Greater London · London and the South East
Electronic Leak Detection in St Johns
Electronic leak detection to pinpoint holes in flat roof membranes across St Johns, with drones and thermal imaging where they help. Get in touch for a price.
- Holes left by work on the roof
- Leaks that return after repairs
- Leaks through a covered membrane
Electronic leak detection for homes and businesses in St Johns
ELD finds breaches in the membrane but not every way water gets in. Water coming through walls, copings, rooflights or plumbing will not show on the test. We will tell you if we think the leak is coming from somewhere else. It will not show water getting in through brickwork or around frames. The report makes clear what was and wasn’t tested. You will also know what to check next. If you’ve noticed breaches hidden under paving or planting and gaps at membrane joints, we can find out what’s behind it.
Commercial and residential blocks across London often have big flat roofs with plant, rooflights and access walkways. Every penetration and upstand is a place where a membrane can fail. For a building in St Johns, access is agreed with whoever manages the roof before the visit. Rooflights, plant supports and pipe entries are common places for a membrane to fail.
Most points in the report come with a picture, because a photo of a cracked flashing says more than a paragraph. If something couldn’t be seen safely, the report is clear about it.
- Where
- St Johns (SE13, SE10, SE8)
- Region
- Greater London
- Price
- Quoted for your roof
- Reports
- A written report with photos, by email
- Survey days
- Weekdays and weekends
- Insurance
- PI and public liability insurance
- Telephone
- 07833 053749
- Last updated
- 27 October 2026
Tips that help
There is plenty you can do without going near the roof. What helps most:
- Find the breach before more patching
- Stay off the flat roof unless needed
- Note where leaks show inside and when
- Let us know about the membrane and build-up if you know it
Where the evidence points to walls, copings or rooflights, we will note it, so other causes can be checked.
Keep people off the flat roof unless they need to be there. Many breaches come from foot traffic.
St Johns questions
Will parking be an issue for a roof survey in St Johns?
Sometimes, yes. If St Johns has controlled parking where you are, a visitor permit is the easiest answer, and a driveway is even better.
Do you look at commercial flat roofs near St Johns, such as hotels?
Yes, commercial buildings, hotels included, are part of the work. Roof access is agreed with the building manager or owner beforehand.
Which days do you carry out surveys?
Surveys run on any day of the week. To find a day that suits you, call 07833 053749 or send us an email.
Will you repair the leak?
No. ELD is testing only. You get the breach locations with photos so your roofer can fix them.
Can you survey in bad weather?
A survey can usually go ahead in light rain, 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 we will agree a new date if the weather is not suitable.
Do you use drones?
Yes, where it is applicable. Our sub-250g drone is flown by a CAA-registered operator with a Flyer ID and Operator ID, and every flight depends on the airspace and the weather.
How much does electronic leak detection cost?
We quote for each roof individually. Send us details of the roof, and ring 07833 053749 or drop us an email for a quote.
Surveys for landlords and agents in St Johns
If you own several properties, surveys can be booked for more than one address. To arrange surveys for several addresses, call 07833 053749 or email us with the addresses.
For blocks of flats, a roof survey helps managing agents and residents’ management companies plan ahead. Recommendations are set out with the most urgent first where relevant, which helps when budgeting.
Also in St Johns
How the survey changes by roof type
Green and ballasted roofs
Green roofs and ballasted roofs cover the waterproofing. Testing may still be possible, depending on the build-up.
Single-ply membranes
ELD often works on single-ply membranes, depending on the type and build-up.
How the survey works
We photograph the roof as we go, so the report shows exactly what we saw. We take close-ups from wherever is safe, including by drone where it’s applicable and the weather allows. Most surveys take as long as needed for the roof’s area and construction, which we’ll explain when we quote. In St Johns, as in much of London, plenty of properties are flats or terraces without side access, so the back of the roof is often seen from upstairs windows, from inside or, where a flight is allowed, from the air. If the building has a managing agent or access rules, tell us when you book.
- First, we confirm which roof areas are included.
- The surface is prepared for the chosen method.
- Testing runs across the agreed area.
- We mark the breach locations in our records.
- You receive the results to pass to your roofer.
Before we arrive
- Move anything stored under the loft hatch
- Check we can get to the back of the property
- Point out any leaks or damp patches
Booking a survey
Booking is simple: just ring 07833 053749 or use the contact form, tell us about the property and we’ll explain which survey suits. We confirm the price before anything is booked.
Related advice
Common roof problems in St Johns
Roofs covered with paving, ballast or planting hide the membrane. Electronic methods can help on some of these roofs, depending on the build-up.
A survey can pick up problems such as:
- A flat roof leak that can’t be traced
- Patched roofs that still leak
- New roofs to check before paving or planting
- Stains far from any visible defect
For an older house near a landmark such as Church of St John, later flat-roofed additions are common on older houses, and their edges and upstands frequently show the first signs of wear.
What to check before booking
- What the survey won’t cover
- Do they have a CAA Flyer ID and Operator ID for drone work?
- Whether the roof space is looked at, where there is one
- How they plan to inspect the roof safely
What this survey can’t tell you
Our findings are based on what we can see safely on the day, so there are some things a survey can’t cover:
- Sections we cannot safely access
- Leaks from walls, copings or rooflights
- Carrying out the repair work
If in doubt, call 07833 053749 or email us and we will suggest the right survey. What a survey covers and doesn’t.
What we look at
- Commercial flat roofs
- Liquid-applied waterproofing
- Roof terraces and balconies
- Single-ply roofs
- Flat roof membranes
- Green roofs
Electronic leak detection in St Johns: local notes
Close to the centre of London, a great many houses are Victorian or Edwardian terraces, many of them roofed in Welsh slate. 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. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere. Queen's House, about 1.1 miles north-east, is one of the historic houses in the wider area around St Johns. Older homes in the wider area frequently have features worth a closer look, such as lead valleys, tall stacks and roofs that have been patched over the years.
For hotels and guest houses around St Johns, a roof problem found early is far less disruptive than one found by a guest. For landlords with property near St Johns station, the flat roof over a let home is worth a look before it becomes a tenant complaint.
St Johns is about 4 miles south-east of London, in Greater London. Anywhere in St Johns, we can come and survey your property, on a weekday, Saturday or Sunday. Across Greater London, we cover St Johns and the places around it.
We cover every part of SE13, SE10 and SE8 for electronic leak detection and the streets around it. Whether your property is on Avon Road, Mill Lane and Clare Road or anywhere close by, we can survey it. St Johns sits on or near the A2210 and A2211. Neighbouring places we cover for electronic leak detection include New Cross (1 mile west), Deptford (1 mile north), Lewisham (1 mile south-east), Telegraph Hill (1 mile west) and Ladywell (1 mile south). We also work in nearby towns like London (4 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (8 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).
Landmarks near St Johns
Around St Johns, our work takes us to homes and buildings near Wickham Arms, Brookmill Park and Addey and Stanhope School, among other places. Other local landmarks include St. Paul's (0.7 miles north) and Laban Centre (0.8 miles north). St Johns has its own railway station: St Johns station. A little further out are Fan Museum (0.9 miles north-east) and Lewisham Shopping Centre (0.7 miles south-east). The countryside around St Johns includes Brookmill Road Local Nature Reserve and Tower Hill.