RM postcode locations
RM Postcode Area: Damp, Mould & Leak Detection by District
20 districts from RM1 to RM20. Pick your district to find the local page for your street.
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Fully insured · Non-invasive methods first · Written reports included · London & Surrey
The RM postcode area
The RM postcode area is named after Romford and covers the London Borough of Havering (Romford, Gidea Park, Hornchurch, Upminster, Rainham, Harold Wood and Collier Row) with Dagenham and Chadwell Heath in Barking and Dagenham, RM4 reaching into Epping Forest and Brentwood districts in Essex, and RM15 to RM20 covering Thurrock: South Ockendon, Grays, Tilbury and Purfleet.
Havering is mainly inter-war and post-war suburbia with the large Harold Hill estate and the garden suburb of Gidea Park; Dagenham is dominated by the Becontree estate, one of the largest council-built estates in the country when it was laid out. Houses of these ages share the same failure points: original cast-iron and lead pipework replaced piecemeal, cavity walls, concrete ground floors and added extensions.
Each district below links to the places inside it; the Thurrock districts have no local page yet. The borough page named on the row covers the rest.
How the RM districts fall by council. In our directory Havering has places in RM1 to RM3, RM5, RM7 and RM11 to RM14; Barking and Dagenham in RM6 and RM8 to RM10; Redbridge in RM6, all of them in Greater London. Royal Mail post towns across the area: Romford, Dagenham, Hornchurch, Rainham, Upminster, South Ockendon, Grays, Tilbury, Purfleet.
Housing in Havering and Barking and Dagenham (Census 2021), the main council areas for RM postcodes in our directory: 175,178 households: 58% owner-occupiers, 19% private renters, 21% social renters. Housing stock: purpose-built flats 23%, converted and other flats 3%, terraced 32%, semi-detached 33%, detached 9%.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.
Districts RM1 to RM20
RM1: Romford
Council area: Havering.
Also covered: Romford.
RM2: Romford
Council area: Havering.
Also covered: Gallows Corner, Gidea Park.
RM3: Romford
Council area: Havering.
Also covered: Gallows Corner, Noak Hill, Harold Hill, Harold Park, Harold Wood.
RM4: Romford
Council area: Havering / Epping Forest / Brentwood.
Also covered: Noak Hill, Havering-atte-Bower.
RM5: Romford
Council area: Havering / Barking and Dagenham / Redbridge.
Also covered: Chase Cross, Collier Row.
RM6: Romford
Council area: Barking and Dagenham / Redbridge / Havering.
Also covered: Chadwell Heath, Marks Gate.
RM7: Romford
Council area: Barking and Dagenham / Havering.
Also covered: Rush Green.
RM8: Dagenham
Council area: Barking and Dagenham / Redbridge.
Also covered: Becontree Heath.
RM9: Dagenham
Council area: Barking and Dagenham / Redbridge / Havering.
Also covered: Beam Park, Dagenham, Becontree, Castle Green.
RM10: Dagenham
Council area: Barking and Dagenham.
Also covered: Dagenham.
RM11: Hornchurch
Council area: Havering.
Also covered: Hornchurch, Ardleigh Green, Emerson Park.
RM12: Hornchurch
Council area: Havering.
Also covered: Hornchurch, Elm Park, Upminster Bridge.
RM13: Rainham
Council area: Havering.
Also covered: Beam Park, Rainham, South Hornchurch, Wennington.
RM14: Upminster
Council area: Havering / Thurrock.
Also covered: Cranham, Upminster, North Ockendon.
RM15: South Ockendon
Council area: Thurrock / Havering.
Mainly Thurrock, outside our standard area. Call 0800 054 1524 to check cover.
RM16: Grays
Council area: Thurrock.
Mainly Thurrock, outside our standard area. Call 0800 054 1524 to check cover.
RM17: Grays
Council area: Thurrock.
Mainly Thurrock, outside our standard area. Call 0800 054 1524 to check cover.
RM18: Tilbury
Council area: Thurrock.
Mainly Thurrock, outside our standard area. Call 0800 054 1524 to check cover.
RM19: Purfleet
Council area: Thurrock.
Mainly Thurrock, outside our standard area. Call 0800 054 1524 to check cover.
RM20: Grays
Council area: Thurrock.
Mainly Thurrock, outside our standard area. Call 0800 054 1524 to check cover.
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 RM postcode area
One team for the investigation, the report and the remedial work that follows. All services →
Leak detection
Thermal imaging, acoustic listening and moisture tracing to pinpoint a hidden leak before any wall comes down.
Insurance-ready reports
A report that answers the adjuster’s questions before they are asked: cause, route, extent, evidence.
Damp & mould surveys
Independent damp diagnosis for owners, buyers and landlords, with no treatment sold on the back of it.
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 the RM postcode area
Whether it is a stain, a smell or water on the floor, start with a call or a WhatsApp message and our team will take it from there.
Get a call back☎ 0800 054 1524WhatsApp us
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Evidence Reports
Terms
Request a call back about a property in the RM postcode area
Tell us where the property is and what you have seen. One of our engineers will call to arrange the visit; active leaks should be phoned through on 0800 054 1524.
What people in the RM postcode area ask us
How is a visit to the RM postcode area priced?
Every visit is quoted individually once we understand the problem, and the price is confirmed before anyone travels. There is no separate area charge anywhere in the RM postcode area.
Can a tenant or managing agent book you for a property in the RM 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.
I rent in the RM postcode area. Can I ask you to investigate?
Yes, with the owner’s agreement. Tenants, landlords and managing agents all instruct us; the report goes to whoever books the visit and can be shared with the others involved.
Last reviewed: 27 October 2026. Independent investigation and written reports. Repairs are quoted separately.