In Cardiff, as everywhere, most roof lantern leaks start as small, preventable problems: blocked eaves, a lifted capping, a tired seal. Send photos and we'll tell you what we think has failed.

What you might be seeing
- Leaves or moss at the eaves
- You've never had it checked
- The lantern is under trees
Common causes we find
Debris
Leaves and moss block drainage.
Unnoticed wear
Nobody looks at the roof until it leaks.
Covering Cardiff and nearby
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.
We also cover nearby Penarth (3 miles), Caerphilly (7 miles), Barry (7 miles).
How much should it cost?
Most cleaning and maintenance jobs come in between £95 and £245 ex VAT (£114–£294 including 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 Wales?
Straightforward repairs — resealing, gaskets, cappings, eaves and like-for-like parts — don't normally need building regulations approval in Wales. Replacing the whole lantern or enlarging the opening is different and falls under the Building Regulations 2010 (as applied in Wales); we confirm in writing which route applies before any replacement. 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.
Cleaning and maintenance in Cardiff: questions
Do you cover Cardiff?
Yes. We cover Cardiff, including the CF10 postcode area, as part of South Glamorgan. 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.
How do I get a price for cleaning and maintenance in Cardiff?
Send a few photos of the lantern and the problem, with your Cardiff postcode. We'll reply with a guide price and tell you whether a visit is needed before we can fix the price.
Do you clean the inside of the glass?
We can, where safe access from inside is possible; let us know when booking.
Can you set up regular visits?
Yes — tell us how often you'd like us to come and we'll confirm the price per visit in writing.
Other lantern repairs in Cardiff
- Ridge and hip repairs in Cardiff
- Misted glass unit replacement in Cardiff
- Condensation diagnosis and fixes in Cardiff
- Aluminium roof lantern repairs in Cardiff
- Flat rooflight and skylight repairs in Cardiff
- Urgent leak make-safe in Cardiff
Cleaning and maintenance near Cardiff
More about cleaning and maintenance · All roof lantern repairs in Cardiff