Greater London · London and the South East
Electronic leak detection in Greenhill, Greater London
Electronic leak detection to pinpoint holes in flat roof membranes around Greenhill, with a written report you can act on. Book a weekday or weekend visit.
- Repairs that haven’t stopped the leak
- Gaps at membrane joints
- Leaks through a covered membrane
What a survey costs
What a survey costs depends on the time and equipment it needs. That comes down to:
- The size of the roof
- Height and safe access
- The use of thermal imaging or a drone
- The number of roofs, including extensions and garages
Bigger, taller and commercial roofs take more time to survey, so they’re priced to match. The price is confirmed before booking.
Booking your survey
These details help when you get in touch:
- Whether there’s a loft hatch, a shared roof or tricky access
- What kind of property and roof it is
- Your timetable, such as an exchange date
- Where the property is, with the postcode
A quick phone call is usually the easiest start: call 07833 053749 or email us and we will ask a few questions about the roof. The price is agreed before a date is set.
About our electronic leak detection in Greenhill
There are different ELD methods. Low-voltage testing is usually done with the surface wet, 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’ll explain our choice. If neither method suits your roof, we’ll tell you at the outset. If you are worried about leaks that return after repairs and leaks at pipes, outlets or fixings, 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 Greenhill, access is agreed with whoever manages the roof ahead of the visit. Rooflights, plant supports and pipe entries are common places for a membrane to fail.
Findings are set out part by part, from the coverings down to the gutters. You’ll see the good as well as the bad.
- Where
- Greenhill (HA1, HA3, HA2)
- Wider area
- Greater London
- Cost
- Quoted for your roof
- Your report
- Emailed report with photos and recommendations
- Appointments
- Weekdays and weekends
- Insurance
- Professional indemnity and public liability
- Telephone
- 07833 053749
- Page updated
- 27 October 2026
Also near Greenhill
Also in Greenhill
Greenhill questions
How do I find out if my home in Greenhill is listed?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. Listed building consent is needed for changes that affect a listed building’s special interest, and conservation areas can limit changes of roofing material.
Can parking be tricky for a visit in Greenhill?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
How does ELD work?
ELD passes a small electrical current across the roof to locate holes in the membrane. A breach lets the current through, which shows us where the hole is.
What if it rains on the day?
It can, depending on the survey. Drones cannot fly safely in high wind or heavy rain, and thermal imaging works best after a sunny day, with a dry roof and little wind. If the conditions aren’t right, we’ll talk to you about another date.
Can you tell me if my roof has asbestos?
No. Our report may flag materials that could contain asbestos, but only a specialist asbestos surveyor can confirm it. It may be present in buildings built or refurbished before 2000.
Do you look in the loft space?
Yes, where the survey calls for it and there is safe access. Inside, we look for damp, staining, gaps and sagging.
When does the report arrive?
The Premium Survey report comes the same day, the Standard within 24–48 hours and the Basic within 48 hours. All of them come by email, ready to forward.
Flat and commercial roofs around Greenhill
Headstone Manor, about 1.1 miles north-west, is one of the historic houses in the wider area around Greenhill. 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. In outer London, interwar semis with hipped, tiled roofs sit alongside older slate-roofed terraces. If your home in Greenhill is one of them, bay roofs, hips and later dormers each have their own details. Flat roofs on extensions, dormers, garages and business units are found alongside them almost everywhere.
If you let a flat or house near Harrow-on-the-Hill station, flat roofs over rear additions and dormers in rented property are worth checking between tenancies. Take an older house close to Church of St John the Baptist: later flat-roofed additions are common on older houses, and their edges and upstands frequently show the first signs of wear.
Greenhill is about 1 mile north-east of Harrow, in Greater London. Surveys in Greenhill work the same way as everywhere we cover: a close look at everything that’s safely in view, photographs and a clear written report. We cover towns and villages across Greater London, from the larger towns to small villages. You can also see our page for London.
Electronic leak detection in HA1, HA3 and HA2 work the same way as everywhere else we cover. Streets in the area include Lyon Road, Hill Road and Byron Road, all of which we cover. We also cover Wealdstone (1 mile north), Northwick Park (1 mile south-east), Harrow (1 mile south-west), Kenton (1 mile east) and Roxeth (1 mile south-west). Within a short drive, we also cover London (12 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles south-east), Kensington (8 miles south-east), St Pancras (10 miles south-east) and Shoreditch (12 miles east).
Local landmarks in Greenhill
Typical jobs here are in homes near Royal Oak pub, Northwick Park and Harrow High School and the streets around them. Greenhill has its own railway station: Harrow-on-the-Hill station. A little further out are St. Anns (under half a mile south-west) and Hilfield Castle (4.8 miles north). Open spaces near Greenhill include Masons Field and Northala Fields.
Landlord and commercial surveys in Greenhill
Any of our surveys can be booked by landlords, agents and building managers in Greenhill. For a price for a let property or a block, ring 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 get in touch and we’ll plan the survey around it.
How it works
We work from the outside in: outside views come first, then the loft space if there is safe access. All told, expect as long as needed for the size of the roof and how it’s built, which we set out in the quote. In Greenhill, visits are available on weekdays and at weekends. London parking is often by permit or pay-and-display, so it is useful to know what’s near you. A back bedroom window can be the best vantage point for a rear addition, so we may ask to use one.
- First, you let us know about the roof build-up and where water is showing.
- We confirm whether the roof is suitable for electronic testing.
- We pick the low-voltage or high-voltage method that suits the roof.
- The roof is tested and any breaches are located.
- You get a report showing where each breach is, for your roofer to repair.
How to prepare
- Let us know about any leaks, stains or damp patches you know of
- If the roof is shared, arrange access with whoever manages the building
- Jot down any questions you want answered
Book a survey
We confirm the price for your survey before booking, so you know the cost up front. We quote electronic leak detection for each roof, as the method and time depend on the roof. For a price for your roof, ring 07833 053749 or use the contact form.
Related advice
Useful tips for Greenhill property owners
Getting the most from electronic leak detection starts before we arrive and carries on afterwards. Some tips:
- Keep a note of leaks after rain
- Share any drawings of the roof
- Stay off the flat roof unless needed
- Avoid repeated repairs without finding the cause
File the report with your roof paperwork. It is a dated record of the membrane’s condition.
ELD before paving, ballast or planting goes on is worth considering. Finding breaches is simpler at that stage.
What you can safely check yourself
It’s useful to keep a record: dates of leaks, photos from ground level and any work done on the roof. Share it with us when you book, as it helps us focus the survey.
After strong wind, take a look from the pavement or garden: broken slates or tiles in the garden, gaps along the ridge or loose lead are signs to note. Leave anything above ground level to a survey.
What we are asked to look at in Greenhill
Repeated leaks after repairs suggest the real breach hasn’t been found. Electronic testing helps pinpoint it.
We’re frequently asked to look at:
- Leaking laps in the waterproofing
- Leaks that return after repairs
- Leaks through a covered membrane
- Holes around roof penetrations
Take a building like Saint Jerome Church of England Bilingual School: ponding and blocked outlets on a wide flat roof are worth catching before the next wet season.
Before you book anyone
- How they plan to inspect the roof safely
- Their track record with similar roofs
- Will the report include photos?
- Will they check the loft as well as the outside?