SW postcode locations
SW Postcode Area: Damp, Mould & Leak Detection by District
20 districts from SW1 to SW20, with lettered sub-districts listed under their number. Each district below links to the local pages and the council page that cover it.
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Fully insured · Non-invasive methods first · Written reports included · London & Surrey
The SW postcode area
The SW postcode area is the South Western district of the London post town, numbered in 1917 and later extended. SW1 covers Westminster, Belgravia, Pimlico, Victoria and Whitehall and is split into lettered sub-districts; SW2 to SW10 run from Brixton through Clapham, Battersea and Fulham to Chelsea and South Kensington; SW11 to SW20 cover Battersea, Wandsworth, Putney, Streatham, Tooting, Balham, Barnes, Wimbledon and Raynes Park. The area sits on both sides of the Thames and is sorted at the Jubilee Mail Centre. Most of the places listed below are in Wandsworth, Lambeth, Kensington and Chelsea and Westminster.
Stucco terraces and mansion blocks in Belgravia, Pimlico and Chelsea; Victorian terraces across Clapham, Battersea, Fulham, Balham and Tooting, most divided into flats; large estates in Stockwell, Brixton and Battersea; Edwardian and inter-war streets in Wimbledon, Southfields and Raynes Park. Flats in converted houses and mansion blocks with ageing shared stacks are the recurring sources of the leaks we trace in SW.
Each district below links to the places inside it, with the borough page named on the row. Lettered sub-districts sit under their number.
Where the SW districts sit. Across the area Wandsworth has places in SW8, SW11 to SW12 and SW15 to SW19; Lambeth in SW2, SW4, SW8 to SW9, SW12 and SW16; Kensington and Chelsea in SW3, SW5, SW7 and SW10; Merton in SW16 and SW19 to SW20; Kingston upon Thames in SW15 and SW20; Richmond upon Thames in SW13 to SW14; Croydon in SW16; Hammersmith and Fulham in SW6; Westminster in SW1, all of them in Greater London. The post town for every district is London.
Housing in Wandsworth, Lambeth and Kensington and Chelsea (Census 2021), the main council areas for SW postcodes in our directory: owner-occupiers make up 37% of 338,964 households, private renters 35% and social renters 27%. Purpose-built flats account for 51% of homes, converted and other flats 23%, terraced houses 17%, semi-detached houses 7% and detached houses 2%.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.
Districts SW1 to SW20
SW1: London
Sub-districts: SW1A, SW1E, SW1H, SW1P, SW1V, SW1W, SW1X, SW1Y.
Council area: Westminster / Kensington and Chelsea.
Also covered: Belgravia, Pimlico, St James’s, Knightsbridge, Millbank.
SW2: London
Council area: Lambeth.
Also covered: Tulse Hill.
SW3: London
Council area: Kensington and Chelsea.
Also covered: South Kensington, Brompton.
SW4: London
Council area: Lambeth / Wandsworth.
SW5: London
Council area: Kensington and Chelsea.
Also covered: South Kensington, Earls Court.
SW6: London
Council area: Hammersmith and Fulham.
Also covered: Parsons Green, Sands End.
SW7: London
Council area: Kensington and Chelsea / Westminster.
Also covered: South Kensington.
SW8: London
Council area: Lambeth / Wandsworth.
Also covered: Oval, Nine Elms.
SW9: London
Council area: Lambeth.
Also covered: Oval.
SW10: London
Council area: Kensington and Chelsea / Hammersmith and Fulham.
Also covered: West Brompton, Earls Court.
SW11: London
Council area: Wandsworth.
SW12: London
Council area: Wandsworth / Lambeth.
SW13: London
Council area: Richmond upon Thames.
Also covered: Barnes, Castelnau.
SW14: London
Council area: Richmond upon Thames.
Also covered: East Sheen, Mortlake.
SW15: London
Council area: Wandsworth / Kingston upon Thames / Richmond upon Thames.
Also covered: Kingston Vale, Roehampton.
SW16: London
Council area: Croydon / Lambeth / Wandsworth / Merton.
SW17: London
Council area: Wandsworth / Merton.
Also covered: Tooting Bec.
SW18: London
Council area: Wandsworth.
SW19: London
Council area: Merton / Wandsworth.
Southfields · Wimbledon · Colliers Wood
Also covered: Merton Park, South Wimbledon.
SW20: London
Council area: Merton / Kingston upon Thames.
Part of our London coverage. All postcode areas · All locations
Real investigations by our team
Examples from DML investigations across our service area. Our own photographs, not stock imagery.
What we do across the SW postcode area
Leaks, damp and mould share one discipline: locate the moisture, explain it, remove it. All services →
Trace & access (insurance)
The trace, the minimal opening-up and the written evidence your buildings insurer expects.
Mould treatment & investigation
Mould is a symptom. We identify what is feeding it, treat the growth and specify the fix for the cause.
Damp & mould surveys
Room-by-room moisture mapping that separates condensation from penetrating and rising damp.
Moisture mapping & thermal imaging
The non-invasive toolkit that finds the problem without exploratory holes.
Book a damp, mould or leak investigation in the SW postcode area
Phone or message with what you have noticed; our team will confirm the scope and arrange the visit. Active leaks are prioritised.
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Included
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Evidence Reports
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Arrange an investigation in the SW postcode area
Tell us what’s happening and one of our team will call you back. For urgent problems call 0800 054 1524.
Questions we are asked in the SW postcode area
Do you do the repairs in the SW postcode area too?
Yes. The investigation and report come first; remedial works are quoted separately and our team carries them out or manages them.
Can a tenant or managing agent book you for a property in the SW postcode area?
Yes. We take instructions from owners, landlords, managing agents and, with the owner’s agreement, tenants. The report goes to whoever instructed us and can be shared with the others.
Do you report to freeholders and managing agents for blocks in the SW postcode area?
Regularly. For flats and blocks we identify whether the source is a private pipe, a communal service or the fabric of the building, and write it up so the freeholder, agent and insurers can allocate responsibility.
Last reviewed: 27 October 2026. Independent investigation and written reports. Repairs are quoted separately.