- Why is my roof lantern leaking?
A roof lantern usually leaks because water is getting past a failed seal, gasket or capping, through a cracked ridge end cap, or over a badl… - How much does a roof lantern repair cost in 2026?
In 2026 a typical UK roof lantern leak repair costs £195–£595 ex VAT and a full reseal £245–£495 ex VAT per lantern as a guide, while kerb r… - Should I repair or replace my roof lantern?
Repair is usually the right choice when the frame is sound and the problem lies in the seals, gaskets, cappings, glass units or drainage, be… - Why is my roof lantern glass misted, and can it be fixed?
Misting between the panes of a roof lantern means the sealed glass unit's edge seal has failed and moist air has got into the cavity between… - Why does my roof lantern get condensation?
Roof lantern condensation happens when warm, moist room air rises and meets the cooler glass and frame, which are usually the coldest surfac… - What does resealing a roof lantern involve?
Resealing a roof lantern means cutting out the old, failed sealant along the ridge, hips, bars and eaves, renewing worn gaskets and cappings… - Is my roof lantern upstand or kerb leaking?
A roof lantern upstand or kerb is leaking when water gets past the flat roof covering where it turns up the kerb, or between the top of the … - Do I need building regulations approval to replace a roof lantern?
Replacing a whole roof lantern is usually building work that must meet the building regulations, while repairs and glass-only replacement in… - Should roof lantern glass be laminated or toughened?
For the inner pane of a roof lantern, laminated glass is the safer choice because it stays in one piece if it breaks, and the Rooflight Asso… - How do I maintain a roof lantern?
Maintaining a roof lantern means keeping its glass clean, its drainage clear and its seals, gaskets, cappings and vents in good working orde… - How do repairs differ for aluminium, uPVC and timber roof lanterns?
All roof lanterns share the same basic parts, but each frame material fails in its own way: aluminium usually needs seals, cappings and fini… - Why has a glass panel slipped in my roof lantern?
A roof lantern glass panel slips when whatever holds it at the foot of the slope, usually setting blocks and an end stop at the eaves, is mi… - My roof lantern makes the room too hot — what can I do?
A roof lantern makes a room too hot because it lets in a lot of direct sunlight from overhead for much of the day, and the heat that builds … - What should I do if my roof lantern leaks in a storm?
If your roof lantern leaks in a storm, stay off the roof and deal with it from inside: catch and contain the water, keep it away from electr… - Is it the flat roof or the roof lantern that's leaking?
A leak near a roof lantern can come from the lantern, the kerb junction where the flat roof meets it, or the flat roof itself some distance … - Why won't my electric roof lantern vent open or close?
An electric roof lantern vent usually won't open or close because of a power or control problem, a rain sensor telling it to stay shut, or a…
Guides
Roof lantern guides
Straight answers to common roof lantern questions, from leaks and condensation to costs and the rules.
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