Hertfordshire · London and the South East
Thermal Roof Survey in Leavesden
Independent thermal roof surveys in Leavesden. More than 5,000 surveys completed across London and South East England.
- Water that travels before it shows
- Possible trapped moisture under a flat roof covering
- Damp that repairs haven’t cured
Thermal roof survey in Leavesden: what you get
On a flat roof, wet insulation holds heat longer than dry insulation. That means a wet area can show up as a different temperature from the rest of the roof. It helps us see how far water may have spread under the covering, which is hard to judge by eye. We then check those areas with moisture readings. If you are worried about cold spots on ceilings under the roof and possible trapped moisture under a flat roof covering, we can find out what’s behind it.
Places like Leavesden can be near small airfields or other airspace restrictions, so the Drone Safety Map is checked before any flight. Exposed sites can be windy, and a small drone can’t fly safely in strong wind. Each flight is planned with neighbours’ privacy in mind, as well as the airspace and the wind.
The Standard Survey adds moisture detection, a structural check and a follow-up consultation. The Premium Survey goes further, with thermal imaging, drone inspection where applicable, structural analysis and an in-person consultation.
- Where
- Leavesden (WD25, WD5)
- Wider area
- Hertfordshire
- Price
- From £400 inc. VAT
- Reports
- A written report with photos, by email
- When we survey
- Monday to Sunday, daytime
- Insured
- PI and public liability insurance
- Telephone
- 07833 053749
- Page updated
- 27 October 2026
Common roof problems in Leavesden
After a long-running leak, insulation under a flat roof can stay wet. Owners want to know how far it has spread before deciding what to do. A thermal survey, checked with moisture readings, can give a much clearer picture.
It’s worth booking a survey if you’ve seen:
- Moisture around outlets and upstands
- Cold areas below the roof
- Areas of a flat roof that may hold water
- Leaks that are hard to trace
For businesses in and around places such as Charter Place, big, flat commercial roofs are where aerial photos and thermal images help most.
Before you book anyone
- Whether they hold professional indemnity and public liability insurance
- What the report includes, and whether it has photographs
- Is there a chance to talk the report through?
- Whether the inside of the roof is included
How the survey changes by roof type
Single-ply and EPDM roofs
Single-ply PVC, TPO and EPDM roofs are often laid over insulation boards. Wet boards can show as temperature differences on the images.
Parapets, valleys and junctions
When valley or parapet gutters overflow, water can get into walls and ceilings. We use the camera and moisture readings to help follow it.
Landlords, agents and block managers in Leavesden
We survey roofs for letting agents and landlords as well as homeowners. A report with photos gives you a clear record of the roof, which helps you plan work between tenancies.
Freeholders and residents’ companies use a roof report to plan and budget, with the most urgent items set out first.
What this survey cannot tell you
Without opening up the roof, some things stay hidden, so a survey has limits:
- Confirming water without moisture readings
- Whether the deck or roof structure is strong enough
- Readings unaffected by sun, shade or reflections
If in doubt, call 07833 053749 or use the contact form and we’ll recommend the right survey. What our survey covers.
Roofs we survey in Leavesden
- Flat roofs
- Insulated roof spaces
- Ceilings below the roof
- Loft conversions
- Pitched roof slopes
- Commercial roofs
Drones, thermal imaging and Leavesden roofs
High Elms Manor, about 0.4 miles north-east, is one of the historic houses in the wider area around Leavesden. If your house is among the older ones, expect a mix of original materials and later repairs on the roof, and the council can say whether a home is in a conservation area. Where the drone is part of the survey, we check the Drone Safety Map for restrictions before flying.
If you own one of the older houses in the streets near Church of All Saints, older roofs can be steep and hard to see from the street, which is where photos from the air and thermal images help. Take a building like Alban Wood Primary School and Nursery: big roofs are where photos from the air and thermal images show the most at once.
Leavesden is about 2 miles north of Watford, in Hertfordshire. Whether the building in Leavesden is a house, a flat or a commercial unit, we can survey the roof. Across Hertfordshire, we cover Leavesden. We also survey roofs in London.
Thermal roof surveys in WD25 and WD5 work the same way as everywhere else we cover. Local streets include Forest Road, Langley Lane and Sheepcot Lane. With the A405 close by, Leavesden is simple for us to get to for thermal roof surveys. Nearby, we also carry out thermal roof surveys in Garston (1 mile south-east), Meriden (1 mile south-east), North Watford (2 miles south), Watford (2 miles south) and Aldenham (2 miles south-east). Further out, we also cover Hemel Hempstead (5 miles north-west), St Albans (5 miles north-east), Welwyn Garden City (11 miles north-east), Harpenden (9 miles north), Cheshunt (15 miles east) and Hatfield (8 miles north-east).
Landmarks near Leavesden
Typical jobs here are in homes near Woodside Playing Fields and Francis Combe Academy. Leavesden’s nearest station is Garston station, about 1 mile south-east. Well-known places in the area include Hertfordshire Fire Brigade Museum (3.1 miles south) and Hilfield Castle (4.1 miles south-east). For a walk, there’s Longspring Wood and Verulamium Lake.
Tips that help
Over many surveys, some simple habits stand out:
- Tell us where and when you’ve seen damp or stains
- Clear leaves from outlets and gutters each autumn
- Keep the report to compare against after any repair
- Don’t switch the heating off ahead of the visit
The report explains the conditions on the day and how they affected the images. That way you know how much weight to give each finding.
Deal with small splits and lifted seams promptly. Once water gets under a membrane, it can travel far before it appears inside.
What else we do in Leavesden
The survey, step by step
After the inspection, everything we found is written up in a report with photographs, emailed to you. On timing, it usually takes an hour or two for most homes, plus time to check any thermal findings with moisture readings. A visit to a smaller place like Leavesden is no different on the day: outside, inside and from any safe vantage point, in that order. It helps to show us anything you’ve already noticed.
- You tell us about the roof and any damp, leaks or cold rooms.
- We check the conditions and note how they may affect the images.
- A full inspection and thermal imaging are carried out together.
- Moisture readings are used to check what the camera shows.
- The Premium report reaches you the same day, and we go through it with you in person.
How to prepare
- For a flat or shared roof, check access with the freeholder or managing agent
- Check pets are kept safely away
- Show us where any leaks or stains appear
Getting a price
Our phone lines are open seven days a week, including Saturdays and Sundays. For a price or to book, call 07833 053749 or email us.
Related advice
Leavesden: your questions answered
Is Leavesden in the area you cover?
Yes, Leavesden is within the area we cover. We cover the whole of London and South East England. Just phone 07833 053749 or drop us an email and let us know about the property.
Do you cover smaller places like Leavesden?
Yes. Leavesden is within the area we cover, which takes in towns, villages and rural addresses. Our area covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is thermal imaging included in your surveys?
It comes with our Premium Survey, which starts from £400. That also includes a full inspection, a drone inspection where applicable, structural analysis and a same-day report.
Do you take photos of the roof?
Yes. We photograph the roof as we go, and the report uses them to show each finding.
Will you go up on the roof?
Not always. Some roofs are too steep or fragile to walk on safely. Safe viewpoints, the loft and a drone where applicable let us see the rest.
What do I do with the report?
You receive the written report by email, with photographs and recommendations. You can use it to talk to a seller, an insurer, a roofer or a managing agent, whichever applies.
Can you give me structural calculations?
No. We’re roof surveyors, not structural engineers. If we see signs that need an engineer’s opinion, we will recommend one.