Greater London · London and the South East
Thermal imaging roof survey in Cannon Hill, Greater London
We take a careful look at the roof at your property in Cannon Hill, and put it all in a written report with photos.
- Missing or slipped insulation
- Damp around chimneys and parapets
- Leaks that are hard to trace
Thermal roof surveys for homes and businesses in Cannon Hill
A thermal survey can point to places where heat is escaping through the roof. Gaps in loft insulation and poorly insulated areas can stand out on the images. The difference shows most clearly when it’s warm inside and cold outside. The report shows the images and explains what they may mean. It isn’t an energy rating or a heat loss calculation. We are often asked to look into damp around roof outlets and upstands and areas of a flat roof that may hold water, on insulated roof spaces, pitched roof slopes and ceilings below the roof.
Flying in London takes more checking than most places: there are flight restriction zones around Heathrow, London City and London Heliport, and restricted areas over Hyde Park, the City of London and the Isle of Dogs. Every address in Cannon Hill is checked before any drone flight, and where permission is needed, the flight waits for it.
Most points in the report come with a picture, because a photo of a cracked flashing says more than a paragraph. If something couldn’t be seen safely, the report is clear about it.
- Location
- Cannon Hill (SW20, SM4, KT3)
- Wider area
- Greater London
- Price
- From £400 inc. VAT
- Report
- Emailed report with photos and recommendations
- Survey days
- Weekdays, Saturdays and Sundays
- Insured
- Professional indemnity and public liability
- Call
- 07833 053749
- Updated
- 27 October 2026
DIY checks: what’s safe
The one thing to avoid is getting up close. Roofs are fragile and slippery, and falls from height are serious. That part is for a survey, using safe viewpoints and a drone where it applies.
Inside, the loft is a good place to look, with care. Use a torch and stay on the joists or boards, and look for staining, damp timber or daylight coming through.
Also near Cannon Hill
What else we do in Cannon Hill
Drones, thermal imaging and Cannon Hill roofs
With Southside House about 1.2 miles north-west, Cannon Hill sits in an area with a long building history. If your home is one of the older ones, expect a mix of original materials and later repairs on the roof, and any change of roofing material on a listed home needs checking with the council first. Outer London has plenty of Victorian and Edwardian terraces with slate roofs, but also a great many interwar semis, frequently with hipped roofs in clay or concrete tiles. Hips, bay roofs and later loft conversions are typical of those semis, if your home is one of them. Where a roof is steep, tall or hard to see from ground level, drone photos and thermal images add detail.
As a London address, Cannon Hill can be tricky for parking: let us know about parking bays, permits or a driveway when you book, as a space near the door can’t be promised. Shop and office owners around Bentall Centre may find that big, flat commercial roofs are where close-up aerial shots and thermal images help most.
Cannon Hill is about 1 mile north-west of Morden, in Greater London. We survey roofs in Cannon Hill and the rest of Greater London, as part of our work across London and the South East. Cannon Hill is one of the places in Greater London where we work. There’s also a page for London.
We survey roofs across the SW20, SM4 and KT3 postcode area for thermal roof surveys. We offer thermal roof surveys to properties on Aylward Road, Camborne Road and Botsford Road. Other places close to Cannon Hill include 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).
Landmarks near Cannon Hill
We work in homes and buildings around The Edward Rayne pub, Cannon Hill Common and Harris Academy Wimbledon. The closest station to Cannon Hill is South Merton station, roughly 0.5 miles north-east. Nearby you will also find St. Anthony's Hospital (1.5 miles south) and Wimbledon Museum (1.6 miles north). The countryside around Cannon Hill includes Cherry Wood and Henman Hill.
Practical tips
You do not need to be a roofer to help. Here’s what helps most:
- Use the report as a baseline for later checks
- Ask us about the forecast if rain is expected
- Leave the roof to people with safe access
- Clear a path to the loft hatch before we arrive
You also get an in-person consultation with a Premium Survey, giving you the chance to talk through the images and findings. A follow-up 12 months later is included as well.
After repairs or a new covering, a later survey can confirm things are dry, when the conditions are suitable.
What we do, step by step
When we arrive, we begin with a quick chat about the roof and anything that is worrying you. After that, we look at everything we can see safely, from ground level, from windows, in the roof space and by drone where applicable. The survey normally takes between one and two hours for most houses, and longer for a large or complex roof. London terraces rarely offer a view of the whole roof from one spot, so a visit in Cannon Hill moves between viewpoints: the pavement, upstairs windows, the loft and any safe spot at the back. If other people live in the building, tell us who can let us into the shared parts.
- We go through the roof, the problem and the weather expected on the day.
- The roof is inspected visually from safe positions.
- We take thermal images of the roof and of the loft where we can reach it.
- Patterns that stand out are checked with moisture readings.
- Each image is set beside a normal photo and explained in the report.
Getting ready for the survey
- Have any paperwork from past roof work to hand
- Make sure the loft hatch can be reached
- Leave side gates unlocked
How to book
To arrange a survey, call 07833 053749 or send us an email and let us know the address and what’s prompted the survey. You’ll know the price before anything is booked.
Related advice
Common questions in Cannon Hill
Will parking be an issue for a roof survey in Cannon Hill?
It depends on the street. If Cannon Hill has controlled parking where you are, a visitor permit is the easiest answer, and a driveway is even better.
Can you fly a drone over a roof in Cannon Hill?
Normally it comes down to two things: the airspace at the address and the weather. London’s airspace includes flight restriction zones around Heathrow, London City Airport and London Heliport, and restricted areas over Hyde Park, the City of London and the Isle of Dogs. Every London address is checked against them before a flight. Every flight is checked against the Drone Safety Map first. Strong wind or a downpour also stops a small drone flying, and the rest of the survey does not depend on the drone.
Will I get photos?
Yes, every report has them. Pictures sit next to the findings they show.
How does a thermal imaging roof survey work?
A thermal camera shows differences in surface temperature. The patterns can suggest wet insulation, gaps in insulation or heat escaping. Findings are checked with moisture readings.
Can you survey a shared roof?
Yes. A shared roof needs access agreed first, with the building owner or managing agent. Mention it when you contact us and we will explain what’s needed.
How long does the survey take?
Time on site depends on the roof; most visits take an hour or two at a house, including the thermal images, and around 3–4 hours for a commercial roof. The written report follows by email.
Do I have to be there for the survey?
If the survey includes the loft or the inside of the building, someone needs to let us in. We’ll talk about access as you book.
Why it’s worth a survey now in Cannon Hill
Without thermal imaging, the only way to see how far water has spread is often to open up the roof. It helps when deciding whether to patch an area or replace the roof. In Cannon Hill, as in much of London, water from a roof defect can reach a neighbour’s home as easily as yours: failed flashings and blocked valley gutters can send water into more than one home. Finding it early keeps the work smaller.
A small, low roof with good viewpoints takes less time than a tall, complicated one, and the package matters as well. The price is always agreed first.
Why us?
- We hold a CAA Flyer ID and Operator ID
- 98% customer satisfaction
- Surveys seven days a week
- 5,000+ roofs surveyed
Take a look at how roof surveys are priced and two real surveys.
Roof by roof
Pitched slate and tile roofs
Thermal images of a pitched roof can still show heat loss patterns and some damp areas. We explain what can and cannot be read from them.
GRP fibreglass roofs
GRP roofs are laid over timber boards, so trapped moisture can affect the deck. The camera can help show where to look.
Signs you need a thermal roof survey in Cannon Hill
Some owners book because the rooms under the roof feel cold. Gaps in loft insulation and poorly insulated roof areas can show up on the camera, particularly when there’s a clear difference between inside and outside.
Typical things we’re asked to look at include:
- Heat escaping through the roof
- Water getting in at parapets and stacks
- Ceilings that feel colder in places
- Stains that keep coming back
Take a building like Hillcross Primary School: thermal images can show where wet insulation sits under a big flat roof.
Before you book any roof surveyor
- Whether you get a written report with photos
- How they’ll see the roof: from ground level, the loft, the roof or by drone
- Their drone registration, if they fly one
- What happens after the report arrives