Greater London · London and the South East
Electronic leak detection in Preston, Greater London
Electronic leak detection to pinpoint holes in flat roof membranes in Preston, carried out by an experienced roof surveyor. Every survey comes with a written report and photographs.
- Water coming in under a flat roof
- Breaches around outlets and penetrations
- Leaks under green or ballasted roofs
Electronic leak detection for homes and businesses in Preston
You get a report showing the location of each breach with photos. Your roofer can then repair those points instead of hunting for the leak. We do not estimate repair costs, so your roofer prices the work. Testing again after repairs can confirm the breaches have been dealt with if the build-up allows. Results come in a written report with photos. We survey roof terraces and balconies, flat roof membranes and commercial flat roofs, and people most frequently book us about new membranes needing a check before handover and leaks under green or ballasted roofs.
London has a lot of flat roofs: rear additions, dormers, roof terraces and the roofs of blocks 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 Preston, as anywhere in London, the right approach depends on what the roof is made of. Many older flat roofs are felt or asphalt, and many newer ones EPDM rubber or GRP.
The report is written in plain words, so it makes sense without any roofing background. Each point is backed by a photo where possible, with the urgent items made clear.
- Where
- Preston (HA9, HA3, HA0)
- Region
- Greater London
- Prices
- Quoted for your roof
- Your report
- Emailed report with photos and recommendations
- When we survey
- Monday to Sunday, daytime
- Insured
- PI and public liability insurance
- Phone
- 07833 053749
- Page updated
- 27 October 2026
When to book a survey in Preston
Work on the roof can damage a membrane. Engineers fitting equipment, solar panels or aerials may leave damage behind.
We are frequently asked to look at:
- Gaps at membrane joints
- Stains far from any visible defect
- Leaks that return after repairs
- A flat roof leak that cannot be traced
If you look after a building such as Preston Park Primary School, large flat roofs, common on schools and other public buildings, need their outlets, upstands and coverings checked regularly.
Before booking any roof surveyor
- Whether the inside of the roof is included
- Whether VAT is added on top
- Are they insured for the work?
- If they fly a drone, whether they hold a CAA Flyer ID and Operator ID
DIY checks: what’s safe
Look up at the roof after a storm, from ground level: broken slates or tiles in the garden, gaps along the ridge or loose lead are signs to note. Don’t go up yourself.
The one thing to avoid is getting up close. Roofs are fragile and slippery. That part is for a survey, using safe viewpoints and a drone where applicable.
What happens on the day
A survey visit follows a simple order: we listen to what’s been worrying you, look at the roof from every safe viewpoint, take photographs as we go and record our findings for the written report. It typically takes longer on a large roof than a small one, with the construction of the roof playing a part too. In Preston, visits are available on weekdays and at weekends. It helps if you can point us to a visitor permit or a nearby bay, and to clear a path to the loft hatch. A back bedroom window can be the best vantage point for a rear addition, so we may ask to use one.
- First, you let us know about the roof build-up and where water is showing.
- The roof is assessed to see if electronic testing will work on it.
- The method depends on the membrane and what sits above and below it.
- We test the membrane and find where current is passing through it.
- The breaches are recorded with photographs in a report for your roofer.
Getting ready for the survey
- Gather any invoices or paperwork from past roof work
- Make sure pets are kept safely away
- Let us know about parking before the day
How to book
Most bookings start with a short call: call 07833 053749 or email us and we’ll ask a few questions about the roof. The price is agreed before a date is set.
Advice
Common questions in Preston
Will parking be an issue for a roof survey in Preston?
London parking needs a little planning, so let us know about permits, bays or a driveway as you book. That way the visit can be planned around it.
Do you cover commercial flat roofs around Preston?
Yes, commercial flat roofs are part of what we cover. Larger commercial roofs are quoted for the building.
Does the report include photographs?
Yes. Photos are taken throughout the survey, and the report uses them to show each finding alongside our recommendations.
Does someone need to be in?
It depends on what we need to see. Inside the building and in the loft, we need someone to let us in.
How does ELD work?
The waterproofing membrane normally stops an electrical current, so wherever there’s a hole, it passes through. That lets us find breaches that are too small to see.
How quickly is the report sent?
It depends on the package: the Basic Survey report arrives within 48 hours, the Standard Survey in 24 to 48 hours and the Premium Survey the same day. The report is emailed to you.
Do you survey roofs on blocks of flats?
Yes, once whoever controls the roof agrees access. We look at the parts we are given access to.
Tips from our surveys
Most of what helps is simple and safe from ground level. Our suggestions:
- Consider ELD before paving or planting goes on
- Do not leave water getting in
- Stay off the flat roof unless needed
- Keep a note of leaks after rain
You receive a report showing where each breach was found, with photos. Your roofer uses it to carry out repairs.
Limit foot traffic on flat roofs. Many breaches come from foot traffic.
Rented homes, blocks and businesses
An agent can book and manage the survey for a landlord, with the report sent to whoever needs it. We agree a time with the tenant beforehand.
We survey roofs for landlords and agents as well as homeowners. A written report with photos gives you a clear record of the flat roof membrane.
Also near Preston
Other services in Preston
Local flat roofs in Preston
Within a mile and a half or so of Preston there are several hotels, and hotels, like offices and blocks of flats, frequently have flat roofs. If you look after one, a leak through a flat roof can put a room out of use. With Headstone Manor about 3 miles north-west, Preston 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.
For hotels and guest houses around Preston, a roof problem found early is far less disruptive than one found by a guest. Shop and office owners around London Designer Outlet may find that a flat roof over a business is out of sight and out of mind until it leaks.
Preston is about 1 mile north of Wembley, in Greater London. We carry out electronic leak detection for householders, landlords and businesses in Preston and the surrounding area. Preston is one of the towns and villages in Greater London where we work for electronic leak detection. London is in our area too.
Here we cover the HA9, HA3 and HA0 postcode area for electronic leak detection. That includes homes and businesses on Quad Road, Tower Lane and The Avenue. If you’re just outside Preston, we cover Wembley (1 mile south), Wembley Park (1 mile south-east), Kingsbury (1 mile north-east), Queensbury (1 mile north) and Mapesbury (1 mile south-east). We also work in nearby towns such as London (10 miles south-east), City of Westminster (7 miles south-east), Marylebone (7 miles south-east), Kensington (6 miles south-east), St Pancras (8 miles east) and Shoreditch (10 miles east).
Landmarks near Preston
Locally, jobs take us to homes and businesses close to Windermere pub, Preston Manor School and Preston Park, among other places. For rail, the closest station is South Kenton station, about 0.6 miles west of the centre. Other landmarks nearby include London Designer Outlet (1.1 miles south-east) and Kodak Museum (2.6 miles north-west). For a walk, there is Masons Field and Castlebar Hill.
What this survey can’t tell you
A survey is a careful look at the flat roof membrane, but it can’t do everything. The main limits are:
- Fixing the holes we find
- Moisture spread under the membrane
- Leaks from plumbing or windows
Not sure which survey suits your roof? You can phone 07833 053749 or send us an email and we’ll tell you before booking. What our survey covers.
What we look at
- Green roofs
- Liquid-applied waterproofing
- Single-ply roofs
- Roof terraces and balconies
- Commercial flat roofs
- Flat roof membranes