Greater London · London and the South East
Electronic leak detection in St John's Wood, Greater London
Electronic leak detection in St John's Wood and the rest of Greater London. Surveys run on weekdays and at weekends.
- Breaches hidden under paving or planting
- A flat roof leak that cannot be traced
- Repairs that haven’t stopped the leak
How it works
Once we’ve finished looking, we write up our findings as a written report with photos. As for time on site, it usually takes as long as needed for the size of the roof and how it’s built, and we’ll give you a guide when quoting. Many London properties are flats or terraces with no side access, so rear slopes are viewed from windows, the loft or, where a flight is allowed, by drone. If the building has a managing agent or access rules, tell us when booking.
- You tell us 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.
- A report with photos shows where each breach is.
Getting ready for the survey
- Make a note of anything you’d like us to look at
- Agree roof access with the managing agent if it’s shared
- Move anything stored under the loft hatch
Booking a survey
Surveys can be booked for weekdays, Saturdays or Sundays. To arrange a day that suits you, call 07833 053749 or use the contact form.
Advice
Electronic leak detection in St John's Wood
Our ELD testing covers flat roofs in St John's Wood and the rest of London and South East England. Testing usually takes more time on a big 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 are worried about a flat roof leak that can’t be traced and leaks at pipes, outlets or fixings, a survey will tell you what’s going on, whatever the roof.
On a London roof terrace or a flat roof over a back addition, water frequently 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 St John's Wood, the roof above may belong to the building rather than one flat.
It is not only a list of defects. For each finding, it explains what it is, why it matters and what we’d recommend, so you can decide what to do next.
- Location
- St John's Wood (NW8, NW6, NW3)
- Wider area
- Greater London
- Cost
- Quoted for your roof
- Reports
- Written, with photos, emailed to you
- When we survey
- Monday to Sunday, daytime
- Insured
- PI and public liability insurance
- Telephone
- 07833 053749
- Last updated
- 27 October 2026
Rented homes, blocks and businesses
If the property is let, the agent or a tenant can let us in, at a time agreed ahead of time. We survey on any day of the week, which can make access easier.
For a freeholder or residents’ company, a roof report is a sound basis for a maintenance plan, with the most urgent items set out first.
Electronic leak detection around St John's Wood
Historic houses such as Winfield House, about 0.6 miles south-east, show how far back building in the area around St John's Wood goes. If you own one of the older houses, expect a mix of original materials and later repairs on the roof, and a listed home or one in a conservation area may need consent for changes of material. Within a mile and a half or so of St John's Wood there are several hotels, and hotels, like offices and blocks of flats, often have flat roofs. For hotels and other commercial buildings, finding the cause of a flat roof leak quickly keeps rooms in use.
Anyone responsible for a site like George Eliot Primary School will know that a large flat roof with lots of outlets and rooflights has many places where a membrane can fail. If you live in an older home near Church of All Souls, the flat roofs on later extensions tend to wear out long before the main roof.
St John's Wood is about 1 mile south of Hampstead, in Greater London. If you’re in St John's Wood, booking works exactly as it does anywhere else: get in touch, agree the price and pick a day. We cover towns and villages across Greater London.
Surveys in NW8, NW6 and NW3 work the same way as everywhere else we cover. Whether your property is on The Lane, Hall Road and Hill Road or a nearby road, we can help. St John's Wood is on the A5205, so it’s easy for us to get to. Neighbouring places we cover for electronic leak detection include South Hampstead (1 mile north), Swiss Cottage (1 mile north), Primrose Hill (1 mile north-east), Lisson Grove (1 mile south) and Haverstock (1 mile north-east). We also work in nearby towns like London (4 miles south-east), Kensington (3 miles south-west), St Pancras (3 miles east), Shoreditch (4 miles east), Walthamstow (7 miles north-east) and Hoxton (4 miles east).
Landmarks near St John's Wood
Locally, jobs take us to homes and businesses close to Cecil Sharp House, Primrose Hill and Arnold House School and the streets around them. Other local landmarks include Quintin Kynaston Community Academy (under half a mile north-west) and Cafe Med pub (under half a mile north-west). St John's Wood has its own railway station: South Hampstead station. Well-known places in the area include Hospital of St John and St Elizabeth (less than half a mile south) and Montfichet's Tower (3.5 miles south-east). Not far away are The Long Water and Primrose Hill.
What a survey costs
Every roof is different, so prices are confirmed before you book. This is what makes a difference:
- If the survey needs thermal imaging or a drone
- How complicated the roof is, with its valleys, chimneys and parapets
- Building height and the viewpoints available
- Extensions, dormers and garages with roofs of their own
Every price we give includes VAT. We quote electronic leak detection for each roof, as the method and time depend on the roof. We confirm the price for your roof before booking.
Booking your survey
Here’s what helps us most when you get in touch:
- Any stains, drips or damp patches you’ve seen indoors
- When you need the report by
- Your postcode, so we can check access and travel
- Pictures from the garden or a window, if you have them
Buyers should book once an offer has been accepted, so there is time to use the report before exchange. For any other survey, just ring 07833 053749 or send us an email when you’re ready.
Why it’s worth a survey now in St John's Wood
Repeated call-outs for the same leak add up. A clear record of where the breaches are helps break that cycle. Blocked gutters and hoppers on London houses overflow and soak brickwork, which can lead to damp inside. A blocked outlet ignored for a winter or two can mean damp walls inside.
What a survey costs comes down to the roof itself: how big it is, how high it is, the number of separate roofs and how it can be reached and seen safely. Electronic leak detection is quoted for your roof, because the method depends on the roof.
Why book with us
- Professional indemnity and public liability insurance
- 98% customer satisfaction
- Weekday and weekend surveys
- Plain-English reports with photos
Take a look at what a roof survey costs and two real surveys.
What electronic leak detection doesn’t cover
Some things cannot be seen without opening up the roof, so a survey has limits:
- Build-ups without a suitable layer below
- Areas we can’t reach or that can’t be tested
- Leaks from walls, copings or rooflights
If in doubt, ring 07833 053749 or drop us an email and we will point you to the right survey. The full list of what we check.
What we look at
- Commercial flat roofs
- Roof terraces and balconies
- Single-ply roofs
- Green roofs
- Flat roof membranes
- Liquid-applied waterproofing
Places near St John's Wood
More services for St John's Wood
Questions from St John's Wood
Can you look at the flat roof of a hotel or office near St John's Wood?
Yes, commercial flat roofs are part of what we cover. Larger commercial roofs are quoted for the building.
Can parking be tricky for a visit in St John's Wood?
Sometimes, yes. Where there are permit zones, a visitor permit or nearby pay-and-display bay works well, and a driveway is even better.
Will you check the loft?
If it’s needed and safe to reach, yes. We look for staining, damp, daylight and signs of movement, as far as the space allows.
Does the report include photos?
Yes, plenty. Each finding is shown in a picture where possible, so you can see what we mean.
How long does electronic leak detection take?
It usually takes as long as needed for the membrane area and the build-up, which we set out in the quote.
How does ELD work?
The waterproofing membrane normally stops an electrical current, but a hole lets it through. That’s how we locate breaches you can’t see.
How is ELD priced?
We quote electronic leak detection for each roof, as the method and time depend on the roof. Size, build-up and access all affect the price. To get a quote, call 07833 053749 or drop us an email.
Signs you need electronic leak detection in St John's Wood
A breach can be left during installation. Testing before the roof is covered or handed over helps find them.
Signs worth acting on include:
- Failed seams and laps
- New membranes needing a check before handover
- Breaches hidden under paving or planting
- Stains far from any visible defect
Landlords with a home close to South Hampstead station may find that a flat roof over a rented flat is easy to forget until the tenant reports a leak.
What to check before booking
- What experience they bring
- What exactly goes into their report
- Is VAT included in the price?
- Which limits apply to the survey