Hertfordshire · London and the South East
Thermal imaging roof survey in Lemsford, Hertfordshire
Get a clear view of the roof at a property in Lemsford from an independent roof surveyor. Visits run on weekdays and weekends, in the daytime.
- Ceilings that feel colder in places
- Leaks that are hard to trace
- Thin or uneven insulation in the roof
Thermal roof surveys around Lemsford
If the drone is used for your survey, we check the Drone Safety Map for restrictions before flying. Across the South East, older homes tend to have slate or clay tiles, and many later ones concrete tiles, with flat-roofed extensions, dormers and garages common everywhere. Many roofs like these can’t be judged properly from the pavement, and that is where a view from above or a thermal image earns its place.
Anyone responsible for a site like Applecroft School will know that a drone or thermal camera can show a large roof in a single visit. Historic houses such as Digswell House, about 1.9 miles north-east, show how far back building around Lemsford goes. Older roofs nearby can be steep and hard to see from the ground, and a survey from above or with a thermal imager does not touch the roof itself. If you look after a shop, office or commercial unit, for instance near Howard Centre, thermal images can show trapped moisture across a wide commercial roof.
Lemsford is about 2 miles west of Welwyn Garden City, in Hertfordshire. Lemsford is one of many places we visit across Hertfordshire, for houses, flats and commercial buildings. Lemsford is one of the places in Hertfordshire we cover. For surveys nearby, see our London page.
All of AL8 is covered for thermal roof surveys. If you need a thermal roof survey at a property on Mill Close, Lemsford Village and Great North Road or a nearby road, we can survey it. Nearby, we also carry out thermal roof surveys in Stanborough (1 mile south), Coleman Green (2 miles west), Cooper's Green (2 miles south-west), Hatfield (2 miles south) and Smallford (3 miles south-west). Within a short drive, we also cover Watford (12 miles south-west), Hemel Hempstead (10 miles west), Stevenage (8 miles north), St Albans (5 miles south-west), Harpenden (5 miles west) and Hitchin (11 miles north).
Around Lemsford
Around Lemsford, our work takes us to homes and buildings near Stanborough Park, Stanborough School and The Sun Inn, among other places. The closest station to Lemsford is Welwyn Garden City station, roughly 1.2 miles east. A little further out are Queen Elizabeth II Hospital (2.1 miles south-east) and The Bunker at Hatfield Police Station (2.1 miles south). Green spaces nearby include Lemsford Springs.
Thermal roof survey in Lemsford: what you get
We present each thermal image next to a normal photo of the same area, so it’s easy to see which part of the roof each one shows. Each one comes with an explanation, the moisture readings and our recommendation. With a Premium Survey, the report reaches you the same day. You can talk the findings through with us at the in-person consultation. A follow-up 12 months later is included too. We survey commercial roofs, loft conversions and pitched roof slopes, and people most often book us about damp around roof outlets and upstands and missing or slipped insulation.
Older buildings in small places like Lemsford may be listed or in a conservation area. Neither a drone survey nor a thermal survey involves any work on the roof, which suits a building where any change needs care, before anyone decides what work it needs. Check with the council before planning any work on a listed building or one in a conservation area.
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
- Lemsford (AL8)
- Region
- Hertfordshire
- Cost
- From £400 inc. VAT
- Your report
- Written, with photos, emailed to you
- Survey days
- Weekdays and weekends
- Insurance
- PI and public liability insurance
- Phone
- 07833 053749
- Updated
- 27 October 2026
Can I check my roof myself?
The one thing to avoid is getting up close. Slates, tiles, flat roofs and rooflights can give way, and falls from height are serious. That part is for a survey, using safe viewpoints and a drone where applicable.
Your own check is a good start, but it isn’t a survey. From the ground, valleys, flashings and the backs of chimneys are often out of sight.
What happens if roof problems are left?
Without thermal imaging, the only way to see how far water has spread is often to open up the roof. That helps you and your roofer decide what really needs replacing. For older village homes like those around Lemsford, the right replacement materials aren’t always easy to find quickly. Spotting a problem early leaves room to find them.
Thermal imaging and drone inspection (where applicable) come with the Premium Survey, which starts from £400, inc. VAT. We’ll tell you which package suits the questions you have.
Why book us in Lemsford
- Satisfaction rate of 98%
- Surveys seven days a week
- Covered by professional indemnity and public liability insurance
- Thermal imaging and drone inspection where they help
Take a look at how roof surveys are priced or our case studies.
Also near Lemsford
Also in Lemsford
What a thermal roof survey does not cover
A survey is a proper look at the roof, but it cannot do everything. The main limits are:
- Proving moisture from the images alone
- An energy rating for the building
- A structural engineer’s assessment
If you’re not sure which survey you need, phone 07833 053749 or drop us an email and we’ll give you a straight answer. The full list of what we check.
What we look at
- Flat roofs
- Ceilings below the roof
- Commercial roofs
- Loft conversions
- Pitched roof slopes
- Insulated roof spaces
Before and after the survey
From years of surveys, a few habits stand out:
- Check from the ground or a window, never by climbing
- Take photos of stains as they appear, so we can compare
- Keep the heating on as usual before a heat loss survey
- Keep the report to compare against after any repair
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.
Have small defects in the covering fixed early. Once water gets under a membrane, it can travel far before it appears inside.
How we price thermal roof surveys
A few things affect what a survey costs:
- House, block, shop or office
- Roof area
- Extra roofs, like extensions, dormers or garages
- Features like valleys, chimneys, dormers and parapets
Prices start from £400, including VAT. Basic starts from £150, Standard from £250 and Premium from £400, VAT included.
What to tell us when you contact us
To price your survey accurately, we will ask about:
- Whether there’s a loft hatch, a shared roof or tricky access
- The kind of building and roof involved
- Any marks or damp showing indoors
- Your postcode, so we can check access and travel
We confirm the price for the job before booking, so you know the cost up front. Our price is from £400, including VAT. To book, call 07833 053749 or send us an email.
How the survey works
Time on site depends on the size and shape of the roof; as a rough guide, the survey takes between one and two hours for most homes, plus time to check any thermal findings with moisture readings. You’re welcome to ask questions while we’re there. For a village or hamlet like Lemsford, the journey is planned ahead of time: tell us about narrow lanes, gates, long drives and where we can park. On the day, we inspect what can be seen safely, inside and out.
- 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.
- We inspect the roof and take thermal images during the same visit.
- Moisture readings are used to check what the camera shows.
- You get the report the same day, with an in-person consultation to follow.
How to prepare
- Have any questions written down, so nothing gets missed
- Leave side gates unlocked
- Make sure pets are kept safely away
Getting a price
To arrange a survey, phone 07833 053749 or email us with the address and what you’d like to know about the roof. We’ll confirm the price before booking.
Advice
Your questions about thermal roof surveys in Lemsford
How do I find out if my home in Lemsford is listed?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. If a home is listed, changes that affect its special interest need listed building consent, and in a conservation area re-roofing in different materials may need permission.
Do you cover smaller places like Lemsford?
Yes, Lemsford is on our map. A small place gets exactly the same survey as a big one, with the route planned beforehand.
How long does the survey take?
That depends on the size and shape of the roof, but most surveys take an hour or two for most homes, plus time to check any thermal findings with moisture readings. The written report follows by email.
Do you climb onto every roof?
Not always. Safety comes first, and fragile or steep roofs can’t always be walked on. Safe viewpoints, the loft and a drone where it applies let us see the rest, and the report records anything we couldn’t see.
What will the report tell me?
It works through the roof part by part, in writing and with photos. Points are put in order of urgency where relevant.
Can a thermal camera see water?
Thermal imaging shows temperature rather than water. Because wet insulation holds heat for longer, it can show as a different temperature, and moisture readings are used to check it.
Can you give me structural calculations?
No. We note visible signs such as sagging or deflection, but we do not carry out calculations or give an engineer’s opinion. Where an engineer is needed, we say so in the report.