Oxfordshire · London and the South East
Electronic leak detection in Merton, Oxfordshire
Electronic leak detection in Merton, backed by more than 20 years’ experience. You get a clear report with photos.
- Leaks showing away from the breach
- Patched roofs that still leak
- Water coming in under a flat roof
Electronic leak detection for homes and businesses in Merton
ELD is a way of pinpointing breaches in a flat roof’s waterproofing membrane. It uses a small electrical current which can only get through the membrane at a breach. It can find holes too small to spot by eye, so your roofer can repair them. You get a photo-illustrated written report of each breach found. We survey roof terraces and balconies, commercial flat roofs and liquid-applied waterproofing, and common reasons people get in touch are patched roofs that still leak and leaks under green or ballasted roofs.
Some older homes in villages like Merton are listed or in a conservation area, and that can affect how an extension roof or dormer is re-covered. Check with the council before planning any change of material. Finding out what state the roof is in gives you the facts to plan with. Listed building consent is needed for changes that affect a listed building’s special interest.
The report is written in plain words, so you do not need to be a roofer to follow it. Each point is backed by a photograph where possible, and recommendations are put with the most urgent first where relevant.
- Place
- Merton (OX25)
- Wider area
- Oxfordshire
- Cost
- Quoted for your roof
- Your report
- Written, with photos, emailed to you
- Appointments
- Weekdays and weekends
- Insurance
- Professional indemnity and public liability
- Phone
- 07833 053749
- Last updated
- 27 October 2026
What we can’t see
It is a careful look at the flat roof membrane, not the whole story. Its limits include:
- The extent of water in the insulation
- Water entering through details rather than the membrane
- Build-ups without a suitable layer below
If in doubt, call 07833 053749 or send us an email and we will recommend the right survey before you book. The full list of what we check.
Roofs we survey in Merton
- Flat roof membranes
- Roof terraces and balconies
- Liquid-applied waterproofing
- Single-ply roofs
- Green roofs
- Commercial flat roofs
Roof by roof
EPDM rubber roofs
Some EPDM membranes conduct electricity, which can rule out some methods. We will tell you if yours isn’t suitable.
Single-ply membranes
Many offices and units have single-ply roofs. Laps and fixings are where holes often appear.
How the survey works
Where it’s relevant and can be reached safely, the roof space is checked as well as the outside. Inside, we look for staining, damp, gaps and signs of movement. All in, the survey normally takes a time that depends on the size of the roof and how it’s built, which we’ll explain when we quote. Somewhere as small as Merton, access is often the only tricky part. Let us know about outbuildings, past repairs and any leaks you’ve noticed. Weekday and weekend visits are available.
- You let us know about the roof and where water is showing.
- The roof is assessed for suitability first.
- The test method is chosen to suit the roof.
- The membrane is tested and breaches are found.
- A report with photographs shows where each breach is.
Before the survey
- Keep pets in another room
- If you’re buying, let the agent know when we are coming
- For flats, make sure roof access has been agreed
Getting a price
To get a price for electronic leak detection in Merton, phone 07833 053749 or drop us an email. The address, the type of property and what you’d like to know help us price the survey accurately.
Related advice
What a survey costs
When we price a survey, we consider:
- Commercial roofs and larger buildings
- Chimneys, valleys, parapets and other details
- Whether thermal imaging or a drone is needed
- How many separate roofs there are, such as extensions, dormers and garages
For a price for your roof in Merton, phone 07833 053749 or send us an email with the address and a few details. We’ll confirm the figure before booking.
What we need to know
You do not need to know any roofing terms. It’s enough to let us know:
- Why you want a survey: buying, a leak, a storm or new work
- Where any leaks, stains or damp patches show inside
- How the loft is reached, if there is one
- Any photos you have, taken from ground level or a window
If you’re buying, it’s useful to book soon after your offer is accepted, so you have the findings in time to act on them before you exchange. For any other survey, just ring 07833 053749 or email us when you are ready.
Practical tips
Most of what helps is simple and safe from the ground. A few suggestions:
- Ask contractors to protect the membrane
- Consider ELD before paving or planting goes on
- Stay off the flat roof unless needed
- Keep a note of leaks after rain
File the report with your roof paperwork. It is a dated record of the membrane’s condition.
Act on leaks quickly. The longer water gets in, the more insulation and decking can be affected.
Do you need electronic leak detection in Merton?
Work on the roof can damage a membrane. Fixings, equipment and foot traffic can leave small holes.
Here are some of the things we see frequently:
- Damage from equipment installers
- Breaches around outlets and penetrations
- A flat roof leak that can’t be traced
- Leaks that return after repairs
For landlords with property near Bicester Village station, the flat roof over a let home is worth a look before it becomes a tenant complaint.
Before you book anyone
- Whether the inside of the roof is included
- How long the report takes to arrive
- Which parts of the roof they’ll actually see
- Their track record with similar roofs
Towns and villages near Merton
What else we do in Merton
Your questions about electronic leak detection in Merton
Do you cover Merton?
Yes, Merton is within the area we cover. We survey roofs across London and the South East. Just phone 07833 053749 or use the contact form and tell us about the property, and we will talk through which survey suits.
How do I find out if my home in Merton is listed?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. 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.
What does electronic leak detection do?
The waterproofing membrane normally stops an electrical current, so wherever there is a hole, it passes through. That lets us find breaches that are too small to see.
Do you use drones?
Where it helps and it’s safe, yes. Flights depend on the weather on the day and airspace rules, including flight restriction zones near airports. We hold a CAA Flyer ID and Operator ID.
How do I book a survey in Merton?
To arrange a survey, call 07833 053749 or drop us an email and tell us the address and what you’d like to know. We will confirm the price and find a day that suits.
Do you use low-voltage or high-voltage testing?
We choose the method that suits the roof. We will explain why when we quote.
Does electronic leak detection work on all membranes?
Not every roof is suitable. Certain membranes are conductive, and some build-ups lack a suitable layer below. We will tell you if yours is not suitable at the start.
Local flat roofs in Merton
With Boarstall Tower about 3.7 miles south-east, Merton sits in an area with a long building history. If you own one of the older houses, expect a mix of original materials and later repairs on the roof. Older buildings in west Oxfordshire frequently have Cotswold stone slate roofs, and some Oxfordshire villages still have thatch. Slate and clay tile are the usual coverings on older South East houses, with concrete tiles on many later estates. Mixed in with those pitched roofs are lots of flat ones, over rear extensions, dormers, garages and shops.
If you look after a shop, office or commercial unit, for example near Bicester Avenue, the flat roofs over shops and commercial units are worth checking before a leak, not after. Take an older house close to Church of St Swithin: the flat roofs on later extensions tend to wear out long before the main roof.
Merton is about 3 miles south of Bicester, in Oxfordshire. Merton gets the same service as everywhere else we work: a careful inspection, photographs and a written report. We cover towns and villages across Oxfordshire, large and small. Our Oxford page covers surveys nearby.
Postcode districts we cover here for electronic leak detection: OX25. Close by, we survey roofs in Fencott (1 mile south), Murcott (1 mile south-east), Charlton-on-Otmoor (1 mile south-west), Wendlebury (2 miles north-west) and Lower Arncott (2 miles east). We also work in nearby towns like Oxford (8 miles south), Bicester (3 miles north), Abingdon-on-Thames (13 miles south), Witney (15 miles west), Thame (11 miles south-east) and Kidlington (6 miles south-west).
Around Merton
Locally, jobs take us to homes and businesses close to The Old Plough pub. The closest station to Merton is Bicester Village station, about 2.7 miles north. Nearby you’ll also find Bicester Community Hospital (2.9 miles north) and Bicester Avenue (2.3 miles north). The countryside around Merton includes Graven Hill and Woodsides Meadow.