Greater London · London and the South East
Electronic Leak Detection in Coulsdon
Electronic leak detection around Coulsdon, with a written report you can act on. Weekday and weekend visits available.
- Damage from equipment installers
- Gaps at membrane joints
- New membranes needing a check before handover
Tips from our surveys
A survey works best with a little help from you, before and after. Tips:
- Stay off the flat roof unless needed
- Clear flat roof outlets regularly
- Test new membranes before covering them
- Ask contractors to protect the membrane
If water has been getting in, insulation under the membrane may be wet. That’s something to discuss with your roofer and other checks can help judge it.
ELD before paving, ballast or planting goes on is worth considering. It is easier to find holes before more layers are added.
How electronic leak detection works in Coulsdon
Some flat roofs can’t be tested electronically. Certain membranes conduct electricity and some roofs do not have a suitable layer beneath the membrane. We will say if ELD will not work on your roof before any testing. Telling us what you know about the roof’s membrane and layers helps, including drawings, specifications or the roofer’s paperwork. It avoids arranging a test that cannot give results. We survey green roofs, roof terraces and balconies and single-ply roofs, and the problems we’re asked to look at most are leaks through a covered membrane and waterproofing to test before it’s covered.
Across London, flat roofs are everywhere, from back additions and dormers to roof terraces, blocks of flats and offices. They’re covered in felt, asphalt, EPDM rubber, GRP fibreglass or single-ply membranes, each with its own weak points. Which one is on a roof in Coulsdon shapes how it’s checked. Older flat roofs are frequently felt or asphalt, newer ones rubber or GRP.
You can share the report with anyone who needs it: your solicitor, the seller, your insurer, a roofer or the building’s managing agent.
- Location
- Coulsdon (CR5, CR8, CR3)
- Region
- Greater London
- Cost
- Quoted for your roof
- Reports
- Written, with photos, emailed to you
- When we survey
- Monday to Sunday, daytime
- Insured
- Professional indemnity and public liability
- Call
- 07833 053749
- Page updated
- 27 October 2026
Towns and villages near Coulsdon
What else we do in Coulsdon
Rented homes, blocks and businesses
Letting agents can arrange access with tenants, at a time agreed in advance. We survey on weekdays, Saturdays and Sundays, which can make access easier.
Buyers’ agents can book surveys on behalf of their clients. Reports are emailed, so they’re easy to pass on.
What affects the cost of electronic leak detection
When we price a survey, we consider:
- The use of thermal imaging or a drone
- The roof’s overall size
- How many separate roofs there are, such as extensions, dormers and garages
- Features like valleys, chimneys, dormers and parapets
What a survey costs comes down to the roof itself: its size, its height, how many sections it has and how safely it can be seen. We quote electronic leak detection for each roof, as the method and time depend on the roof.
Booking your survey
A little information up front helps. It’s useful to include:
- Pictures from the garden or a window, if you have them
- Where any leaks, stains or damp patches show inside
- Your postcode, so we can check access and travel
- Any deadline, like an exchange date
To arrange a survey, phone 07833 053749 or send us an email with the address and what you’d like to know about the roof. You will know the price before anything is booked.
Common questions in Coulsdon
How do I find out if my home in Coulsdon 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.
Do you cover Coulsdon?
Yes. We work right across London and the South East, and Coulsdon is part of that. Just ring 07833 053749 or email us and let us know about the property, and we will talk through which survey suits.
Do you look in the loft space?
Typically, if there is one and it can be reached safely. From inside, the underside of the roof often shows damp, staining or daylight that cannot be seen from outside.
Can you survey a shared roof?
Yes. Shared roofs just need a little more planning. Tell us about it when you book and we will plan the survey around it.
What happens next?
You receive the written report by email, with photographs and recommendations. It’s yours to share with a seller, insurer, roofer or managing agent, whichever applies.
Can you test a green or ballasted roof?
It can be possible, depending on the roof. Covered roofs limit the methods we can use so we look at the roof first.
What will the report tell me?
It sets out what we found, why it matters and what we recommend, with photos throughout. It also says if any part of the roof couldn’t be seen safely.
What we are asked to look at in Coulsdon
Other trades on the roof can puncture the waterproofing. Fixings, equipment and foot traffic can leave small holes.
Common reasons to book include:
- Leaks that return after repairs
- Holes around roof penetrations
- Gaps at membrane joints
- Stains far from any visible defect
If you let a flat or house near Coulsdon South station, flat roofs on let property tend to be checked only when they fail, which is the costly way round.
What to check before booking
- How long the report takes to arrive
- What they won’t be able to tell you
- What happens after the report arrives
- Whether any drone flown is registered with the CAA
How it works
We look at the roof from outside and, where it’s relevant and there’s safe access, from inside the loft space too. In the loft, the signs we look for are staining, damp, daylight and sagging, as far as the space allows. The whole visit normally takes as long as needed for the size of the roof and how it’s built, which we’ll explain when we quote. From the street, a London terrace normally shows only its front slope or parapet, so a visit in Coulsdon moves between viewpoints: the pavement, upstairs windows, the loft and any safe spot at the back. Shared stairs or a basement flat? Tell us who holds the keys.
- We ask about the roof, its age, its membrane and where leaks appear inside.
- We confirm whether the roof is suitable for electronic testing.
- We pick the low-voltage or high-voltage method that suits the roof.
- 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
- Keep pets in another room
- Have keys ready for side gates, garages or roof access doors
- If you are buying, check with the agent that we can get in
Getting a price
Booking is simple: just phone 07833 053749 or send us an email and give us some details about the property and we will explain which survey suits. The price is agreed up front.
Advice
Should I look at the roof myself first?
After heavy rain, check ceilings and the tops of walls for new stains. Take a photo and write down when you saw it, as it helps a surveyor trace the cause.
If you have a loft with safe access, take a look inside. Take a torch and only step on boards or joists, checking for stains, damp wood or chinks of daylight.
Flat and commercial roofs around Coulsdon
In outer London, interwar semis with hipped, tiled roofs sit alongside older slate-roofed terraces. On a semi of that age, the small roofs over the bays, the hip tiles and any later dormer each need their own look. Next to the main roofs there is normally a flat roof somewhere, whether on an extension, a garage or a commercial unit. Historic houses such as Nonsuch Mansion, about 4.9 miles north-west, show how far back building in the area around Coulsdon goes. Period homes nearby can have lead valleys, tall chimneys and a patchwork of past repairs, and any change of roofing material on a listed home needs checking with the council first.
If you look after a building like Smitham Primary School, large flat roofs, common on schools and other public buildings, need their outlets, upstands and coverings checked regularly. For an older house near a landmark like St Andrew's Church, the flat roofs on later extensions tend to wear out long before the main roof.
Coulsdon is about 13 miles south of London, in Greater London. Coulsdon is part of the area we cover as part of our work across London and South East England. Across Greater London, we cover Coulsdon. There is also a page for London.
All of CR5, CR8 and CR3 is within our area for electronic leak detection. We offer electronic leak detection to properties on Hadleigh Grove, Farthing Way and Dobson Close and the roads around them. Coulsdon is on the B276 and B2030, so it is easy for us to get to. We also cover the places around Coulsdon: Woodcote (1 mile north), Old Coulsdon (1 mile south-east), Woodmansterne (1 mile west), Chipstead (1 mile south-west) and Purley (2 miles north-east). Within a short drive, we also cover London (13 miles north), City of Westminster (14 miles north), Marylebone (14 miles north), Kensington (13 miles north), St Pancras (15 miles north) and Shoreditch (15 miles north).
Local landmarks in Coulsdon
In Coulsdon, that means homes and buildings near Dollypers Hill, Coulsdon Sixth Form College and The Pembroke pub and the streets around them. Coulsdon has its own railway station: Coulsdon South station. Nearby you will also find Croydon Airport Visitor Centre (3 miles north) and Purley War Memorial Hospital (2 miles north-east). For a walk, there is Duppas Hill and Mercers Lake.