Greater London · London and the South East
Roof leak investigation in Cannon Hill, Greater London
Roof leak investigations for homes and businesses in Cannon Hill. More than 5,000 surveys completed across London and South East England.
- Leaks below a flat extension roof
- Damp on a chimney breast
- Stains around a skylight
About our roof leak investigation in Cannon Hill
Our job is to find the likely source and tell you. The report shows, with photos, where we believe the water gets in and how it travels, plus recommendations on what needs attention. Whoever does the work then has a clear starting point. The investigation finds and explains the cause, and the repair itself is a separate job. We survey rooflights and dormers, slate and tile slopes and chimney stacks, and the problems we’re asked to look at most are staining around the chimney inside and leaks that appear only in driving rain.
Water getting into a London home often comes from a detail you cannot see from the street: the valley gutter in a butterfly roof, a parapet gutter, a chimney flashing or the flat roof over a rear extension. Whether you are tracing a leak or recording storm damage in Cannon Hill, those are among the first places to look. A hidden gutter that overflows can send water a long way before it shows.
The report records the leaking roof as we found it on the day. It is useful right away, and a good reference for later, for example when you want to check whether anything has changed.
- Location
- Cannon Hill (SW20, SM4, KT3)
- Wider area
- Greater London
- Cost
- From £150 inc. VAT
- Report
- Emailed report with photos and recommendations
- When we survey
- Weekdays, Saturdays and Sundays
- Insurance
- PI and public liability insurance
- Phone
- 07833 053749
- Last updated
- 27 October 2026
What affects the price in Cannon Hill
We confirm the price for the job before booking. These are the things that affect it:
- The package you choose: Basic, Standard or Premium
- Whether it is a home or a commercial building
- Extensions, dormers and garages with roofs of their own
- How tall the building is and how easy the roof is to see
Thermal imaging and drone inspection (where it applies) come with the Premium Survey, which starts from £400, including VAT. We will tell you which package suits the questions you have.
What to let us know when you get in touch
Here’s what helps us most when you contact us:
- What kind of property and roof it is
- Any deadline, like an exchange date
- What made you get in touch
- Photos of the roof, taken safely from ground level or a window
To arrange a survey, call 07833 053749 or send us an email with the address and what you’d like to know about the roof. We’ll confirm the price before booking.
What happens on the day
It’s useful to start with what’s prompted the survey: a purchase, a leak, a storm, new work or simply peace of mind. It helps us focus on what matters most to you. The visit typically takes about one to two hours on an ordinary house, and more on a big or complicated roof. For a visit in Cannon Hill, parking and access are the things to plan: let us know about parking, the floor the property is on, any shared entrance and loft access. We then look at everything that’s safely in view from the ground, windows, the loft and, where it’s safe, the roof itself.
- You tell us where the water appears, when, and what the weather was doing.
- We examine the damp area and the rooms near it.
- From the roof space, we trace the water’s route where there is safe access.
- We inspect the likely entry points outside, from ground level, windows and the roof where safe.
- We email a written report showing where the water most likely gets in.
How to prepare
- Have keys ready for side gates, garages or roof access doors
- If you are buying, check with the agent that we can get in
- Gather any invoices or paperwork from past roof work
Book a survey
Every survey is priced before it is booked, so you know the cost up front. Roof leak investigation starts from £150, including VAT. To book, phone 07833 053749 or drop us an email.
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DIY checks: what’s safe
You can learn a lot from the ground. Binoculars help you spot slipped slates or tiles, gaps along the ridge and a leaning stack. Please do not climb up for a closer look.
Watch the gutters in a downpour, from a window or the ground. Water spilling over the edge can be a sign of a blockage or a gutter that has dropped.
Practical tips
Over many surveys, some simple habits stand out:
- Move stored items away from the hatch
- Tell us if there are tanks or pipes in the loft
- Write down the wind direction and rain when it leaks
- Protect furniture and flooring under the leak
If condensation is the cause, we explain it, and suggest how the loft space could be better ventilated. That avoids roof work that wouldn’t help.
Have leaves and moss cleared from gutters, valleys and outlets, ideally once the leaves have fallen. Many leaks start with a blocked outlet. Leave the clearing to someone with the right equipment.
Roof by roof
Parapet and box gutters
Linings, joints and outlets are inspected wherever it’s safe, and look for signs of past overflowing.
Slate and tile slopes
On slate roofs, corroded nails let slates slip. Even a single gap can let water in.
Cannon Hill roofs and the weather
Historic houses such as Southside House, about 1.2 miles north-west, show how far back building in the area around Cannon Hill goes. If your home is one of the older ones, expect a mix of original materials and later repairs on the roof, and a listed home or one in a conservation area may need consent for changes of material. Alongside Victorian and Edwardian terraces, outer London has a great many interwar semis, frequently with hipped roofs of clay or concrete tiles. Hips, bay roofs and later loft conversions are typical of those semis, if your home is one of them. Different coverings let water in at different points, which shapes where the search starts.
If your house is among the older ones in the streets near St James Merton, leaks on older roofs often start at lead flashings, valleys or around old chimney stacks. Trees in and around Cannon Hill Common shed leaves that can end up in nearby gutters, and blocked gutters overflow and soak walls. If you let a flat or house near South Merton station, tracing a leak quickly matters when a tenant is living with it.
Cannon Hill is about 1 mile north-west of Morden, in Greater London. In Cannon Hill, as across Greater London, every roof gets the same careful survey. Our Greater London coverage includes Cannon Hill. Our London page covers surveys nearby.
Roof leak investigations in SW20, SM4 and KT3 are booked the same way as anywhere else. Whether your property is on Aylward Road, Camborne Road and Botsford Road or anywhere close by, we can help. Close by, we survey roofs in Bushey Mead (1 mile north-west), Raynes Park (1 mile west), Wimbledon Chase (1 mile north), West Barnes (1 mile west) and Merton Park (1 mile north-east). Further out, we also cover London (9 miles north-east), City of Westminster (8 miles north), Marylebone (9 miles north), Kensington (7 miles north), St Pancras (10 miles north-east) and Shoreditch (11 miles north-east).
Around Cannon Hill
In Cannon Hill, that means homes and buildings near The Edward Rayne pub, Cannon Hill Common and Harris Academy Wimbledon. The nearest railway station is South Merton station, about 0.5 miles north-east. Well-known places in the area include St. Anthony's Hospital (1.5 miles south) and Wimbledon Museum (1.6 miles north). Open spaces near Cannon Hill include Cherry Wood and Henman Hill.
Landlord and commercial surveys in Cannon Hill
Buyers’ agents can book surveys on behalf of their clients. Reports are emailed, so they’re easy to pass on.
Shared roofs need a little more planning: we need access agreed with the building owner or managing agent. Mention it when you contact us and we will plan the visit with that in mind.
Cannon Hill questions
Is Cannon Hill in the area you cover?
We do. Every survey there gets the same written report with photographs, and visits run on weekdays and weekends.
Is parking a problem for a survey in Cannon Hill?
Parking in Cannon Hill, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
What does the report include?
You get our findings in writing, part by part, with photos, and ends with what we recommend. Points are put in order of urgency where relevant.
Will you check the loft?
Yes, where the survey calls for it and there is safe access. We look for staining, damp, daylight and signs of movement, as far as the space allows.
How soon will I get the report?
That depends on the survey you book: the Basic Survey report arrives within 48 hours, the Standard Survey in 24 to 48 hours and the Premium Survey the same day. Reports are sent by email.
Do you climb onto every roof?
Only when it’s safe. Safe viewpoints, the roof space and a drone where it applies cover most of what’s needed, and anything out of sight is recorded in the report.
Why doesn’t the damp patch line up with the hole?
Water rarely drops straight down. It can follow a timber or the underlay a long way first, so the entry point is often well away from the mark. We follow the route back instead of guessing.