Hertfordshire · London and the South East
Electronic Leak Detection in Welham Green
Get a clear view of the flat roof membrane at a property in Welham Green from an independent roof surveyor. We visit on weekdays and at weekends.
- A flat roof leak that cannot be traced
- Leaks through a covered membrane
- Damage from equipment installers
Flat and commercial roofs around Welham Green
Hatfield House, about 1.8 miles north, is one of the historic houses in the wider area around Welham Green. Period homes nearby can have lead valleys, tall chimneys and a patchwork of past repairs, and a listed home or one in a conservation area may need consent for changes of material. Across the South East, older homes tend to have slate or clay tiles, and many later ones concrete tiles, with flat-roofed extensions, dormers and garages common everywhere. 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 Welham Green station, flat roofs on let property tend to be checked only when they fail, which is the costly way round. If you live in an older home near Church of St Mary the Virgin, flat-roofed rear additions and dormers added over the years are worth checking.
Welham Green is about 2 miles south of Hatfield, in Hertfordshire. We carry out electronic leak detection for homes and businesses in Welham Green and the surrounding area. Welham Green is one of the places in Hertfordshire we cover for electronic leak detection. For surveys nearby, see our London page.
We cover every part of the AL9 and AL10 postcode area for electronic leak detection. Whether your property is on Station Road, Old Farmhouse Mews and Vincenzo Close or anywhere close by, we can help. We also cover the places around Welham Green: North Mymms (1 mile south), Colney Heath (1 mile west), Hatfield (2 miles north), Sleapshyde (2 miles west) and Smallford (3 miles north-west). Further out, we also cover Watford (9 miles south-west), Hemel Hempstead (10 miles west), Stevenage (12 miles north), St Albans (5 miles west), Welwyn Garden City (4 miles north) and Harpenden (8 miles north-west).
Landmarks near Welham Green
In Welham Green, that means homes and buildings near Brookmans Park, The Hope and Anchor Public House and Chancellor's School and the streets around them. There is a railway station in Welham Green itself: Welham Green station. Nearby you’ll also find Queen Elizabeth II Hospital (3.5 miles north) and The Bunker at Hatfield Police Station (2.3 miles north). Not far away are Gobions Wood.
Electronic leak detection for homes and businesses in Welham Green
Electronic leak detection works on many flat roof membranes over offices, units, blocks of flats and homes. It helps trace a leak you already have or to test a new membrane before it’s covered. Each roof is quoted on its size and build-up. We can test on weekdays and at weekends when conditions allow. Just ask about your roof. We survey single-ply roofs, liquid-applied waterproofing and commercial flat roofs, and common reasons people get in touch are breaches around outlets and penetrations and leaks through a flat roof with no obvious cause.
Around a smaller place like Welham Green, flat roofs usually cover extensions, garages and dormers. Even a small flat roof can let lots of water into the room below. Knowing the covering and how it was laid tells you what to expect from it, from felt and asphalt to EPDM rubber and GRP. Ponding, splits and lifting edges are the signs to look for from a window.
Where we cannot see part of the flat roof membrane, the report says so. You will know exactly what was inspected and what wasn’t.
- Location
- Welham Green (AL9, AL10)
- Wider area
- Hertfordshire
- Price
- Quoted for your roof
- Your report
- Emailed report with photos and recommendations
- Survey days
- Monday to Sunday, daytime
- Insurance
- Professional indemnity and public liability
- Phone
- 07833 053749
- Page updated
- 27 October 2026
Checking the roof from ground level
The one thing to avoid is getting up close. Slates, tiles, flat roofs and rooflights can give way, and falls from height are serious. That is where a survey comes in, using safe viewpoints and a drone where applicable.
Inside, the loft is a good place to look, with care. Use a torch and stay on the joists or boards, and look for staining, damp timber or daylight coming through.
Tips that help
A few practical points come up again and again on our surveys. They’re worth knowing whatever the roof:
- Consider ELD before paving or planting goes on
- Tell us about the membrane and build-up if you know it
- Avoid repeated repairs without finding the cause
- Get leaks traced quickly
Where the evidence points to walls, copings or rooflights, we’ll note it, with a suggestion of what to check next.
Keep people off the flat roof unless they need to be there. Feet and dropped tools are a common cause of holes.
Nearby places to Welham Green
More services for Welham Green
How it works
We don’t take risks to get a closer look. We inspect what can be seen safely, and anything we can’t see is noted in the report. Most visits take as long as needed for the membrane area and the build-up, which we set out in the quote. Some parts of a survey depend on the weather, so a visit to Welham Green is booked with the forecast in mind: drone flights and thermal imaging need the right conditions, while a look from the ground and the loft can go ahead in most weather.
- We ask about the roof, its age, its membrane and where leaks appear inside.
- We confirm whether the roof is suitable for electronic testing.
- We pick the low-voltage or high-voltage method that suits the roof.
- Testing runs across the roof to locate breaches in the membrane.
- We send a report with photos of each breach so your roofer can repair it.
Before we arrive
- Have keys ready for side gates, garages or roof access doors
- Tell us about any leaks, stains or damp patches you know of
- If it is not your property yet, arrange access through the agent
Getting a price
Getting a price is simple: just call 07833 053749 or send us an email and give us some details about the property and we’ll suggest the right survey. The price is agreed up front.
Related advice
Questions from Welham Green
Should a flat-roofed garage or porch in Welham Green be checked too?
Often, yes, so mention it when booking. Many homes in new towns like Hatfield have flat-roofed garages and porches, and felt roofs often last around 15–20 years.
Do you cover smaller places like Welham Green?
Yes, we do. We survey roofs across London and the South East, from towns to the smallest villages. The journey is planned ahead, so it’s useful to know about access.
I live in a flat. Can you survey the roof?
Yes. A shared roof needs access agreed first. Tell us about it when booking and we will explain what’s needed.
Can you survey at the weekend?
Surveys can be booked for any day of the week: weekdays, Saturdays and Sundays. Just tell us the days that suit you.
How quickly is the report sent?
It depends on the package: the Basic Survey report arrives within 48 hours, the Standard Survey in 24 to 48 hours and the Premium Survey the same day. The report is emailed to you.
What insurance do you have?
Every survey is covered by professional indemnity and public liability insurance.
What does the report include?
It explains what we saw, what it means and what we’d suggest, backed by photos. It also says if any part of the roof couldn’t be seen safely.
What affects the cost of electronic leak detection
We confirm the exact price before you book. This is what makes a difference:
- Whether thermal imaging or a drone is needed
- Building height and the viewpoints available
- Extensions, dormers and garages with roofs of their own
- The roof’s overall size
What a survey costs comes down to the roof itself: how big it is, how high it is, the number of separate roofs and how safely it can be seen. We quote electronic leak detection for each roof, as the method and time depend on the roof.
Helping us price your survey
A little information up front helps. Please include:
- What made you get in touch
- Whether there’s a loft hatch, a shared roof or tricky access
- Your postcode, so we can check access and travel
- Any marks or damp showing indoors
Our phone lines are open seven days a week, including Saturdays and Sundays. To book or ask a question, ring 07833 053749 or send us an email.
When to book a survey in Welham Green
Water travels under flat roof membranes. The leak may show some distance from where water gets in which makes it hard to find by looking.
A survey makes sense if you’ve noticed:
- Holes left by work on the roof
- Repairs that haven’t stopped the leak
- Leaks through a flat roof with no obvious cause
- Breaches hidden under paving or planting
For site and facilities teams at buildings such as St Mary's Church of England Primary School, ponding and blocked outlets on a wide flat roof are worth catching before the next wet season.
Choosing a roof surveyor
- Whether any drone flown is registered with the CAA
- How soon the report will arrive
- Their insurance cover
- What follow-up you get after the report
Leave it or get it looked at?
Not every leak is in the membrane. Testing shows whether the membrane is breached, so other causes can be checked. In an older home around Welham Green, water from a roof defect can get into timber and plaster, which is far harder to put right than the roof fault itself.
Bigger, taller and commercial roofs take more time to survey, so they’re priced to match. The price is confirmed before you book.
Why book with us
- An independent view of the roof
- 98% of customers satisfied
- Thermal imaging and drones used where they help
- Every finding written up with photos
Read what a roof survey costs and what we found on two real jobs.