Greater London · London and the South East
Electronic Leak Detection in Cranford
Electronic leak detection to pinpoint holes in flat roof membranes in Cranford, using drones and thermal imaging where applicable. Get in touch for a price.
- New membranes needing a check before handover
- Leaks under green or ballasted roofs
- Holes left by work on the roof
Electronic leak detection in Cranford
There are different ELD methods. Low-voltage methods normally need a wet roof surface, while high-voltage testing needs a dry, exposed membrane. The right method depends on the membrane and the build-up of the roof, and we will explain our choice. If neither method suits your roof, we will tell you at the outset. If you are worried about stains far from any visible defect and leaks under green or ballasted roofs, we can find out what’s behind it, whatever the roof.
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, and each fails in its own way. In Cranford, as anywhere in London, the right approach depends on what the roof is made of. Older flat roofs are often felt or asphalt, newer ones rubber or GRP.
The report records the flat roof membrane as we found it on the day. It’s useful right away, and a good reference for later, for example when you want to check whether anything has changed.
- Place
- Cranford (TW4, TW5, UB3)
- Region
- Greater London
- Cost
- Quoted for your roof
- Reports
- Written, with photos, emailed to you
- Appointments
- Weekdays and weekends
- Cover
- PI and public liability insurance
- Call
- 07833 053749
- Updated
- 27 October 2026
What electronic leak detection looks like in Cranford
The wider area around Cranford has a long history of building, with Osterley House about 2.6 miles east. On older houses around here, roofs often carry the marks of earlier repairs, from replaced slates to new lead, and any change of roofing material on a listed home needs checking with the council first. Cranford has a number of hotels within about a mile and a half, and like offices and blocks, hotels often sit under flat roofs. If you look after one, a leak through a flat roof can put a room out of use.
If yours is one of the older homes in the streets near The Parish Church of the Good Shepherd, later flat-roofed additions are common on older houses, and their edges and upstands often show the first signs of wear. If you look after a building like Cranford Primary School, a large flat roof with lots of outlets and rooflights has many places where a membrane can fail. Landlords with a home close to Hayes & Harlington station may find that a flat roof over a rented flat is easy to forget until the tenant reports a leak.
Cranford is about 2 miles north of Feltham, in Greater London. We survey roofs in Cranford and the rest of Greater London. Our Greater London coverage includes Cranford. You can also see our page for London.
Electronic leak detection in TW4, TW5 and UB3 work the same way as everywhere else we cover. You will find streets such as Ely Road, Park Lane and The Avenue, all of which we cover. We also cover Hatton (1 mile south-west), Harlington (1 mile north-west), Heathrow (2 miles west), Feltham (2 miles south) and Sipson (2 miles north-west). Within a short drive, we also cover London (14 miles east), City of Westminster (11 miles east), Marylebone (12 miles east), Kensington (9 miles east), St Pancras (13 miles east) and Shoreditch (15 miles east).
What’s near Cranford
We work in homes and buildings around Cranford Community College, The Queen's Head pub and Hounslow Heath. The closest station to Cranford is Hayes & Harlington station, roughly 1.9 miles north. Well-known places in the area include Hounslow Hospital (1.6 miles east) and Treaty Centre (2 miles east). For a walk, there’s Garden Lake and Northala Fields.
How the survey changes by roof type
Single-ply membranes
Punctures from foot traffic and equipment are common on single-ply roofs. ELD can locate them.
Liquid-applied waterproofing
Small holes in liquid waterproofing may leak. ELD can help locate them on suitable roofs.
What affects the price in Cranford
To price your survey, we check:
- How complicated the roof is, with its valleys, chimneys and parapets
- Any need for thermal images or a drone flight
- The size of the roof
- The number of roofs, including extensions and garages
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 safely it can be seen. Electronic leak detection is quoted for your roof, because the method depends on the roof.
What to tell us when you contact us
What helps most when you contact us:
- Any marks or damp showing indoors
- The type of building and roof, such as pitched or flat
- Your timetable, such as an exchange date
- What’s prompted the survey
If you’re buying, it is useful to book soon after your offer is accepted, so you have the findings in time to act on them before you exchange. For any other survey, just call 07833 053749 or send us an email when you are ready.
Surveys for landlords and agents in Cranford
Businesses and commercial landlords can book us too, from shops and offices to industrial units. Bigger roofs take more time, and they’re priced for the size.
For a freeholder or residents’ company, a roof report is a sound basis for a maintenance plan, putting the urgent items at the top.
What happens on the day
Every visit follows the same pattern: we hear what you’ve seen, look at the roof from every safe viewpoint, take photographs as we go and record our findings for the written report. It normally takes a time that depends on the membrane area and the build-up, and we’ll give you a guide when quoting. In a London area like Cranford, the main things to sort out are parking and access: let us know about parking, the floor the property is on, any shared entrance and loft access. On the day, the roof is looked at from the ground, from windows, from inside the roof space and from the roof where it’s safe.
- We start with what you know about the roof and the leak.
- 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 the survey
- Make a note of anything you’d like us to look at
- Keep pets in another room
- Note where any stains or damp appear
Getting a price
Surveys can be booked for weekdays, Saturdays or Sundays. To find a date that works for you, ring 07833 053749 or use the contact form with the address and the days you’d prefer.
Related advice
What electronic leak detection does not cover
It’s a careful look at the flat roof membrane, not the whole story. Its limits include:
- Fixing the holes we find
- Roofs whose membrane or build-up is not suitable
- Parts of the roof covered by fixed equipment
If you are not sure which survey you need, call 07833 053749 or use the contact form and we will give you a straight answer. What a survey covers and doesn’t.
Roofs we survey in Cranford
- Roof terraces and balconies
- Single-ply roofs
- Commercial flat roofs
- Liquid-applied waterproofing
- Flat roof membranes
- Green roofs
Also in Cranford
FAQs for Cranford
Does a conservation area affect roof work in Cranford?
Check Historic England’s online list first, then ask the council about conservation areas and any Article 4 direction. The answer matters most when a change of material is on the cards.
Can you look at the flat roof of a hotel or office near Cranford?
Yes. As well as homes, we check flat roofs on offices, hotels, blocks of flats and commercial units. Larger commercial roofs are quoted for the building, and roof access is agreed with you before the visit.
Do I have to be there for the survey?
If the survey includes the loft or the inside of the building, someone needs to let us in. Access is agreed with you when you book.
How do you choose the testing method?
The method is chosen to suit the roof. Low-voltage testing typically needs a wet surface and high-voltage methods need the membrane dry and exposed.
Are you insured?
Our surveys are covered by professional indemnity and public liability insurance. Ask if you need details for a managing agent or building owner.
Is Cranford in your area?
Yes. We carry out electronic leak detection in Cranford.
Do you climb onto every roof?
Only when it’s safe. Some roofs are too steep or fragile to walk on safely. We use safe viewpoints, the loft space and a drone where it applies.
Tips that help
Most of what helps is simple and safe from ground level. Our suggestions:
- Record dates and spots where water appears
- Check new waterproofing before handover
- Share any drawings of the roof
- Ask contractors to protect the membrane
The report records each breach location with photos. Pass it to your roofer to repair the breach points.
Don’t leave a flat roof leak running. Water under a membrane can spread.