Hertfordshire · London and the South East
Electronic Leak Detection in Tewin Wood
Find out what’s going on with the flat roof membrane before you decide what to do next. We carry out electronic leak detection in Tewin Wood.
- New membranes needing a check before handover
- Leaks showing away from the breach
- Leaks that return after repairs
Electronic leak detection in Tewin Wood: what you get
ELD can be carried out in more than one way. Low-voltage methods normally need a wet roof surface and high-voltage methods need the membrane dry and exposed. Which one suits depends on the membrane and the layers of the roof, and we’ll explain our choice. If neither method suits your roof, we will tell you before any testing starts. We’re frequently asked to look into punctures from foot traffic or tools and leaking laps in the waterproofing, on roof terraces and balconies, green roofs and liquid-applied waterproofing.
Flat roofs on exposed homes in small places like Tewin Wood take more wind and rain, which is hard on edges, upstands and joins in the covering. Older felt roofs, frequently around 15–20 years in life, show it first. EPDM rubber and GRP coverings last longer, but their edges and joints still need checking. Exposed edges are usually the first part of a flat roof to go.
The report records the flat roof membrane as we found it on the day. It’s useful straight away, and a good reference for later.
- Where
- Tewin Wood (AL6)
- Region
- Hertfordshire
- Prices
- Quoted for your roof
- Report
- Emailed report with photos and recommendations
- Appointments
- Weekdays and weekends
- Cover
- Professional indemnity and public liability
- Telephone
- 07833 053749
- Page updated
- 27 October 2026
The survey, step by step
Photographs are taken throughout the visit, so you can see in the report what we found and where. Close-ups come from the safest viewpoint available, including by drone where it’s applicable and the weather allows. Most surveys take more time on a big roof than a small one, and the build-up of the roof makes a difference too. Older roofs in small places like Tewin Wood can have low, tight loft spaces, so tell us about the loft hatch and any ladder. Only areas that can be reached safely are inspected.
- We start by finding out what the roof is made of and where it leaks.
- We check that the membrane and build-up suit electronic leak detection.
- The method depends on the membrane and what sits above and below it.
- Testing runs across the roof to locate breaches in the membrane.
- You get a report showing where each breach is, for your roofer to repair.
Before the survey
- Keep pets inside or away from the areas we are looking at
- If you are buying, check with the agent that we can get in
- Let us know about parking near the property
Getting a price
To book a survey, phone 07833 053749 or send us an email with the address and what you’d like to know about the roof. You will know the price before anything is booked.
Related advice
Checking the roof from ground level
The one thing to avoid is getting up close. Roofs are fragile and slippery, and a fall can be serious. That is where a survey comes in.
Keep a simple record: when leaks happen, ground-level photos and any past roof work. Share it with us as you book and it will help the survey.
Places near Tewin Wood
Other services in Tewin Wood
Prices for electronic leak detection in Tewin Wood
All our prices include VAT. What changes the price is:
- Roof area
- The type of building, from a house to a block or an office
- If the survey needs thermal imaging or a drone
- Extra roofs, like extensions, dormers or garages
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. We quote electronic leak detection for each roof, as the method and time depend on the roof.
Helping us price your survey
A few details help us recommend the right survey and price. When you contact us, it helps to mention:
- How the loft is reached, if there is one
- Any stains, drips or damp patches you’ve seen indoors
- Your postcode, so we can check access and travel
- Your timetable, such as an exchange date
If you have photos of the roof, send them over. Take them safely from ground level or a window; never climb up to get a better view. To get started, call 07833 053749 or use the contact form.
For landlords and managing agents
Buyers’ agents can book surveys on behalf of their clients. The report is emailed, so it can go straight to your client, photos included.
Letting agents often book on a landlord’s behalf, with the report sent to whoever needs it. We agree a time with the tenant beforehand.
What we look for on each type of roof
Inverted and paved roofs
We’ll tell you if your inverted or paved roof isn’t suitable.
Liquid-applied waterproofing
What lies under a liquid coating decides if ELD will work.
Tips from our surveys
Here are a few things we’d tell any owner, before and after a survey:
- Find the breach before more patching
- Check new waterproofing before handover
- Keep outlets clear of debris
- Use boards when working on the roof
You receive a report showing where each breach was found, with photographs. Pass it to your roofer to repair the breach points.
Clear flat roof outlets regularly. Water that sits on the roof finds breaches faster.
What electronic leak detection looks like in Tewin Wood
Digswell House, about 2.1 miles south-west, is one of the historic houses in the wider area around Tewin Wood. 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. In this part of the South East, older roofs are mostly slate or clay tile and many newer ones concrete tile, and flat-roofed additions turn up almost everywhere. Flat roofs on extensions, dormers, garages and business units are found alongside them almost everywhere.
For businesses in and around places like Howard Centre, outlets and upstands on commercial flat roofs are the places to check before trouble starts. If you look after a building such as Ridgeway Academy, ponding and blocked outlets on a wide flat roof are worth catching before the next wet season. For landlords with property near Welwyn North station, flat roofs over rear additions and dormers in rented property are worth checking between tenancies.
Tewin Wood is about 3 miles north-east of Welwyn Garden City, in Hertfordshire. We survey roofs in Tewin Wood and the rest of Hertfordshire, as part of our work across London and the South East. Our Hertfordshire coverage includes Tewin Wood. You can also see our page for London.
Electronic leak detection in AL6 are booked the same way as anywhere else. Streets in the area include Cowpers Way, Desborough Drive and Firs Walk, all of which we cover. Close by, we survey roofs in Burnham Green (1 mile north-west), Bull's Green (1 mile north), Harmer Green (1 mile west), Tewin (1 mile south) and Datchworth (1 mile north). Within a short drive, we also cover Watford (15 miles south-west), Hemel Hempstead (14 miles south-west), Stevenage (5 miles north), St Albans (9 miles south-west), Bishop's Stortford (14 miles east) and Welwyn Garden City (3 miles south-west).
Local landmarks in Tewin Wood
Around Tewin Wood, our work takes us to homes and buildings near Belmont pub and the streets around them. The nearest railway station is Welwyn North station, about 1.4 miles west of the centre. A little further out are Howard Centre (2.8 miles south-west) and Hertford Castle (4.3 miles south-east). Open spaces near Tewin Wood include Tewin Orchard and Hopkyns Wood.
FAQs for Tewin Wood
Is Tewin Wood in the area you cover?
Yes. We work right across London and South East England, and Tewin Wood is part of that. You can phone 07833 053749 or email us with the address and a few details, and we’ll talk through which survey suits.
Is Tewin Wood within the area you cover?
Yes, Tewin Wood is on our map. Villages and rural addresses get the same survey as a town house, with the route planned beforehand.
Is this a RICS survey?
No. It is a specialist roof survey, not a RICS Level 2 or Level 3 building survey. It focuses on the roof, so it sits alongside a building survey rather than replacing it.
How experienced are you?
We have completed more than 5,000 surveys, over more than 20 years, and 98% of clients are satisfied.
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. We will talk about access as you book.
How much time does ELD need?
It usually takes as long as needed for the size of the roof and how it’s built, and we’ll give you a guide when quoting.
Do you carry professional indemnity insurance?
Our surveys are covered by professional indemnity and public liability insurance. Ask if you need details for a managing agent or building owner.