Resealing is the planned, whole-lantern version of a leak repair: we cut out the old, failed sealant, clean every joint back to a sound surface and reseal the cappings, ridge and eaves with materials that suit the frame. Send photos from Letchworth Garden City (SG6) and we'll tell you which it is — with the price agreed in writing before any work.
Is it time for roof lantern resealing?
- Cracked, split or shrunken sealant along the bars
- Black mould or dirt lines trapped in old silicone
- Several small leaks rather than one obvious one
Why it happens
Sealant past its life
Exposed sealant on a roof takes UV, frost and constant expansion and contraction. It hardens, loses grip and pulls away from the glass.
Patch over patch
Fresh sealant run over old, dirty sealant rarely bonds. It looks fixed for a season and then lets go.
Covering Letchworth Garden City and nearby
Lanterns in central England see a bit of everything — summer sun that ages seals and end caps, autumn leaf fall that blocks eaves, and frosty mornings that bring condensation. A yearly check covers all three.
From St Albans to Letchworth Garden City is roughly 16 miles — all part of the Hertfordshire area we cover.
We also cover nearby Hitchin (3 miles), Stevenage (5 miles), Luton (11 miles).
How much should it cost?
Most roof lantern resealing jobs come in between £245 and £495 ex VAT (£294–£594 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 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.
Roof lantern resealing in Letchworth Garden City: questions
Do you cover Letchworth Garden City?
Yes. We cover Letchworth Garden City, including the SG6 postcode area, as part of Hertfordshire. 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 Letchworth Garden City do you cover?
As well as Letchworth Garden City, we cover nearby Hitchin, Stevenage, Luton, Ampthill and the rest of Hertfordshire.
How much does it cost to reseal a roof lantern?
A standard-size lantern on a single-storey extension is usually £245–£495 ex VAT. Larger lanterns, difficult access or gasket replacement add to that, and you get the fixed price in writing first.
How long does resealing take?
Most domestic lanterns take a few hours in dry weather.
Other lantern repairs in Letchworth Garden City
- uPVC roof lantern repairs in Letchworth Garden City
- Opening vent and actuator repairs in Letchworth Garden City
- Roof lantern respraying in Letchworth Garden City
- Cleaning and maintenance in Letchworth Garden City
- Orangery lantern repairs in Letchworth Garden City
- Commercial roof lantern repairs in Letchworth Garden City
Roof lantern resealing near Letchworth Garden City
More about roof lantern resealing · All roof lantern repairs in Letchworth Garden City