Hertfordshire · London and the South East
Electronic Leak Detection in Tonwell
Get a clear view of the flat roof membrane at a property in Tonwell. We visit on weekdays and at weekends.
- Gaps at membrane joints
- Leaks at pipes, outlets or fixings
- Water coming in under a flat roof
How electronic leak detection works in Tonwell
Electronic testing locates holes in the waterproofing, not every cause of water getting in. Water coming through walls, copings, rooflights or plumbing won’t show on the test. We will tell you if we think the leak is coming from somewhere else. It won’t show water getting in through brickwork or around frames. Our report keeps that distinction clear. We’ll point you to the likely next step. We survey roof terraces and balconies, liquid-applied waterproofing and single-ply roofs, and common reasons people get in touch are patched roofs that still leak and new roofs to check before paving or planting.
Older buildings in small places like Tonwell may be listed or in a conservation area, which can shape what a new flat roof may look like. 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.
What you get is a clear record of the flat roof membrane on the day we saw it. That makes it useful now and a handy reference later, such as when you want to compare after future work.
- Place
- Tonwell (SG12)
- Region
- Hertfordshire
- Cost
- Quoted for your roof
- Report
- Emailed report with photos and recommendations
- When we survey
- Weekdays, Saturdays and Sundays
- Insured
- PI and public liability insurance
- Telephone
- 07833 053749
- Last updated
- 27 October 2026
What we look for on each type of roof
Green and ballasted roofs
Roofs with planting or ballast hide the membrane. Some methods can work through these layers, depending on the build-up.
Single-ply membranes
Some single-ply membranes suit electronic testing well but it depends on the product and layers.
Common questions in Tonwell
Do you carry out roof surveys in Tonwell?
Yes, Tonwell is within the area we cover. We cover the whole of London and South East England. You can ring 07833 053749 or drop us an email with the address and a few details.
Does a conservation area affect roof work in Tonwell?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. Listed building consent is needed for changes that affect a listed building’s special interest, and conservation areas can limit changes of roofing material.
Can you test a green or ballasted roof?
Sometimes. It depends on the build-up and the layers above the membrane, and some may need lifting. We’ll discuss it before we quote.
Are you structural engineers?
No. We are experienced roof surveyors, and visible signs such as sagging are noted, but we don’t provide calculations or an engineer’s opinion. The report will say if you need an engineer.
Which method do you use?
The roof decides the method. We will explain why when we quote.
What does the report include?
You get our findings in writing, part by part, with photos, and ends with what we recommend. Points are put by urgency where it matters.
Do I need to be at home?
If the survey includes the loft or the inside of the building, someone needs to let us in. Access is agreed with you as you book.
Nearby places to Tonwell
Other services in Tonwell
What we cannot see
We only report everything that’s safely in view on the day, so some things are outside what a survey can do:
- Build-ups without a suitable layer below
- Moisture spread under the membrane
- Repairing the breaches (that is for your roofer)
Not sure which survey suits your roof? You can call 07833 053749 or use the contact form and we will tell you. What a survey covers and does not.
What we check
- Commercial flat roofs
- Roof terraces and balconies
- Flat roof membranes
- Liquid-applied waterproofing
- Single-ply roofs
- Green roofs
Why act early in Tonwell
Not every leak is in the membrane. Testing shows whether the membrane is breached, so other causes can be checked. Outbuildings and barns around Tonwell are easy to forget, but a failed roof there can spoil what’s stored inside. A quick look before winter can save a lot.
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. Electronic leak detection is quoted for your roof, because the method depends on the roof.
Why us?
- 20+ years’ experience
- Thermal imaging and drone inspection where they help
- An independent view of the roof
- We hold a CAA Flyer ID and Operator ID
Take a look at how roof surveys are priced or two real surveys.
The survey, step by step
The visit normally starts outside and finishes in the loft: outside views come first, then the roof space if there is safe access. 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 Tonwell, older homes can have small or awkward roof spaces, so it helps to know whether there’s a loft hatch and how easy it is to reach. Only areas that can be reached safely are inspected.
- We ask about the roof, its age, its membrane and where leaks appear inside.
- We check that the membrane and build-up suit electronic leak detection.
- We pick the low-voltage or high-voltage method that suits the roof.
- The roof is tested and any breaches are located.
- We send a report with photos of each breach so your roofer can repair it.
Before we arrive
- Have any questions written down, so nothing gets missed
- Show us where any leaks or stains appear
- Find any records of previous roof work
Getting a price
Booking is simple: just phone 07833 053749 or email us and give us a few details about the property and we will recommend the right survey. The price is agreed up front.
Related advice
What we are asked to look at in Tonwell
Joints and laps in a membrane can fail over time. A gap that’s hard to see can let water in for months before it shows.
Here are some of the things we see often:
- Leaks at pipes, outlets or fixings
- Leaks showing away from the breach
- Repairs that haven’t stopped the leak
- Gaps at membrane joints
For landlords with property near Ware station, flat roofs on let property tend to be checked only when they fail, which is the costly way round.
Choosing a roof surveyor
- How much experience they have with roofs like yours
- Whether the inside of the roof is included
- Whether the price includes VAT
- Will the report include photos?
What electronic leak detection looks like in Tonwell
Across the South East, older homes tend to have slate or clay tiles, and many later ones concrete tiles, and flat-roofed additions turn up almost everywhere. Flat roofs on extensions, dormers, garages and business units are found alongside them almost everywhere. The wider area around Tonwell has a long history of building, with Aston Bury about 4.6 miles north-west. On older houses around here, roofs often carry the marks of earlier repairs, from replaced slates to new lead.
If you look after a building like Tonwell St Mary's Church of England Primary School, schools and public buildings often have big flat roofs, and their outlets and upstands need regular checks.
Tonwell is about 2 miles north-west of Ware, in Hertfordshire. In Tonwell, as across Hertfordshire, every roof gets the same careful survey. Tonwell is one of the places in Hertfordshire where we work. Our London page covers surveys nearby.
Electronic leak detection in SG12 work the same way as everywhere else we cover. We offer electronic leak detection to properties on Ware Road, Temple Lane and Bourne Honour and the roads around them. If you are just outside Tonwell, we cover Chapmore End (1 mile south), Sacombe (1 mile north), Thundridge (2 miles east), Wadesmill (2 miles east) and Sacombe Green (2 miles north). Further out, we also cover Stevenage (7 miles north-west), St Albans (13 miles south-west), Bishop's Stortford (10 miles east), Welwyn Garden City (6 miles south-west), Harpenden (12 miles west) and Hitchin (12 miles north-west).
Local landmarks in Tonwell
Locally, jobs take us to homes and businesses close to Robin Hood & Little John pub and Chauncy School. The nearest railway station is Ware station, roughly 2.5 miles south-east. Well-known places in the area include Hertford County Hospital (3 miles south) and Barrowfield (2.7 miles south). Green spaces nearby include King's Meads.
Tips from our surveys
These tips come from what we see on roofs every week, before and after a survey:
- Have roof specifications to hand
- Check new waterproofing before handover
- Do not keep patching the same spot
- Limit access to the roof
If we think the leak isn’t coming through the membrane, the report says so, so other causes can be checked.
Limit foot traffic on flat roofs. Many breaches come from foot traffic.