Yorkshire building-fabric specialists
Find the cause. Fix it properly. Protect your home.
Northern Seal & Joint helps Yorkshire homeowners stop leaks, damp, draughts and masonry decay at the source. We diagnose the failure first, then use the right repair for the building — not a cosmetic patch that leaves the problem behind.
What we fix
Building envelope failures rarely fix themselves. Diagnosing the cause correctly is what stops the problem returning.
Not sure? Start here
Pick the closest match and we’ll take you straight to the likely cause and the correct fix.
How we fix it
We do not carry out general building work, roofing or rendering. We do these things, properly.
Sound modern brick & stone properties.
See method ServiceOlder and heritage buildings - pre-1920.
See method ServiceWindows, doors, expansion joints.
See method ServiceKitchens, bathrooms, wet rooms.
See method ServicePerished EPDM and Q-Lon seals.
See method ServiceBrick & stone replacement, structural pointing.
See method ServiceFailing patio joints, slab relaying.
See method ServiceVapour-permeable façade protection.
See methodThe NSJ Repair Standard
A crack in a mortar joint or a gap in a sealant bead might look minor. Left alone, it becomes a water pathway into the wall. Over months, that moisture saturates the masonry, tracks into the structure, and starts to affect internal surfaces — damp patches, mould, deteriorating plasterwork.
The cause is almost always fixable cheaply at the early stage. It becomes significantly more expensive once the damage is established. NSJ works to a consistent standard: find the cause, specify the right repair, remove what has failed, and protect the repair properly.
Book a leak & damp inspectionProof of workmanship
Drag the handle to compare. Every job completed to specification, no shortcuts.
What our clients say
Rated 5.0 across recent jobs. See the full set of Google Reviews on the Reviews page.
Inspection
Water and damp problems are often misdiagnosed - or patched without understanding the source. Our Building Leak and Damp Inspection service identifies exactly what is allowing water in, which wall or junction is affected, and what the correct repair route is. You get a clear answer before any repair cost is committed.
Find out about inspections →