Hertfordshire · London and the South East
Knebworth Electronic Leak Detection
Electronic leak detection for homes and businesses in Knebworth. We have completed more than 5,000 surveys across London and South East England.
- Patched roofs that still leak
- Leaks at pipes, outlets or fixings
- Waterproofing to test before it’s covered
About our electronic leak detection in Knebworth
Our ELD report shows where each breach was found with photos. Your roofer can then repair those points instead of hunting for the leak. We do not estimate repair costs; that’s for your roofer to price. A retest after repairs can check the work if the build-up allows. You get a written report with photos. If you are worried about punctures from foot traffic or tools and leaks through a covered membrane, we can find out what’s behind it, whatever the roof.
Around a smaller place like Knebworth, flat roofs usually cover extensions, garages and dormers. Even a small flat roof can let plenty of water into the room below. What it is 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.
The report doesn’t just list problems. It explains what we found, why it matters and what we recommend, so you can plan your next steps.
- Location
- Knebworth (SG3)
- Region
- Hertfordshire
- Price
- Quoted for your roof
- Reports
- A written report with photos, by email
- Survey days
- Monday to Sunday, daytime
- Insurance
- PI and public liability insurance
- Call
- 07833 053749
- Page updated
- 27 October 2026
Signs you need electronic leak detection in Knebworth
On a flat roof, water spreads under the waterproofing. The stain inside can be far from the hole which makes it hard to find by looking.
A survey makes sense if you’ve noticed:
- Leaks that return after repairs
- A flat roof leak that can’t be traced
- New roofs to check before paving or planting
- Leaking laps in the waterproofing
Landlords with a home close to Knebworth station may find that flat roofs on let property tend to be checked only when they fail, which is the costly way round.
What to check before booking
- What exactly goes into their report
- Whether the inside of the roof is included
- Which limits apply to the survey
- How they plan to inspect the roof safely
How we price electronic leak detection
Prices vary from roof to roof, and it comes down to:
- The roof’s overall size
- How tall the building is and how easy the roof is to see
- Extensions, dormers and garages with roofs of their own
- The type of building, from a house to a block or an office
To find out what your survey will cost, ring 07833 053749 or send us an email with the address and a few details. The price is agreed before a date is set.
What we need to know
When you call or email, these details help:
- The reason for the survey, such as buying, a leak or storm damage
- The property’s address and postcode
- What kind of property and roof it is
- Access details, like a loft hatch or a shared roof
You can call us seven days a week, including Saturdays and Sundays. To book or ask a question, call 07833 053749 or drop us an email.
Why it is worth a survey now in Knebworth
Opening up a roof to hunt for a leak is disruptive. ELD aims to locate the breach first, so the repair can be targeted. Arranging work in a smaller place like Knebworth is easier with notice than in an emergency. A survey gives you that notice.
Every price we give includes VAT. We quote electronic leak detection for each roof, as the method and time depend on the roof. You will know the exact price before you book.
Why book us in Knebworth
- Thermal imaging and drone inspection where they help
- Drone flown under a CAA Flyer ID and Operator ID
- Covered by professional indemnity and public liability insurance
- Visits on any day of the week
Read how roof surveys are priced and two real surveys.
Places near Knebworth
What else we do in Knebworth
Knebworth: your questions answered
Do you cover Knebworth?
We do. The survey and report are the same in Knebworth as anywhere else, and visits run on weekdays and weekends.
Will you come out to Knebworth?
Yes. Knebworth is within the area we cover, which takes in towns, villages and rural addresses. Our area covers London and South East England. Let us know about access, parking and anything unusual about getting there when you book.
How long will testing take?
It typically takes longer on a large roof than a small one, and the build-up of the roof makes a difference too.
Can you test a green or ballasted roof?
Sometimes. The layers on top and the build-up below decide it, and some may need lifting. We talk this through first.
When does the report arrive?
Report times are set by the package. Basic is within 48 hours, Standard is 24–48 hours and Premium is the same day. Mention any deadline when booking.
I live in a flat. Can you survey the roof?
Yes, if the freeholder or managing agent agrees access. We look at the parts we are given access to.
How experienced are you?
We have completed more than 5,000 surveys, across 20+ years of surveying roofs, with 98% customer satisfaction.
How it works
A survey visit follows a simple order: we hear what you’ve seen, inspect the roof from each safe vantage point, take photos as we go and make notes for the report. It normally takes a time that depends on the membrane area and the build-up, which we’ll explain when we quote. In a smaller place like Knebworth, parking is seldom the issue; lanes, gates and long drives are worth mentioning. On bungalows and lower roofs, much can be seen from ground level, with the loft showing the underside.
- 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.
- We test the roof and locate any breaches.
- A report with photos shows where each breach is.
Preparing for the visit
- Let us know about parking near the property
- Move anything stored under the loft hatch
- Keep pets inside or away from the areas we are looking at
Booking a survey
Every survey is priced before it’s booked, so you know where you stand. Electronic leak detection is quoted for your roof, because the method depends on the roof. To book, ring 07833 053749 or send us an email.
Advice
Different roofs, different checks
Green and ballasted roofs
Parts of the covering may have to come up. We explain what’s needed when we quote.
Inverted and paved roofs
A terrace or paved roof hides the waterproofing. Whether it can be tested depends on the build-up.
DIY checks: what’s safe
A lot can be seen from the ground. Binoculars help you spot slipped slates or tiles, gaps along the ridge and a leaning stack. Never climb onto the roof to look.
If you have a loft with safe access, take a look inside. Use a torch and stay on the joists or boards, checking for stains, damp wood or chinks of daylight.
Electronic leak detection in Knebworth: local notes
Older houses in the South East often have slate or clay tile roofs, while many later estates have concrete tiles, with flat-roofed extensions, dormers and garages common everywhere. Next to the main roofs there is typically a flat roof somewhere, whether on an extension, a garage or a commercial unit. About 1.3 miles north-west lies Knebworth House, a reminder of how long the area around Knebworth has been built on. On older houses around here, roofs frequently 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.
If you live in an older home near Church of St Martin, later flat-roofed additions are common on older houses, and their edges and upstands frequently show the first signs of wear. If you look after a building like Knebworth Primary and Nursery School, a large flat roof with lots of outlets and rooflights has many places where a membrane can fail.
Knebworth is about 3 miles south of Stevenage, in Hertfordshire. We cover Knebworth and the rest of Hertfordshire. Knebworth is one of the towns and villages in Hertfordshire we cover for electronic leak detection. Our London page covers surveys nearby.
All of SG3 is covered for electronic leak detection. Whether your property is on London Road, Deanscroft and Lytton Fields or a nearby road, we can help. If you are just outside Knebworth, we cover Woolmer Green (1 mile south), Bragbury End (1 mile north-east), Oaklands (2 miles south), Datchworth (2 miles south-east) and Shephall (2 miles north). Larger places within reach include Hemel Hempstead (14 miles south-west), Stevenage (3 miles north), St Albans (10 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (5 miles south) and Harpenden (8 miles south-west).
Local landmarks in Knebworth
Locally, jobs take us to homes and businesses close to Barnwell School and Knebworth Park. There’s a railway station in Knebworth itself: Knebworth station. Other landmarks nearby include Benington Castle (3.6 miles north-east) and Datchworth Museum (1.7 miles south-east). The countryside around Knebworth includes Mardley Heath.