Greater London · London and the South East
Electronic leak detection in North Harrow, Greater London
Get a clear view of the flat roof membrane at a property in North Harrow from an independent roof surveyor. We visit on weekdays and at weekends.
- Holes around roof penetrations
- Leaks through a flat roof with no obvious cause
- Patched roofs that still leak
How the survey works
The visit normally starts outside and finishes in the loft: outside views come first, then the loft space if there is safe access. In total, it takes a time that depends on the roof’s area and construction, which we set out in the quote. For a visit in North Harrow, parking and access are the things to plan: let us know about parking, the floor the property is on, any shared entrance and loft access. On the day, the roof is looked at from the ground, from windows, from inside the loft space and from the roof where it is safe.
- 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.
- The method depends on the membrane and what sits above and below it.
- Testing runs across the roof to locate breaches in the membrane.
- We send a report with photos of each breach so your roofer can repair it.
Before the survey
- If you are buying, let the agent know when we are coming
- Let us know where we can park nearby
- Keep pets out of the way during the survey
Arrange a survey
We confirm the price for the job before booking, so you know where you stand. 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
Electronic leak detection for homes and businesses in North Harrow
We carry out electronic leak detection on flat roofs in North Harrow and across London and South East England. Testing typically takes as long as needed for the roof’s area and construction, which we’ll explain when we quote. Every roof is quoted on its size and build-up. You get a report with photographs. If you’ve noticed leaks showing away from the breach and leaking laps in the waterproofing, a survey will tell you what’s going on.
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, each with its own weak points. Which one is on a roof in North Harrow shapes how it’s checked. Older flat roofs are frequently felt or asphalt, newer ones rubber or GRP.
Findings are set out part by part, from the coverings down to the gutters. You’ll see the good as well as the bad.
- Place
- North Harrow (HA2, HA1, HA5)
- Region
- Greater London
- Price
- Quoted for your roof
- Report
- A written report with photos, by email
- When we survey
- Weekdays, Saturdays and Sundays
- Cover
- PI and public liability insurance
- Call
- 07833 053749
- Page updated
- 27 October 2026
DIY checks: what’s safe
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.
Your own check is a good start, but it is not a survey. From the ground, valleys, flashings and the backs of chimneys are often out of sight.
Also in North Harrow
Flat and commercial roofs around North Harrow
Outer London has lots of Victorian and Edwardian terraces with slate roofs, but also a great many interwar semis, frequently with hipped roofs in 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. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere. With Headstone Manor about 0.8 miles north-east, North Harrow sits in an area with a long building history. Older roofs in the wider area can hide decades of patch repairs, so the detail matters, and any change of roofing material on a listed home needs checking with the council first.
Controlled parking zones are common in London, so mention any permit rules for North Harrow. For an older house near a landmark such as Church of St Alban, the joins between later flat roofs and the old walls are where problems normally start.
North Harrow is about 1 mile north-west of Harrow, in Greater London. Whether the building in North Harrow is a house, a flat or a commercial unit, we can survey the roof on a weekday or at the weekend. We cover towns and villages across Greater London. We also survey roofs in London.
All of HA2, HA1 and HA5 is within our area for electronic leak detection, from the main roads to the quietest streets. Streets in the area include The Avenue, Pinner Road and Durham Road, all of which we cover. Neighbouring places we cover for electronic leak detection include Rayners Lane (1 mile south-west), Harrow (1 mile south-east), Roxbourne (1 mile south-west), Eastcote (1 mile west) and Greenhill (1 mile east). Within a short drive, we also cover London (13 miles south-east), City of Westminster (10 miles south-east), Marylebone (10 miles south-east), Kensington (9 miles south-east), St Pancras (11 miles east) and Shoreditch (13 miles east).
Around North Harrow
Locally, jobs take us to homes and businesses close to Nower Hill High School, Heathfield School and Headstone Manor Recreation Ground and the streets around them. For rail, the closest station is Harrow-on-the-Hill station, roughly 1.2 miles east of the centre. Well-known places in the area include St. George's Shopping Centre (1 mile east) and Hilfield Castle (5 miles north). Not far away are Northala Fields and Islip Manor Meadows.
Signs you need electronic leak detection in North Harrow
Seams are a common weak point in flat roof waterproofing. Small openings at laps can leak long before anyone notices.
Signs worth acting on include:
- Leaks at pipes, outlets or fixings
- A flat roof leak that can’t be traced
- New roofs to check before paving or planting
- Breaches hidden under paving or planting
Landlords with a home close to Harrow-on-the-Hill station may find that flat roofs on let property tend to be checked only when they fail, which is the costly way round.
Before booking anyone
- Whether the roof space is looked at, where there is one
- What’s outside the scope of the survey
- What happens after the report arrives
- Whether they hold professional indemnity and public liability insurance
Roof by roof
Inverted and paved roofs
Inverted roofs have the insulation on top of the waterproofing, which affects testing.
Liquid-applied waterproofing
Liquid waterproofing has no laps but holes and thin areas can occur. Suitability for ELD depends on the system.
How we price electronic leak detection
The price reflects the time and kit the roof needs. That comes down to:
- Commercial roofs and larger buildings
- If the survey needs thermal imaging or a drone
- The height of the building and how the roof can safely be seen
- Chimneys, valleys, parapets and other details
Larger roofs, taller buildings and commercial roofs take longer, so the price reflects that. The price is confirmed before you book.
What to let us know when you contact us
The more you tell us, the easier it is to price the survey. When you contact us, let us know:
- Where the property is, with the postcode
- Whether there’s a loft hatch, a shared roof or tricky access
- The style of property, from a terrace to a block
- Where water is showing inside, if it is
Surveys can be booked for weekdays, Saturdays or Sundays. To arrange a day that suits you, call 07833 053749 or drop us an email with the address and the days you’d prefer.
Your questions about electronic leak detection in North Harrow
Do you carry out roof surveys in North Harrow?
Yes, North Harrow is within the area we cover. We cover the whole of London and South East England. You can phone 07833 053749 or send us an email with the address and a few details.
How do I find out if my home in North Harrow is listed?
The council and Historic England’s list are the places to check. It is worth checking before planning roof work, as both can affect what’s allowed.
Will you fly a drone over my roof?
Where it helps and the rules allow, yes. We hold a CAA Flyer ID and Operator ID and fly a drone under 250g, and the airspace and weather are checked before every flight.
Is this an asbestos survey?
No. We don’t carry out asbestos surveys or testing. If we see materials that could contain asbestos, such as cement roof sheets or soffits on buildings from before 2000, we flag them.
Does this replace a RICS home 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.
Does ELD include fixing the breach?
No. We test the membrane and report. You get the breach locations with photos for your roofer to repair.
How is ELD priced?
We quote for each roof individually. Let us know about the roof and where it leaks, and phone 07833 053749 or email us for a quote.
Why get it checked now?
Not every leak is in the membrane. Testing shows whether the membrane is breached, so other causes can be checked. London’s older roofs often have bitumen felt underlay or none at all, so once the slates or flashings let water past, little stops it reaching ceilings. 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, phone 07833 053749 or use the contact form with the address and some details. We will confirm the figure before booking.
Why choose Independent Roof Survey in North Harrow
- 98% customer satisfaction
- Over 5,000 surveys carried out
- Drone and thermal imaging surveys available
- Two decades and more of roof surveys