cover nearby Bexley, Swanley, Welling, South Ockendon and the rest of Kent.

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 Dartford

Flat roof junction and flashing repairs near Dartford

More about flat roof junction and flashing repairs · All roof lantern repairs in Dartford

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