Greater London · London and the South East
Collier Row Electronic Leak Detection
Electronic leak detection to pinpoint holes in flat roof membranes around Collier Row, with findings in writing and pictures to back them up. Book a weekday or weekend visit.
- Leaks through a covered membrane
- Leaks that return after repairs
- Leaking laps in the waterproofing
Honest limits
Without opening up the roof, some things stay hidden, and that sets some limits:
- Repairing the breaches (that’s for your roofer)
- Moisture spread under the membrane
- Build-ups without a suitable layer below
If in doubt, ring 07833 053749 or email us and we’ll suggest the right survey before booking. What our survey covers.
Roofs we survey in Collier Row
- Flat roof membranes
- Commercial flat roofs
- Single-ply roofs
- Liquid-applied waterproofing
- Roof terraces and balconies
- Green roofs
About our electronic leak detection in Collier Row
Electronic leak detection, or ELD, finds holes in flat roof waterproofing membranes. It uses a small electrical current that passes through the membrane only where there is a breach. It can find holes too small to spot by eye so your roofer knows exactly where to repair. The results come in a report with photos. We are often asked to look into leaks at pipes, outlets or fixings and waterproofing to test before it’s covered, across roof terraces and balconies, commercial flat roofs and flat roof membranes.
On a London roof terrace or a flat roof over a back addition, water often runs under the covering before it shows. Upstands against parapets, outlets and the edge where flat meets pitched are common entry points. In a block or conversion in Collier Row, the flat roof is often a shared part of the building.
The report is yours to share with whoever needs it: your solicitor, the seller, your insurer, a roofer or the building’s managing agent.
- Where
- Collier Row (RM1, RM5, RM7)
- Wider area
- Greater London
- Cost
- Quoted for your roof
- Reports
- Written, with photos, emailed to you
- Survey days
- Weekdays and weekends
- Cover
- Professional indemnity and public liability
- Phone
- 07833 053749
- Page updated
- 27 October 2026
Questions from Collier Row
Does a conservation area affect roof work in Collier Row?
The council and Historic England’s list are the places to check. Either can affect what roof work is allowed, so it’s worth checking before planning any.
Is parking a problem for a survey in Collier Row?
Sometimes, yes. If Collier Row has controlled parking where you are, a visitor permit is the easiest answer.
Which days do you carry out surveys?
Visits run seven days a week in the daytime. Let us know your preferred days as you book.
Will you go up on the roof?
Not unless it’s safe. Safe viewpoints, the loft space and a drone where applicable cover most of what’s needed, and anything out of sight is recorded in the report.
Are you structural engineers?
No. Visible signs like deflection or sagging are recorded, but we don’t provide calculations or an engineer’s opinion. If one is needed, the report says so.
How soon will I get the report?
Basic reports arrive within 48 hours, Standard reports in 24–48 hours and Premium reports on the same day. Each one is emailed.
What’s in the report?
You get our findings in writing, part by part, with photos, finishing with recommendations. The most urgent items are made clear.
Surveys for landlords and agents in Collier Row
Buyers’ agents can book surveys on behalf of their clients. The report is emailed, so it can go straight to your client, photographs included.
With a portfolio of properties, you can book surveys for several addresses. To discuss a number of properties, phone 07833 053749 or email us.
Also near Collier Row
What else we do in Collier Row
Signs you need electronic leak detection in Collier Row
Work on the roof can damage a membrane. Fixings, equipment and foot traffic can leave small holes.
Things that often lead to a survey include:
- Punctures from foot traffic or tools
- Water coming in under a flat roof
- Holes around roof penetrations
- New membranes needing a check before handover
Take a building like Rise Park Infant School: a large flat roof with a good many outlets and rooflights has many places where a membrane can fail.
What to check before booking
- What they won’t be able to tell you
- When you will get the report
- Whether the inside of the roof is included
- How they plan to inspect the roof safely
How the survey works
The visit usually starts outside and finishes in the loft: first the slopes, edges and gutters from every safe viewpoint, then the roof space where it can be reached. In total, it takes longer on a large roof than a small one, and the build-up of the roof makes a difference too. London terraces rarely offer a view of the whole roof from one spot, so a visit in Collier Row moves between viewpoints: the pavement, upstairs windows, the loft and any safe spot at the back. If other people live in the building, tell us who can let us into the shared parts.
- 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.
- We pick the low-voltage or high-voltage method that suits the roof.
- Testing runs across the roof to locate breaches in the membrane.
- The breaches are recorded with photographs in a report for your roofer.
Getting ready for the survey
- Let us know about parking before the day
- Let us know about any leaks, stains or damp patches you know of
- Make sure pets are kept safely away
Book a survey
Getting a price is simple: just ring 07833 053749 or send us an email, tell us about the property and we’ll explain which survey suits. We confirm the price before anything is booked.
Read more
What electronic leak detection looks like in Collier Row
Outer London has a good many 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. Historic houses such as Hare Hall, about 1.7 miles east, show how far back building in the area around Collier Row goes. 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.
If you run a business near Romford Shopping Hall, the flat roofs over shops and commercial units are worth checking before a leak, not after. As a London address, Collier Row can be tricky for parking: a visitor permit or a nearby bay makes the day easier.
Collier Row is about 1 mile north of Romford, in Greater London. We carry out electronic leak detection for householders, landlords and businesses in Collier Row and nearby. We cover towns and villages across Greater London. You can also see our page for London.
Postcode districts we cover here for electronic leak detection: RM1, RM5 and RM7. You’ll find streets like Elm Road, Percy Road and Seymer Road, all of which we cover. We also cover the places around Collier Row: Rise Park (1 mile north-east), Romford (1 mile south), Marks Gate (1 mile west), Chadwell Heath (2 miles south-west) and Rush Green (2 miles south). Larger places within reach include London (13 miles south-west), City of Westminster (15 miles west), Marylebone (15 miles west), St Pancras (13 miles west), Shoreditch (12 miles south-west) and Walthamstow (8 miles west).
Around Collier Row
We work in homes and buildings around Colley Rowe Inn, Marshalls Park Academy and Raphael Park and the streets around them. The nearest railway station is Romford station, roughly 1.3 miles south of the centre. Well-known places in the area include Romford Shopping Hall (1 mile south) and Oldchurch Hospital (1.5 miles south). Green spaces nearby include Bedfords Park.
DIY checks: what’s safe
You can learn a lot from the ground. Binoculars help you spot slipped slates or tiles, gaps along the ridge and a leaning stack. Never climb onto the roof to look.
A DIY look is useful, but it isn’t a survey. You will not see flashings, valleys or the backs of chimneys properly from ground level.
How the survey changes by roof type
Green and ballasted roofs
Some layers may need lifting for testing. We explain what’s needed when we quote.
Bituminous membranes
Older felt roofs often have seams and patches that can leak. We test where the roof suits it.