Greater London · London and the South East
Mayfair Electronic Leak Detection
Know where you stand with the flat roof membrane before you decide what to do next. Electronic leak detection in Mayfair.
- Stains far from any visible defect
- Holes around roof penetrations
- Leaks under green or ballasted roofs
What we do, step by step
You do not need to do much on the day. Show us any stains, drips or problem areas you know about, and we will get on with the inspection. The survey itself takes a length of time set by the membrane area and the build-up, which we set out in the quote. From the street, a London terrace typically shows only its front slope or parapet, so a visit in Mayfair moves between viewpoints: the pavement, upstairs windows, the loft and any safe spot at the back. If other people live in the building, let us know who can let us into the shared parts.
- We start by finding out what the roof is made of and where it leaks.
- We check that the membrane and build-up suit electronic leak detection.
- 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 photographs in a report for your roofer.
Preparing for the visit
- Tell us about parking before the day
- Move anything stored under the loft hatch
- Agree roof access with the managing agent if it is shared
Book a survey
Surveys can be booked for weekdays, Saturdays or Sundays. To arrange a day that suits you, phone 07833 053749 or use the contact form.
Related advice
Electronic leak detection in Mayfair
Electronic testing locates holes in the waterproofing, not every cause of water getting in. Leaks from walls, copings, rooflights or pipes need other checks. We will tell you if we think the leak is coming from somewhere else. The test shows breaches in the membrane, not water coming through masonry or around frames. The report makes clear what was and wasn’t tested. We will point you to the likely next step. Typical surveys look at breaches around outlets and penetrations and holes left by work on the roof, on commercial flat roofs, liquid-applied waterproofing 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 converted house in Mayfair, the roof above may belong to the building rather than one flat.
Nothing in the report is left vague: where something needs attention, it says so plainly, and where it can wait, that’s said too.
- Place
- Mayfair (W1K, W1F, W1U)
- Region
- Greater London
- Cost
- Quoted for your roof
- Your report
- A written report with photos, by email
- Survey days
- Weekdays, Saturdays and Sundays
- Insurance
- PI and public liability insurance
- Telephone
- 07833 053749
- Updated
- 27 October 2026
Landlords, agents and block managers in Mayfair
Shared roofs need a little more planning: we need access agreed with the building owner or managing agent. Tell us about it when booking and we’ll plan the survey around it.
If you own several properties, surveys can be booked for more than one address. To discuss a number of properties, phone 07833 053749 or email us.
More services for Mayfair
FAQs for Mayfair
Does a conservation area affect roof work in Mayfair?
We can’t confirm that for you, but Historic England’s list and your council can. Both listing and conservation areas can limit changes of roofing material, and councils can also use Article 4 directions.
Can parking be tricky for a visit in Mayfair?
Typically it is manageable with a little notice. Tell us what parking is available nearby, and the visit is planned around it.
How quickly is the report sent?
The Premium Survey report comes the same day, the Standard within 24–48 hours and the Basic within 48 hours. Each one is emailed.
What’s the best way to book?
The quickest way is to call 07833 053749 or drop us an email. Give us the address and some details about the roof, and we’ll suggest the right survey. Surveys run seven days a week.
Can you give me structural calculations?
No. Our survey is not a structural engineer’s report, and it doesn’t include calculations. If we see signs that need an engineer’s opinion, we will recommend one.
Do you survey roofs on blocks of flats?
Yes. Shared roofs just need a little more planning, with the freeholder or managing agent. Tell us about it as you book and we’ll plan the survey around it.
Can you survey at the weekend?
We survey on any day from Monday to Sunday, during the day. Just say which days work for you.
Signs you need electronic leak detection in Mayfair
Holes in a membrane frequently come from feet, tools or debris. Some are too small to see but water still finds them.
We are often asked to look at:
- Leaks through a covered membrane
- Punctures from foot traffic or tools
- New roofs to check before paving or planting
- Stains far from any visible defect
For site and facilities teams at buildings such as LITE Regal International School, ponding and blocked outlets on a wide flat roof are worth catching before the next wet season.
Choosing a roof surveyor
- Do they have a CAA Flyer ID and Operator ID for drone work?
- Whether you get a written report with photos
- Will they check the loft as well as the outside?
- Is VAT included in the price?
Roof by roof
Green and ballasted roofs
Testing before planting or ballast goes on is simpler.
Liquid-applied waterproofing
Pinholes in a coating can let water through. ELD can help locate them on suitable roofs.
Tips that help
A survey works best with a little help from you, before and after. Tips:
- Record dates and spots where water appears
- Let us know about the membrane and build-up if you know it
- Act on new leaks promptly
- Don’t keep patching the same spot
Once repairs are made, the roof can be tested again if you want to check them, where the roof still suits the method.
Keep people off the flat roof unless they need to be there. Many breaches come from foot traffic.
Why it is worth a survey now in Mayfair
Testing a new membrane before it’s covered is easier than tracing a leak later. Covered roofs are harder to test. Behind a London parapet, a blocked gutter can sit full of water without anyone seeing it. When the stain finally shows, the damage underneath is often older than it looks.
Larger roofs, taller buildings and commercial roofs take longer, so the price reflects that. You will know the figure before booking.
What you get with us
- Over 20 years’ experience
- Drone flown under a CAA Flyer ID and Operator ID
- More than 5,000 surveys completed
- Surveys on weekdays, Saturdays and Sundays
Take a look at what a roof survey costs and what we found on two real jobs.
Electronic leak detection in Mayfair: local notes
Welsh slate on Victorian and Edwardian terraces is a familiar sight across inner London. Behind many of their parapets sit butterfly roofs and valley gutters that cannot be seen from the pavement. If your home in Mayfair is one of them, lead flashings, party-wall upstands and shared chimney stacks are part of the picture too. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere. There are several hotels within about a mile and a half of Mayfair. If you look after one, a leak through a flat roof can put a room out of use.
For hotels and guest houses around Mayfair, a roof problem found early is far less disruptive than one found by a guest. If you let a flat or house near Bond Street station, a flat roof over a rented flat is easy to forget until the tenant reports a leak.
Mayfair is about 1 mile south-east of City of Westminster, in Greater London. Houses, flats, blocks and commercial buildings in Mayfair can all book electronic leak detection, with a written report and photographs every time. Mayfair is one of the towns and villages in Greater London where we work for electronic leak detection.
We survey roofs across the W1K, W1F and W1U postcode area for electronic leak detection. That includes homes and businesses on Park Lane, Bruton Lane and Market Mews. Being close to the A4201 and A4202, Mayfair is simple for us to get to. If you are just outside Mayfair, we cover Burlington Estate (1 mile east), City of Westminster (1 mile north-west), Marylebone (1 mile north), St James's (1 mile east) and Chinatown (1 mile east). Further out, we also cover Shoreditch (3 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles north-east), Whitechapel (3 miles east), Hampstead (3 miles north-west) and Ruislip (12 miles west).
Near you in Mayfair
Locally, jobs take us to homes and businesses close to Royal College of Nursing Library & Museum, Coach and Horses pub and St George's Church of England Primary School. Also close by are Green Park (0.5 miles south) and The St Marylebone CofE School (0.8 miles north). Mayfair has its own railway station: Bond Street station. A little further out are Montfichet's Tower (2 miles east) and London Eye Hospital (0.5 miles north). Green spaces nearby include Ludgate Hill and St. James's Park Lake.