We carry out flat rooflight and skylight repairs in Lisburn and across the BT27 area. Flat rooflights fail in the same places as lanterns: the seal to the upstand, the roof junction and the glass unit.
What you might be seeing
- Water around the rooflight edge
- Misted glass
- Cracked sealant or a lifted membrane at the upstand
What usually causes it?
No fall
Flat glass needs a slight fall to shed water; ponding stresses seals.
Upstand detail
As with lanterns, the membrane must be dressed up and sealed.
Covering Lisburn and nearby
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.
Coastal wind drives rain hard against lanterns, so cappings and ridge seals on the seaward face take the most punishment.
From Belfast to Lisburn is roughly 7 miles — all part of the County Antrim area we cover.
If you're just outside Lisburn, we also cover Belfast (7 miles), Newtownabbey (11 miles), Holywood (12 miles).
How much should it cost?
Typical range: £195–£595 ex VAT, which is £234–£714 with 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?
Straightforward repairs — resealing, gaskets, cappings, eaves and like-for-like parts — don't normally need building regulations approval in Northern Ireland. Replacing the whole lantern or enlarging the opening is different and falls under the Building Regulations (Northern Ireland) 2012; we confirm in writing which route applies before any replacement. 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 Lisburn: questions
Do you need to visit to price flat rooflight and skylight 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 Lisburn do you cover?
As well as Lisburn, we cover nearby Belfast, Newtownabbey, Holywood, Lurgan and the rest of County Antrim.
Do you replace walk-on rooflight glass?
Walk-on glass is a specialist structural unit; we can measure and specify a replacement from the right manufacturer.
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 Lisburn
- Ridge and hip repairs in Lisburn
- Eaves beam and gutter repairs in Lisburn
- Aluminium roof lantern repairs in Lisburn
- Roof lantern respraying in Lisburn
- Leak investigation and inspection in Lisburn
- Urgent leak make-safe in Lisburn
Flat rooflight and skylight repairs near Lisburn
More about flat rooflight and skylight repairs · All roof lantern repairs in Lisburn