Flat rooflights fail in the same places as lanterns: the seal to the upstand, the roof junction and the glass unit. Send photos from Derry~Londonderry (BT47) and we'll tell you which it is — with the price agreed in writing before any work.
Is it time for flat rooflight and skylight repairs?
- Misted glass
- Ponding on the glass (not enough fall)
- Cracked sealant or a lifted membrane at the upstand
Why it happens
No fall
Flat glass needs a slight fall to shed water; ponding stresses seals.
Unit failure
Edge seals fail and the unit mists.
About Derry~Londonderry and the BT47 area
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.
Close by, we also cover Strabane (14 miles), Limavady (15 miles), Portstewart (27 miles).
Guide prices for flat rooflight and skylight repairs in Derry~Londonderry
Most flat rooflight and skylight repairs jobs come in between £195 and £595 ex VAT (£234–£714 including VAT), per rooflight. 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?
- 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 rooflight and skylight repairs in Derry~Londonderry: questions
How do I get a price for flat rooflight and skylight repairs in Derry~Londonderry?
Send a few photos of the lantern and the problem, with your Derry~Londonderry postcode. We'll reply with a guide price and tell you whether a visit is needed before we can fix the price.
Can you repair a lantern someone else installed in Derry~Londonderry?
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.
What does a flat rooflight repair cost?
Usually £195–£595 ex VAT, confirmed in writing before work starts.
Can you fix a Velux-style roof window?
Our focus is flat rooflights and lanterns; pitched roof windows are a different trade and we'll say so if that's what you have.
Other lantern repairs in Derry~Londonderry
- Roof lantern leak repairs in Derry~Londonderry
- Glazing bar and capping repairs in Derry~Londonderry
- Flat roof junction and flashing repairs in Derry~Londonderry
- Misted glass unit replacement in Derry~Londonderry
- Aluminium roof lantern repairs in Derry~Londonderry
- Cleaning and maintenance in Derry~Londonderry
Flat rooflight and skylight repairs near Derry~Londonderry
More about flat rooflight and skylight repairs · All roof lantern repairs in Derry~Londonderry