Surrey · London and the South East
Electronic Leak Detection in Merstham
Know where you stand with the flat roof membrane before you spend money on it. Electronic leak detection in Merstham, with photos and a clear written report.
- Water coming in under a flat roof
- Breaches hidden under paving or planting
- Breaches around outlets and penetrations
Merstham questions
Is Merstham in the area you cover?
Yes, Merstham is within the area we cover. We survey roofs across London and the South East. You can call 07833 053749 or send us an email with the address and some details.
How do I find out if my home in Merstham is listed?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. Listed building consent is needed for changes that affect a listed building’s special interest, and conservation areas can limit changes of roofing material.
What will the report tell me?
It sets out what we found, why it matters and what we recommend, backed by photos. Anything we couldn’t see safely is noted too, so you know exactly what was covered.
Does someone need to be in?
Not always. If we only need the outside, we can agree that in advance, but the loft and any rooms with damp need someone to let us in.
Can you give me structural calculations?
No. We point out what can be seen, such as sagging or deflection, but we are not structural engineers and don’t carry out calculations. If we think you need an engineer, the report says so.
Can you tell me if my roof has asbestos?
No. Asbestos surveys and testing are not part of what we do. We flag materials that could contain asbestos, like cement sheets or soffits on pre-2000 buildings, and recommend a specialist asbestos surveyor checks them before they’re disturbed.
What is electronic leak detection?
A sound membrane blocks the test current, but a hole lets it through. That’s how we locate breaches you cannot see.
Electronic leak detection in Merstham: what you get
Our ELD report shows where each breach was found, with photos. It tells your roofer exactly where to repair instead of hunting for the leak. We do not estimate repair costs, so your roofer prices the work. Testing again after repairs can confirm the breaches have been dealt with, where the roof still suits the method. Results come in a written report with photos. Common reasons to book are new roofs to check before paving or planting and failed seams and laps, across roof terraces and balconies, green roofs and commercial flat roofs.
Somewhere as small as Merstham, flat roofs tend to be on extensions, garages and converted outbuildings. They need the same care as any town roof: the covering, the edges, the upstands and where water drains away. We simply plan the journey and access ahead of time. If there are outbuildings or garages with flat roofs, mention them when booking.
You can share the report with anyone who needs it: a seller or estate agent, an insurer, a roofer, a builder or a managing agent.
- Location
- Merstham (RH1)
- Region
- Surrey
- Prices
- Quoted for your roof
- Your report
- Written, with photos, emailed to you
- Survey days
- Weekdays, Saturdays and Sundays
- Insured
- Professional indemnity and public liability
- Phone
- 07833 053749
- Updated
- 27 October 2026
Before and after the survey
A few practical points come up again and again on our surveys. They apply to most roofs:
- Record dates and spots where water appears
- Check trades protect the waterproofing
- Stay off the flat roof unless needed
- Keep outlets clear of debris
Wet insulation may need attention after a leak. Your roofer can advise on that, and moisture readings can help.
Limit foot traffic on flat roofs. Feet and dropped tools are a common cause of holes.
How the survey changes by roof type
Single-ply membranes
Many offices and units have single-ply roofs. Seams and penetrations are typical breach points.
Liquid-applied waterproofing
Liquid waterproofing has no laps but holes and thin areas can occur. Suitability for ELD depends on the system.
Nearby places to Merstham
More services for Merstham
What happens if roof problems are left?
Water trapped under a membrane can soak insulation and decking. Locating it early helps limit the damage. Matching old materials, like handmade tiles or stone slates, can take time to source. That is one more reason to find defects before they become urgent.
Every price we give includes VAT. We quote electronic leak detection for each roof, as the method and time depend on the roof. We confirm the exact price before booking.
What you get with us
- Satisfaction rate of 98%
- Plain-English reports with photos
- Over 20 years’ experience
- Independent findings on the roof’s condition
See what a roof survey costs and two real surveys.
Electronic leak detection around Merstham
Before planning roof work on an older home, find out whether it is listed or in a conservation area. Changes that affect a listed building’s special interest need listed building consent, and councils can also use Article 4 directions to control changes in conservation areas. In Surrey, older roofs are often handmade clay tile, with tile-hanging on many upper walls. A few of Surrey’s oldest buildings have heavy Horsham stone slab roofs. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere.
Take a building like Merstham Primary School: schools and public buildings often have big flat roofs, and their outlets and upstands need regular checks. Take an older house close to Church of St Katharine: the flat roofs on later extensions tend to wear out long before the main roof. If you own a rental within reach of Merstham station, flat roofs over rear additions and dormers in rented property are worth checking between tenancies.
Merstham is about 2 miles north of Redhill, in Surrey. Whether the building in Merstham is a house, a flat or a commercial unit, the roof can be surveyed on a weekday or at the weekend. Across Surrey, we cover Merstham. There’s also a page for Crawley.
Here we cover the RH1 postcode area for electronic leak detection. We offer electronic leak detection to properties on London Road North, Shepherd's Hill and Church Hill. Other places close to Merstham include South Merstham (1 mile south), Gatton (1 mile south-west), Holmethorpe (1 mile south), Hooley (2 miles north) and Netherne on-the-Hill (2 miles north). We also work in nearby towns such as Epsom (7 miles north-west), Horley (6 miles south), Ewell (7 miles north-west), Reigate (3 miles south-west), Walton-on-Thames (14 miles north-west) and Caterham (3 miles north-east).
Local landmarks in Merstham
Locally, jobs take us to homes and businesses close to Merstham Park School, Nutfield Marshes and East Surrey College. For rail, the closest station is Merstham station, about 0.5 miles south. Other landmarks nearby include Surrey Fire Museum (2.8 miles south-west) and Bletchingley Castle (2.8 miles south-east). Open spaces near Merstham include South London Downs National Nature Reserve and Colley Hill.
Landlord and commercial surveys in Merstham
Letting agents frequently book on a landlord’s behalf, with the report sent to whoever needs it. Access is agreed with the tenant beforehand.
With a portfolio of properties, surveys can be booked for more than one address. To discuss a number of properties, call 07833 053749 or email us with the addresses.
What you can safely check yourself
What you cannot do safely is get up close. Slates, tiles, flat roofs and rooflights can give way. That is where a survey comes in, using safe viewpoints and a drone where it applies.
After heavy rain, check ceilings and the tops of walls for new stains. Photograph them and note the date, as it helps a surveyor trace the cause.
What we do, step by step
The aim of the visit is simple: to see as much of the flat roof membrane as can be seen safely and record it clearly. Everything we note and photograph goes into the written report. The visit normally takes more time on a big roof than a small one, and the build-up of the roof makes a difference too. Rural addresses near Merstham can be hard to find from a postcode alone, so a few directions, or a note of a nearby landmark, help us arrive on time. After that, the survey runs as it would anywhere.
- We start by finding out what the roof is made of and where it leaks.
- We check that the membrane and build-up suit electronic leak detection.
- The method depends on the membrane and what sits above and below it.
- We test the membrane and find where current is passing through it.
- You get a report showing where each breach is, for your roofer to repair.
Before we arrive
- Move anything stored under the loft hatch
- Show us where any leaks or stains appear
- Leave side gates unlocked
How to book
Most bookings start with a short call: ring 07833 053749 or drop us an email and we’ll ask a few questions about the roof. The price is agreed before a date is set.