Greater London · London and the South East
Electronic leak detection in Balham, Greater London
We take a careful look at the flat roof membrane at your property in Balham, with photographs and a written report.
- Repairs that haven’t stopped the leak
- Leaks at pipes, outlets or fixings
- Leaks through a covered membrane
Before and after the survey
Small things make a difference, both for the survey and for the roof itself. Some pointers:
- Have roof specifications to hand
- Get leaks traced quickly
- Stay off the flat roof unless needed
- Don’t keep patching the same spot
Once repairs are made, the roof can be tested again if you want to check them, where the roof still suits the method.
Keep people off the flat roof unless they need to be there. Feet and dropped tools are a common cause of holes.
Electronic leak detection for homes and businesses in Balham
Electronic testing locates holes in the waterproofing but not every way water gets in. Water coming through walls, copings, rooflights or plumbing will not show on the test. If the evidence points elsewhere, we will say so. It will not show water getting in through brickwork or around frames. Our report keeps that distinction clear. You will also know what to check next. Common reasons to book are new membranes needing a check before handover and stains far from any visible defect, on commercial flat roofs, single-ply roofs and green roofs.
Commercial and residential blocks across London frequently 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 Balham, access is agreed with whoever manages the roof before the visit. Plant bases, rooflights and cable entries are all places where water can get in.
It isn’t only a list of defects. For each finding, it explains what it is, why it matters and what we’d recommend.
- Location
- Balham (SW12, SW17, SW4)
- Region
- Greater London
- Price
- Quoted for your roof
- Reports
- A written report with photos, by email
- Appointments
- Weekdays and weekends
- Insured
- PI and public liability insurance
- Telephone
- 07833 053749
- Page updated
- 27 October 2026
Also in Balham
Balham: your questions answered
Can parking be tricky for a visit in Balham?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Is Balham in the area you cover?
We do. The survey and report are the same in Balham as anywhere else, and visits run on weekdays and weekends.
Does ELD work under paving or planting?
In some cases. The layers on top and the build-up below decide it, and some may need lifting. We’ll discuss it before we quote.
Do you use drones?
Yes, where it is applicable. We hold a CAA Flyer ID and Operator ID and fly a drone under 250g, and the airspace and weather are checked before every flight.
Does ELD include fixing the breach?
No, our part is finding the breaches. The report gives your roofer the locations.
Can you survey in bad weather?
Light rain doesn’t usually stop a survey, and it can even help show where water is getting in. Heavy rain or strong wind can ground a drone and make the roof unsafe, so if conditions are not right we’ll arrange another day with you.
How do I arrange electronic leak detection in Balham?
To book, phone 07833 053749 or drop us an email and tell us the address and what you’d like to know. We’ll confirm the price and agree a day with you.
When you need someone else
To be straight with you, a roof survey has limits:
- Leaks from walls, copings or rooflights
- Some conductive membranes
- Areas we can’t reach or that can’t be tested
Not sure which survey suits your roof? You can ring 07833 053749 or use the contact form and we’ll tell you before you book. The full list of what we check.
Roof types and parts we check
- Roof terraces and balconies
- Single-ply roofs
- Green roofs
- Commercial flat roofs
- Liquid-applied waterproofing
- Flat roof membranes
Checking the roof from the ground
The one thing to avoid is getting up close. Roofs are fragile and slippery, and a fall can be serious. That’s where a survey comes in, using safe viewpoints and a drone where it applies.
Inside, the loft is a good place to look, with care. Take a torch and only step on boards or joists, and look for staining, damp timber or daylight coming through.
The survey, step by step
A survey visit follows a simple order: we listen to what’s been worrying you, look at the roof from every safe viewpoint, photograph what we find and make notes for the report. Most visits take a time that depends on the membrane area and the build-up, and we’ll give you a guide when quoting. In Balham, as in much of London, plenty of properties are flats or terraces without side access, so the back of the roof is frequently seen from upstairs windows, from inside or, where a flight is allowed, from the air. Mention any building rules, key holders or managing agents when you book.
- We ask about the roof, its age, its membrane and where leaks appear inside.
- We confirm whether the roof is suitable for electronic testing.
- The method depends on the membrane and what sits above and below it.
- The roof is tested and any breaches are located.
- The breaches are recorded with photos in a report for your roofer.
How to prepare
- Let us know about any leaks, stains or damp patches you know of
- If the roof is shared, arrange access with whoever manages the building
- Check pets are kept safely away
Getting a price
If you have photos of the roof, send them over. Pictures from the ground or a window are fine; never climb up to get a better view. To send them or to book, phone 07833 053749 or send us an email.
Related advice
Flat roofs in Balham
Inner London’s Victorian and Edwardian terraces often have Welsh slate roofs. A butterfly roof with a central valley gutter, tucked behind a parapet wall, is common on these houses. If your home in Balham is one of them, lead flashings, party-wall upstands and shared chimney stacks are part of the picture too. Flat roofs on extensions, dormers, garages and business units are found alongside them almost everywhere. With Carlyle's House about 2.9 miles north, Balham sits in an area with a long building history. Older roofs in the wider area can hide decades of patch repairs, so the detail matters, and the council can say whether a home is in a conservation area.
For a London address like Balham, it helps to know about controlled parking before the day, along with any off-street space. If you run a business near Southside Wandsworth, the flat roofs over shops and commercial units are worth checking before a leak, not after. Landlords with a home close to Balham station may find that the flat roof over a let home is worth a look before it becomes a tenant complaint.
Balham is about 2 miles south-west of Stockwell, in Greater London. Balham is one of many places we visit across Greater London, for homes and businesses alike. Balham is one of the towns and villages in Greater London we cover for electronic leak detection.
Surveys in SW12, SW17 and SW4 work the same way as everywhere else we cover. Whether your property is on Lynn Road, Weir Road and Byrne Road or a nearby road, we can survey it. If you’re just outside Balham, we cover Grange Mills (1 mile north-east), Hyde farm estate (1 mile east), Clapham Park (1 mile north-east), Streatham Park (1 mile south-east) and Tooting Bec (1 mile south-west). Within a short drive, we also cover London (5 miles north-east), City of Westminster (5 miles north), Marylebone (5 miles north), Kensington (4 miles north-west), St Pancras (6 miles north) and Shoreditch (7 miles north-east).
What’s near Balham
Around Balham, our work takes us to homes and buildings near Oak Lodge School, Wandsworth Common and The Bedford pub, among other places. There’s a railway station in Balham itself: Balham station. A little further out are St James' Hospital (0.5 miles west) and London Sewing Machine Museum (0.6 miles south-west). The countryside around Balham includes Knight's Hill and Battersea Park Lake.
Prices for electronic leak detection in Balham
Prices vary from roof to roof, and it comes down to:
- If the survey needs thermal imaging or a drone
- Roof area
- Features like valleys, chimneys, dormers and parapets
- Height and safe access
What a survey costs comes down to the roof itself: its size, its height, how many sections it has and how it can be reached and seen safely. We quote electronic leak detection for each roof, as the method and time depend on the roof.
Helping us price your survey
If you can, have these to hand when you get in touch:
- The style of property, from a terrace to a block
- Pictures from the garden or a window, if you have them
- Any marks or damp showing indoors
- Access details, like a loft hatch or a shared roof
Buyers should book once an offer has been accepted, so you have the findings in time to act on them before you exchange. Otherwise, simply ring 07833 053749 or drop us an email whenever suits you.
What happens if roof problems are left?
ELD before paving, ballast or planting goes on is simpler. Covered roofs are harder to test. Work on a London roof is rarely simple to arrange, with parking, neighbours and access all to think about. Knowing what’s needed early gives you time to plan it calmly, rather than in a rush after a leak.
Every price we give includes VAT. Electronic leak detection is quoted for your roof, because the method depends on the roof. We confirm the price for your roof before booking.
What you get with us
- Insured for professional indemnity and public liability
- Two decades and more of roof surveys
- 5,000+ roofs surveyed
- A sub-250g drone, flown with a CAA Flyer ID and Operator ID
Read what a roof survey costs and our case studies.