Greater London · London and the South East
Telegraph Hill Electronic Leak Detection
Electronic leak detection to pinpoint holes in flat roof membranes for Telegraph Hill, from an experienced roof surveyor. Every survey comes with a written report and photographs.
- Leaking laps in the waterproofing
- Holes left by work on the roof
- Repairs that haven’t stopped the leak
Electronic leak detection in Telegraph Hill: what you get
We carry out electronic leak detection on flat roofs in Telegraph Hill and across London and South East England. Testing usually takes more time on a big roof than a small one, and the build-up of the roof makes a difference too. Every roof is quoted on its size and build-up. The results come in a written report with photos. We survey green roofs, liquid-applied waterproofing and flat roof membranes, and the problems we’re asked to look at most are holes left by work on the roof and water coming in under a flat roof.
Commercial and residential blocks across London often have big flat roofs with plant, rooflights and access walkways. Every penetration and upstand is a place where a membrane can fail. In Telegraph Hill, roof access is agreed with the building manager or owner beforehand. Rooflights, plant supports and pipe entries are common places for a membrane to fail.
The report is yours to share with whoever needs it: your solicitor, the seller, your insurer, a roofer or the building’s managing agent.
- Place
- Telegraph Hill (SE4, SE15, SE14)
- Region
- Greater London
- Price
- Quoted for your roof
- Your report
- A written report with photos, by email
- Appointments
- Monday to Sunday, daytime
- Insurance
- Professional indemnity and public liability
- Phone
- 07833 053749
- Updated
- 27 October 2026
What electronic leak detection looks like in Telegraph Hill
Close to the centre of London, a great many houses are Victorian or Edwardian terraces, many of them roofed in Welsh slate. A butterfly roof with a central valley gutter, tucked behind a parapet wall, is common on these houses. In a house like that, shared stacks, party-wall upstands and lead flashings all need looking at as far as they can be seen. Next to the main roofs there’s normally a flat roof somewhere, whether on an extension, a garage or a commercial unit. Historic houses like Queen's House, about 2 miles north-east, show how far back building in the area around Telegraph Hill goes. Older homes in the wider area frequently have features worth a closer look, like lead valleys, tall stacks and roofs that have been patched over the years, and the council can say whether a home is in a conservation area.
If you look after a building such as Haberdashers' Hatcham College, ponding and blocked outlets on a wide flat roof are worth catching before the next wet season. For a London address like Telegraph Hill, it’s useful to know about controlled parking before the day, along with any off-street space. For an older house near a landmark like St Catherine's Hatcham, flat-roofed rear additions and dormers added over the years are worth checking.
Telegraph Hill is about 1 mile south-west of New Cross, in Greater London. We carry out electronic leak detection in Telegraph Hill for houses, flats, blocks and commercial buildings. Our Greater London coverage includes Telegraph Hill.
We cover every part of the SE4, SE15 and SE14 postcode area for electronic leak detection. That includes homes and businesses on Mona Road, Pepys Road and Kitto Road. Neighbouring places we cover for electronic leak detection include Nunhead (1 mile south-west), New Cross (1 mile north-east), Peckham (1 mile north-west), St Johns (1 mile east) and Brockley (1 mile south-east). Within a short drive, we also cover London (3 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north).
Local landmarks in Telegraph Hill
Around Telegraph Hill, our work takes us to homes and buildings near Fordham Park and The Brockley Barge pub and the streets around them. Telegraph Hill has its own railway station: Brockley station. A little further out are Southwark Adult Education Institute (0.6 miles north-west) and Lewisham Shopping Centre (1.4 miles east). The countryside around Telegraph Hill includes St. James's Park Lake and New Cross Gate Cutting.
Other services in Telegraph Hill
Prices for electronic leak detection in Telegraph Hill
Several things affect the price of a survey:
- Whether thermal imaging or a drone is needed
- The type of building, from a house to a block or an office
- Extensions, dormers and garages with roofs of their own
- How complicated the roof is, with its valleys, chimneys and parapets
All our prices include VAT. We quote electronic leak detection for each roof, as the method and time depend on the roof. We confirm the price for your survey before booking.
Helping us price your survey
What helps most when you contact us:
- The kind of building and roof involved
- The address and postcode of the property
- Pictures of the roof from a safe spot, if you have them
- What’s prompted the survey
Surveys can be booked for weekdays, Saturdays or Sundays. To arrange a day that suits you, call 07833 053749 or send us an email with the address and the days you’d prefer.
How it works
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. Most surveys take more time on a big roof than a small one, with the construction of the roof playing a part too. For a visit in Telegraph Hill, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor the property is on and how to get into the loft. We then look at everything that’s safely in view from the ground, windows, the loft and, where it’s safe, the roof itself.
- First, we confirm which roof areas are included.
- We get the roof ready for testing.
- We work across the roof with the test equipment.
- Each breach found is located and recorded.
- You receive the results to pass to your roofer.
Before the survey
- Have any paperwork from past roof work to hand
- Buyers: confirm access with the estate agent or seller
- Point out any leaks or damp patches
Book a survey
Getting a price is simple: just phone 07833 053749 or use the contact form, let us know about the property and we will point you to the right survey. The price is agreed up front.
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What electronic leak detection doesn’t cover
It is a careful look at the flat roof membrane, not the whole story. Its limits include:
- The extent of water in the insulation
- Some conductive membranes
- Carrying out the repair work
If you’re not sure which survey you need, phone 07833 053749 or use the contact form and we’ll give you a straight answer before booking. What our survey covers.
Roofs we survey in Telegraph Hill
- Flat roof membranes
- Liquid-applied waterproofing
- Commercial flat roofs
- Single-ply roofs
- Green roofs
- Roof terraces and balconies
What we look for on each type of roof
Inverted and paved roofs
If the build-up rules out ELD, we’ll say so.
Single-ply membranes
ELD often works on single-ply membranes, depending on the type and build-up.
Tips from our surveys
A little preparation and a few simple habits help. Our tips:
- Limit access to the roof
- Don’t leave water getting in
- Find the breach before more patching
- Keep a note of leaks after rain
The report records each breach location with photos. Pass it to your roofer to repair the breach points.
Consider testing a new membrane before it’s covered. It’s easier to find holes before more layers are added.
FAQs for Telegraph Hill
Is Telegraph Hill in the area you cover?
Yes, Telegraph Hill is within the area we cover. We survey roofs across London and the South East. Just call 07833 053749 or drop us an email and let us know about the property, and we will talk through which survey suits.
Will parking be an issue for a roof survey in Telegraph Hill?
Typically it is manageable with a little notice. Let us know the parking rules on your street and we’ll work around them.
How do you choose the testing method?
The method is chosen to suit the roof. Low-voltage methods are usually carried out on a wet roof, while high-voltage testing needs a dry, exposed membrane.
How much time does ELD need?
It depends on the size of the roof and its build-up. We will give you an idea when we quote.
What’s the price of ELD?
Electronic leak detection is quoted for your roof, because the method depends on the roof. The price depends on the roof’s size and build-up. To get a quote, ring 07833 053749 or send us an email.
What will the report tell me?
It explains what we saw, what it means and what we’d suggest, backed by photos. It also says if any part of the roof couldn’t be seen safely.
Does the weather affect the survey?
It can, depending on the survey. Drone flights need calm, dry weather, and thermal imaging works best with a dry roof, little wind and a sunny day beforehand. We will rearrange with you if the weather isn’t right.
DIY checks: what’s safe
During heavy rain, look at the gutters from the ground or a window. Water spilling over the edge can point to a blockage or a sagging run.
After heavy rain, check ceilings and the tops of walls for new stains. Photograph them and note the date, which helps when we check the roof.