Condensation forms when warm, humid air meets a cold surface — and a roof lantern is the coldest surface in many kitchens. We carry out condensation diagnosis and fixes across County Durham, with a guide price from your photos and a fixed price in writing before any work starts.

Signs you need condensation diagnosis and fixes
- Drips after cooking, showers or drying clothes
- Black mould at the base of the lantern lining
- Wet window sills elsewhere in the house too
What usually causes it?
High humidity
Cooking, kettles, showers, drying washing and people all add moisture to the air.
Cold surfaces
Older glass, uninsulated kerbs and un-thermally-broken frames stay cold and collect condensation.
Roof lanterns in County Durham
Snow and ice sitting at the eaves can block a lantern's drainage and push water back under the glass as it melts. If your lantern leaks after a thaw rather than after rain, tell us — it points to the eaves and kerb.
- Durham
- Darlington
- Hartlepool
- Stockton-on-Tees
- Chester-le-Street
- Billingham
- Stanley
- Consett
- Newton Aycliffe
- Bishop Auckland
- Seaham
- Peterlee
What should you expect to pay for condensation diagnosis and fixes in County Durham?
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?
Straightforward repairs — resealing, gaskets, cappings, eaves and like-for-like parts — don't normally need building regulations approval in England. Replacing the whole lantern or enlarging the opening is different and falls under the Building Regulations 2010; we confirm in writing which route applies before any replacement. 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 County Durham: questions
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.
Is condensation in a lantern normal?
Occasional light condensation on very cold mornings can be. Regular dripping isn't, and can damage linings and cause mould.
Which towns in County Durham do you cover?
All of County Durham, including Durham, Darlington, Hartlepool, Stockton-on-Tees, Chester-le-Street, Billingham. Rural and remote addresses are covered by arrangement.
How do I get a price for condensation diagnosis and fixes in County Durham?
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 County Durham
- Upstand and kerb repairs in County Durham
- Misted glass unit replacement in County Durham
- Timber roof lantern repairs in County Durham
- uPVC roof lantern repairs in County Durham
- Roof lantern respraying in County Durham
- Leak investigation and inspection in County Durham
Nearby areas
- Condensation diagnosis and fixes in Tyne and Wear
- Condensation diagnosis and fixes in Northumberland
- Condensation diagnosis and fixes in North Yorkshire
- Condensation diagnosis and fixes in Cumbria
- Condensation diagnosis and fixes in West Yorkshire
More about condensation diagnosis and fixes · All roof lantern repairs in County Durham