Kent · London and the South East
Electronic Leak Detection in Knockholt
Electronic leak detection in Knockholt, with over 20 years’ experience behind it. Every survey ends with a written report and photos.
- Leaks through a covered membrane
- Repairs that haven’t stopped the leak
- Leaks showing away from the breach
About our electronic leak detection in Knockholt
Not every flat roof suits electronic testing. Some membranes conduct electricity themselves, and some build-ups lack the layer the test needs below the membrane. We’ll say if ELD will not work on your roof at the start. Telling us what you know about the roof’s membrane and layers helps, including drawings, specifications or the roofer’s paperwork. It avoids arranging a test that cannot give results. Common reasons to book are failed seams and laps and holes left by work on the roof, across roof terraces and balconies, flat roof membranes and commercial flat roofs.
Older buildings in small places like Knockholt may be listed or in a conservation area, and that can affect how an extension roof or dormer is re-covered. Check with the council before planning any change of material. Finding out what state the roof is in gives you the facts to plan with. Listed building consent is needed for changes that affect a listed building’s special interest.
The report is written in plain words, so it makes sense without any roofing background. Photographs show what each point refers to, and recommendations are put by urgency where it matters.
- Where
- Knockholt (TN14)
- Wider area
- Kent
- Price
- Quoted for your roof
- Your report
- A written report with photos, by email
- Survey days
- Monday to Sunday, daytime
- Insurance
- Professional indemnity and public liability
- Phone
- 07833 053749
- Page updated
- 27 October 2026
Knockholt: your questions answered
Is Knockholt in the area you cover?
We do. The survey and report are the same in Knockholt as anywhere else, and visits run on weekdays and weekends.
Do you cover smaller places like Knockholt?
Yes, Knockholt is covered. Our area covers London and South East England, from towns to the smallest villages. The journey is planned ahead, so it helps to know about access.
What’s the best way to book?
Just call 07833 053749 or drop us an email with the address. After a few questions, we confirm the price and fix a day.
How is ELD priced?
Electronic leak detection is quoted for your roof, because the method depends on the roof. Size, build-up and access all affect the price. For a quote, phone 07833 053749 or email us.
How long have you been surveying roofs?
We’ve completed more than 5,000 surveys, across 20+ years of surveying roofs, with 98% customer satisfaction.
Does the weather affect the survey?
It depends on the weather and the survey. Strong wind or heavy rain can make access unsafe and ground a drone, and we’d agree another day.
Is my roof suitable for ELD?
ELD does not suit every roof. Some membranes conduct electricity, and some build-ups lack a suitable layer below. We will tell you if yours is not suitable before testing.
Common roof problems in Knockholt
Water travels under flat roof membranes. The leak may show some distance from where water gets in, so tracing it by eye is difficult.
Most people get in touch after spotting something like this:
- Breaches around outlets and penetrations
- New roofs to check before paving or planting
- Leaks through a covered membrane
- Damage from equipment installers
For landlords with property near Knockholt station, flat roofs over rear additions and dormers in rented property are worth checking between tenancies.
Questions to ask before booking
- Is VAT included in the price?
- What’s outside the scope of the survey
- Their track record with similar roofs
- Are they insured for the work?
Tips that help
Getting the most from electronic leak detection starts before we arrive and carries on afterwards. Some tips:
- Find the breach before more patching
- Get leaks traced quickly
- Keep foot traffic on flat roofs to a minimum
- Note where leaks show inside and when
Once repairs are made, the roof can be tested again if you want to check them, where the roof still suits the method.
Act on leaks quickly. Water under a membrane can spread.
How the survey works
The visit usually starts outside and finishes in the loft: first the slopes, edges and gutters from every safe viewpoint, then the roof space where it can be reached. In total, it takes more time on a big roof than a small one, and the build-up of the roof makes a difference too. Around Knockholt, older homes can have small or awkward roof spaces, so tell us about the loft hatch and any ladder. We only go where it’s safe.
- We ask about the roof, its age, its membrane and where leaks appear inside.
- The roof is assessed to see if electronic testing will work on it.
- We pick the low-voltage or high-voltage method that suits the roof.
- We test the membrane and find where current is passing through it.
- We send a report with photos of each breach so your roofer can repair it.
Preparing for the visit
- Show us where any leaks or stains appear
- Agree roof access with the managing agent if it is shared
- Have any questions written down, so nothing gets missed
Arrange a survey
Booking is simple: just call 07833 053749 or use the contact form, let us know about the property and we will explain which survey suits. The price is agreed up front.
Advice
What you can safely check yourself
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. Leave anything above ground level to a survey.
During heavy rain, look at the gutters from ground level or a window. Water spilling over the edge can be a sign of a blockage or a gutter that has dropped.
Also in Knockholt
What happens if roof problems are left?
ELD before paving, ballast or planting goes on is simpler. Once layers are added, finding a breach is harder. In a place like Knockholt, a barn or garage roof left to fail puts whatever is inside at risk. It is worth including them in a survey before a winter does the damage.
The cost of a survey depends on the roof: 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.
Why choose Independent Roof Survey in Knockholt
- Every finding written up with photos
- Insured for professional indemnity and public liability
- More than 20 years surveying roofs
- An independent view of the roof
Landlord and commercial surveys in Knockholt
With a portfolio of properties, you can book surveys for several addresses. To arrange surveys for several addresses, call 07833 053749 or send us an email.
We survey roofs for landlords and agents as well as householders. The report gives you a dated record of the flat roof membrane, with photos, useful for planning maintenance.
Electronic leak detection around Knockholt
The wider area around Knockholt has a long history of building, with Down House about 2.7 miles north-west. On older houses around here, roofs frequently carry the marks of earlier repairs, from replaced slates to new lead, and the council can say whether a home is in a conservation area. Older houses across Kent frequently have handmade clay or peg tiles, and many have tile-hung walls. You’ll also find oast houses and timber-framed Wealden hall houses among the county’s older buildings. Flat roofs on extensions, dormers, garages and business units are found alongside them almost everywhere.
Take an older house close to St Katharine's Church: any flat roof added at the back or on a dormer is likely to be far younger, and less durable, than the main roof.
Knockholt is about 4 miles north-west of Sevenoaks, in Kent. We carry out electronic leak detection for homeowners, landlords and businesses in Knockholt. Our area takes in places right across Kent. Our London page covers surveys nearby.
We work across the TN14 postcode area for electronic leak detection and the streets around it. That includes homes and businesses on Main Road and Blueberry Lane and the roads around them. Other places close to Knockholt include Knockholt Pound (1 mile north-east), Halstead (2 miles north-east), Sepham Heath (2 miles north-east), Pratt's Bottom (2 miles north) and Twitton (3 miles east). Larger places within reach include Dartford (11 miles north-east), Sevenoaks (4 miles south-east), Royal Tunbridge Wells (14 miles south-east), Gravesend (14 miles north-east), Tonbridge (11 miles south-east) and Northfleet (13 miles north-east).
Around Knockholt
Locally, jobs take us to homes and businesses close to The Three Horseshoes pub. For rail, the closest station is Knockholt station, about 2.7 miles north-east. Well-known places in the area include Orpington Hospital (3.6 miles north) and Otford Heritage Centre (3.9 miles east). Green spaces nearby include Betsom's Hill and Downe Bank.