Greater London · London and the South East
Electronic Leak Detection in Penge
Electronic leak detection to pinpoint holes in flat roof membranes for Penge and the rest of Greater London. We survey on any day of the week.
- Repairs that haven’t stopped the leak
- Damage from equipment installers
- Leaks under green or ballasted roofs
Electronic leak detection in Penge: what you get
Some flat roofs can’t be tested electronically. Some membranes conduct electricity themselves and some roofs do not have a suitable layer beneath the membrane. If your roof isn’t suitable, we will tell you at the start. Telling us what you know about the roof’s membrane and layers helps, like drawings or specifications. It saves a wasted visit. Common reasons to book are leaks through a covered membrane and holes left by work on the roof, on roof terraces and balconies, flat roof membranes and liquid-applied waterproofing.
Water getting through a flat roof in London can travel under the covering and appear some way from the hole. Outlets, upstands against parapet walls and joins with the main roof are frequent culprits. In a converted house in Penge, the roof above may belong to the building rather than one flat.
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.
- Where
- Penge (SE20, SE19, SE26)
- Wider area
- Greater London
- Cost
- Quoted for your roof
- Your report
- Written, with photos, emailed to you
- Survey days
- Weekdays and weekends
- Insurance
- PI and public liability insurance
- Phone
- 07833 053749
- Updated
- 27 October 2026
The survey, step by step
We work from the outside in: outside views come first, then the roof space if there’s safe access. In total, it takes as long as needed for the membrane area and the build-up, which we’ll explain when we quote. In converted houses and mansion blocks, the loft hatch is often on a shared landing. If that applies to your building, it helps to agree access with the neighbours or the managing agent first. Otherwise, the visit in Penge runs like any other.
- We start with what you know about the roof and the leak.
- The roof is assessed for suitability first.
- The test method is chosen to suit the roof.
- We test the roof and locate any breaches.
- You get a report with photos of each breach.
Before we arrive
- Point out any leaks or damp patches
- If it isn’t your property yet, arrange access through the agent
- For flats, check roof access has been agreed
How to book
You can call us seven days a week. For a price or to book, ring 07833 053749 or send us an email.
Advice
Electronic leak detection in Penge: local notes
Close to the centre of London, a great many houses are Victorian or Edwardian terraces, many of them roofed in Welsh slate. Many have butterfly roofs draining to a central valley gutter, with parapet walls and gutters hidden behind them. Lead flashings, party-wall upstands and shared chimney stacks are typical of these houses, if yours is one of them. Next to the main roofs there’s typically a flat roof somewhere, whether on an extension, a garage or a commercial unit. Kingswood House, about 1.4 miles north-west, is one of the historic houses in the wider area around Penge. Older roofs in the wider area can hide decades of patch repairs, so the detail matters, and a listed home or one in a conservation area may need consent for changes of material.
Controlled parking zones are common in London, so mention any permit rules for Penge. Take a building like Harris Primary Academy Crystal Palace: large flat roofs, common on schools and other public buildings, need their outlets, upstands and coverings checked regularly. Landlords with a home close to Penge West station may find that flat roofs on let property tend to be checked only when they fail, which is the costly way round.
Penge is about 1 mile west of Beckenham, in Greater London. We cover Penge and the rest of Greater London, as part of our work across London and South East England. Penge is one of the towns and villages in Greater London where we work. London is in our area too.
We cover every part of the SE20, SE19 and SE26 postcode area for electronic leak detection and the streets around it. If you need electronic leak detection at a property on High Street, Anerley Station Road and Station Road or a nearby road, we can help. Main roads around Penge include the A234, which makes travel easy. Other places close to Penge include Anerley (1 mile west), Crystal Palace (1 mile north-west), Sydenham (1 mile north), Gipsy Hill (1 mile north-west) and Upper Norwood (1 mile west). Larger places within reach include London (6 miles north), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (8 miles north-west), St Pancras (8 miles north) and Shoreditch (8 miles north).
Near you in Penge
Locally, jobs take us to homes and businesses close to Crystal Palace School, Crooked Billet pub and Crystal Palace Dinosaurs, among other places. Penge has its own railway station: Penge West station. Well-known places in the area include St Christopher's Hospice (0.5 miles north) and Crystal Palace Museum (0.8 miles north-west). Not far away are Dulwich Upper Wood and Knight's Hill.
Useful tips for Penge property owners
A survey works best with a little help from you, before and after. Tips:
- Tell us about the membrane and build-up if you know it
- Limit access to the roof
- Don’t let outlets block
- Do not keep patching the same spot
After your roofer repairs the breaches, a retest can confirm them, where the roof still suits the method.
Consider testing a new membrane before it is covered. It’s easier to find holes before more layers are added.
What we can’t see
It is a careful look at the flat roof membrane, not the whole story. Its limits include:
- Leaks from plumbing or windows
- Repairing the breaches (that’s for your roofer)
- The extent of water in the insulation
Not sure which survey suits your roof? You can phone 07833 053749 or use the contact form and we will tell you. The full list of what we check.
What this survey covers
- Flat roof membranes
- Liquid-applied waterproofing
- Commercial flat roofs
- Green roofs
- Roof terraces and balconies
- Single-ply roofs
What we look for on each type of roof
Liquid-applied waterproofing
Liquid waterproofing has no laps but holes and thin areas can occur. Suitability for ELD depends on the system.
EPDM rubber roofs
EPDM rubber roofs frequently last 30–50 years, but punctures and seam failures still happen.
Penge: your questions answered
Do you cover Penge?
We do. Every survey there gets the same written report with photographs.
Will parking be an issue for a roof survey in Penge?
Parking in Penge, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
How does ELD work?
It uses an electrical current to find breaches in a flat roof membrane. A breach lets the current through so we can pinpoint it.
What happens after the survey?
You receive the written report by email, with photographs and recommendations. It is yours to share with a seller, insurer, roofer or managing agent, whichever applies.
Will you repair the leak?
No. We test the membrane and report. The report shows where each breach is for your roofer to repair.
Do I need to be at home?
Not necessarily. An outside-only look can be arranged beforehand, but anything inside needs someone there to give access.
Can you inspect my roof with a drone?
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 the airspace and weather are checked before every flight.
Nearby places to Penge
What else we do in Penge
Leave it or get it looked at?
Some flat roof leaks come from walls or details. ELD helps rule the membrane in or out, so other causes can be checked. Work on a London roof is rarely simple to arrange, with parking, neighbours and access all to think about. That’s a good reason to find problems early, while there’s time to plan.
What a survey costs comes down to the roof itself: how big it is, how high it is, the number of separate roofs and how it can be reached and seen safely. Electronic leak detection is quoted for your roof, because the method depends on the roof.
Why book us in Penge
- Thermal imaging and drone inspection where they help
- PI and public liability insurance
- An independent look at the roof
- Surveys seven days a week
Read our cost guide and what we found on two real jobs.
Landlords, agents and block managers in Penge
We survey roofs for landlords and agents as well as householders. A photo-illustrated written report gives you a clear record of the flat roof membrane.
Where a roof is shared: we need access agreed with whoever owns or manages the building. Tell us about it when booking and we’ll plan the survey around it.