Greater London · London and the South East
Colliers Wood Electronic Leak Detection
Electronic leak detection to pinpoint holes in flat roof membranes across Colliers Wood, with drones and thermal imaging where they help. Call or email for a price.
- Holes left by work on the roof
- Failed seams and laps
- Stains far from any visible defect
How the survey works
After the inspection, everything we found is written up as a written report with photos, sent to you by email. On timing, most surveys take as long as needed for the membrane area and the build-up, and we’ll give you a guide when quoting. From the street, a London terrace usually shows only its front slope or parapet, so in Colliers Wood we work round the house, using the street, the windows, the loft and any safe vantage point behind it. Shared stairs or a basement flat? Tell us who holds the keys.
- 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.
- We test the roof and locate any breaches.
- You get a report with photos of each breach.
Getting ready for the survey
- Have keys ready for side gates, garages or roof access doors
- Mention any parking restrictions on your street
- Let us know about any leaks, stains or damp patches you know of
Book a survey
Every survey is priced before it is booked, so you know the cost up front. We quote electronic leak detection for each roof, as the method and time depend on the roof. To book, phone 07833 053749 or email us.
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Electronic leak detection in Colliers Wood
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. That lets us locate holes that are too small to see, so your roofer can repair them. The results come in a report with photos. We are often asked to look into breaches hidden under paving or planting and damage from equipment installers, across green roofs, liquid-applied waterproofing and commercial flat roofs.
Commercial and residential blocks across London often have big flat roofs with plant, rooflights and access walkways. Each pipe, upstand and fixing through the covering is a possible weak point. For a building in Colliers Wood, access is agreed with whoever manages the roof ahead of the visit. Plant bases, rooflights and cable entries are all places where water can get in.
Every survey ends with a written report, with photos, sent by email. It sets out the condition of the flat roof membrane, any defects and our written recommendations.
- Place
- Colliers Wood (SW17, SW19, CR4)
- Region
- Greater London
- Price
- Quoted for your roof
- Reports
- Written, with photos, emailed to you
- When we survey
- Weekdays and weekends
- Cover
- PI and public liability insurance
- Telephone
- 07833 053749
- Updated
- 27 October 2026
Questions from Colliers Wood
Is my home in Colliers Wood listed or in a conservation area?
Your council is the best source, with Historic England’s list for listed buildings. A change of roofing material may need consent in either case.
Do you carry out roof surveys in Colliers Wood?
Yes, Colliers Wood is within the area we cover. We survey roofs across London and South East England. You can phone 07833 053749 or send us an email with the address and some details, and we will talk through which survey suits.
What will the report tell me?
You get our findings in writing, part by part, with photos, finishing with recommendations. Points are put in order of urgency where relevant.
What does electronic leak detection do?
The waterproofing membrane normally stops an electrical current, but a hole lets it through. That lets us find breaches that are too small to see.
Do you test for asbestos?
No. We can flag materials that might contain asbestos, but confirming it is a job for a specialist asbestos surveyor. Buildings built or refurbished before 2000 may contain it.
What happens after the survey?
You will receive the report by email, and what you do next is up to you: raise it with a seller, send it to an insurer, brief a roofer or share it with a managing agent.
What if it rains on the day?
It depends on the weather and the survey. In strong wind or heavy rain, a drone can’t fly and access may not be safe, and we’d agree another day.
How the survey changes by roof type
Liquid-applied waterproofing
Testing a liquid-applied roof depends on what’s beneath the coating.
EPDM rubber roofs
Some EPDM membranes conduct electricity which can limit electronic testing. We will tell you if yours is not suitable.
Tips that help
Small things make a difference. Our tips:
- Check new waterproofing before handover
- Have roof specifications to hand
- Avoid repeated repairs without finding the cause
- Clear flat roof outlets regularly
If we think the leak is not coming through the membrane, the report says so, with a suggestion of what to check next.
Keep outlets and gutters on flat roofs clear. Standing water puts more pressure on any weak point.
Electronic leak detection in Colliers Wood: local notes
With Southside House about 2.8 miles west, Colliers Wood sits in an area with a long building history. Older homes in the wider area often have features worth a closer look, like lead valleys, tall stacks and roofs that have been patched over the years, and the council can say whether a home is in a conservation area. Many homes in inner London are Victorian and Edwardian terraces, often with Welsh slate roofs. A butterfly roof with a central valley gutter, tucked behind a parapet wall, is common on these houses. Lead flashings, party-wall upstands and shared chimney stacks are typical of these houses, if yours is one of them. Mixed in with those pitched roofs are a good many flat ones, over rear extensions, dormers, garages and shops.
Take a building like Sellincourt Primary School: a large flat roof with lots of outlets and rooflights has many places where a membrane can fail. Colliers Wood is in London, so parking needs planning: a visitor permit or a nearby bay makes the day easier. If you own a rental within reach of Tooting station, flat roofs on let property tend to be checked only when they fail, which is the costly way round.
Colliers Wood is about 5 miles south of Brompton, in Greater London. We carry out electronic leak detection for householders, landlords and businesses in Colliers Wood and the surrounding area. Colliers Wood is one of the towns and villages in Greater London where we work. You can also see our page for London.
Electronic leak detection in SW17, SW19 and CR4 work the same way as everywhere else we cover. Whether your property is on Acre Road, Boyd Road and Park Road or anywhere close by, we can survey it. Other places close to Colliers Wood include Tooting (1 mile north), Tooting Bec (1 mile north), Merton Abbey (1 mile south-west), Furzedown (1 mile north-east) and Eastfields (1 mile south-east). Within a short drive, we also cover London (6 miles north-east), City of Westminster (7 miles north), Marylebone (7 miles north), Kensington (6 miles north), St Pancras (8 miles north) and Shoreditch (8 miles north-east).
Local landmarks in Colliers Wood
Around Colliers Wood, our work takes us to homes and buildings near Figge's Marsh, Ensham School and The Royal Standard pub and the streets around them. There is a railway station in Colliers Wood itself: Tooting station. Well-known places in the area include Grove Hospital (0.6 miles north) and Wandle Industrial Museum (1.2 miles south). The countryside around Colliers Wood includes Henman Hill and Myrna Close.
What a survey costs
All our prices include VAT. What changes the price is:
- The number of roofs, including extensions and garages
- The size of the roof
- If the survey needs thermal imaging or a drone
- The type of building, from a house to a block or an office
Larger roofs, taller buildings and commercial roofs take longer, so the price reflects that. The price is confirmed before booking.
What we need to know
A little information up front helps. It helps to include:
- Any stains, drips or damp patches you’ve seen indoors
- Photos of the roof, taken safely from ground level or a window
- Whether there is a loft hatch, a shared roof or tricky access
- Your postcode, so we can check access and travel
Booking is simple: just phone 07833 053749 or send us an email and give us some details about the property and we will recommend the right survey. We confirm the price before anything is booked.
Towns and villages near Colliers Wood
Other services in Colliers Wood
What electronic leak detection doesn’t cover
In fairness, there are limits to any roof survey:
- Water entering through details rather than the membrane
- Roofs whose membrane or build-up isn’t suitable
- How wet the insulation is
If you are not sure which survey you need, ring 07833 053749 or drop us an email and we’ll give you a straight answer before you book. The full list of what we check.
What this survey covers
- Single-ply roofs
- Roof terraces and balconies
- Liquid-applied waterproofing
- Commercial flat roofs
- Flat roof membranes
- Green roofs
DIY checks: what’s safe
Watch the gutters in a downpour, from a window or the ground. Overflowing water can point to a blockage or a sagging run.
Inside, the loft is a good place to look, with care. Use a torch and stay on the joists or boards, and look for staining, damp timber or daylight coming through.