Each glazing bar on a roof lantern has a top capping that clamps the glass onto gaskets. We carry out glazing bar and capping repairs across Powys, with a guide price from your photos and a fixed price in writing before any work starts.

Signs you need glazing bar and capping repairs
- A capping visibly higher than its neighbours
- Rattling or whistling in wind
- End caps missing at the bottom of a bar
What usually causes it?
Gasket shrinkage
Rubber gaskets shrink back from the ends over time, leaving a gap at the ridge or eaves.
Damage
Ladders, window cleaning or someone stepping on a lantern can bend a capping or unclip it.
Roof lanterns in Powys
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 glazing bar and capping repairs in Powys?
Most glazing bar and capping repairs jobs come in between £165 and £395 ex VAT (£198–£474 including 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 Wales?
In Wales, like-for-like repairs to a roof lantern don't usually involve building control. A full replacement or a bigger opening is controlled under the Building Regulations 2010 (as applied in Wales), so we set out the route in writing first. 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.
Glazing bar and capping repairs in Powys: questions
How much do capping and gasket repairs cost?
Usually £165–£395 ex VAT per lantern depending on how many bars are affected, confirmed in writing before work starts.
Can a capping just be clipped back on?
Sometimes, if nothing underneath has failed. We check the gaskets first, because clipping a capping over a perished gasket doesn't stop the leak.
Which towns in Powys do you cover?
All of Powys, including Newtown, Brecon, Llandrindod Wells, Machynlleth, Welshpool, Ystradgynlais. Rural and remote addresses are covered by arrangement.
How do I get a price for glazing bar and capping repairs in Powys?
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 Powys
- Roof lantern leak repairs in Powys
- Cracked lantern glass replacement in Powys
- Condensation diagnosis and fixes in Powys
- Aluminium roof lantern repairs in Powys
- Opening vent and actuator repairs in Powys
- Leak investigation and inspection in Powys
Nearby areas
- Glazing bar and capping repairs in Gwent
- Glazing bar and capping repairs in Mid Glamorgan
- Glazing bar and capping repairs in West Glamorgan
- Glazing bar and capping repairs in Dyfed
- Glazing bar and capping repairs in South Glamorgan
More about glazing bar and capping repairs · All roof lantern repairs in Powys