Buckinghamshire · London and the South East
Electronic Leak Detection in Knotty Green
Electronic leak detection to pinpoint holes in flat roof membranes across Knotty Green, with drones and thermal imaging where they help. Get in touch for a price.
- Patched roofs that still leak
- Breaches hidden under paving or planting
- Leaks at pipes, outlets or fixings
Electronic leak detection in Knotty Green: what you get
ELD is a way of pinpointing breaches in a flat roof’s waterproofing membrane. It works with an electrical current which can only get through the membrane at a breach. It can find holes too small to spot by eye so your roofer knows exactly where to repair. You get a photo-illustrated written report of each breach found. We survey flat roof membranes, liquid-applied waterproofing and single-ply roofs, and the problems we’re asked to look at most are damp inside with no sign on the roof and failed seams and laps.
Somewhere as small as Knotty Green, flat roofs tend to be on extensions, garages and converted outbuildings. The checks are the same as anywhere: the covering, the edges, the upstands and where water drains away. We simply plan the journey and access beforehand. If there are outbuildings or garages with flat roofs, mention them when you book.
After the visit, you get a written report with photos, emailed to you. It sets out the condition of the flat roof membrane, any defects and our written recommendations.
- Place
- Knotty Green (HP9)
- Wider area
- Buckinghamshire
- Prices
- Quoted for your roof
- Your report
- A written report with photos, by email
- When we survey
- Weekdays and weekends
- Cover
- Professional indemnity and public liability
- Call
- 07833 053749
- Page updated
- 27 October 2026
When to book a survey in Knotty Green
New membranes can have defects from installation. ELD on a new roof can show holes before they cause leaks.
Most people get in touch after spotting one of these:
- Punctures from foot traffic or tools
- Leaking laps in the waterproofing
- Stains far from any visible defect
- Breaches hidden under paving or planting
If you let a flat or house near Beaconsfield station, the flat roof over a let home is worth a look before it becomes a tenant complaint.
Before you book any roof surveyor
- Whether any drone flown is registered with the CAA
- Whether VAT is in the quoted price
- Whether the inside of the roof is included
- How long they’ve been surveying roofs
Common questions in Knotty Green
Do you carry out roof surveys in Knotty Green?
We do. Every survey there gets the same written report with photos.
How do I find out if my home in Knotty Green is listed?
We cannot confirm that for you, but Historic England’s list and your council can. A change of roofing material may need consent in either case, and councils can also use Article 4 directions.
Is this an asbestos survey?
No. Asbestos surveys and testing aren’t part of what we do. We flag materials that could contain asbestos, such as cement sheets or soffits on pre-2000 buildings.
What does electronic leak detection do?
A sound membrane blocks the test current, but a hole lets it through. That’s how we locate breaches you can’t see.
Is my roof suitable for ELD?
It depends on the membrane and the build-up. Share any details you have and we will check whether ELD will work.
How much time does ELD need?
It usually takes longer on a large roof than a small one, with the construction of the roof playing a part too.
Is it the same as a RICS Level 2 or Level 3 survey?
No. Our survey is a roof survey, not a RICS Level 2 or Level 3 survey of the whole building. It focuses on the roof, so it sits alongside a building survey rather than replacing it.
Landlord and commercial surveys in Knotty Green
Surveys can also be booked by buyers’ agents acting for a client. Reports are emailed, so they’re easy to pass on, photos included.
We survey roofs for letting agents and landlords as well as householders. A photo-illustrated written report gives you a clear record of the flat roof membrane, which helps you plan work between tenancies.
Different roofs, different checks
Bituminous membranes
Bituminous roofs often have laps and old repairs where breaches occur. Testing depends on the roof.
Green and ballasted roofs
Parts of the covering may have to come up. We explain what’s needed when we quote.
How it works
On the day, we start by asking what you’ve noticed and what you want to find out. We then inspect everything that can safely be seen, from ground level, from windows, in the loft space and by drone where applicable. Most surveys take as long as needed for the size of the roof and how it’s built, and we’ll give you a guide when quoting. Older roofs in small places like Knotty Green can have low, tight loft spaces, so let us know about the loft hatch and any ladder. Only areas that can be reached safely are inspected.
- You let us know about the roof and where water is showing.
- We check whether the membrane and build-up suit ELD.
- We choose a low-voltage or high-voltage method to match the roof.
- We test the roof and locate any breaches.
- You get a report with photos of each breach.
Getting ready for the survey
- Make sure the loft hatch can be reached
- Let us know where we can park nearby
- Show us where any leaks or stains appear
Book a survey
Most bookings start with a short call: call 07833 053749 or use the contact form and we’ll ask a few questions about the roof. You’ll have a price before anything is arranged.
Advice
What a survey costs
When we price a survey, we consider:
- Whether it’s a home or a commercial building
- How big the roof is
- How many separate roofs there are, such as extensions, dormers and garages
- The height of the building and how the roof can safely be seen
To find out what your survey will cost, phone 07833 053749 or use the contact form with the address and some details. The price is agreed before a date is set.
Getting in touch
When you call or email, these details help:
- Your timetable, such as an exchange date
- Your postcode, so we can check access and travel
- Whether there is a loft hatch, a shared roof or tricky access
- The type of building and roof, such as pitched or flat
We confirm the price for the job before booking, so you know where you stand. Electronic leak detection is quoted for your roof, because the method depends on the roof. For a price for your roof, call 07833 053749 or send us an email.
What this survey can’t tell you
Before booking, it is worth knowing what a survey won’t do:
- Areas we cannot reach or that cannot be tested
- The extent of water in the insulation
- Repairing the breaches (that is for your roofer)
If you are not sure which survey you need, phone 07833 053749 or send us an email and we’ll give you a straight answer before you book. What our survey covers.
Roofs we survey in Knotty Green
- Liquid-applied waterproofing
- Green roofs
- Commercial flat roofs
- Roof terraces and balconies
- Single-ply roofs
- Flat roof membranes
Flat and commercial roofs around Knotty Green
Historic houses like Cliveden, about 4.6 miles south, show how far back building in the area around Knotty Green goes. On older houses around here, roofs often carry the marks of earlier repairs, from replaced slates to new lead, and a listed home or one in a conservation area may need consent for changes of material. Some villages in Buckinghamshire still have thatched roofs. Across the South East, older homes tend to have slate or clay tiles, and many later ones concrete tiles. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere.
Take a building like St Mary and All Saints CofE Primary School: a large flat roof with lots of outlets and rooflights has many places where a membrane can fail. Take an older house close to Church of St Michael and All Angels: the flat roofs on later extensions tend to wear out long before the main roof.
Knotty Green is about 1 mile north of Beaconsfield, in Buckinghamshire. We survey roofs in Knotty Green and the rest of Buckinghamshire. Our area takes in places right across Buckinghamshire. We also survey roofs in Reading.
Postcode districts we cover here for electronic leak detection: HP9. If you need electronic leak detection at a property on Penn Road, Finch Lane and Mossway or anywhere close by, we can survey it. If you are just outside Knotty Green, we cover Forty Green (1 mile south-west), Beaconsfield (1 mile south), Ledborough (1 mile south-east), Beacon Hill (1 mile west) and Winchmore Hill (2 miles north). Further out, we also cover Aylesbury (15 miles north-west), High Wycombe (4 miles west), Chesham (6 miles north), Marlow (6 miles south-west), Amersham (4 miles north-east) and Chalfont St Peter (4 miles east).
Local landmarks in Knotty Green
Locally, jobs take us to homes and businesses close to Davenies School, The Lion of Beaconsfield pub and Beaconsfield High School. For rail, the closest station is Beaconsfield station, about 0.9 miles south-east. Other landmarks nearby include High Wycombe Castle (4.1 miles west) and Amersham Hospital (3.2 miles north-east). Not far away are Holtspur Bank.