Greater London · London and the South East
Electronic leak detection in Greenhill, Greater London
Electronic leak detection in Greenhill from an independent, experienced roof surveyor. Over 5,000 surveys and 20+ years behind us across London and South East England.
- Repairs that haven’t stopped the leak
- A flat roof leak that cannot be traced
- New membranes needing a check before handover
Do you need electronic leak detection in Greenhill?
Work on the roof can damage a membrane. Engineers fitting equipment, solar panels or aerials may leave damage behind.
Most people get in touch when they’ve noticed one of these:
- Gaps at membrane joints
- Leaks showing away from the breach
- Leaks through a flat roof with no obvious cause
- Breaches hidden under paving or planting
If your house is among the older ones in the streets near Rosslyn Hill Unitarian Chapel, flat-roofed rear additions and dormers added over the years are worth checking.
Before you book any roof surveyor
- Do they have a CAA Flyer ID and Operator ID for drone work?
- Is there a chance to talk the report through?
- What insurance they carry
- What experience they bring
Electronic leak detection for homes and businesses in Greenhill
ELD can be carried out in more than one way. Low-voltage methods typically need a wet roof surface, while high-voltage testing needs a dry, exposed membrane. Which one suits depends on the membrane and the layers of the roof and we explain which we’ll use. If neither method suits your roof, we’ll tell you before any testing starts. We are often asked to look into new roofs to check before paving or planting and leaks that return after repairs, on liquid-applied waterproofing, roof terraces and balconies and flat roof membranes.
On a London roof terrace or a flat roof over a back addition, water often runs under the covering before it shows. Outlets, upstands against parapet walls and joins with the main roof are frequent culprits. In a converted house in Greenhill, the roof above may belong to the building rather than one flat.
The report records the flat roof membrane as we found it on the day. That makes it useful now and a handy reference later, like when you want to compare after future work.
- Where
- Greenhill (NW3, NW6)
- Wider area
- Greater London
- Price
- Quoted for your roof
- Your report
- Emailed report with photos and recommendations
- Survey days
- Monday to Sunday, daytime
- Cover
- PI and public liability insurance
- Telephone
- 07833 053749
- Updated
- 27 October 2026
When you need someone else
This is not a RICS building survey, a structural engineer’s report or an asbestos survey. It also has these limits:
- Carrying out the repair work
- Areas we cannot reach or that can’t be tested
- Some conductive membranes
If in doubt, phone 07833 053749 or email us and we’ll suggest the right survey. What a survey covers and does not.
Roof types and parts we check
- Liquid-applied waterproofing
- Commercial flat roofs
- Roof terraces and balconies
- Green roofs
- Flat roof membranes
- Single-ply roofs
For landlords and managing agents
Buyers’ agents can book surveys on behalf of their clients. The report is emailed, so it can go straight to your client.
For blocks of flats, a roof survey helps managing agents and residents’ management companies plan ahead. The report sets out what needs attention now and what can wait.
Flat and commercial roofs around Greenhill
Welsh slate on Victorian and Edwardian terraces is a familiar sight across inner London. Many have butterfly roofs draining to a central valley gutter, with parapet walls and gutters hidden behind them. If your home in Greenhill is one of them, lead flashings, party-wall upstands and shared chimney stacks are part of the picture too. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere. Greenhill has a number of hotels within about a mile and a half, and hotels, like offices and blocks of flats, frequently have flat roofs. For hotels and other commercial buildings, finding the cause of a flat roof leak quickly keeps rooms in use.
Shop and office owners around O2 Centre may find that the flat roofs over shops and commercial units are worth checking before a leak, not after. 2 Willow Road lies about 0.3 miles north-east, so building around Greenhill goes back a long way. Older houses nearby often have flat roofs added much later, built to very different standards from the main roof.
Greenhill is about 1 mile north-east of Hampstead, in Greater London. From houses to flats and shops in Greenhill, we can survey the roof on a weekday or at the weekend. Our area takes in places right across Greater London.
We cover every part of NW3 and NW6 for electronic leak detection and the streets around it. If you need electronic leak detection at a property on Back Lane, Well Road and Ornan Road or anywhere close by, we can survey it. If you’re just outside Greenhill, we cover Hampstead (1 mile south-west), Vale of Health (1 mile north), West Hampstead (1 mile west), Fortune Green (1 mile west) and Haverstock (1 mile south-east). We also work in nearby towns like London (5 miles south-east), City of Westminster (3 miles south), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (3 miles south-east) and Shoreditch (5 miles south-east).
Near you in Greenhill
Locally, jobs take us to homes and businesses close to Cecil Sharp House, Fitzjohn's Primary School and King William IV Public House, among other places. Also close by are South Hampstead High School (0.6 miles south) and Hampstead Heath (0.7 miles north-east). Greenhill has its own railway station: Hampstead Heath station. A little further out are New End Hospital (under half a mile north-west) and Montfichet's Tower (4.3 miles south-east). Not far away are Belsize Wood and Parliament Hill.
How it works
You do not need to do much on the day. Point out anything you’ve noticed, like stains, drips or loose pieces, and we’ll take it from there. The survey itself takes as long as needed for the roof’s area and construction, which we’ll explain when we quote. In converted houses and mansion blocks, the loft hatch is often on a shared landing. If that applies to your building, it is useful to agree access with the neighbours or the managing agent first. Otherwise, the visit in Greenhill runs like any other.
- 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.
- The membrane is tested and breaches are found.
- A report with photos shows where each breach is.
Preparing for the visit
- Jot down any questions you want answered
- Keep pets out of the way during the survey
- If you are buying, let the agent know when we’re coming
Arrange a survey
Most bookings start with a short call: call 07833 053749 or use the contact form, and we will ask about the building and what you need. The price is agreed before a date is set.
Related advice
Questions from Greenhill
Is my home in Greenhill listed or in a conservation area?
You can check whether a building is listed on Historic England’s list, and your council can tell you if it’s in a conservation area. Listed building consent is needed for changes that affect a listed building’s special interest, and conservation areas can limit changes of roofing material.
Is parking a problem for a survey in Greenhill?
Normally it’s manageable with a little notice. Let us know what parking is available nearby, and the visit is planned around it.
Do you use low-voltage or high-voltage testing?
The roof decides the method. We will explain why when we quote.
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.
What do I do with the report?
The report comes by email, and what you do next is up to you: use it with a seller, an insurer, a roofer or a managing agent.
What does the report include?
It sets out what we found, why it matters and what we recommend, with photographs throughout. Anything we couldn’t see safely is noted too, so you know exactly what was covered.
Can you test a green or ballasted roof?
Sometimes. It depends on the build-up and the layers above the membrane, and some may need lifting. We will discuss it before we quote.
Checking the roof from ground level
After strong wind, take a look from the pavement or garden: broken slates or tiles in the garden, gaps along the ridge or loose lead are signs to note. Leave anything above ground level to a survey.
Fresh stains on ceilings or walls after rain are worth noting. Take a photo and write down when you saw it.
What affects the price in Greenhill
To price your survey, we look at:
- How tall the building is and how easy the roof is to see
- Features like valleys, chimneys, dormers and parapets
- Any need for thermal images or a drone flight
- House, block, shop or office
Bigger, taller and commercial roofs take more time to survey, so the price reflects that. You’ll know the figure before booking.
Helping us price your survey
These details help when you contact us:
- The kind of building and roof involved
- Any marks or damp showing indoors
- The reason for the survey, like buying, a leak or storm damage
- Pictures from the garden or a window, if you have them
Surveys can be booked for weekdays, Saturdays or Sundays. To arrange a day that suits you, ring 07833 053749 or drop us an email with the address and the days you’d prefer.