Greater London · London and the South East
South Harrow Electronic Leak Detection
Know where you stand with the flat roof membrane before you spend money on it. We carry out electronic leak detection in South Harrow.
- Leaks showing away from the breach
- New roofs to check before paving or planting
- Leaks under green or ballasted roofs
Flat roofs in South 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. Hips, bay roofs and later loft conversions are typical of those semis, if your home is one of them. Flat roofs fill the gaps in between, on extensions, garages, dormers and business premises. The wider area around South Harrow has a long history of building, with Northolt Manor about 1.5 miles south-west. If you own one of the older houses, expect a mix of original materials and later repairs on the roof, and a listed home or one in a conservation area may need consent for changes of material.
Landlords with a home close to Northolt Park station may find that a flat roof over a rented flat is easy to forget until the tenant reports a leak. For site and facilities teams at buildings like The Welldon Park Academy, ponding and blocked outlets on a wide flat roof are worth catching before the next wet season. Controlled parking zones are common in London, so mention any permit rules for South Harrow, along with any off-street space.
South Harrow is about 1 mile south of Harrow, in Greater London. Wherever you are in South Harrow, we can carry out electronic leak detection at your property. Across Greater London, we cover South Harrow. You can also see our page for London.
We survey roofs across HA2, HA1 and UB5 for electronic leak detection and the streets around it. Whether your property is on Park Lane, Grange Road and Dudley Road or a nearby road, we can help. Neighbouring places we cover for electronic leak detection include Roxeth (1 mile north-east), Harrow (1 mile north), Harrow on the Hill (1 mile east), Rayners Lane (1 mile north-west) and Northolt (1 mile south-west). We also work in nearby towns like London (12 miles east), City of Westminster (9 miles east), Marylebone (9 miles east), Kensington (8 miles south-east), St Pancras (10 miles east) and Shoreditch (12 miles east).
Local landmarks in South Harrow
Around South Harrow, our work takes us to homes and buildings near Orley Farm School, Northwick Park and St Dominic's Sixth Form College and the streets around them. The nearest railway station is Northolt Park station, roughly 0.5 miles south-west of the centre. Other landmarks nearby include St. George's Shopping Centre (1.3 miles north-east) and Kodak Museum (2 miles north). For a walk, there’s Middle Lake and Northala Fields.
About our electronic leak detection in South Harrow
You get a report showing the location of each breach with photos. It tells your roofer exactly where to repair rather than guessing. We don’t estimate repair costs; that’s for your roofer to price. A retest after repairs can check the work if the build-up allows. Results come in a written report with photos. If you’ve noticed breaches hidden under paving or planting and leaking laps in the waterproofing, we can find out what’s behind it.
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. In South Harrow, roof access is agreed with the building manager or owner beforehand. Rooflights, plant supports and pipe entries are common places for a membrane to fail.
Nothing in the report is left vague: if work is needed, the report says so clearly.
- Location
- South Harrow (HA2, HA1, UB5)
- Region
- Greater London
- Cost
- Quoted for your roof
- Your report
- A written report with photos, by email
- Survey days
- Weekdays and weekends
- Insured
- Professional indemnity and public liability
- Phone
- 07833 053749
- Last updated
- 27 October 2026
What you can safely check yourself
Your own check is a good start, but it isn’t a survey. From ground level, valleys, flashings and the backs of chimneys are often out of sight, and those are details a survey looks at closely.
Watch the gutters in a downpour, from a window or the ground. Overflowing water can point to a blockage or a sagging run.
Prices for electronic leak detection in South Harrow
All our prices include VAT. What changes the price is:
- The use of thermal imaging or a drone
- Chimneys, valleys, parapets and other details
- How tall the building is and how easy the roof is to see
- Commercial roofs and larger buildings
All our prices include VAT. We quote electronic leak detection for each roof, as the method and time depend on the roof. You’ll know the price for your survey before booking.
What to tell us when you get in touch
Before you get in touch, it helps to have:
- The type of building and roof, such as pitched or flat
- What made you get in touch
- The address and postcode of the property
- Where water is showing inside, if it is
If you’re buying, it helps to book soon after your offer is accepted, so there’s time to use the report before exchange. For any other survey, just phone 07833 053749 or drop us an email when you are ready.
South Harrow: your questions answered
Do you cover South Harrow?
Yes. We work right across London and the South East, and South Harrow is part of that. You can phone 07833 053749 or email us with the address and a few details, and we will talk through which survey suits.
How do I find out if my home in South Harrow is listed?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. If a home is listed, changes that affect its special interest need listed building consent, and in a conservation area re-roofing in different materials may need permission.
How do I book a survey in South Harrow?
Simply phone 07833 053749 or email us with the address. After a few questions, we confirm the price and fix a day, weekday or weekend.
Do you need to get into the loft?
If it is needed and safe to reach, yes. Inside, we look for damp, staining, gaps and sagging, as far as the space allows.
How long will testing take?
It depends on the size of the roof and its build-up. You’ll know roughly how long before we start.
Is it a structural engineer’s report?
No. We note visible signs such as sagging or deflection, but we don’t carry out calculations or give an engineer’s opinion. If we think you need an engineer, the report says so.
Does someone need to be in?
That depends on the survey. Inside the building and in the loft, we need someone to let us in, while outside access can be discussed when you book.
Also near South Harrow
More services for South Harrow
For landlords and managing agents
Managing agents and residents’ management companies use roof surveys to plan maintenance. Recommendations are set out in order of urgency where relevant.
A roof problem in a let property affects your tenants as well as the building. A survey shows what needs attention, so you can plan the work around your tenants.
Tips from our surveys
Some practical points come up on survey after survey. They’re worth knowing whatever the roof:
- Test new membranes before covering them
- Record dates and spots where water appears
- Act on new leaks promptly
- Do not keep patching the same spot
After your roofer repairs the breaches, a retest can confirm them, where the roof still suits the method.
Don’t leave a flat roof leak running. Water under a membrane can spread.
What we do, step by step
Safety comes first on every visit. Everything that can safely be seen is inspected, and if part of the roof cannot be seen, the report says so. The survey usually takes a length of time set by the membrane area and the build-up, which we’ll explain when we quote. For a visit in South 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 roof space and from the roof where it is safe.
- First, we confirm which roof areas are included.
- We get the roof ready for testing.
- Testing runs across the agreed area.
- We mark the breach locations in our records.
- The report is sent for your roofer to act on.
Getting ready for the survey
- Tell us about any leaks, stains or damp patches you know of
- Let us know where we can park nearby
- Make a note of anything you’d like us to look at
Book a survey
You can call us seven days a week. To book or ask a question, phone 07833 053749 or drop us an email.
Related advice
Different roofs, different checks
Liquid-applied waterproofing
Small holes in liquid waterproofing may leak. Where the roof suits it, testing can find them.
Green and ballasted roofs
ELD is easier on a new roof before it’s covered.