Greater London · London and the South East
Electronic leak detection in Netherne on-the-Hill, Greater London
Need electronic leak detection in Netherne on-the-Hill? We can help, with findings in writing and pictures to back them up. Book a weekday or weekend visit.
- Leaks showing away from the breach
- Leaks through a flat roof with no obvious cause
- Leaks under green or ballasted roofs
About our electronic leak detection in Netherne on-the-Hill
Water can travel under a flat roof membrane before it shows inside. So the stain inside rarely sits under the hole. ELD tests the waterproofing directly and locates the breach. It’s testing only and leave the repair to your roofer. On suitable roofs, it replaces guesswork with a located breach. We then send you the results in a written report. If you’ve noticed punctures from foot traffic or tools and leaking laps in the waterproofing, we can find out what’s behind it, on liquid-applied waterproofing, single-ply roofs and roof terraces and balconies alike.
Water getting through a flat roof in London can travel under the covering and appear some way from the hole. Outlets, upstands against parapet walls and joins with the main roof are frequent culprits. In a converted house in Netherne on-the-Hill, the roof above may belong to the building rather than one flat.
What you get is a clear record of the flat roof membrane on the day we saw it. That makes it useful now and a handy reference later, such as when you want to compare after future work.
- Place
- Netherne on-the-Hill (CR5)
- Region
- Greater London
- Cost
- Quoted for your roof
- Reports
- Written, with photos, emailed to you
- Appointments
- Monday to Sunday, daytime
- Cover
- PI and public liability insurance
- Call
- 07833 053749
- Page updated
- 27 October 2026
Different roofs, different checks
Inverted and paved roofs
Paving and terraces cover the membrane. Suitability depends on the layers.
Green and ballasted roofs
Some layers may need lifting for testing. We discuss this before quoting.
What we do, step by step
Time on site depends on the size and shape of the roof, but as a rough guide the survey takes more time on a big roof than a small one, with the construction of the roof playing a part too. You’re welcome to ask questions while we’re there. 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, let us know when booking.
- You tell us about the roof and where water is showing.
- The roof is assessed for suitability first.
- 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.
Getting ready for the survey
- Have any paperwork from past roof work to hand
- Check we can get to the back of the property
- For a flat or shared roof, check access with whoever owns or manages the building
How to book
To get a price for electronic leak detection in Netherne on-the-Hill, phone 07833 053749 or email us. Some details about the property and the roof help us price the survey accurately.
Advice
Your questions about electronic leak detection in Netherne on-the-Hill
Is parking a problem for a survey in Netherne on-the-Hill?
It rarely stops a survey, but it is worth planning. Let us know what parking is available nearby, and the visit is planned around it.
Do you cover Netherne on-the-Hill?
We do. The survey and report are the same in Netherne on-the-Hill as anywhere else, and visits run on weekdays and weekends.
Does electronic leak detection work on all membranes?
It depends on the membrane and the build-up. Let us know what you know about the roof and we will confirm suitability.
Can you survey a shared roof?
Yes, as long as access is agreed. The roof of a block or converted house is often shared, so whoever owns or manages the building needs to agree access. We can only inspect what we are given access to.
Will I get photos?
Yes. Photos are taken throughout the survey, and the report uses them to show each finding alongside our recommendations.
Which days do you carry out surveys?
Surveys can be booked for any day of the week: weekdays, Saturdays and Sundays. Just let us know the days that suit you.
Can you give me structural calculations?
No. Our survey is not a structural engineer’s report, and it does not include calculations. We will recommend an engineer if we see signs that call for one.
Tips that help
Some practical points come up on survey after survey. They’re worth knowing whatever the roof:
- Limit access to the roof
- Use boards when working on the roof
- Avoid repeated repairs without finding the cause
- Test new membranes before covering them
Questions about the results are welcome. We will explain what was found and what it means.
Limit foot traffic on flat roofs. Feet and dropped tools are a common cause of holes.
What else we do in Netherne on-the-Hill
What this survey cannot tell you
It helps to know what a survey will not do before you book:
- Leaks from plumbing or windows
- Fixing the holes we find
- Moisture spread under the membrane
If you’re not sure which survey you need, ring 07833 053749 or drop us an email and we’ll give you a straight answer. What our survey covers.
What this survey covers
- Roof terraces and balconies
- Green roofs
- Flat roof membranes
- Liquid-applied waterproofing
- Single-ply roofs
- Commercial flat roofs
What a survey costs
A few things affect what a survey costs:
- Roof area
- House, block, shop or office
- Any need for thermal images or a drone flight
- The number of roofs, including extensions and garages
The cost of a survey depends on the roof: how big it is, how high it is, the number of separate roofs 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.
What to let us know when you contact us
A few details help us suggest the right survey and price. When you get in touch, it’s useful to mention:
- What’s prompted the survey
- Whether there is a loft hatch, a shared roof or tricky access
- What kind of property and roof it is
- Any photos you have, taken from ground level or a window
To arrange a survey, call 07833 053749 or use the contact form with the address and what you’d like to know about the roof. You’ll know the price before anything is booked.
What you can safely check yourself
After strong wind, take a look from the pavement or garden: pieces of tile or slate on the ground, a gap in the ridge or a lifted flashing are all worth noting. Leave anything above ground level to a survey.
After heavy rain, check ceilings and the tops of walls for new stains. Take a photo and write down when you saw it, which helps when we look at the roof.
Local flat roofs in Netherne on-the-Hill
Alongside Victorian and Edwardian terraces, outer London has a great many interwar semis, frequently with hipped roofs of clay or concrete tiles. On a semi of that age, the small roofs over the bays, the hip tiles and any later dormer each need their own look. Mixed in with those pitched roofs are lots of flat ones, over rear extensions, dormers, garages and shops. What can be done to an older roof may depend on listing or a conservation area. The council is the place to check, along with Historic England’s list, ideally before any re-roofing is planned.
For businesses in and around places like The Belfry, flat roofs over shops and units are easy to forget until water comes through a ceiling. The streets around a church like Church of St Margaret are frequently among the oldest in a place, and if yours is one of the older homes nearby, the flat roofs on later extensions tend to wear out long before the main roof. Anyone responsible for a site like Coulsdon Sixth Form College will know that ponding and blocked outlets on a wide flat roof are worth catching before the next wet season.
Netherne on-the-Hill is about 2 miles south of Coulsdon, in Greater London. Surveys in Netherne on-the-Hill work the same way as everywhere we cover: a careful inspection, photos and a written report. We cover towns and villages across Greater London, large and small. You can also see our page for Crawley.
Surveys in CR5 are booked the same way as anywhere else. That includes homes and businesses on The Village Square, Rookery Mead and Netherne Lane. If you are just outside Netherne on-the-Hill, we cover Hooley (1 mile west), Merstham (2 miles south), Chaldon (2 miles south-east), South Merstham (2 miles south) and Gatton (2 miles south-west). We also work in nearby towns such as London (14 miles north), City of Westminster (15 miles north), Kensington (15 miles north), Brompton (14 miles north), Stockwell (12 miles north) and Orpington (12 miles north-east).
What’s near Netherne on-the-Hill
Typical jobs here are in homes near Shabden Park and the streets around them. For rail, the closest station is Coulsdon South station, about 1.6 miles north. Nearby you’ll also find The Belfry (3.8 miles south) and East Surrey Museum (2.9 miles east). Green spaces nearby include South London Downs National Nature Reserve and Colley Hill.