Greater London · London and the South East
Electronic leak detection in Old Coulsdon, Greater London
Need electronic leak detection in Old Coulsdon? We can help, with a written report you can act on. Weekday and weekend visits available.
- Leaks through a covered membrane
- Leaks that return after repairs
- Damp inside with no sign on the roof
Electronic leak detection in Old Coulsdon
There are different ELD methods. Low-voltage methods typically need a wet roof surface and high-voltage methods need the membrane dry and exposed. Which one suits depends on the membrane and the layers of the roof, and we will explain our choice. We will say if your roof doesn’t suit either method at the outset. Common reasons to book are leaks through a covered membrane and failed seams and laps, across commercial flat roofs, roof terraces and balconies and green roofs.
Commercial and residential blocks across London often have big flat roofs with plant, rooflights and access walkways. Every penetration and upstand is a place where a membrane can fail. In Old Coulsdon, roof access is agreed with the building manager or owner beforehand. Plant bases, rooflights and cable entries are all places where water can get in.
Every survey ends with a written report, with photographs, sent by email. It explains the condition of the flat roof membrane, the defects we found and what we recommend.
- Place
- Old Coulsdon (CR5, CR3, CR8)
- Wider area
- Greater London
- Cost
- Quoted for your roof
- Reports
- Written, with photos, emailed to you
- Appointments
- Monday to Sunday, daytime
- Cover
- Professional indemnity and public liability
- Call
- 07833 053749
- Last updated
- 27 October 2026
What affects the cost of electronic leak detection
When we price a survey, we consider:
- Commercial roofs and larger buildings
- Building height and the viewpoints available
- Extensions, dormers and garages with roofs of their own
- The roof’s overall size
All our prices include 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.
Booking your survey
We will typically ask about:
- Where the property is, with the postcode
- Anything about access we should know
- Any marks or damp showing indoors
- What made you get in touch
Surveys can be booked for weekdays, Saturdays or Sundays. To find a date that works for you, ring 07833 053749 or drop us an email.
What we can’t see
In fairness, a roof survey has limits:
- Moisture spread under the membrane
- Water entering through details rather than the membrane
- Fixing the holes we find
If in doubt, phone 07833 053749 or drop us an email and we’ll recommend the right survey before booking. What a survey covers and does not.
Roof types and parts we check
- Commercial flat roofs
- Liquid-applied waterproofing
- Single-ply roofs
- Flat roof membranes
- Green roofs
- Roof terraces and balconies
Tips from our surveys
You don’t need to be a roofer to help. What helps most:
- Share any drawings of the roof
- Do not keep patching the same spot
- Note where leaks show inside and when
- Ask contractors to protect the membrane
Questions about the results are welcome. We will explain what was found and what it means.
Clear flat roof outlets regularly. Water that sits on the roof finds breaches faster.
Different roofs, different checks
Green and ballasted roofs
Roofs with planting or ballast hide the membrane. Some methods can work through these layers but it depends on the layers.
EPDM rubber roofs
ELD on EPDM depends on the product and the layers. We check before we quote.
Flat and commercial roofs around Old Coulsdon
With Addington Palace about 5 miles north-east, Old Coulsdon sits in an area with a long building history. 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. In outer London, interwar semis with hipped, tiled roofs sit alongside older slate-roofed terraces. If your home in Old Coulsdon is one of them, bay roofs, hips and later dormers each have their own details. Next to the main roofs there’s typically a flat roof somewhere, whether on an extension, a garage or a commercial unit.
For site and facilities teams at buildings such as Keston Primary School, ponding and blocked outlets on a wide flat roof are worth catching before the next wet season. Controlled parking zones are common in London, so mention any permit rules for Old Coulsdon, along with any off-street space. If you let a flat or house near Coulsdon South station, flat roofs over rear additions and dormers in rented property are worth checking between tenancies.
Old Coulsdon is about 1 mile south-east of Coulsdon, in Greater London. Surveys in Old Coulsdon work the same way as everywhere we cover: a careful look at what can be seen safely, photographs and a clear written report. We cover towns and villages across Greater London. London is in our area too.
We work across CR5, CR3 and CR8 for electronic leak detection. Whether your property is on Ellis Road, Tollers Lane and Court Avenue or a nearby road, we can survey it. We also cover Coulsdon (1 mile north-west), Chipstead (2 miles west), Purley (2 miles north), Woodcote (2 miles north-west) and Woodmansterne (3 miles west). Within a short drive, we also cover London (14 miles north), City of Westminster (15 miles north), Marylebone (15 miles north), Kensington (14 miles north), Whitechapel (15 miles north) and Brompton (14 miles north).
What’s near Old Coulsdon
We work in homes and buildings around Sunnydown School, Dollypers Hill and The Tudor Rose pub and the streets around them. The closest station to Old Coulsdon is Coulsdon South station, about 1.4 miles north-west. Other landmarks nearby include East Surrey Museum (2 miles south-east) and St Lawrence's Hospital (1.3 miles south-east). Green spaces nearby include Nore Hill and Mercers Lake.
What we do, step by step
Every roof is different, but as a rough guide the survey takes longer on a large roof than a small one, with the construction of the roof playing a part too. You’re welcome to ask questions while we’re there. In Old Coulsdon, as in much of London, plenty of properties are flats or terraces without side access, so rear slopes are viewed from windows, the loft or, where a flight is allowed, by drone. Mention any building rules, key holders or managing agents when you book.
- 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 testing method is chosen to suit the membrane and build-up.
- Testing runs across the roof to locate breaches in the membrane.
- We send a report with photos of each breach so your roofer can repair it.
How to prepare
- Tell us where we can park nearby
- Make sure we can get to the back of the property
- Agree roof access with the managing agent if it’s shared
How to book
To book a survey, phone 07833 053749 or drop us an email and tell us the address and what’s prompted the survey. We will confirm the price before booking.
Related advice
Why get it checked now?
Repeated call-outs for the same leak add up. A clear record of where the breaches are helps break that cycle. A hidden valley or parapet gutter on a London house can hold water for weeks before anyone notices. By the time a ceiling stains, the timbers underneath may have been wet for a while.
Bigger, taller and commercial roofs take more time to survey, so they’re priced to match. You’ll know the figure before booking.
What you get with us
- CAA-registered drone operator (Flyer ID and Operator ID)
- Plain-English reports with photos
- An independent look at the roof
- Surveys seven days a week
See what a roof survey costs or what we found on two real jobs.
Your questions about electronic leak detection in Old Coulsdon
Is parking a problem for a survey in Old Coulsdon?
It can be, so it’s useful to let us know about permits, visitor bays or off-street space as you book. The visit is then planned around what’s available.
Is Old Coulsdon in the area you cover?
Yes, Old Coulsdon is within the area we cover. We work right across London and South East England. You can call 07833 053749 or use the contact form with the address and a few details.
Can you inspect my roof with a drone?
Yes, where it’s applicable. Whether we can fly on the day depends on the weather and the airspace rules. We hold a CAA Flyer ID and Operator ID.
Does ELD include fixing the breach?
No. We test the membrane and report. You get the breach locations with photos for your roofer to repair.
How does ELD work?
ELD passes a small electrical current across the roof to locate holes in the membrane. A breach lets the current through so we can pinpoint it.
How do you choose the testing method?
The method is chosen to suit the roof. Low-voltage methods are normally carried out on a wet roof and high-voltage methods need the membrane dry and exposed.
Does someone need to be in?
If the survey includes the loft or the inside of the building, someone needs to let us in. Access is agreed with you when you book.