Leak to dry to treated, one company in Harrow
Harrow's housing stock is dominated by 1930s Metroland semis and terraces in Pinner, Hatch End and Harrow Weald, alongside interwar bay-fronted houses and flats above shops in Wealdstone and Harrow town centre. Solid and early cavity walls, single-glazed originals and loft conversions restrict airflow, so condensation and black mould readily form on cold external walls, in bedrooms and behind furniture.
Mould Treatment
Treat and prevent the mould that follows water damage, dealing with the moisture source first. Mould treatment →
Damp Investigation
Tell rising damp, penetrating damp and condensation apart, so the right repair is done once. Damp investigation →
Leak Detection
Trace hidden water leaks without unnecessary damage using thermal, acoustic and tracer-gas methods. Leak detection →
Structural Drying
Dry walls, floors and voids after a leak or flood with monitored dehumidifiers, to completion. Structural drying →
Areas of Harrow we cover
We treat mould right across Harrow and its neighbourhoods, including:
- Harrow on the Hill
- Wealdstone
- Pinner
- North Harrow
- South Harrow
- Rayners Lane
- Kenton
- Hatch End
- Stanmore
- Harrow Weald
- Roxeth
- Belmont
- West Harrow
- Headstone
Common causes of mould in Harrow homes
Cold bridging in bay-fronted 1930s semis
Many of Harrow's 1930s semis in Pinner, North Harrow and Harrow Weald have bay windows, chimney breasts and thin early cavity or solid walls that lose heat quickly. These cold spots let warm, moist air condense on internal plaster, producing black speckling in bedroom corners, behind wardrobes pushed against external walls, and around window reveals where mastic and frames have failed.
Loft conversions and rear extensions trapping moisture
Harrow has many owner-extended homes, particularly loft conversions in Hatch End, Stanmore and South Harrow, where sloped ceilings, Velux roof lights and boxed-in eaves cut off natural ventilation paths. Bathrooms squeezed into these spaces often rely on undersized extractor fans, so steam settles on cold roof timbers and plasterboard, feeding mould along ceiling edges, roof light frames and the base of dormer walls.
Ageing flat roofs and parapets above Wealdstone's shops and flats
Wealdstone and central Harrow have numerous flats above shops and older buildings split into multiple units, many with flat roofs, parapet walls and shared guttering that have gone years without proper upkeep. Once these fail, penetrating damp tracks down through party walls and ceilings, leaving mould around window frames, in bathrooms with no external extraction, and along skirting where damp plaster stays permanently cold and wet.
What our customers say
Amazing company! They responding very quickly. They have a low prices as well, not crazy quotes like from others. Job has been done very quickly and team was very professional. I will use them in the future if I needed. Thanks!
Patryk Gutowski, via Google
Really impressed with the whole experience. The surveyor did a proper, thorough job and didn't rush anything, they got to the root cause of the damp and explained it all clearly. Detailed, professional and reassuring from start to finish. Couldn't recommend them more highly.
Keiryn Raf, via Google
Very professional and organised I must say came out and completed the work very efficiently customer service was excellent. Definitely recommend this damp and mould service to anyone looking for a job done correctly. :)
Joeie Rouse, via Google
Mould problem in Harrow?
Call 020 3051 8478 or book a mould survey online. We remove mould and fix the cause for homeowners, landlords and managing agents across Harrow.