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Northern Ireland · County Londonderry

Flat roof junction and flashing repairs in County Londonderry

We provide flat roof junction and flashing repairs across County Londonderry, from Derry~Londonderry, Coleraine, Limavady. We re-make the membrane, trims and flashing where the flat roof meets the lantern kerb, and you get a fixed price in writing before any work starts.

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The junction where the flat roof covering meets the lantern kerb is a weak point on many extensions. We carry out flat roof junction and flashing repairs across County Londonderry, with a guide price from your photos and a fixed price in writing before any work starts.

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

Signs you need flat roof junction and flashing repairs

  • 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

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 County Londonderry

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.

What should you expect to pay for flat roof junction and flashing repairs in County Londonderry?

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 Northern Ireland?

Most lantern repairs in Northern Ireland need no approval at all. Where a job turns into a replacement, the Building Regulations (Northern Ireland) 2012 apply and we confirm how the work will be signed off before we start. Listed buildings in Northern Ireland need listed building consent from the council for alterations; check with the council's planning service before changing a lantern on a listed property.

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 County Londonderry: questions

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.

Which towns in County Londonderry do you cover?

All of County Londonderry, including Derry~Londonderry, Coleraine, Limavady, Magherafelt, Portstewart. Rural and remote addresses are covered by arrangement.

How do I get a price for flat roof junction and flashing repairs in County Londonderry?

Send a few photos of the lantern and the problem with your postcode, by WhatsApp or the form. We reply with a guide price and confirm the fixed price in writing before any work starts.

Other repairs in County Londonderry

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

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