Greater London · London and the South East
Underhill Thermal Roof Survey
Thermal imaging to find moisture and heat loss patterns in a roof for Underhill, from an experienced roof surveyor. You get a clear written report with photographs.
- Wet areas near outlets and upstands
- Damp around chimneys and parapets
- Damp that repairs haven’t cured
Thermal roof survey in Underhill
Flat roofs over extensions, garages, flats and commercial buildings are where thermal imaging often helps most. Patterns can suggest where water is trapped under the covering. Pitched roofs with slates or tiles are often harder to read, because of the air space beneath, so we combine the camera with an inspection from the loft where there’s safe access. Common reasons to book are stains that keep coming back and areas losing heat at the eaves and junctions, on loft conversions, pitched roof slopes and ceilings below the roof.
London roofs sit shoulder to shoulder in terraces and blocks, which makes care around neighbours part of the job. We take care to focus on the roof we have been asked to look at, in Underhill as anywhere. Let us know about the building and access as you book. Steep slopes, tall chimneys and rear additions are where the extra view helps most.
With the Standard Survey, you also get moisture detection, a structural check and a follow-up consultation. The Premium Survey goes further, with thermal imaging, drone inspection where it applies, structural analysis and an in-person consultation.
- Place
- Underhill (EN5, N20)
- Wider area
- Greater London
- Cost
- From £400 inc. VAT
- Report
- A written report with photos, by email
- Appointments
- Weekdays and weekends
- Insured
- Professional indemnity and public liability
- Call
- 07833 053749
- Last updated
- 27 October 2026
Different roofs, different checks
Loft insulation
Heat loss shows most clearly when it is warm inside and colder outside. Our report notes how the conditions affected the images.
Felt and asphalt flat roofs
Felt and asphalt roofs often show wet areas as patches that differ from the rest. We check those patches with moisture readings.
Leave it or get it looked at?
Buyers get extra information from thermal images that the eye can miss. Finding hidden moisture before exchange gives you facts to raise with the seller. Behind a London parapet, a blocked gutter can sit full of water without anyone seeing it. By the time a ceiling stains, the timbers underneath may have been wet for a while.
The cost of a survey depends on the roof: its size, its height, how many sections it has and how safely it can be seen. Prices start from £400, including VAT.
What you get with us
- Visits on any day of the week
- Thermal imaging and drones used where they help
- More than 20 years surveying roofs
- An independent view of the roof
See what a roof survey costs and our case studies.
How the survey works
We work from the outside in: first the slopes, edges and gutters from every safe viewpoint, then the loft space where it can be reached. In total, it takes an hour or two for a house, and about three to four hours for a commercial roof. For a visit in Underhill, 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. On the day, the roof is looked at from ground level, from windows, from inside the loft space and from the roof where it’s safe.
- First we discuss the roof, any damp and the forecast for the visit.
- 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.
- The report pairs each thermal image with a photo and explains what it suggests.
How to prepare
- Unlock side gates and any roof access doors
- Move anything stored under the loft hatch
- Gather any invoices or paperwork from past roof work
Arrange a survey
Photos help, if you have them. Pictures from the ground or a window are fine. To get started, ring 07833 053749 or use the contact form.
Advice
Also near Underhill
Other services in Underhill
Questions from Underhill
Is my home in Underhill listed or in a conservation area?
We cannot confirm that for you, but Historic England’s list and your council can. Both listing and conservation areas can limit changes of roofing material.
Are there drone restrictions around Underhill?
That depends on where the roof is and on the weather. Across London there are restriction zones around Heathrow, London City and London Heliport, plus restricted areas over Hyde Park, the City of London and the Isle of Dogs. Each address is checked against all of them before the drone goes up. Before any flight, we check the Drone Safety Map for airspace restrictions. The flight also waits for calm, dry weather.
Will the survey show heat loss through my roof?
The camera can point to heat loss and gaps in insulation. The survey is not an energy rating or a heat loss calculation, but the images show where improvements may help.
Do I have to be there for the survey?
That depends on the survey. For inside areas and the loft space, someone has to give us access, while outside access can be discussed when booking.
Will the camera show exactly where the water is?
No, not on its own. It shows surface temperature, and wet areas can show up because they hold heat differently. That’s why we check any patterns with moisture readings.
Will thermal imaging find my leak?
Thermal imaging can help, alongside other checks. The results depend on conditions on the day. Where it cannot be pinned down, the report suggests a next step, like electronic leak detection.
Which survey includes thermal imaging?
Our Premium Survey, from £400, includes thermal imaging. An in-person consultation and a follow-up 12 months later are included too. For bigger commercial roofs, we quote on size.
What affects the price in Underhill
A few things affect what a survey costs:
- Commercial roofs and larger buildings
- How tall the building is and how easy the roof is to see
- How big the roof is
- How complicated the roof is, with its valleys, chimneys and parapets
Prices quoted always include VAT, and the written report is part of the package. Our price is from £400, including VAT. Where your roof sits in the range depends on its size, height and access.
Getting in touch
Some details help us suggest the right survey and price. When you contact us, it’s useful to mention:
- Access details, such as a loft hatch or a shared roof
- Photos of the roof, taken safely from ground level or a window
- The property’s address and postcode
- What made you get in touch
Our phone lines are open seven days a week, including Saturdays and Sundays. To book or ask a question, phone 07833 053749 or drop us an email.
What a thermal roof survey looks like in Underhill
Historic houses such as Wyllyotts Manor, about 3.4 miles north, show how far back building in the area around Underhill goes. Period homes nearby can have lead valleys, tall chimneys and a patchwork of past repairs, and any change of roofing material on a listed home needs checking with the council first. If your survey includes the drone, the flight is checked against the Drone Safety Map first.
Take an older house close to St John the Baptist Church: steep roofs, tall chimneys and hidden valleys can be hard to see from the ground, and that is where a view from above or with a thermal imager helps. Controlled parking zones are common in London, so mention any permit rules for Underhill.
Underhill is about 1 mile west of Barnet, in Greater London. Underhill is one of many places we visit across Greater London. Across Greater London, we cover Underhill. We also survey roofs in London.
Postcode districts we cover here for thermal roof surveys: EN5 and N20. Whether your property is on Park Road, May's Lane and Manor Road or anywhere close by, we can help. Neighbouring places we cover for thermal roof surveys include Barnet (1 mile east), New Barnet (1 mile east), Monken Hadley (1 mile north), Hadley Wood (1 mile north-east) and Cockfosters (2 miles east). We also work in nearby towns like London (11 miles south-east), City of Westminster (9 miles south), Marylebone (9 miles south), Kensington (10 miles south), St Pancras (9 miles south) and Shoreditch (10 miles south-east).
Local landmarks in Underhill
Around Underhill, our work takes us to homes and buildings near Susi Earnshaw Theatre School, Highlands Gardens and The Red Lion pub and the streets around them. The nearest railway station is New Barnet station, roughly 1 mile east of the centre. Nearby you’ll also find Francis Skaryna Belarusian Library and Museum (2.2 miles south) and Barnet General Hospital (0.9 miles west). Green spaces nearby include Greenhill Gardens and Darland's Lake.
Tips that help
Most of what helps is simple and safe from ground level. Our suggestions:
- Heat the home normally on the days before
- Don’t climb onto the roof to look for leaks yourself
- Let us know where and when you’ve seen damp or stains
- Keep dated photos of any marks on ceilings
We note the weather and surface conditions, and how they may have affected the results. That way you know how much weight to give each finding.
After repairs or a new covering, a later survey can confirm things are dry in suitable weather.
When to book a survey in Underhill
Some buyers want extra detail before they commit to a purchase. A Premium Survey adds thermal imaging, a drone inspection where it applies and a same-day report, which suits a purchase that is moving quickly.
Common reasons to book include:
- Water getting in at parapets and stacks
- Leaks that are hard to trace
- Missing or slipped insulation
- Stains that keep coming back
Shop and office owners around Spires Shopping Centre may find that large commercial roofs are often easiest to see from above or with a thermal imager.
Before you book any roof surveyor
- Whether VAT is in the quoted price
- Is there a chance to talk the report through?
- If they fly a drone, whether they hold a CAA Flyer ID and Operator ID
- How much experience they have with roofs like yours