Hampshire · London and the South East
Four Marks Electronic Leak Detection
Know where you stand with the flat roof membrane before you spend money on it. Electronic leak detection in Four Marks.
- Leaking laps in the waterproofing
- Damp inside with no sign on the roof
- Holes around roof penetrations
Electronic leak detection for homes and businesses in Four Marks
Roofs covered with paving, ballast or planting need more thought. The layers on top can limit the methods we can use and parts may need to be lifted. We’ll discuss it with you when we quote. Any details of the build-up help because they show what’s under the surface. We will tell you if the roof can’t be tested. We’re frequently asked to look into leaks that return after repairs and new roofs to check before paving or planting, on flat roof membranes, green roofs and roof terraces and balconies.
Outbuildings, garden rooms and garages in places like Four Marks often have flat roofs of their own. They’re easy to forget, but water through a garage roof can spoil whatever is stored inside. It is worth mentioning them when you book, so the visit can include them. Felt, rubber and GRP coverings on garages and outbuildings age in just the same way as the main roof’s.
The report does not just list problems. It explains what we found, why it matters and what we recommend, so you can decide what to do next.
- Where
- Four Marks (GU34)
- Region
- Hampshire
- Prices
- Quoted for your roof
- Report
- A written report with photos, by email
- When we survey
- Weekdays and weekends
- Cover
- PI and public liability insurance
- Phone
- 07833 053749
- Last updated
- 27 October 2026
How it works
Once we have finished looking, we write up our findings as a written report with photos, emailed to you. As for time on site, it typically takes longer on a large roof than a small one, and the build-up of the roof makes a difference too. Homes around Four Marks often have gardens on more than one side, which gives us room to step back and see the roof. Mention any side of the property we can’t get to. Inside, the loft is looked at where it can be reached safely.
- First, you tell us about the roof build-up and where water is showing.
- We confirm whether the roof is suitable for electronic testing.
- The testing method is chosen to suit the membrane and build-up.
- The roof is tested and any breaches are located.
- You get a report showing where each breach is, for your roofer to repair.
Getting ready for the survey
- Dig out any old roof reports or invoices
- Note where any stains or damp appear
- If the roof is shared, arrange access with whoever manages the building
Book a survey
You can call us seven days a week, including Saturdays and Sundays. To book or ask a question, ring 07833 053749 or use the contact form.
Read more
When to book a survey in Four Marks
Joints and laps in a membrane can fail over time. Small openings at laps can leak for months before it shows.
Here are some of the things we see often:
- Patched roofs that still leak
- Breaches around outlets and penetrations
- Water coming in under a flat roof
- Gaps at membrane joints
If you live in an older home near Church of the Good Shepherd, later flat-roofed additions are common on older houses, and their edges and upstands often show the first signs of wear.
Before booking any roof surveyor
- Whether they hold professional indemnity and public liability insurance
- Whether the loft is part of the inspection
- What the report includes, and whether it has photos
- Whether VAT is added on top
Places near Four Marks
Other services in Four Marks
What electronic leak detection looks like in Four Marks
A number of Hampshire villages keep thatched roofs on their older buildings. Across the South East, older homes tend to have slate or clay tiles, and many later ones concrete tiles. Next to the main roofs there is normally a flat roof somewhere, whether on an extension, a garage or a commercial unit. The wider area around Four Marks has a long history of building, with Bentworth Hall about 2.7 miles north. 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.
Take a building like Four Marks Church of England Primary School: large flat roofs, common on schools and other public buildings, need their outlets, upstands and coverings checked regularly. For landlords with property near Alton station, flat roofs over rear additions and dormers in rented property are worth checking between tenancies.
Four Marks is about 4 miles south-west of Alton, in Hampshire. Four Marks is one of many places we visit across Hampshire, for homes and businesses alike. Four Marks is one of the towns and villages in Hampshire where we work for electronic leak detection. For surveys nearby, see our Southampton page.
Every address in GU34 is covered for electronic leak detection. That includes homes and businesses on Read's Field, River Close and Chalk Close. If you are just outside Four Marks, we cover Medstead (1 mile north), Soldridge (1 mile west), South Town (2 miles north-west), New Copse (2 miles north) and Hattingley (2 miles north-west). We also work in nearby towns like Basingstoke (11 miles north), Winchester (12 miles west), Fleet (15 miles north-east), Horndean (14 miles south), Alton (4 miles north-east) and Petersfield (9 miles south-east).
Local landmarks in Four Marks
The nearest railway station is Alton station, roughly 4.6 miles north-east. Well-known places in the area include Barton Castle (3.5 miles north-west) and Alton Community Hospital (3.3 miles north-east). For a walk, there is Red Hill.
What we cannot see
We only report whatever is safely visible on the day, so there are some things a survey cannot cover:
- Parts of the roof covered by fixed equipment
- Moisture spread under the membrane
- Some conductive membranes
If you’re not sure which survey you need, ring 07833 053749 or drop us an email and we will give you a straight answer before booking. What our survey covers.
Roofs we survey in Four Marks
- Commercial flat roofs
- Flat roof membranes
- Liquid-applied waterproofing
- Green roofs
- Roof terraces and balconies
- Single-ply roofs
Why act early in Four Marks
Some flat roof leaks come from walls or details. Testing shows whether the membrane is breached so attention can go to the right place. Blocked gutters on homes around Four Marks overflow and soak walls. Dealing with the cause is simple; drying out a wall is not.
To find out what your survey will cost, call 07833 053749 or use the contact form with the address and a few details. We’ll confirm the figure before booking.
Why book us in Four Marks
- 98% customer satisfaction
- Drones and thermal imaging where it applies
- A sub-250g drone, flown with a CAA Flyer ID and Operator ID
- An independent view of the roof
Read how roof surveys are priced and our case studies.
Common questions in Four Marks
Is my home in Four Marks listed or in a conservation area?
For listing, use Historic England’s list; for conservation areas, ask the council. It matters most if you are planning to re-roof in a different material.
Do you cover Four Marks?
Yes, Four Marks is within the area we cover. We cover the whole of London and South East England. Just call 07833 053749 or drop us an email and tell us about the property.
What will the report tell me?
It sets out what we found, why it matters and what we recommend, with photos throughout. It also says if any part of the roof couldn’t be seen safely, so you know exactly what was covered.
Do you look in the loft space?
Usually, if there is one and it can be reached safely. The loft space can show things the outside can’t, such as damp timbers, staining or daylight.
Is the repair part of the test?
No. We test the membrane and report. The report shows where each breach is for your roofer to repair.
Can you inspect my roof with a drone?
Yes, where it’s applicable. We hold a CAA Flyer ID and Operator ID and fly a drone under 250g, and the airspace and weather are checked before every flight.
Does electronic leak detection work on all membranes?
It depends on the membrane and the build-up. Share any details you have and we will confirm suitability.
Different roofs, different checks
Green and ballasted roofs
Green roofs and ballasted roofs cover the waterproofing. Some methods can work through these layers but it depends on the layers.
Inverted and paved roofs
If the build-up rules out ELD, we will say so.
Practical tips
These tips come from what we see on roofs every week:
- Keep outlets clear of debris
- Make sure trades protect the waterproofing
- Consider ELD before paving or planting goes on
- Avoid repeated repairs without finding the cause
The report records each breach location with photos. Pass it to your roofer to repair the breach points.
Keep people off the flat roof unless they need to be there. Many breaches come from foot traffic.