RH postcode locations
RH Postcode Area: Damp, Mould & Leak Detection by District
20 districts from RH1 to RH20. Find your district in the list and follow the link to the local page nearest your address.
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Fully insured · Non-invasive methods first · Written reports included · London & Surrey
The RH postcode area
The RH postcode area is named after Redhill and covers east Surrey (Redhill, Reigate, Dorking, Horley, Oxted, Lingfield and the Tandridge and Mole Valley villages) and north east West Sussex, including Crawley, Horsham, Haywards Heath, Burgess Hill and East Grinstead, with Gatwick Airport in RH6. Mail for the area is sorted at Gatwick. Our team covers the Surrey districts and most of the Sussex ones.
North of the Downs the housing is largely Victorian and inter-war around Reigate, Redhill and Dorking; south of them the Weald clay carries older cottages, post-war estates in Crawley and Horsham, and newer developments around Horley, Burgess Hill and Haywards Heath. Clay ground, timber-framed older buildings and the mix of ages in the Weald towns make damp investigations here varied.
Each district below links to the places inside it, with the council page named on the row.
Where the RH districts sit. Across the area Mid Sussex has places in RH10 to RH11, RH15 to RH17 and RH19; Horsham in RH11 to RH14 and RH20; Mole Valley in RH3 to RH6; Tandridge in RH1 and RH7 to RH9; Crawley in RH6 and RH10 to RH11; Reigate and Banstead in RH1 to RH2 and RH6, so the area straddles Sussex and Surrey. Royal Mail post towns across the area: Redhill, Reigate, Betchworth, Dorking, Gatwick, Horley, Lingfield, Oxted, Godstone, Crawley, Horsham, Billingshurst, Burgess Hill, Haywards Heath, Forest Row, East Grinstead, Pulborough. Wealden (RH18 to RH19) is in the part of Sussex we attend by arrangement only.
Housing in Mid Sussex, Horsham and Mole Valley (Census 2021), the main council areas for RH postcodes in our directory: owner-occupiers make up 73% of 162,858 households, private renters 15% and social renters 11%. Purpose-built flats account for 16% of homes, converted and other flats 4%, terraced houses 15%, semi-detached houses 28% and detached houses 36%.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.
Districts RH1 to RH20
RH1: Redhill
Council area: Reigate and Banstead / Tandridge.
Redhill · Merstham · Whitebushes · Bletchingley · Salfords · South Nutfield · Nutfield · Outwood
RH2: Reigate
Council area: Mole Valley / Reigate and Banstead.
Also covered: Woodhatch.
RH3: Betchworth
Council area: Mole Valley.
RH4: Dorking
Council area: Mole Valley.
RH5: Dorking
Council area: Mole Valley / Guildford.
North Holmwood · Mickleham · Westhumble · Holmbury St Mary · Newdigate · Ockley · Abinger · Abinger Hammer · Capel · Oakwoodhill · Wotton
Also covered: Abinger Common, Beare Green, Coldharbour, Cudworth, Forest Green, Walliswood and 1 more.
RH6: Gatwick and Horley
Council area: Tandridge / Reigate and Banstead / Mole Valley / Crawley.
Horley · Burstow · Charlwood · Smallfield · Horne
Also covered: Meath Green.
RH7: Lingfield
Council area: Tandridge.
Crowhurst · Dormansland · Lingfield
Also covered: Blindley Heath, Newchapel.
RH8: Oxted
Council area: Tandridge.
Oxted · Titsey · Limpsfield
Also covered: Hurst Green.
RH9: Godstone
Council area: Tandridge.
RH10: Crawley
Council area: Crawley / Mid Sussex.
Also covered: Furnace Green, Maidenbower, Three Bridges, Worth, Copthorne, Crawley Down and 1 more.
RH11: Crawley
Council area: Crawley / Mid Sussex / Horsham.
Also covered: Ifield, Pease Pottage.
RH12: Horsham
Council area: Horsham / Waverley.
Also covered: Rudgwick, Broadbridge Heath, Faygate, Kingsfold, Rusper, Tisman’s Common and 4 more.
RH13: Horsham
Council area: Horsham.
Also covered: Barns Green, Brooks Green, Colgate, Coolham, Cowfold, Crabtree and 17 more.
RH14: Billingshurst
Council area: Chichester / Horsham.
Also covered: Adversane, Billingshurst, Five Oaks, Coneyhurst.
The Sussex villages here (Ifold, Kirdford, Loxwood, Plaistow, Wisborough Green) are by arrangement.
RH15: Burgess Hill
Council area: Mid Sussex / Lewes.
Also covered: Burgess Hill, Abbotsford.
RH16: Haywards Heath
Council area: Mid Sussex.
Also covered: Haywards Heath, Lindfield, Walstead.
RH17: Haywards Heath
Council area: Mid Sussex / Lewes / Wealden.
Also covered: Cuckfield, Whitemans Green, Ansty, Ardingly, Balcombe, Bolney and 9 more.
RH18: Forest Row
Council area: Wealden.
Rest of Sussex, by arrangement. Call 0800 054 1524 and we will confirm whether we can attend.
RH19: East Grinstead
Council area: Mid Sussex / Tandridge / Wealden.
Also covered: East Grinstead, Ashurst Wood, Sharpthorne, West Hoathly, Selsfield Common.
The Sussex village here (Hammerwood) is by arrangement.
RH20: Pulborough
Council area: Horsham / Chichester.
Also covered: Ashington, Codmore Hill, Coldwaltham, Cootham, Marehill, North Heath and 12 more.
The Sussex villages here (Bedham, Bignor, Bury, Fittleworth, Stopham, Sutton and 1 more) are by arrangement.
RH77 is a non-geographic code used for business and PO-box mail, with no street addresses, so there is no local page.
Part of our Surrey and Sussex 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 RH postcode area
Instruments, evidence and a report you can act on, then the repair if you want it. All services →
Trace & access (insurance)
We find and expose the leak and document it for your escape-of-water claim.
Insurance-ready reports
Findings, cause, photographs and moisture readings in a report you can forward as soon as you receive it.
Mould treatment & investigation
We find the moisture source, treat the mould and tackle the cause so it is far less likely to return, all backed by a written report.
Moisture mapping & thermal imaging
The non-invasive toolkit that finds the problem without exploratory holes.
Book a damp, mould or leak investigation in the RH postcode area
Describe the problem, we confirm the scope and the price, and an engineer is booked. Urgent, active leaks are moved to the front.
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Evidence Reports
Terms
Ask our team about a property in the RH postcode area
What have you noticed, and since when? Add a phone number and our team will call to discuss it. Emergencies: 0800 054 1524.
Answers for customers in the RH postcode area
Can you find a leak under a floor or behind tiles in the RH postcode area without breaking things?
That is what the instruments are for: thermal imaging, acoustic listening and moisture mapping narrow the search before anything is opened. We open up only where the evidence points, and we make good afterwards.
How do I find the right page for my street in the RH postcode area?
Use the listings on this page or the postcode directory; both lead to the same local page for each place. If your area is not listed, call 0800 054 1524. It is almost certainly still covered.
Which areas does the RH postcode area page cover?
Every place listed above links to its own page with local detail; places in the RH postcode area without a page yet are still covered. Call 0800 054 1524 and we will confirm availability.
Last reviewed: 27 October 2026. Independent investigation and written reports. Repairs are quoted separately.