A cracked pane in a roof lantern needs prompt attention because the glass is overhead. Send photos from Cardiff (CF10) and we'll tell you which it is — with the price agreed in writing before any work.
What you might be seeing
- A visible crack in the outer or inner pane
- A starburst from an impact point
- Broken glass inside the room — keep everyone out of the area
Common causes we find
Thermal stress
Uneven heating across a pane, edge damage or partial shading can crack glass from the edge.
Spontaneous breakage
Toughened glass can occasionally break without warning, which is why laminated inner panes are recommended overhead.
Roof lanterns in Cardiff
Western and upland parts of the UK get more rain and more wind-driven rain than the east, and that's what finds weak cappings and blocked eaves first. Lanterns here benefit from a check of the bars on the most exposed face and a clear eaves channel before winter.
Close by, we also cover Penarth (3 miles), Caerphilly (7 miles), Barry (7 miles).
What should you expect to pay in Cardiff?
Guide price for cracked lantern glass replacement: £295–£795 ex VAT (£354–£954 inc VAT), per glass unit. 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 Wales?
Most lantern repairs in Wales need no approval at all. Where a job turns into a replacement, the Building Regulations 2010 (as applied in Wales) apply and we confirm how the work will be signed off before we start. Listed buildings in Wales need listed building consent from the local planning authority for alterations, with Cadw guidance on historic buildings; check with the council 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.
Cracked lantern glass replacement in Cardiff: questions
Do you cover Cardiff?
Yes. We cover Cardiff, including the CF10 postcode area, as part of South Glamorgan. Send photos by WhatsApp or the form for a free guide price, and we'll confirm the fixed price in writing before any work starts.
Which places near Cardiff do you cover?
As well as Cardiff, we cover nearby Penarth, Caerphilly, Barry, Risca and the rest of South Glamorgan.
Is it covered by home insurance?
Accidental damage often is; check your policy. We can provide a written quote and photos for your insurer.
Why did my glass crack on a sunny day?
Thermal stress — one part of the pane heats faster than another, often where it's shaded or chipped at the edge.
Other lantern repairs in Cardiff
- Glazing bar and capping repairs in Cardiff
- Upstand and kerb repairs in Cardiff
- Flat roof junction and flashing repairs in Cardiff
- Slipped glass panel repairs in Cardiff
- Opening vent and actuator repairs in Cardiff
- Commercial roof lantern repairs in Cardiff
Cracked lantern glass replacement near Cardiff
More about cracked lantern glass replacement · All roof lantern repairs in Cardiff