Greater London · London and the South East
Electronic leak detection in Clapham, Greater London
Electronic leak detection to pinpoint holes in flat roof membranes around Clapham, with a written report you can act on. Weekday and weekend visits available.
- New membranes needing a check before handover
- A flat roof leak that cannot be traced
- Holes left by work on the roof
How electronic leak detection works in Clapham
Our ELD testing covers flat roofs in Clapham and the rest of London and South East England. A visit typically takes longer on a large roof than a small one, with the construction of the roof playing a part too. Every roof is quoted on its size and build-up. The results come in a written report with photos. If you’re worried about a flat roof leak that can’t be traced and damage from equipment installers, we can find out what’s behind it, on roof terraces and balconies, commercial flat roofs and green roofs alike.
Offices, shops and blocks of flats across London frequently have large flat roofs with plant, rooflights and walkways. Every penetration and upstand is a place where a membrane can fail. In Clapham, roof access is agreed with the building manager or owner beforehand. Rooflights, plant supports and pipe entries are common places for a membrane to fail.
Nothing in the report is left vague: if work is needed, the report says so clearly.
- Where
- Clapham (SW4, SW8, SW9)
- Wider area
- Greater London
- Cost
- Quoted for your roof
- Report
- Emailed report with photos and recommendations
- When we survey
- Weekdays, Saturdays and Sundays
- Insured
- Professional indemnity and public liability
- Phone
- 07833 053749
- Last updated
- 27 October 2026
How it works
Every roof is different, but as a rough guide the survey takes a time that depends on the size of the roof and how it’s built, which we set out in the quote. You’re welcome to ask questions while we’re there. Surveys in Clapham can be booked for any day of the week. London parking is frequently by permit or pay-and-display, so it helps to know what’s near you, and to clear a path to the loft hatch. A back bedroom window can be the best vantage point for a rear addition, so we may ask to use one.
- You let us know about the roof and where water is showing.
- We check whether the membrane and build-up suit ELD.
- We choose a low-voltage or high-voltage method to match the roof.
- We test the roof and locate any breaches.
- You get a report with photos of each breach.
Getting ready for the survey
- Jot down any questions you want answered
- Check pets are kept safely away
- Have keys ready for side gates, garages or roof access doors
How to book
Every survey is priced before it is booked, so you know where you stand. We quote electronic leak detection for each roof, as the method and time depend on the roof. To book, call 07833 053749 or use the contact form.
Related advice
What else we do in Clapham
Why get it checked now?
Chasing a leak again and again is frustrating. A report showing the breach points gives your roofer a clear target. London’s older roofs often have bitumen felt underlay or none at all, so a slipped slate can soon mean water inside. Left unchecked, water soaks into timber and plaster and the damage spreads.
For a price for your roof in Clapham, phone 07833 053749 or email us with the address and some details. The price is agreed before a date is set.
Why book us in Clapham
- Surveys on weekdays, Saturdays and Sundays
- Thermal imaging and drone inspection where they help
- Photos and a written report every time
- Over 5,000 surveys carried out
Take a look at our cost guide or our case studies.
Checking the roof from the ground
What you cannot do safely is get up close. Slates, tiles, flat roofs and rooflights can give way, and falls from height are serious. 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, which helps when we check the roof.
Do you need electronic leak detection in Clapham?
Flat roof membranes can be punctured by foot traffic, dropped tools or debris. Some are too small to see but water still finds them.
It is worth booking a survey if you’ve seen:
- Breaches around outlets and penetrations
- New membranes needing a check before handover
- Gaps at membrane joints
- Leaks under green or ballasted roofs
A roof leak in a hotel or guest house around Clapham means lost rooms as well as repairs.
Choosing a roof surveyor
- What insurance they carry
- Which parts of the roof they’ll actually see
- How soon the report will arrive
- Whether the loft is part of the inspection
Prices for electronic leak detection in Clapham
Prices vary from roof to roof, and it comes down to:
- If the survey needs thermal imaging or a drone
- Extensions, dormers and garages with roofs of their own
- Height and safe access
- How big the roof is
The cost of a survey depends on the roof: how big it is, how high it is, the number of separate roofs and how safely it can be seen. Electronic leak detection is quoted for your roof, because the method depends on the roof.
What we need to know
Some details help us suggest the right survey and price. When you get in touch, it’s useful to mention:
- The reason for the survey, such as buying, a leak or storm damage
- Your timetable, such as an exchange date
- What kind of property and roof it is
- Your postcode, so we can check access and travel
A quick phone call is normally the easiest start: ring 07833 053749 or email us and we’ll ask a few questions about the roof. You’ll have a price before anything is arranged.
Flat roofs in Clapham
The wider area around Clapham has a long history of building, with Carlyle's House about 1.9 miles north-west. Older roofs in the wider area can hide decades of patch repairs, so the detail matters. Welsh slate on Victorian and Edwardian terraces is a familiar sight across inner London. Behind many of their parapets sit butterfly roofs and valley gutters that cannot be seen from the pavement. Shared chimney stacks, party-wall upstands and lead work come with this kind of house. Next to the main roofs there’s usually a flat roof somewhere, whether on an extension, a garage or a commercial unit.
For businesses in and around places such as Harrods, flat roofs over shops and units are easy to forget until water comes through a ceiling. The streets around a church such as St Paul's Church are frequently among the oldest in a place, and if you own one of the older houses nearby, later flat-roofed additions are common on older houses, and their edges and upstands frequently show the first signs of wear.
Clapham is about 3 miles north of Streatham, in Greater London. Whether the building in Clapham is a house, a flat or a commercial unit, the roof can be surveyed. Clapham is one of the places in Greater London where we work.
Electronic leak detection in SW4, SW8 and SW9 work the same way as everywhere else we cover. You’ll find streets like Grafton Square, Clapham High Street and Houghton Square, all of which we cover. With the B224 and B303 close by, Clapham is simple for us to get to for electronic leak detection. We also cover the places around Clapham: Stockwell (1 mile east), Little Portugal (1 mile north-east), Clapham Park (1 mile south), South Lambeth (1 mile north-east) and Brixton (1 mile south-east). Larger places within reach include London (3 miles north-east), City of Westminster (3 miles north), Marylebone (4 miles north), Kensington (4 miles north-west), St Pancras (4 miles north) and Shoreditch (5 miles north-east).
Around Clapham
In Clapham, that means homes and buildings near Lambeth Academy, Larkhall Park and Trinity Academy. There is a railway station in Clapham itself: Clapham High Street station. A little further out are Baynard's Castle (3.5 miles north-east) and Harrods (2.6 miles north-west). Green spaces nearby include Battersea Park Lake and Knight's Hill.
Clapham: your questions answered
Does a conservation area affect roof work in Clapham?
Start with Historic England’s list for listing and your council for conservation areas. Either can affect what roof work is allowed, so it is worth checking before planning any.
Can you look at the flat roof of a hotel or office near Clapham?
Yes, we cover commercial roofs as well as homes. Access to the roof is sorted out with whoever manages the building before the day.
Do you use drones?
Yes, where it is applicable. Flights depend on the weather on the day and airspace rules, and we check for restrictions near airports before flying. We hold a CAA Flyer ID and Operator ID.
How quickly is the report sent?
Basic reports arrive within 48 hours, Standard reports in 24–48 hours and Premium reports on the same day. All of them come by email.
Do I have to be there for the survey?
It depends on what we need to see. Inside the building and in the loft, we need someone to let us in, while outside access can be discussed when you book.
Will you walk on the roof?
Not unless it is safe. Safe viewpoints, the loft space and a drone where it applies cover most of what’s needed, and anything out of sight is recorded in the report.
How do I book a survey in Clapham?
To arrange a survey, ring 07833 053749 or email us and let us know the address and what you want to find out. We will confirm the price and find a day that suits.
When you need someone else
Some things can’t be seen without opening up the roof, so a survey has limits:
- Leaks from walls, copings or rooflights
- The extent of water in the insulation
- Some conductive membranes
If in doubt, phone 07833 053749 or email us and we’ll recommend the right survey. What a survey covers and doesn’t.
What we look at
- Green roofs
- Commercial flat roofs
- Single-ply roofs
- Flat roof membranes
- Roof terraces and balconies
- Liquid-applied waterproofing