Each glazing bar on a roof lantern has a top capping that clamps the glass onto gaskets. Send photos from Harrow (HA2) and we'll tell you which it is — with the price agreed in writing before any work.
Signs you need glazing bar and capping repairs
- A capping visibly higher than its neighbours
- Water running down one glazing bar inside
- End caps missing at the bottom of a bar
Why it happens
Gasket shrinkage
Rubber gaskets shrink back from the ends over time, leaving a gap at the ridge or eaves.
Fixings working loose
Screws and clips that hold the capping relax with thermal movement, so the clamp on the glass weakens.
About Harrow and the HA2 area
Drier, sunnier parts of the UK are kinder to seals than the wet west, but strong sun ages sealant, gaskets and plastic end caps, and south- or west-facing lanterns can make rooms very warm. Solar control glass and an opening vent help.
London's extensions are often tight to neighbouring walls and roofs. Where a repair needs access over a neighbour's property, we'll tell you in advance so you can arrange it.
We cover Harrow as part of Greater London, about 10 miles from Westminster.
We also cover nearby Wembley (2 miles), Northolt (3 miles), Greenford (4 miles).
What should you expect to pay in Harrow?
Guide price for glazing bar and capping repairs: £165–£395 ex VAT (£198–£474 inc 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 England?
Most lantern repairs in England need no approval at all. Where a job turns into a replacement, the Building Regulations 2010 apply and we confirm how the work will be signed off before we start. Listed buildings need listed building consent from the local council for alterations, and conservation areas can have extra controls; like-for-like repairs are treated differently from changes, so check with the council's conservation officer first.
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 Harrow: questions
How do I get a price for glazing bar and capping repairs in Harrow?
Send a few photos of the lantern and the problem, with your Harrow postcode. We'll reply with a guide price and tell you whether a visit is needed before we can fix the price.
Which places near Harrow do you cover?
As well as Harrow, we cover nearby Wembley, Northolt, Greenford, Ruislip and the rest of Greater London.
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.
Other lantern repairs in Harrow
- Eaves beam and gutter repairs in Harrow
- Upstand and kerb repairs in Harrow
- Flat roof junction and flashing repairs in Harrow
- Roof lantern respraying in Harrow
- Cleaning and maintenance in Harrow
- Orangery lantern repairs in Harrow
Glazing bar and capping repairs near Harrow
More about glazing bar and capping repairs · All roof lantern repairs in Harrow