Greater London · London and the South East
Roof Leak Investigation in Blackfen
Know where you stand with the leaking roof before you spend money on it. We carry out roof leak investigations in Blackfen, with photos and a clear written report.
- Water through the ceiling under a flat roof
- Drips in the loft during heavy rain
- Wet patches high on an inside wall
Roof leak investigation in Blackfen
Not every drip is a leak. Condensation in a cold, poorly ventilated loft can drip from nails and timbers, and the stains look much like a leak. Telling the two apart matters, because they need very different work. The pattern of the damp, the ventilation and the timing all help us decide. Common reasons to book are drips in the loft during heavy rain and stains around a skylight, across valleys and parapet gutters, the roof space and chimney stacks.
London’s Victorian and Edwardian roofs have often been repaired many times, so a new leak can be the latest sign of wear rather than a single event. Telling wear from a one-off event matters, because insurers typically exclude wear and tear. A careful look in Blackfen tells the two apart where the evidence allows. A written record with photos helps you explain what was found to whoever deals with it next.
The report is yours to share with whoever needs it: a seller or estate agent, an insurer, a roofer, a builder or a managing agent, whichever applies.
- Place
- Blackfen (DA15, DA16, SE9)
- Wider area
- Greater London
- Prices
- From £150 inc. VAT
- Reports
- A written report with photos, by email
- When we survey
- Weekdays, Saturdays and Sundays
- Cover
- PI and public liability insurance
- Telephone
- 07833 053749
- Updated
- 27 October 2026
What happens if roof problems are left?
Patching the spot above the stain frequently doesn’t work. The real way in may be a metre or more away. An investigation finds the likely cause first. 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 is time to plan, rather than in a rush after a leak.
The Premium Survey includes thermal imaging and drone inspection where applicable, from £400 including VAT. We’ll tell you which package suits the questions you have.
Why us?
- Surveys on any day of the week
- Over 5,000 surveys carried out
- Plain-English reports with photos
- Prices that include VAT
Take a look at what a roof survey costs and two real surveys.
Also near Blackfen
More services for Blackfen
What this survey can’t tell you
To be straight with you, a roof survey has limits:
- Faults hidden behind ceilings or boarding
- An intermittent leak that shows no trace on the day
- Leaks from plumbing, tanks or pipework rather than the roof
If you are not sure which survey you need, ring 07833 053749 or send us an email and we’ll give you a straight answer before you book. What our survey covers.
What we look at
- Lead flashings
- Valleys and parapet gutters
- Chimney stacks
- Flat roof details
- Slate and tile slopes
- The roof space
- Rooflights and dormers
Your questions about roof leak investigations in Blackfen
Is Blackfen in the area you cover?
Yes, Blackfen is one of the places we work. The survey and report are the same in Blackfen as anywhere else, and visits run on weekdays and weekends.
Is my home in Blackfen listed or in a conservation area?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. Listed building consent is needed for changes that affect a listed building’s special interest, and conservation areas can limit changes of roofing material.
How long have you been surveying roofs?
We’ve completed more than 5,000 surveys, over more than 20 years, and 98% of clients are satisfied.
Does someone need to be in?
Not always. An outside-only look can be arranged beforehand, but the loft and any rooms with damp need someone to let us in.
Could my leak actually be condensation?
Condensation can look very like a leak. Widespread damp on the underside of the roof in cold weather, with blocked vents, suggests condensation. We check the pattern of damp and the ventilation, then say which is most likely.
How should I prepare for the leak investigation?
Note when the leak appears and what the weather was doing, and take photos. Clear access to the loft. Keep away from any light or socket that water is reaching.
Will you fly a drone over my roof?
Where it helps and it’s safe, yes. Whether we can fly on the day depends on the weather and the airspace rules, including flight restriction zones near airports. We hold a CAA Flyer ID and Operator ID.
How we price roof leak investigations
The price reflects the time and kit the roof needs. That comes down to:
- Whether it’s a home or a commercial building
- The roof’s overall size
- Chimneys, valleys, parapets and other details
- Whether you choose the Basic, Standard or Premium Survey
There are three survey packages: the Basic Survey from £150, the Standard Survey from £250 and the Premium Survey from £400, with VAT included. What your roof costs depends on its size, access and what you want to find out.
Helping us price your survey
What helps most when you contact us:
- Any stains, drips or damp patches you’ve seen indoors
- How the loft is reached, if there is one
- When you need the report by
- Where the property is, with the postcode
Our phone lines are open seven days a week, including Saturdays and Sundays. To book or ask a question, call 07833 053749 or drop us an email.
Useful tips for Blackfen property owners
Small things make a difference. Our tips:
- Clear the loft hatch so we can get in
- Protect furniture and flooring under the leak
- Note the weather when the leak shows
- Check whether pipes or tanks run near the stain
Once the work is done, hold on to the report. If water appears again, it shows what was found before, which makes the next step quicker.
Don’t block the vents at the eaves. Good airflow reduces condensation, which is often mistaken for a leak. Keep insulation clear of the eaves.
What a roof leak investigation looks like in Blackfen
Outer London has a good many Victorian and Edwardian terraces with slate roofs, but also a great many interwar semis, frequently with hipped roofs in clay or concrete tiles. If your home in Blackfen is one of them, bay roofs, hips and later dormers each have their own details. Knowing the roof type helps narrow down where water may be getting in. The wider area around Blackfen has a long history of building, with Danson House about 1.2 miles east. Older roofs in the wider area can hide decades of patch repairs, so the detail matters.
If you look after a building like Our Lady of the Rosary Catholic Primary School, water through a big roof can travel a long way before it drips, so the search covers more than the obvious spot. Shop and office owners around Broadway Shopping Centre may find that a quick answer on where water is coming in keeps a business running. If your house is among the older ones in the streets near Church of the Good Shepherd, lead flashings, valleys and old chimneys are typical places for water to get in.
Blackfen is about 2 miles east of Eltham, in Greater London. We carry out roof leak investigations in Blackfen for houses, flats, blocks and commercial buildings. Blackfen is one of the places in Greater London we cover. You can also see our page for London.
Roof leak investigations in DA15, DA16 and SE9 work the same way as everywhere else we cover. You will find streets such as Days Lane, Gordon Road and Kent Avenue, and we cover them all. Close by, we survey roofs in Falconwood (1 mile north), Avery Hill (1 mile west), East Wickham (1 mile north), New Eltham (1 mile south-west) and Longlands (1 mile south). We also work in nearby towns such as London (9 miles north-west), City of Westminster (11 miles north-west), Marylebone (11 miles north-west), Kensington (13 miles west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
Landmarks near Blackfen
Locally, jobs take us to homes and businesses close to The George Staples pub, Harris Academy Falconwood and Shoulder of Mutton Green and the streets around them. The nearest railway station is Falconwood station, roughly 0.8 miles north-west of the centre. Other landmarks nearby include Broadway Shopping Centre (2.3 miles east) and Eltham Community Hospital (1.7 miles west). Green spaces nearby include Summer Hill and The Tarn.
How the survey works
Expect us to ask a few questions before we start, about the roof’s history, any leaks and past repairs. The inspection then takes roughly 1–2 hours, more where the leak is intermittent or the roof is large. In Blackfen, visits are available on weekdays and at weekends. London parking is often by permit or pay-and-display, so it helps to know what’s near you, and to clear a path to the loft hatch. Upstairs rooms at the back are useful too, as they often give the best view of a rear addition.
- We start with what you’ve seen: where the stain is and when it gets worse.
- The visit starts indoors, at the stain and in the loft.
- Outside, we look at every likely route in.
- Where it helps, we take moisture readings and use thermal imaging.
- Your report sets out where the water is most likely getting in, with photos and recommendations.
Getting ready for the survey
- Have keys ready for side gates, garages or roof access doors
- Keep pets out of the way during the survey
- Let us know about parking before the day
Booking a survey
Most bookings start with a short call: phone 07833 053749 or email us and we will ask a few questions about the roof. You’ll have a price before anything is arranged.
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Rented homes, blocks and businesses
An agent can book and manage the survey for a landlord, with the report sent to whoever needs it. We agree a time with the tenant beforehand.
Shared roofs need a little more planning: we need access agreed with the freeholder or managing agent. Tell us about it when you book and we will plan the survey around it.