Kent · London and the South East
Knatts Valley Electronic Leak Detection
Electronic leak detection to pinpoint holes in flat roof membranes across Knatts Valley, using drones and thermal imaging where it applies. Get in touch for a price.
- Stains far from any visible defect
- Holes around roof penetrations
- Patched roofs that still leak
Electronic leak detection in Knatts Valley: what you get
Not every flat roof suits electronic testing. Certain membranes conduct electricity, and some build-ups lack the layer the test needs below the membrane. We’ll say if ELD will not work on your roof before any testing. Telling us what you know about the roof’s membrane and layers helps, including drawings, specifications or the roofer’s paperwork. It saves a wasted visit. We are often asked to look into new membranes needing a check before handover and punctures from foot traffic or tools, on commercial flat roofs, green roofs and flat roof membranes.
Somewhere as small as Knatts Valley, flat roofs tend to be on extensions, garages and converted outbuildings. The checks are the same as anywhere: outlets, upstands, edges and the covering itself. The journey and access are planned beforehand. Garages and outbuildings are easy to forget, so mention any you want included when you book.
Every survey ends with a written report, with photographs, emailed to you. It explains the condition of the flat roof membrane, the defects we found and what we recommend.
- Place
- Knatts Valley (TN15)
- Wider area
- Kent
- Price
- Quoted for your roof
- Reports
- A written report with photos, by email
- Survey days
- Weekdays and weekends
- Insurance
- PI and public liability insurance
- Phone
- 07833 053749
- Last updated
- 27 October 2026
Local flat roofs in Knatts Valley
About 2.8 miles north-west lies Lullingstone Castle, a reminder of how long the area around Knatts Valley has been built on. Period homes nearby can have lead valleys, tall chimneys and a patchwork of past repairs, and any change of roofing material on a listed home needs checking with the council first. Older houses across Kent frequently have handmade clay or peg tiles, and many have tile-hung walls. Kent’s older buildings take in oast houses and timber-framed Wealden hall houses as well. Flat roofs on extensions, dormers, garages and business units are found alongside them almost everywhere.
For site and facilities teams at buildings such as West Kingsdown CofE VC Primary School, ponding and blocked outlets on a wide flat roof are worth catching before the next wet season. For an older house near a landmark like Church of Saint Mary the Virgin, the joins between later flat roofs and the old walls are where problems normally start.
Knatts Valley is about 4 miles north-east of Sevenoaks, in Kent. In Knatts Valley, as across Kent, every roof gets the same careful survey. We cover towns and villages across Kent. You can also see our page for Maidstone.
Here we cover the TN15 postcode area for electronic leak detection. You will find streets like Knatts Lane and Knatts Valley Road, and we cover them all. Other places close to Knatts Valley include East Hill (1 mile north-west), Woodlands (1 mile south), Romney Street (1 mile west), West Kingsdown (1 mile north-east) and Cotman's Ash (1 mile south). Larger places within reach include Maidstone (13 miles east), Dartford (8 miles north), Sevenoaks (4 miles south-west), Royal Tunbridge Wells (14 miles south), Gravesend (9 miles north-east) and Tonbridge (9 miles south).
Near you in Knatts Valley
Typical jobs here are in homes near Kemsing Down, among other places. The nearest railway station is Kemsing station, roughly 2.5 miles south. A little further out are Sevenoaks Hospital (3.9 miles south-west) and Kemsing Castle Bank (2 miles south-west).
Checking the roof from ground level
After heavy rain, check ceilings and the tops of walls for new stains. Take a photo and write down when you saw it, which helps when we look at the roof.
A DIY look is useful, but it isn’t a survey. You won’t see flashings, valleys or the backs of chimneys properly from ground level.
Prices for electronic leak detection in Knatts Valley
When we price a survey, we consider:
- How tall the building is and how easy the roof is to see
- The type of building, from a house to a block or an office
- Any need for thermal images or a drone flight
- How complicated the roof is, with its valleys, chimneys and parapets
What a survey costs comes down to the roof itself: its size, its height, how many sections it has and how safely it can be seen. We quote electronic leak detection for each roof, as the method and time depend on the roof.
Getting in touch
We’ll usually ask about:
- The property’s address and postcode
- What made you get in touch
- Dates you’re working to, such as exchange
- Pictures of the roof from a safe spot, if you have them
A quick phone call is normally the easiest start: call 07833 053749 or email us. The price is agreed before a date is set.
What we cannot see
To be straight with you, there are limits to any roof survey:
- Fixing the holes we find
- Some conductive membranes
- Water entering through details rather than the membrane
If in doubt, phone 07833 053749 or send us an email and we’ll suggest the right survey. The full list of what we check.
What this survey covers
- Green roofs
- Roof terraces and balconies
- Single-ply roofs
- Commercial flat roofs
- Liquid-applied waterproofing
- Flat roof membranes
Towns and villages near Knatts Valley
Other services in Knatts Valley
FAQs for Knatts Valley
Is my home in Knatts Valley listed or in a conservation area?
The council and Historic England’s list are the places to check. Either can affect what roof work is allowed, so it is worth checking before planning any.
Is Knatts Valley within the area you cover?
Yes, smaller places are covered as well as towns. We cover the whole of London and South East England. Just mention lanes, gates or anything else about the route when booking.
Do you use low-voltage or high-voltage testing?
The roof decides the method. We’ll explain why when we quote.
What if it rains on the day?
It can, depending on the survey. Drones can’t fly safely in high wind or heavy rain, and thermal imaging works best with a dry roof, little wind and a sunny day beforehand. If the conditions are not right, we will talk to you about another date.
How do I arrange electronic leak detection in Knatts Valley?
Simply ring 07833 053749 or email us. We will ask a few questions, confirm the price and agree a date.
Are you insured?
Every survey is covered by professional indemnity and public liability insurance.
Can you tell me if my roof has asbestos?
No. Our report may flag materials that could contain asbestos, but confirming it is a job for a specialist asbestos surveyor. Buildings built or refurbished before 2000 may contain it.
Signs you need electronic leak detection in Knatts Valley
Flat roof membranes can be punctured by foot traffic, dropped tools or debris. Many are tiny but water still finds them.
We are often asked to look at:
- Punctures from foot traffic or tools
- Breaches hidden under paving or planting
- Stains far from any visible defect
- Holes around roof penetrations
Landlords with a home close to Kemsing station may find that flat roofs on let property tend to be checked only when they fail, which is the costly way round.
Before you book any roof surveyor
- Whether the roof space is looked at, where there is one
- How long the report takes to arrive
- Whether the price includes VAT
- Will the report include photos?
Roof by roof
EPDM rubber roofs
Some EPDM membranes conduct electricity, which can rule out some methods. We’ll tell you if yours isn’t suitable.
Bituminous membranes
Bituminous roofs often have laps and old repairs that can leak. We test where the roof suits it.
What we do, step by step
There is not much for you to do on the day. Point out anything you’ve noticed, such as stains, drips or loose pieces, and we’ll get on with the inspection. The survey itself takes more time on a big roof than a small one, and the build-up of the roof makes a difference too. Somewhere like Knatts Valley needs a little journey planning: let us know about lanes, gates and parking. On the day, we inspect everything that’s safely in view, inside and out.
- You let us know about the roof and where water is showing.
- The roof is assessed for suitability first.
- We choose a low-voltage or high-voltage method to match the roof.
- The membrane is tested and breaches are found.
- You get a report with photos of each breach.
How to prepare
- Check we can get to the back of the property
- For flats, check roof access has been agreed
- Jot down any questions you want answered
Getting a price
To book a survey, phone 07833 053749 or drop us an email and tell us the address and what’s prompted the survey. You will know the price before anything is booked.