Damp Proofing West London

West London covers a wide range of homes, from Georgian and Victorian townhouses in Kensington and Chelsea to the Edwardian streets of Ealing and Chiswick and the 1930s semis of Greenford, Ruislip and Pinner. Each type of house has its own damp problems, and the right treatment depends on how and when it was built. That is why every West London job starts with a survey rather than a quote over the phone.

Close to the river, Fulham, Hammersmith, Chiswick, Kew and Putney sit on Thames gravels with a water table that rises and falls through the year. Cellars, basements and lower ground floors in these areas often take on water in winter, and older tanking that relies on the wall staying sound tends to fail. These spaces need waterproofing designed to BS 8102 rather than a standard damp treatment.

Further from the river, most of West London is built on London Clay. Clay shrinks in dry summers and swells in wet winters, and that movement opens fine cracks in old walls, render and floor slabs. It also holds water against anything below ground, which is why so many cellars in Ealing and Acton smell damp even when no water is visible.

The River Brent and the Grand Union Canal also shape ground conditions in parts of West London. Streets in Hanwell, Brentford and Greenford that sit low in the Brent valley can have a higher water table and wetter ground than neighbouring areas only a short walk away. In these streets we see more ground floor damp, more water in cellars and more timber decay under floors, so the survey always checks below floor level.

In the Victorian and Edwardian terraces of inner West London, rising damp is one of the most common problems we see. The original slate or bitumen damp proof course has often broken down, and it is frequently bridged by raised paths, patios and rendered plinths. The signs are tide marks, salt staining and crumbling plaster along the bottom of ground floor walls.

Penetrating damp is just as common in these solid walled houses. Bay roofs, parapet walls, valley gutters and worn pointing all let rain into brickwork that has no cavity to stop it. Painted and rendered fronts make it worse when they crack, because water gets in behind the coating and cannot dry out. We trace leaks with moisture readings and thermal imaging before recommending any repair.

The interwar suburbs of outer West London have different problems. Many 1930s semis in Greenford, Northolt, Ruislip and Pinner have cavity walls that were later filled with insulation. Where that insulation was poorly installed or the outer brickwork is exposed to driving rain, damp can bridge the cavity and show up as patches on inside walls. Blocked air bricks under suspended timber floors are also common, leading to wet rot in joists.

Across West London, condensation and black mould are the most common problems in flats, from mansion blocks in Kensington to converted houses in Shepherd's Bush and newer blocks near the river. Cold walls, small bathrooms without extraction and drying washing indoors all add moisture. Better ventilation usually solves it, and we measure the walls first to rule out rising or penetrating damp.

Much of West London is in conservation areas across the boroughs of Hammersmith and Fulham, Kensington and Chelsea, Ealing, Hounslow and Richmond. Internal damp treatments rarely need planning permission, but external changes to render, front walls or windows may need consent. Our surveys are carried out by CSSW and CSRT trained specialists, and you receive a clear written report with photos, the cause and the recommended fix.