Greater London · London and the South East
Finchley Electronic Leak Detection
Electronic leak detection to pinpoint holes in flat roof membranes across Finchley, using drones and thermal imaging where applicable. Get in touch for a price.
- Leaks at pipes, outlets or fixings
- Damage from equipment installers
- Leaks that return after repairs
How electronic leak detection works in Finchley
Our ELD testing covers flat roofs in Finchley and the rest of London and South East England. Testing normally takes longer on a large roof than a small one, with the construction of the roof playing a part too. Every roof is quoted on its size and build-up. The results come in a written report with photos. We survey flat roof membranes, liquid-applied waterproofing and roof terraces and balconies, and common reasons people get in touch are repairs that haven’t stopped the leak and gaps at membrane joints.
Commercial and residential blocks across London frequently 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 Finchley, 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.
Most points in the report come with a picture, because a photo of a cracked flashing says more than a paragraph. Anything out of sight on the day is listed as such.
- Location
- Finchley (N3, N2, N12, NW11)
- Wider area
- Greater London
- Cost
- Quoted for your roof
- Reports
- Emailed report with photos and recommendations
- When we survey
- Monday to Sunday, daytime
- Cover
- Professional indemnity and public liability
- Telephone
- 07833 053749
- Last updated
- 27 October 2026
Your questions about electronic leak detection in Finchley
How do I find out if my home in Finchley is listed?
We can’t confirm that for you, but Historic England’s list and your council can. A change of roofing material may need consent in either case.
Can parking be tricky for a visit in Finchley?
Parking in Finchley, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you test for asbestos?
No. We can flag materials that might contain asbestos, but confirming it is a job for a specialist asbestos surveyor. Buildings built or refurbished before 2000 may contain it.
Will you go up on the roof?
Only when it is safe. Safety comes first, and fragile or steep roofs can’t always be walked on. We use safe viewpoints, the loft space and a drone where it applies, and the report records anything we couldn’t see.
Will you repair the leak?
No, our part is finding the breaches. Your roofer uses the report to target the repair.
Do I need to be at home?
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.
Can you give me structural calculations?
No. We note visible signs such as sagging or deflection, but we’re not structural engineers and don’t carry out calculations. If we think you need an engineer, the report says so.
Also near Finchley
What else we do in Finchley
What this survey can’t tell you
Before booking, it is worth knowing what a survey won’t do:
- Areas we cannot reach or that cannot be tested
- Moisture spread under the membrane
- Fixing the holes we find
If you’re not sure which survey you need, phone 07833 053749 or use the contact form and we will give you a straight answer before booking. What our survey covers.
What this survey covers
- Flat roof membranes
- Liquid-applied waterproofing
- Roof terraces and balconies
- Single-ply roofs
- Commercial flat roofs
- Green roofs
Rented homes, blocks and businesses
Letting agents can arrange access with tenants. We survey on weekdays and at weekends, which can make access easier.
Freeholders and residents’ companies use a roof report to plan and budget, putting the urgent items at the top.
Why get it checked now?
Cutting open a flat roof to find a leak can cause more damage. ELD aims to locate the breach first so your roofer knows where to work. London’s older roofs often have bitumen felt underlay or none at all, so a slipped slate can soon mean water inside. Left alone, that means wet timbers and plaster, which is a far bigger job than the roof fault itself.
To find out what your survey will cost, call 07833 053749 or send us an email with the address and a few details. The price is agreed before a date is set.
Why book us in Finchley
- Thermal imaging and drones used where they help
- Over 5,000 surveys carried out
- 20+ years’ experience
- Professional indemnity and public liability insurance
The survey, step by step
The aim of the visit is simple: to see as much of the flat roof membrane as can be seen safely and record it clearly. Notes and photographs go into the written report. The visit usually takes a length of time set by the membrane area and the build-up, and we’ll give you a guide when quoting. London terraces rarely offer a view of the whole roof from one spot, so in Finchley we work round the house, using the street, the windows, the loft and any safe vantage point behind it. If other people live in the building, tell us who can let us into the shared parts.
- We start by finding out what the roof is made of and where it leaks.
- We confirm whether the roof is suitable for electronic testing.
- The method depends on the membrane and what sits above and below it.
- The roof is tested and any breaches are located.
- The breaches are recorded with photos in a report for your roofer.
Preparing for the visit
- For a flat or shared roof, check access with the freeholder or managing agent
- Unlock side gates and any roof access doors
- Buyers: confirm access with the estate agent or seller
How to book
Most bookings start with a short call: ring 07833 053749 or send us an email and we’ll ask a few questions about the roof. You will have a price before anything is arranged.
Related advice
What a survey costs
Not every roof costs the same to survey, for these reasons:
- Commercial roofs and larger buildings
- The height of the building and how the roof can be seen safely
- The roof’s overall size
- Extensions, dormers and garages with roofs of their own
The cost of a survey depends on the roof: its size, its height, how many sections it has and how safely it can be seen. We quote electronic leak detection for each roof, as the method and time depend on the roof.
Getting in touch
A little information up front helps. Please include:
- Pictures from the garden or a window, if you have them
- Where the property is, with the postcode
- Anything about access we should know
- What made you get in touch
To arrange a survey, ring 07833 053749 or use the contact form and let us know the address and what’s prompted the survey. We’ll confirm the price before you book.
What electronic leak detection looks like in Finchley
Alongside Victorian and Edwardian terraces, outer London has a great many interwar semis, often with hipped roofs of clay or concrete tiles. If your home in Finchley is one of them, bay roofs, hips and later dormers each have their own details. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere. Heath Hall, about 1.8 miles south, is one of the historic houses in the wider area around Finchley. If your house is among the older ones, expect a mix of original materials and later repairs on the roof, and any change of roofing material on a listed home needs checking with the council first.
Shop and office owners around Grand Arcade may find that a flat roof over a business is out of sight and out of mind until it leaks. For site and facilities teams at buildings like Manorside Primary School, schools and public buildings often have big flat roofs, and their outlets and upstands need regular checks. For landlords with property near New Southgate station, a flat roof over a rented flat is easy to forget until the tenant reports a leak.
Finchley is about 6 miles north of City of Westminster, in Greater London. Surveys in Finchley work the same way as everywhere we cover: a careful inspection, photos and a written report. We cover towns and villages across Greater London, from the larger towns to small villages. Our London page covers surveys nearby.
Electronic leak detection in N3, N2, N12 and NW11 work the same way as everywhere else we cover. Whether your property is on Station Road, Chaplin Square and Market Place or anywhere close by, we can help. Finchley sits on or near the B1462, so getting to you is simple. If you’re just outside Finchley, we cover Church End (1 mile west), Woodside Park (1 mile north), North Finchley (1 mile north), Friern Barnet (2 miles north-east) and Oakleigh Park (2 miles north). Within a short drive, we also cover London (8 miles south-east), City of Westminster (6 miles south), Marylebone (6 miles south), Kensington (7 miles south), St Pancras (6 miles south-east) and Shoreditch (7 miles south-east).
Around Finchley
Typical jobs here are in homes near The Elephant Inn, Bishop Douglass School and Francis Skaryna Belarusian Library and Museum. Other local landmarks include Victoria Park (under half a mile north) and Woodhouse College (1 mile north-east). The nearest railway station is New Southgate station, about 1.9 miles north-east of the centre. Other landmarks nearby include Finchley Memorial Hospital (under half a mile north-east) and Grand Arcade (1 mile north). Not far away are Highgate Hill and Lakeside Nature Reserve.
Tips that help
You do not need to be a roofer to help. What helps most:
- Note where leaks show inside and when
- Avoid repeated repairs without finding the cause
- Share any drawings of the roof
- Stay off the flat roof unless needed
If water has been getting in, insulation under the membrane may be wet. Your roofer can advise on that, and moisture readings can help.
Limit foot traffic on flat roofs. Feet and dropped tools are a common cause of holes.