Hertfordshire · London and the South East
Electronic Leak Detection in North Mymms
Electronic leak detection to pinpoint holes in flat roof membranes in North Mymms, using drones and thermal imaging where applicable. Get in touch for a price.
- Leaks under green or ballasted roofs
- Repairs that haven’t stopped the leak
- Failed seams and laps
Leave it or get it looked at?
Repairs in the wrong place leave the leak in place. ELD shows the actual breach points. In a place like North Mymms, a barn or garage roof left to fail puts whatever is inside at risk. It’s worth including them in a survey before a winter does the damage.
Bigger, taller and commercial roofs take more time to survey, so the price reflects that. The price is confirmed before you book.
Why us?
- More than 20 years surveying roofs
- Thermal imaging and drones used where they help
- Satisfaction rate of 98%
- An independent view of the roof
Read our cost guide or our case studies.
Electronic leak detection for homes and businesses in North Mymms
ELD can be carried out in more than one way. Low-voltage methods normally need a wet roof surface, while high-voltage testing needs a dry, exposed membrane. The right method depends on the membrane and the build-up of the roof, and we will explain our choice. If neither method suits your roof, we will tell you at the outset. Common reasons to book are leaks at pipes, outlets or fixings and water coming in under a flat roof, on commercial flat roofs, liquid-applied waterproofing and green roofs.
In a village or hamlet like North Mymms, flat roofs are normally on extensions, garages, outbuildings or barn conversions. The checks are the same as anywhere: the covering, the edges, the upstands and where water drains away. The journey and access are planned beforehand. If there are outbuildings or garages with flat roofs, mention them when you book.
The report doesn’t just list problems. For each finding, it explains what it is, why it matters and what we’d recommend.
- Place
- North Mymms (AL9)
- Wider area
- Hertfordshire
- Cost
- Quoted for your roof
- Report
- Written, with photos, emailed to you
- When we survey
- Weekdays and weekends
- Insurance
- PI and public liability insurance
- Phone
- 07833 053749
- Updated
- 27 October 2026
Nearby places to North Mymms
What else we do in North Mymms
Electronic leak detection in North Mymms: local notes
Wyllyotts Manor, about 2 miles south-east, is one of the historic houses in the wider area around North Mymms. Older homes in the wider area often have features worth a closer look, like lead valleys, tall stacks and roofs that have been patched over the years, and any change of roofing material on a listed home needs checking with the council first. Older houses in the South East frequently have slate or clay tile roofs, while many later estates have concrete tiles. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere.
If you own a rental within reach of Brookmans Park station, flat roofs over rear additions and dormers in rented property are worth checking between tenancies. For an older house near a landmark such as Church of St Mary the Virgin, any flat roof added at the back or on a dormer is likely to be far younger, and less durable, than the main roof. Anyone responsible for a site like Brookmans Park Primary School will know that a large flat roof with plenty of outlets and rooflights has many places where a membrane can fail.
North Mymms is about 2 miles north-west of Potters Bar, in Hertfordshire. Roofs in North Mymms get the same thorough look as anywhere else in Hertfordshire. Across Hertfordshire, we cover North Mymms. There is also a page for London.
Postcode districts we cover here for electronic leak detection: AL9. If you need electronic leak detection at a property on St Mary's Church Road, Abdale Lane and Warrengate Road or anywhere close by, we can survey it. We also cover the places around North Mymms: Welham Green (1 mile north), Colney Heath (2 miles north-west), Sleapshyde (3 miles north-west), Hatfield (3 miles north) and Shenleybury (3 miles west). Larger places within reach include Watford (9 miles south-west), Hemel Hempstead (11 miles west), Stevenage (13 miles north), St Albans (5 miles north-west), Welwyn Garden City (6 miles north) and Harpenden (9 miles north-west).
What’s near North Mymms
We work in homes and buildings around Chancellor's School, North Mimms Park and The Old Maypole Public House, among other places. For rail, the closest station is Brookmans Park station, about 0.7 miles east of the centre. Well-known places in the area include Shenley Hospital (3.5 miles south-west) and Potters Bar Museum (2 miles south-east). The countryside around North Mymms includes Furzefield Wood and Lower Halfpenny.
What happens on the day
On the day, we begin with a quick chat about the roof and anything that is worrying you. We then inspect everything that can be seen safely, from the ground, from windows, in the roof space and by drone where it applies. Most surveys take as long as needed for the membrane area and the build-up, which we set out in the quote. In a hamlet or village like North Mymms, a postcode doesn’t always lead to the right gate, so a few directions are welcome. After that, the survey runs as it would anywhere.
- We start by finding out what the roof is made of and where it leaks.
- 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.
- The breaches are recorded with photographs in a report for your roofer.
Preparing for the visit
- Check pets are kept safely away
- Have any questions written down, so nothing gets missed
- Check we can get to the back of the property
Arrange a survey
To get a price for electronic leak detection in North Mymms, ring 07833 053749 or email us. The address, the type of property and what you need to know help us price the survey accurately.
Related advice
FAQs for North Mymms
Is my home in North Mymms listed or in a conservation area?
Check Historic England’s online list first, then ask the council about conservation areas and any Article 4 direction. The answer matters most when a change of material is on the cards.
Is North Mymms in the area you cover?
We do. The survey and report are the same in North Mymms as anywhere else.
Is my roof suitable for ELD?
That depends on the roof’s membrane and layers. Let us know what you know about the roof and we’ll confirm suitability.
Is it a structural engineer’s report?
No. Visible signs such as deflection or sagging are recorded, but we do not provide calculations or an engineer’s opinion. The report will say if you need an engineer.
What happens after the survey?
You receive the written report by email, with photographs and recommendations. It’s yours to share with a seller, insurer, roofer or managing agent, whichever applies.
Do you use drones?
Where it helps and the rules allow, yes. Our sub-250g drone is flown by a CAA-registered operator with a Flyer ID and Operator ID, and every flight depends on the airspace and the weather.
How long will testing take?
It depends on the size of the roof and its build-up. You’ll know roughly how long before we start.
What a survey costs
Not every roof costs the same to survey, for these reasons:
- Building height and the viewpoints available
- Features like valleys, chimneys, dormers and parapets
- The roof’s overall size
- Whether it’s a home or a commercial building
To find out what your survey will cost, ring 07833 053749 or drop us an email with the address and a few details. The price is agreed before a date is set.
What to tell us when you contact us
Before you get in touch, it helps to have:
- Access details, such as a loft hatch or a shared roof
- The reason for the survey, such as buying, a leak or storm damage
- What kind of property and roof it is
- When you need the report by
To arrange a survey, call 07833 053749 or drop us an email and let us know the address and what’s prompted the survey. You will know the price before anything is booked.
Rented homes, blocks and businesses
Managing agents and residents’ management companies use roof surveys to plan maintenance. The report sets out what needs attention now and what can wait, which helps when budgeting.
Freeholders and residents’ companies use a roof report to plan and budget.
What you can safely check yourself
Keep a simple record: dates of leaks, photos from the ground and any work done on the roof. Share it with us when you book, as it helps us focus the survey.
Look up at the roof after a storm, from the ground: 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.
Roof by roof
Green and ballasted roofs
ELD is easier on a new roof before it is covered.
EPDM rubber roofs
EPDM rubber roofs often last 30–50 years, but punctures and seam failures still happen.