Surrey · London and the South East
Electronic leak detection in Merrow, Surrey
Electronic leak detection in Merrow and the rest of Surrey. Surveys run on weekdays and at weekends.
- Leaks through a covered membrane
- A flat roof leak that cannot be traced
- Damage from equipment installers
About our electronic leak detection in Merrow
ELD is a way of pinpointing breaches in a flat roof’s waterproofing membrane. It uses a small electrical current that passes through the membrane only where there is a breach. It can find holes too small to spot by eye so your roofer knows exactly where to repair. The results come in a report with photos. We survey roof terraces and balconies, green roofs and flat roof membranes, and the problems we’re asked to look at most are damp inside with no sign on the roof and holes around roof penetrations.
In smaller places like Merrow, flat roofs are mostly on extensions, garages, porches and dormers. Even a small flat roof can let lots of water into the room below. Knowing the covering and how it was laid tells you what to expect from it, from felt and asphalt to EPDM rubber and GRP. Ponding, splits and lifting edges are the signs to look for from a window.
You can share the report with anyone who needs it: your solicitor, the seller, your insurer, a roofer or the building’s managing agent, whichever applies.
- Where
- Merrow (GU1, GU4)
- Wider area
- Surrey
- Prices
- Quoted for your roof
- Your report
- A written report with photos, by email
- Appointments
- Monday to Sunday, daytime
- Insurance
- PI and public liability insurance
- Telephone
- 07833 053749
- Updated
- 27 October 2026
Merrow: your questions answered
Do you cover Merrow?
Yes, Merrow is within the area we cover. We work right across London and the South East. You can ring 07833 053749 or send us an email with the address and some details, and we will talk through which survey suits.
Is my home in Merrow listed or in a conservation area?
You can check whether a building is listed on Historic England’s list, and your council can tell you if it’s in a conservation area. If a home is listed, changes that affect its special interest need listed building consent, and in a conservation area re-roofing in different materials may need permission.
Can you survey a shared roof?
Yes, as long as access is agreed. Roofs over flats are frequently shared, so the freeholder or managing agent needs to agree access. We inspect only the parts we are allowed to reach.
Will you walk on the roof?
Only if it’s safe. We check everything that can be seen safely: from the ground, from windows and vantage points, from the loft space, from the roof itself where safe and by drone where applicable. The report says if anything couldn’t be seen.
Are you structural engineers?
No. We’re roof surveyors, not structural engineers. We’ll recommend an engineer if we see signs that call for one.
How do you choose the testing method?
The roof decides the method. We will explain why when we quote.
How long have you been surveying roofs?
More than 5,000 surveys over 20+ years.
What electronic leak detection looks like in Merrow
Many older homes in Surrey have handmade clay tiles and tile-hung upper walls. Horsham stone slab roofs survive on some old buildings in Surrey. Next to the main roofs there is typically a flat roof somewhere, whether on an extension, a garage or a commercial unit. About 0.9 miles east lies Clandon Park, a reminder of how long the area around Merrow has been built on. Older homes in the wider area often have features worth a closer look, such as lead valleys, tall stacks and roofs that have been patched over the years, and a listed home or one in a conservation area may need consent for changes of material.
Anyone responsible for a site like Bushy Hill Junior School will know that a large flat roof with a good many outlets and rooflights has many places where a membrane can fail. If you own a rental within reach of Clandon station, a flat roof over a rented flat is easy to forget until the tenant reports a leak.
Merrow is about 2 miles east of Guildford, in Surrey. We carry out electronic leak detection for homes and businesses in Merrow and nearby. Across Surrey, we cover Merrow.
Electronic leak detection in GU1 and GU4 are booked the same way as anywhere else. That includes homes and businesses on Park Lane, Grove Road and Wykeham Road. Close by, we survey roofs in Burpham (1 mile north-west), Abbotswood (1 mile west), West Clandon (2 miles north-east), Guildford (2 miles west) and Chilworth (2 miles south). We also work in nearby towns such as Woking (5 miles north), Camberley (11 miles north-west), Epsom (13 miles north-east), Farnham (12 miles west), Ewell (14 miles north-east) and Egham (13 miles north).
Landmarks near Merrow
Locally, jobs take us to homes and businesses close to St Peter's Catholic School, St Peter's Catholic School and Riverside Park. Merrow’s nearest station is Clandon station, roughly 1.6 miles north-east of the centre. Well-known places in the area include Guildford Castle (2.1 miles south-west) and Surrey Infantry Museum (0.6 miles north-east). For a walk, there’s St Martha's Hill and Colyer's Hanger and Silent Pool.
Can I check my roof myself?
During heavy rain, look at the gutters from ground level or a window. Overflowing water can point to a blockage or a sagging run.
A lot can be seen from ground level. With binoculars, look for slipped or missing slates and tiles, gaps along the ridge and leaning chimneys. Please don’t climb up for a closer look.
Signs you need electronic leak detection in Merrow
If a flat roof keeps leaking after patching, the hole may be elsewhere. Electronic testing helps pinpoint it.
A survey makes sense if you’ve noticed:
- Breaches hidden under paving or planting
- Leaking laps in the waterproofing
- New roofs to check before paving or planting
- Punctures from foot traffic or tools
Take an older house close to Church of St John the Evangelist: any flat roof added at the back or on a dormer is likely to be far younger, and less durable, than the main roof.
Questions to ask before booking
- When you’ll get the report
- Whether any drone flown is registered with the CAA
- Whether you get a written report with photos
- Whether the loft space is looked at, where there is one
What we do, step by step
After the inspection, everything we found is written up in a report with photographs. On timing, it typically takes longer on a large roof than a small one, and the build-up of the roof makes a difference too. For a survey in Merrow, we agree the time, the access and parking before the day. Visits can be on weekdays, Saturdays or Sundays. If there are outbuildings or garages you want looked at, mention them.
- We agree the area to be tested.
- The surface is prepared for the chosen method.
- We work across the roof with the test equipment.
- Each breach found is located and recorded.
- The report is sent for your roofer to act on.
Before we arrive
- Point out any leaks or damp patches
- Let us know where we can park nearby
- If you are buying, let the agent know when we’re coming
Book a survey
If you’re buying, it helps to book soon after your offer is accepted, so there is time to use the report before exchange. Otherwise, simply ring 07833 053749 or drop us an email whenever suits you.
Advice
Surveys for landlords and agents in Merrow
Freeholders and residents’ companies use a roof report to plan and budget, putting the urgent items at the top.
Businesses and commercial landlords can book us too, including offices, shops and units. Larger roofs take longer, and they’re priced for the size.
Why act early in Merrow
Not every leak is in the membrane. Testing shows whether the membrane is breached so attention can go to the right place. Around Merrow, leaves and moss in gutters lead to overflowing water and damp walls. Dealing with the cause is simple; drying out a wall is not.
Bigger, taller and commercial roofs take more time to survey, so they’re priced to match. The price is confirmed before you book.
What you get with us
- An independent view of the roof
- 98% of clients satisfied
- A sub-250g drone, flown with a CAA Flyer ID and Operator ID
- A report with photos
Take a look at what a roof survey costs and what we found on two real jobs.
What a survey costs
Prices vary from roof to roof, and it comes down to:
- The shape of the roof and its details
- Roof area
- Any need for thermal images or a drone flight
- House, block, shop or office
For a price for your roof in Merrow, ring 07833 053749 or email us and tell us about the roof. The price is agreed before a date is set.
Helping us price your survey
Before you get in touch, it helps to have:
- The type of building and roof, such as pitched or flat
- Access details, such as a loft hatch or a shared roof
- Any marks or damp showing indoors
- What made you get in touch
Most bookings start with a short call: phone 07833 053749 or email us, and we will ask about the building and what you need. You’ll have a price before anything is arranged.