Condensation forms when warm, humid air meets a cold surface — and a roof lantern is the coldest surface in many kitchens. Send photos from Swindon (SN1) and we'll tell you which it is — with the price agreed in writing before any work.

Signs you need condensation diagnosis and fixes
- Water on the inside of the glass on cold mornings, even without rain
- Drips after cooking, showers or drying clothes
- Black mould at the base of the lantern lining
What usually causes it?
High humidity
Cooking, kettles, showers, drying washing and people all add moisture to the air.
Poor ventilation
Without trickle vents, extraction or an opening vent, moist air has nowhere to go.
Roof lanterns in Swindon
Most inland lantern leaks aren't storm damage; they're usually tired sealant, a lifted capping or blocked eaves drainage. All three are quick to find and fix once you know where to look.
If you're just outside Swindon, we also cover Cirencester (14 miles), Chippenham (16 miles), Witney (20 miles).
How much should it cost?
Typical range: £145–£495 ex VAT, which is £174–£594 with VAT, per visit. 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.
Condensation diagnosis and fixes in Swindon: questions
How do I get a price for condensation diagnosis and fixes in Swindon?
Send a few photos of the lantern and the problem, with your Swindon 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 Swindon do you cover?
As well as Swindon, we cover nearby Cirencester, Chippenham, Witney, Stroud and the rest of Wiltshire.
Will new glass stop condensation?
Better glass raises the inner surface temperature and helps, but if the room is very humid, ventilation matters more. We'll tell you which will make the bigger difference.
What does a condensation visit cost?
Diagnosis visits start from £145 ex VAT. Any fixes are priced separately and confirmed in writing before work starts.
Other lantern repairs in Swindon
- Roof lantern leak repairs in Swindon
- Glazing bar and capping repairs in Swindon
- Eaves beam and gutter repairs in Swindon
- Slipped glass panel repairs in Swindon
- uPVC roof lantern repairs in Swindon
- Roof lantern replacement in Swindon
Condensation diagnosis and fixes near Swindon
More about condensation diagnosis and fixes · All roof lantern repairs in Swindon