Surrey · London and the South East
St John's Electronic Leak Detection
Electronic leak detection in St John's from an independent, experienced roof surveyor. More than 20 years and over 5,000 surveys across London and the South East.
- A flat roof leak that can’t be traced
- Leaking laps in the waterproofing
- New membranes needing a check before handover
About our electronic leak detection in St John's
ELD finds breaches in the membrane, not every cause of water getting in. Water coming through walls, copings, rooflights or plumbing will not show on the test. If the evidence points elsewhere, we will say so. The test shows breaches in the membrane, not water coming through masonry or around frames. Our report keeps that distinction clear. You will also know what to check next. We’re frequently asked to look into gaps at membrane joints and new membranes needing a check before handover, across single-ply roofs, liquid-applied waterproofing and roof terraces and balconies.
Around a smaller place like St John's, flat roofs usually cover extensions, garages and dormers. They’re small, but a leak over a kitchen extension can do a lot of harm. What it’s covered in, and how well it was laid, decides what it needs, from felt and asphalt to EPDM rubber and GRP. From an upstairs window, look for standing water, splits and edges coming away.
It isn’t only a list of defects. For each finding, it explains what it is, why it matters and what we’d recommend.
- Where
- St John's (GU21, GU22)
- Region
- Surrey
- Price
- Quoted for your roof
- Your report
- A written report with photos, by email
- When we survey
- Weekdays and weekends
- Insurance
- Professional indemnity and public liability
- Telephone
- 07833 053749
- Last updated
- 27 October 2026
What we are asked to look at in St John's
On a flat roof, water spreads under the waterproofing. The leak may show some distance from where water gets in, so tracing it by eye is difficult.
Most people get in touch when they’ve noticed one of these:
- A flat roof leak that can’t be traced
- Repairs that haven’t stopped the leak
- Holes left by work on the roof
- Leaks under green or ballasted roofs
For businesses in and around places like The Peacocks, a flat roof over a business is out of sight and out of mind until it leaks.
Before you book any roof surveyor
- Which limits apply to the survey
- Whether the price includes VAT
- Whether any drone flown is registered with the CAA
- What exactly goes into their report
Also near St John's
Other services in St John's
What happens on the day
A survey visit follows a simple order: we hear what you’ve seen, look at the roof from every safe viewpoint, take photos as we go and record our findings for the written report. It typically takes longer on a large roof than a small one, and the build-up of the roof makes a difference too. A visit to St John's is planned like any other: the time, the access and where to park are agreed in advance. Weekday and weekend visits are both possible. Let us know about any garages, outbuildings or extensions you want included.
- We ask about the roof, its age, its membrane and where leaks appear inside.
- We check that the membrane and build-up suit electronic leak detection.
- The method depends on the membrane and what sits above and below it.
- The roof is tested and any breaches are located.
- The breaches are recorded with photographs in a report for your roofer.
How to prepare
- Let us know about parking near the property
- If it is not your property yet, arrange access through the agent
- Dig out any old roof reports or invoices
How to book
To get a price for electronic leak detection in St John's, phone 07833 053749 or drop us an email. A few details about the property and the roof help us give you an accurate price.
Read more
Checking the roof from the ground
After strong wind, take a look from the pavement or garden: pieces of tile or slate on the ground, a gap in the ridge or a lifted flashing are all worth noting. Leave anything above ground level to a survey.
If you have a loft with safe access, take a look inside. Take a torch and only step on boards or joists, and look for staining, damp timber or daylight coming through.
What happens if roof problems are left?
Chasing a leak again and again is frustrating. A report showing the breach points gives your roofer a clear target. Around St John's, a leak in an older house can soak into timbers and plaster, which is far harder to put right than the roof fault itself.
To find out what your survey will cost, ring 07833 053749 or drop us an email with the address and a few details. We’ll confirm the figure before booking.
Why us?
- Photographs and a written report every time
- Covered by professional indemnity and public liability insurance
- 20+ years’ experience
- Customer satisfaction of 98%
Take a look at how roof surveys are priced or our case studies.
Local flat roofs in St John's
If your home is older, it’s worth knowing whether it is listed or in a conservation area before planning roof work. Changes that affect a listed building’s special interest need listed building consent, and councils can also use Article 4 directions to control changes in conservation areas. Many older homes in Surrey have handmade clay tiles and tile-hung upper walls. Horsham stone slab roofs survive on some old buildings in Surrey. Next to the main roofs there’s normally a flat roof somewhere, whether on an extension, a garage or a commercial unit.
If you let a flat or house near Woking station, flat roofs on let property tend to be checked only when they fail, which is the costly way round. If you look after a building like The Winston Churchill School A Specialist Sports College, ponding and blocked outlets on a wide flat roof are worth catching before the next wet season.
St John's is about 1 mile west of Woking, in Surrey. We cover St John's and the rest of Surrey. Our area takes in places right across Surrey, large and small.
Here we cover the GU21 and GU22 postcode area for electronic leak detection. Local streets include Pond Road, Copse Road and Raglan Road, all of which we cover. St John's sits on or near the A324, so getting to you is simple. Close by, we survey roofs in Goldsworth Park (1 mile north-east), Woking (1 mile east), Westfield (2 miles south-east), Horsell (2 miles north-east) and Mimbridge (2 miles north). Larger places within reach include Guildford (5 miles south), Camberley (6 miles west), Epsom (14 miles east), Farnham (11 miles south-west), Ewell (15 miles east) and Egham (8 miles north).
Local landmarks in St John's
In St John's, that means homes and buildings near Hoe Valley School, The Oaktree School and Royal Oak pub and the streets around them. The nearest railway station is Woking station, roughly 1.6 miles east. Nearby you will also find Brookwood Hospital (1 mile west) and The Peacocks (1.6 miles east). Not far away are Brookwood Lye.
How we price electronic leak detection
All our prices include VAT. What changes the price is:
- Whether it’s a home or a commercial building
- If the survey needs thermal imaging or a drone
- Chimneys, valleys, parapets and other details
- How many separate roofs there are, like extensions, dormers and garages
Every price we give includes VAT. Electronic leak detection is quoted for your roof, because the method depends on the roof. You will know the exact price before booking.
Booking your survey
Here’s what helps us most when you get in touch:
- How the loft is reached, if there is one
- Pictures from the garden or a window, if you have them
- Your timetable, such as an exchange date
- What made you get in touch
Surveys can be booked for weekdays, Saturdays or Sundays. To find a date that works for you, phone 07833 053749 or email us with the address and the days you’d prefer.
Common questions in St John's
How do I find out if my home in St John's is listed?
We cannot 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.
Is St John's in the area you cover?
Yes, St John's is within the area we cover. We work right across London and South East England. You can phone 07833 053749 or use the contact form with the address and some details, and we’ll talk through which survey suits.
How experienced are you?
We have more than 20 years’ experience and have completed over 5,000 surveys across London and the South East.
Does ELD work under paving or planting?
On some roofs, yes. What sits on the membrane affects the method, so we check the build-up first.
How do I arrange electronic leak detection in St John's?
Simply phone 07833 053749 or send us an email with the address. After a few questions, we confirm the price and fix a day, weekday or weekend.
Can you tell me if my roof has asbestos?
No. Our report may flag materials that could contain asbestos, but only a specialist asbestos surveyor can confirm it. It may be present in buildings built or refurbished before 2000.
What will the report tell me?
It sets out what we found, why it matters and what we recommend, with photographs throughout. Anything we couldn’t see safely is noted too.
What we cannot see
Some things cannot be seen without opening up the roof, so a survey has limits:
- Water entering through details rather than the membrane
- Moisture spread under the membrane
- Areas we cannot reach or that can’t be tested
If you are not sure which survey you need, ring 07833 053749 or email us and we will give you a straight answer before you book. The full list of what we check.
What we look at
- Green roofs
- Single-ply roofs
- Flat roof membranes
- Roof terraces and balconies
- Commercial flat roofs
- Liquid-applied waterproofing