Hertfordshire · London and the South East
Colney Heath Electronic Leak Detection
Electronic leak detection to pinpoint holes in flat roof membranes in Colney Heath, with drones and thermal imaging where they help. Get in touch for a price.
- Leaks that return after repairs
- New membranes needing a check before handover
- Breaches around outlets and penetrations
What happens on the day
Time on site depends on the size and shape of the roof; as a rough guide, the survey takes a time that depends on the size of the roof and how it’s built, and we’ll give you a guide when quoting. If you have questions on the day, just ask. Cottages and farmhouses around Colney Heath often have roofs at several levels, with lean-tos and outbuildings attached. We work round each section in turn, from the safest viewpoints, and anything we can’t see is noted.
- You tell us 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.
- You get a report with photos of each breach.
Before we arrive
- For flats, check roof access has been agreed
- Leave a clear route to the loft
- Have keys ready for side gates, garages or roof access doors
Arrange a survey
A quick phone call is typically the easiest start: ring 07833 053749 or use the contact form, and we will ask about the building and what you need. You will have a price before anything is arranged.
Advice
How electronic leak detection works in Colney Heath
A leak in a flat roof often shows up a long way from where the water gets in. So the stain inside rarely sits under the hole. Electronic leak detection tests the membrane itself and locates the breach. It is testing only, and the repair is for your roofer. On a suitable roof, it takes the guesswork out of finding the hole. We then send you the results in a written report. If you’re worried about holes around roof penetrations and damage from equipment installers, we can find out what’s behind it.
In a village or hamlet like Colney Heath, flat roofs are typically on extensions, garages, outbuildings or barn conversions. They need the same care as any town roof: outlets, upstands, edges and the covering itself. The journey and access are planned beforehand. Garages and outbuildings are easy to forget, so mention any you want included when you book.
It is not only a list of defects. For each finding, it explains what it is, why it matters and what we’d recommend, so you can plan your next steps.
- Where
- Colney Heath (AL4)
- Region
- Hertfordshire
- Prices
- Quoted for your roof
- Reports
- A written report with photos, by email
- Appointments
- Weekdays and weekends
- Cover
- PI and public liability insurance
- Telephone
- 07833 053749
- Updated
- 27 October 2026
Places near Colney Heath
Also in Colney Heath
Tips that help
A few practical points come up again and again on our surveys. They’re worth knowing whatever the roof:
- Ask contractors to protect the membrane
- Note where leaks show inside and when
- Stay off the flat roof unless needed
- Have roof specifications to hand
If water has been getting in, insulation under the membrane may be wet. That is something to discuss with your roofer and other checks can help judge it.
Don’t leave a flat roof leak running. The longer water gets in, the more insulation and decking can be affected.
Electronic leak detection in Colney Heath: local notes
The wider area around Colney Heath has a long history of building, with Hatfield House about 2.3 miles north-east. If your house is among the older ones, expect a mix of original materials and later repairs on the roof, and a listed home or one in a conservation area may need consent for changes of material. Slate and clay tile are the usual coverings on older South East houses, with concrete tiles on many later estates, and flat-roofed additions turn up almost everywhere. Mixed in with those pitched roofs are lots of flat ones, over rear extensions, dormers, garages and shops.
Anyone responsible for a site like Colney Heath Junior Mixed Infant and Nursery School will know that a large flat roof with a good many outlets and rooflights has many places where a membrane can fail. If you look after a shop, office or commercial unit, for instance near The Maltings, the flat roofs over shops and commercial units are worth checking before a leak, not after. Take an older house close to Church of St Mark: later flat-roofed additions are common on older houses, and their edges and upstands frequently show the first signs of wear.
Colney Heath is about 2 miles south-west of Hatfield, in Hertfordshire. Wherever you are in Colney Heath, we can carry out electronic leak detection at your property, on a weekday, Saturday or Sunday. Across Hertfordshire, we cover Colney Heath and the places around it. London is in our area too.
Here we cover the AL4 postcode area for electronic leak detection. Local streets include High Street, Fair View and Roestock Lane, and we cover them all. Neighbouring places we cover for electronic leak detection include Sleapshyde (1 mile north-west), Welham Green (1 mile east), Smallford (1 mile north-west), Hatfield (2 miles north-east) and Tyttenhanger (2 miles west). Larger places within reach include Watford (8 miles south-west), Hemel Hempstead (9 miles west), Stevenage (12 miles north), St Albans (3 miles west), Welwyn Garden City (5 miles north-east) and Harpenden (7 miles north-west).
Landmarks near Colney Heath
We work in homes and buildings around Chalkdrawers Arms, Bishop's Hatfield Girls' School and North Mimms Park, among other places. For rail, the closest station is Welham Green station, roughly 1.7 miles east of the centre. Nearby you’ll also find Hill End Hospital (2.3 miles west) and The Bunker at Hatfield Police Station (1.9 miles north). The countryside around Colney Heath includes Verulamium Lake and Colney Heath Local Nature Reserve.
What affects the price in Colney Heath
Prices always include VAT. The things that change the price are:
- The shape of the roof and its details
- Building height and the viewpoints available
- The roof’s overall size
- If the survey needs thermal imaging or a drone
Bigger, taller and commercial roofs take more time to survey, so the price reflects that. You’ll know the figure before booking.
What we need to know
Before you get in touch, it’s useful to have:
- How the loft is reached, if there is one
- Your timetable, like an exchange date
- Your postcode, so we can check access and travel
- The reason for the survey, such as buying, a leak or storm damage
Surveys can be booked for weekdays, Saturdays or Sundays. To find a date that works for you, call 07833 053749 or send us an email with the address and the days you’d prefer.
Questions from Colney Heath
Is my home in Colney Heath listed or in a conservation area?
Start with Historic England’s list for listing and your council for conservation areas. It’s worth checking before planning roof work, as both can affect what’s allowed.
Are flat-roofed garages and porches in Colney Heath worth including?
Usually, yes: tell us about it as you book so the visit can include it. Many homes in new towns like Hatfield have flat-roofed garages and porches, and felt roofs often last around 15–20 years.
Will I get photos?
Yes, plenty. Pictures sit next to the findings they show, which makes the report easy to follow.
Are you insured?
We hold professional indemnity and public liability insurance, for every survey we carry out.
How much time does ELD need?
Testing usually takes a length of time set by the membrane area and the build-up, which we’ll explain when we quote.
How many surveys have you done?
Over 20 years and more than 5,000 surveys, across London and South East England.
Is my roof suitable for ELD?
It depends on the membrane and the build-up. Share any details you have and we will confirm suitability.
Should I look at the roof myself first?
After strong wind, take a look from the pavement or garden: broken slates or tiles in the garden, gaps along the ridge or loose lead are signs to note. Don’t go up yourself.
It’s useful to keep a record: dates of leaks, photos from ground level and any work done on the roof. Send it with your enquiry and it will help the survey.
What electronic leak detection does not cover
It is useful to know what a survey won’t do before booking:
- Roofs whose membrane or build-up is not suitable
- Sections we can’t safely access
- Fixing the holes we find
If in doubt, phone 07833 053749 or email us and we’ll point you to the right survey before you book. What a survey covers and does not.
Roof types and parts we check
- Single-ply roofs
- Liquid-applied waterproofing
- Roof terraces and balconies
- Flat roof membranes
- Commercial flat roofs
- Green roofs
Rented homes, blocks and businesses
For blocks of flats, a roof survey helps managing agents and residents’ management companies plan ahead. The report sets out what needs attention now and what can wait, which helps when budgeting.
If the property is let, the agent or a tenant can let us in. Surveys run on weekdays, Saturdays and Sundays, which helps when tenants work during the week.