South London locations
Damp, Mould & Leak Detection in South London
Croydon, Lambeth, Merton and Sutton: four boroughs south of the river, from Vauxhall and Brixton down to Purley and Cheam.
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Fully insured · Non-invasive methods first · Written reports included · London & Surrey
Damp, mould and leaks across south London
South London grew out of Southwark (first recorded as Suthriganaweorc, the fort of the men of Surrey) and spread into what was northern Surrey and western Kent. On this site the south west boroughs of Kingston, Richmond and Wandsworth have their own hub, and the south east boroughs theirs; this page covers the four in the middle: Lambeth, Merton, Croydon and Sutton, from Vauxhall, Stockwell, Brixton, Clapham and Streatham through Wimbledon, Mitcham and Morden to Thornton Heath, Addiscombe, Purley, Carshalton and Cheam.
Across the four boroughs the 2021 Census counted roughly 452,000 households, and exactly half of them own their home. Terraced houses are the single largest house type at 23 %, semis 19 % and purpose-built flats 36 %; converted flats are 14 % overall but far more common in Lambeth than in Sutton.
This is the part of London with the most neighbourhood pages on this site, because it is where the stock changes fastest: Victorian terraces and converted flats in Lambeth, Edwardian and inter-war suburbs in Merton and Sutton, and a mix of all three plus post-war estates in Croydon. Leaks between flats, penetrating damp through solid walls, defective bay and flat roofs, and mould in rented homes make up most of the work. Every borough below links to its own page and to its neighbourhood pages.
The four boroughs
London Borough of Croydon
Main postcode districts: CR0, CR2, CR4, CR5, CR7, CR8, SE19, SE25, SW16.
Housing in Croydon (Census 2021): owner-occupiers make up 55% of 152,945 households, private renters 26% and social renters 18%. Purpose-built flats account for 29% of homes, converted and other flats 11%, terraced houses 23%, semi-detached houses 25% and detached houses 12%.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.
Addiscombe · Norbury · Purley · Thornton Heath · South Croydon · Kenley · Sanderstead
Also covered: Coombe, Addington, Forestdale, New Addington, Selhurst, Shirley, South Norwood, Waddon, Woodside, Coulsdon and 5 more.
London Borough of Lambeth
Main postcode districts: SE1, SE11, SE19, SE24, SE27, SE5, SW12, SW16, SW2, SW4, SW8, SW9.
Housing in Lambeth (Census 2021): 134,688 households: 33% owner-occupiers, 32% private renters, 34% social renters. Housing stock: purpose-built flats 52%, converted and other flats 24%, terraced 15%, semi-detached 8%, detached 2%.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.
Clapham · Brixton · Streatham · Stockwell · Brixton Hill · Herne Hill · Vauxhall
Also covered: Tulse Hill, West Norwood, Gipsy Hill, Oval, Kennington, West Dulwich.
London Borough of Merton
Main postcode districts: SW19, SW20, CR4, SM4, SW16, KT3.
Housing in Merton (Census 2021): tenure across 81,726 households is 56% owner-occupied, 29% private rented and 14% social rented; by type, 28% purpose-built flats, 11% converted or other flats, 36% terraced, 19% semi-detached, 6% detached.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.
Wimbledon · Mitcham · Raynes Park · Morden · Colliers Wood
Also covered: Lower Morden, Merton Park, Morden Park, South Wimbledon, St Helier.
London Borough of Sutton
Main postcode districts: CR4, KT4, SM1, SM2, SM3, SM5, SM6.
Housing in Sutton (Census 2021): 82,347 households, of which 64% are owner-occupied, 20% privately rented and 14% socially rented. The housing stock is 31% purpose-built flats, 6% flats in converted or shared buildings, 24% terraced, 28% semi-detached and 10% detached houses.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.
Cheam · Worcester Park · Carshalton · Wallington
Also covered: Beddington.
All London boroughs · All locations · CR postcode area · KT postcode area · SE postcode area · SM postcode area · SW postcode area
Real investigations by our team
Examples from DML investigations across our service area. Our own photographs, not stock imagery.
What we do across South London
Find the cause, prove it in writing, then put it right: the same order on every job. All services →
Leak detection
When the water is coming from somewhere nobody can see, our instruments find it and our report explains it.
Trace & access (insurance)
Targeted access at the leak point only, with the photographs and readings a loss adjuster asks for.
Moisture mapping & thermal imaging
Calibrated readings and thermal surveys that show exactly where the moisture is, and where it isn’t.
CCTV drainage surveys
When a wall is wet at the base and nothing inside explains it, the drain outside usually does; we put a camera in it.
Book a damp, mould or leak investigation in South London
Call us, WhatsApp us, or request a call back and one of our team will get straight back to you. Urgent leaks are prioritised.
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Tell us about your South London property
Our team reads every form and calls back to confirm the scope. If the problem is urgent, speak to us now on 0800 054 1524.
Common questions about South London
Which areas does the South London page cover?
Every place listed above links to its own page with local detail; places in South London without a page yet are still covered. Call 0800 054 1524 and we will confirm availability.
Do you treat mould as well as find the cause in South London?
Yes. Investigation and cause first, then treatment of the affected surfaces and the repair of the source, quoted separately and carried out or managed by our team.
Do you handle leaks between flats in South London?
Regularly. We establish whether the water comes from the flat above, a communal pipe or the property itself, record the route and write it up so the freeholder, managing agent and insurers can act on it.
Last reviewed: 27 October 2026. Independent investigation and written reports. Repairs are quoted separately.