Greater London · London and the South East
Electronic leak detection in St Helier, Greater London
We carry out electronic leak detection in St Helier and the rest of Greater London. Surveys run on any day of the week.
- Failed seams and laps
- Leaks at pipes, outlets or fixings
- Leaks under green or ballasted roofs
Prices for electronic leak detection in St Helier
Prices vary from roof to roof, and it comes down to:
- Height and safe access
- Chimneys, valleys, parapets and other details
- The use of thermal imaging or a drone
- The roof’s overall size
The cost of a survey depends on the roof: its size, its height, how many sections it has and how it can be reached and seen safely. We quote electronic leak detection for each roof, as the method and time depend on the roof.
Booking your survey
When you call or email, these details help:
- The address and postcode of the property
- What made you get in touch
- What kind of property and roof it is
- Where any leaks, stains or damp patches show inside
To book a survey, ring 07833 053749 or send us an email and let us know the address and what’s prompted the survey. You’ll know the price before anything is booked.
How electronic leak detection works in St Helier
Not every flat roof suits electronic testing. Some membranes conduct electricity themselves and some roofs do not have a suitable layer beneath the membrane. If your roof isn’t suitable, we will tell you before any testing. Any details you have about the membrane and build-up help us decide, such as drawings or specifications. It saves a wasted visit. Common reasons to book are new membranes needing a check before handover and leaks at pipes, outlets or fixings, on roof terraces and balconies, commercial flat roofs and flat roof membranes.
Across London, flat roofs are everywhere, from back additions and dormers to roof terraces, blocks of flats and offices. They’re covered in felt, asphalt, EPDM rubber, GRP fibreglass or single-ply membranes, each with its own weak points. Which one is on a roof in St Helier shapes how it’s checked. Older flat roofs are often felt or asphalt, newer ones rubber or GRP.
The report works through the roof section by section, from the coverings down to the gutters, with a note and a photo for each point. You will see the good as well as the bad.
- Location
- St Helier (SM5, SM4, SM1)
- Region
- Greater London
- Prices
- Quoted for your roof
- Reports
- Emailed report with photos and recommendations
- When we survey
- Weekdays and weekends
- Insurance
- Professional indemnity and public liability
- Call
- 07833 053749
- Last updated
- 27 October 2026
The survey, step by step
We work from the outside in: first the slopes, edges and gutters from every safe viewpoint, then the loft space where it can be reached. All told, expect as long as needed for the roof’s area and construction, which we set out in the quote. In converted houses and mansion blocks, the loft hatch is often on a shared landing. If that applies to your building, it helps to agree access with the neighbours or the managing agent first. Otherwise, the visit in St Helier runs like any other.
- We ask about the roof, its age, its membrane and where leaks appear inside.
- We confirm whether the roof is suitable for electronic testing.
- We pick the low-voltage or high-voltage method that suits the roof.
- We test the membrane and find where current is passing through it.
- The breaches are recorded with photos in a report for your roofer.
Before we arrive
- Have any paperwork from past roof work to hand
- Buyers: confirm access with the estate agent or seller
- Agree roof access with the managing agent if it’s shared
Getting a price
To get a price for electronic leak detection in St Helier, call 07833 053749 or drop us an email. A few details about the property and the roof help us price the survey accurately.
Related advice
Common roof problems in St Helier
Water travels under flat roof membranes. The stain inside can be far from the hole, so tracing it by eye is difficult.
A survey makes sense if you’ve noticed:
- Leaks through a flat roof with no obvious cause
- Leaks at pipes, outlets or fixings
- Damage from equipment installers
- Patched roofs that still leak
For landlords with property near Sutton Common station, flat roofs over rear additions and dormers in rented property are worth checking between tenancies.
Questions to ask before you book
- When you’ll get the report
- Whether any drone flown is registered with the CAA
- What the survey will not cover
- Whether you can ask questions once you have the report
Rented homes, blocks and businesses
Landlords, agents and building managers in St Helier 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.
Shared roofs need a little more planning: access has to be agreed with whoever owns or manages the building. Mention it when you contact us and we will plan the visit with that in mind.
St Helier questions
Will parking be an issue for a roof survey in St Helier?
It can be, so it is useful to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Do you cover St Helier?
Yes, St Helier is one of the places we work. The survey and report are the same in St Helier as anywhere else.
How experienced are you?
Over 20 years and more than 5,000 surveys.
Is it the same as a RICS Level 2 or Level 3 survey?
No. Our survey is a roof survey, not a RICS Level 2 or Level 3 survey of the whole building. It focuses on the roof and can sit alongside a RICS survey.
Can you find leaks on a covered flat roof?
It can be possible, depending on the roof. Covered roofs limit the methods we can use, so we check the build-up first.
Do you climb onto every roof?
Not always. Safety comes first, and fragile or steep roofs cannot always be walked on. Safe viewpoints, the loft and a drone where it applies let us see the rest.
Is the repair part of the test?
No, the test finds the breaches and your roofer repairs them. Your roofer uses the report to target the repair.
What this survey can’t tell you
A survey is a proper look at the flat roof membrane, but it cannot do everything. The main limits are:
- Roofs whose membrane or build-up isn’t suitable
- Repairing the breaches (that’s for your roofer)
- Leaks from plumbing or windows
If you are not sure which survey you need, ring 07833 053749 or send us an email and we’ll give you a straight answer before booking. What a survey covers and doesn’t.
Roof types and parts we check
- Roof terraces and balconies
- Commercial flat roofs
- Green roofs
- Flat roof membranes
- Single-ply roofs
- Liquid-applied waterproofing
Local flat roofs in St Helier
Outer London has plenty of Victorian and Edwardian terraces with slate roofs, but also a great many interwar semis, frequently with hipped roofs in clay or concrete tiles. If your home in St Helier is one of them, bay roofs, hips and later dormers each have their own details. Mixed in with those pitched roofs are lots of flat ones, over rear extensions, dormers, garages and shops. The wider area around St Helier has a long history of building, with Nonsuch Mansion about 2.6 miles south-west. On older houses around here, roofs frequently carry the marks of earlier repairs, from replaced slates to new lead, and a listed home or one in a conservation area may need consent for changes of material.
Shop and office owners around Centrale Croydon may find that the flat roofs over shops and commercial units are worth checking before a leak, not after. If yours is one of the older homes in the streets near St Peter's Church, any flat roof added at the back or on a dormer is likely to be far younger, and less durable, than the main roof.
St Helier is about 3 miles south-east of Wimbledon, in Greater London. We provide electronic leak detection for homeowners, landlords and businesses in St Helier. We cover towns and villages across Greater London, from the larger towns to small villages. Our London page covers surveys nearby.
All of SM5, SM4 and SM1 is within our area for electronic leak detection, from the main roads to the quietest streets. Streets in the area include Kelso Road, Wrythe Lane and Whitby Road. Close by, we survey roofs in Rosehill (1 mile north-east), Benhilton (1 mile south-west), The Wrythe (1 mile south-east), Carshalton (1 mile south-east) and Sutton (1 mile south). Larger places within reach include London (9 miles north-east), City of Westminster (9 miles north), Marylebone (9 miles north), Kensington (8 miles north), St Pancras (10 miles north) and Shoreditch (11 miles north-east).
What’s near St Helier
Around St Helier, our work takes us to homes and buildings near Greenshaw High School, The Cricketers Inn and Merton College, among other places. For rail, the closest station is Sutton Common station, about 0.8 miles south-west. Other landmarks nearby include St Helier Hospital (under half a mile south) and Chessington Castle Hill (5 miles west). The countryside around St Helier includes Bennett's Hole and Duppas Hill.
Roof by roof
Green and ballasted roofs
Green roofs and ballasted roofs cover the waterproofing. Some methods can work through these layers but it depends on the layers.
Liquid-applied waterproofing
What lies under a liquid coating decides if ELD will work.