Greater London · London and the South East
Harrow on the Hill Electronic Leak Detection
An experienced roof surveyor for electronic leak detection in Harrow on the Hill. More than 20 years and over 5,000 surveys.
- New membranes needing a check before handover
- Damp inside with no sign on the roof
- Leaking laps in the waterproofing
Roof by roof
Green and ballasted roofs
Green roofs and ballasted roofs cover the waterproofing. Testing may still be possible but it depends on the layers.
Single-ply membranes
Single-ply membranes are common on commercial and newer roofs. Seams and penetrations are typical breach points.
Electronic leak detection for homes and businesses in Harrow on the Hill
Electronic leak detection works on many flat roof membranes, on homes, blocks and commercial buildings. It can be used to trace an existing leak or to test a new membrane before it is covered. We quote for each roof based on its size and build-up. We can test on weekdays and at weekends, depending on the weather. Let us know about your roof to find out more. If you’ve noticed waterproofing to test before it’s covered and repairs that haven’t stopped the leak, a survey will tell you what’s going on, whatever the roof.
Across London, flat roofs are everywhere, from back additions and dormers to roof terraces, blocks of flats 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 Harrow on the Hill, 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.
Nothing in the report is left vague: if work is needed, the report says so clearly, along with how urgent it is.
- Where
- Harrow on the Hill (HA1, HA0, HA2)
- Wider area
- Greater London
- Cost
- Quoted for your roof
- Your report
- Emailed report with photos and recommendations
- Appointments
- Monday to Sunday, daytime
- Insured
- PI and public liability insurance
- Telephone
- 07833 053749
- Last updated
- 27 October 2026
Why act early in Harrow on the Hill
Leaks left running can wet the insulation and deck. Locating it early helps limit the damage. In Harrow on the Hill, as across London, an overflowing gutter soaks the wall below. A small blockage left for a few winters becomes a damp problem.
What a survey costs comes down to the roof itself: its size, its height, how many sections it has and how safely it can be seen. Electronic leak detection is quoted for your roof, because the method depends on the roof.
Why choose Independent Roof Survey in Harrow on the Hill
- 98% customer satisfaction
- Thermal imaging and drone inspection where they help
- Visits on any day of the week
- Drone flown under a CAA Flyer ID and Operator ID
Take a look at how roof surveys are priced and what we found on two real jobs.
What we are asked to look at in Harrow on the Hill
When the membrane is buried, holes cannot be seen at all. ELD can work on some covered roofs, depending on the build-up.
Typical things we’re asked to look at include:
- Leaks at pipes, outlets or fixings
- Damp inside with no sign on the roof
- Water coming in under a flat roof
- Leaks through a covered membrane
Controlled parking zones are common in London, so mention any permit rules for Harrow on the Hill, along with any off-street space.
Questions to ask before booking
- Whether the loft is part of the inspection
- Whether VAT is in the quoted price
- Their report turnaround times
- Which viewpoints they use to see the roof
Towns and villages near Harrow on the Hill
Also in Harrow on the Hill
Flat and commercial roofs around Harrow on the Hill
In outer London, interwar semis with hipped, tiled roofs sit alongside older slate-roofed terraces. On a semi of that age, the small roofs over the bays, the hip tiles and any later dormer each need their own look. Next to the main roofs there is normally a flat roof somewhere, whether on an extension, a garage or a commercial unit. Historic houses like Northolt Manor, about 2.1 miles south-west, show how far back building in the area around Harrow on the Hill goes. On older houses around here, roofs frequently 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.
If you run a business near St. Anns, a flat roof over a business is out of sight and out of mind until it leaks. Anyone responsible for a site like St George’s Primary Catholic Voluntary Academy will know that schools and public buildings frequently have big flat roofs, and their outlets and upstands need regular checks.
Harrow on the Hill is about 1 mile south-east of Harrow, in Greater London. Wherever you are in Harrow on the Hill, we can carry out electronic leak detection at your property, on a weekday, Saturday or Sunday. Across Greater London, we cover Harrow on the Hill and the places around it. London is in our area too.
Here we cover the HA1, HA0 and HA2 postcode area for electronic leak detection. Whether your property is on New Road, Amery Road and London Road or anywhere close by, we can help. We also cover the places around Harrow on the Hill: Roxeth (1 mile west), Northwick Park (1 mile north-east), South Harrow (1 mile west), Harrow (1 mile north-west) and Sudbury (1 mile south-east). Further out, we also cover London (11 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles east), Kensington (7 miles south-east), St Pancras (10 miles east) and Shoreditch (11 miles east).
Landmarks near Harrow on the Hill
Typical jobs here are in homes near Northwick Park, St Dominic's Sixth Form College and Orley Farm School, among other places. Harrow on the Hill’s nearest station is Sudbury Hill Harrow station, roughly 0.5 miles south of the centre. Well-known places in the area include Kodak Museum (2 miles north) and Clementine Churchill Hospital (under half a mile south-east). Green spaces nearby include Middle Lake and Northala Fields.
How the survey works
The aim of the visit is simple: to look at the flat roof membrane as closely as is safe and record what we find. Notes and photos go into the written report. The visit normally takes a time that depends on the size of the roof and how it’s built, and we’ll give you a guide when quoting. In a London conversion, the way into the roof space is frequently from a communal landing or the top flat. Where that is the case, access needs agreeing with whoever controls that landing. Everything else is planned around the building, not the postcode.
- We ask about the roof, its age, its membrane and where leaks appear inside.
- The roof is assessed to see if electronic testing will work on it.
- The testing method is chosen to suit the membrane and build-up.
- Testing runs across the roof to locate breaches in the membrane.
- The breaches are recorded with photos in a report for your roofer.
Preparing for the visit
- Keep pets out of the way during the survey
- Tell us about parking before the day
- Have any paperwork from past roof work to hand
Getting a price
To arrange a survey, call 07833 053749 or drop us an email with the address and what you’d like to know about the roof. You will know the price before anything is booked.
Advice
FAQs for Harrow on the Hill
Do you cover Harrow on the Hill?
Yes, Harrow on the Hill is within the area we cover. Our area covers London and South East England. Just phone 07833 053749 or send us an email and tell us about the property.
How do I find out if my home in Harrow on the Hill is listed?
For listing, use Historic England’s list; for conservation areas, ask the council. The answer matters most when a change of material is on the cards.
Can you survey in bad weather?
A survey can normally go ahead in light rain. High wind or heavy rain can stop drone flights and make roof access unsafe, so we will agree a new date if the weather isn’t suitable.
How long does electronic leak detection take?
It depends on the size of the roof and its build-up. You’ll know roughly how long before we start.
What’s the price of ELD?
We quote electronic leak detection for each roof, as the method and time depend on the roof. Size, build-up and access all affect the price. For a quote, call 07833 053749 or drop us an email.
Will you fly a drone over my roof?
Where it helps and it is safe, yes. Flights depend on the weather on the day and airspace rules, including flight restriction zones near airports. We’re a CAA-registered drone operator.
How do I book a survey in Harrow on the Hill?
It’s easiest to call 07833 053749 or email us. Give us the address and some details about the roof, and we will point you to the right survey. We survey on weekdays, Saturdays and Sundays.
What affects the cost of electronic leak detection
Every roof is different, so prices are confirmed before booking. This is what makes a difference:
- How complicated the roof is, with its valleys, chimneys and parapets
- Roof area
- Whether it is a home or a commercial building
- How tall the building is and how easy the roof is to see
Every price we give includes VAT. We quote electronic leak detection for each roof, as the method and time depend on the roof. You will know the price for your roof before you book.
Booking your survey
Before you get in touch, it is useful to have:
- Where water is showing inside, if it is
- What’s prompted the survey
- The type of building and roof, such as pitched or flat
- Pictures from the garden or a window, if you have them
We survey roofs on any day of the week. To arrange a day that suits you, phone 07833 053749 or use the contact form with the address and the days you’d prefer.
Checking the roof from the ground
A lot can be seen from ground level. Binoculars help you spot slipped slates or tiles, gaps along the ridge and a leaning stack. Please do not climb up for a closer look.
During heavy rain, look at the gutters from ground level or a window. Water spilling over the edge can point to a blockage or a sagging run.