Greater London · London and the South East
West Hampstead Electronic Leak Detection
Electronic leak detection in West Hampstead from an independent, experienced roof surveyor. More than 20 years and over 5,000 surveys.
- Repairs that haven’t stopped the leak
- Breaches hidden under paving or planting
- Leaking laps in the waterproofing
Electronic leak detection in West Hampstead: what you get
ELD is a way of pinpointing breaches in a flat roof’s waterproofing membrane. It uses a small electrical current which can only get through the membrane at a breach. It can find holes too small to spot by eye so your roofer knows exactly where to repair. You get a report with photos of each breach found. Typical surveys look at leaks showing away from the breach and new membranes needing a check before handover, on commercial flat roofs, green roofs and roof terraces and balconies.
London has a lot of flat roofs: rear additions, dormers, roof terraces and the roofs of blocks and offices. Coverings range from felt and asphalt to EPDM rubber, GRP fibreglass and single-ply membranes, each with its own weak points. In West Hampstead, as anywhere in London, the right approach depends on what the roof is made of. Older flat roofs are frequently felt or asphalt, newer ones rubber or GRP.
Findings are set out part by part, from the main slopes down to the gutters and outlets, each with a short note and a photo. It records what’s sound as well as what isn’t.
- Location
- West Hampstead (NW3, NW6, NW2)
- Wider area
- Greater London
- Prices
- Quoted for your roof
- Your report
- Written, with photos, emailed to you
- Appointments
- Weekdays and weekends
- Insured
- PI and public liability insurance
- Phone
- 07833 053749
- Updated
- 27 October 2026
What electronic leak detection doesn’t cover
Our findings are based on what we can see safely on the day, so some things are outside what a survey can do:
- Sections we cannot safely access
- Some conductive membranes
- Moisture spread under the membrane
Not sure which survey suits your roof? You can phone 07833 053749 or email us and we will tell you before you book. The full list of what we check.
What we check
- Flat roof membranes
- Roof terraces and balconies
- Liquid-applied waterproofing
- Green roofs
- Single-ply roofs
- Commercial flat roofs
Why get it checked now?
Opening up a roof to hunt for a leak is disruptive. Electronic testing finds the hole first, so the repair can be targeted. In a London terrace or conversion, a roof defect rarely stays your problem alone: failed flashings and blocked valley gutters can send water into more than one home. Finding it early keeps the work smaller.
For a price for your roof in West Hampstead, phone 07833 053749 or drop us an email with the address and a few details. The price is agreed before a date is set.
Why book us in West Hampstead
- Over 20 years’ experience
- We hold a CAA Flyer ID and Operator ID
- An independent look at the roof
- 5,000+ surveys completed
Before and after the survey
You don’t need to be a roofer to help. What helps most:
- Test new membranes before covering them
- Act on new leaks promptly
- Do not keep patching the same spot
- Stay off the flat roof unless needed
Where the evidence points to walls, copings or rooflights, we will note it, so other causes can be checked.
Keep outlets and gutters on flat roofs clear. Water that sits on the roof finds breaches faster.
Places near West Hampstead
More services for West Hampstead
Questions from West Hampstead
Do you look at commercial flat roofs near West Hampstead, like hotels?
Yes. As well as homes, we check flat roofs on offices, hotels, blocks of flats and commercial units. For a bigger roof, you will get a quote based on the building.
Is my home in West Hampstead listed or in a conservation area?
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.
What’s the best way to book?
To book, ring 07833 053749 or send us an email with the address, the type of property and what’s prompted the survey. We’ll confirm the price and agree a day with you.
Is it a structural engineer’s report?
No. We point out what can be seen, like sagging or deflection, but we’re not structural engineers and do not carry out calculations. Where an engineer is needed, we say so in the report.
How long have you been surveying roofs?
Over 20 years and more than 5,000 surveys.
Will you walk on the roof?
Only when it is safe. Most of what we need can be seen from safe viewpoints, the loft and, where applicable, a drone, and the report notes anything we couldn’t see.
What does electronic leak detection do?
ELD passes a small electrical current across the roof to locate holes in the membrane. A breach lets the current through, which shows us where the hole is.
Checking the roof from ground level
Keep a simple record: when leaks happen, ground-level photos and any past roof work. Share it with us as you book and it will help the survey.
During heavy rain, look at the gutters from ground level or a window. Water spilling over the edge can be a sign of a blockage or a gutter that has dropped.
The survey, step by step
Every visit follows the same pattern: we hear what you’ve seen, inspect the roof from every safe vantage point, photograph what we find and make notes for the report. Most visits take a time that depends on the size of the roof and how it’s built, which we set out in the quote. In a London conversion, the way into the loft space is frequently from a communal landing or the top flat. If that applies to your building, it helps to agree access with the neighbours or the managing agent first. Everything else is planned around the building, not the postcode.
- 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.
Before we arrive
- Gather any invoices or paperwork from past roof work
- Leave a clear route to the loft
- Let us know about parking near the property
Arrange a survey
Most bookings start with a short call: phone 07833 053749 or send us an email, and we’ll ask about the building and what you need. The price is agreed before a date is set.
Related advice
What electronic leak detection looks like in West Hampstead
Close to the centre of London, a great many houses are Victorian or Edwardian terraces, many of them roofed in Welsh slate. Many have butterfly roofs draining to a central valley gutter, with parapet walls and gutters hidden behind them. If your home in West Hampstead 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. Historic houses such as Fenton House, about 0.5 miles north-east, show how far back building in the area around West Hampstead goes. Older roofs in the wider area can hide decades of patch repairs, so the detail matters, and a listed home or one in a conservation area may need consent for changes of material.
Hotels and guest houses near West Hampstead cannot easily close rooms for a leak. If your house is among the older ones in the streets near Presbyterian Church Of St Andrew, flat-roofed rear additions and dormers added over the years are worth checking. Shop and office owners around O2 Centre may find that a flat roof over a business is out of sight and out of mind until it leaks.
West Hampstead is about 3 miles north-west of City of Westminster, in Greater London. Wherever you are in West Hampstead, we can come and survey your property, on a weekday, Saturday or Sunday. Across Greater London, we cover West Hampstead. We also survey roofs in London.
Electronic leak detection in NW3, NW6 and NW2 work the same way as everywhere else we cover. Local streets include Mill Lane, Acol Road and Ajax Road, all of which we cover. Being close to the A502, West Hampstead is easy for us to reach. We also cover Fortune Green (1 mile west), Hampstead (1 mile east), Greenhill (1 mile east), Childs Hill (1 mile north-west) and Vale of Health (1 mile north-east). Larger places within reach include London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles east).
Around West Hampstead
We work in homes and buildings around South Hampstead High School, Holly Bush pub and Kilburn Grange Park. There’s a railway station in West Hampstead itself: Finchley Road & Frognal station. Well-known places in the area include Isokon Gallery (1.2 miles east) and New End Hospital (0.5 miles north-east). The countryside around West Hampstead includes Parliament Hill and Westbere Copse.
For landlords and managing agents
Landlords, agents and building managers in West Hampstead and across Greater London can book any of our surveys. To discuss a property or a block, call 07833 053749 or drop us an email.
Landlords and letting agents in West Hampstead book surveys as well as householders. The report gives you a dated record of the flat roof membrane, with photos, which helps you plan work between tenancies.