Question answered
Commercial roof condition surveys
The short answer
A commercial roof condition survey inspects the covering, laps, fixings, rooflights, gutters, flashings, penetrations and drainage, records the findings with photographs and says what needs repair, what can wait and what has reached the end. Published UK guides give roof inspections from £150 to £500, depending on method and size.
A condition survey tells you what state a commercial roof is in, where it is failing and what it needs now. It turns a vague worry about the roof into photographs and a decision.
What the survey looks at
The covering comes first: sheets, membrane or felt, with attention to laps, fixings, splits, blisters and ponding. Each sheet joint and fixing line is looked at for movement, rust and missing washers. Next come the details where roofs usually fail, such as upstands, parapets, flashings, pipe penetrations, plant bases and the edges of rooflights. Then the drainage: outlets, gutters, downpipes and any overflow.
Looking up from the floor, the roof lining shows stains, daylight where there should be none, rusted fixings and wet insulation, all of which tell you things the top surface hides. The survey also records previous repairs, because a patchwork of patches points to a roof that has been leaking more often than anyone has mentioned, and it notes whether any earlier fix was only cosmetic. The notes include a safe route across the roof, which matters most where fragile roof areas are present, and which areas nobody should walk on at all.
Methods: on foot, by drone and by thermal image
A survey can be done on the roof, from inside, from a platform or by drone. MyBuilder's inspection guide lists drone surveys and thermal surveys alongside standard inspections, and a drone is useful where a roof is fragile or hard to reach because nobody has to walk on it.
Thermal imaging picks up temperature differences that may point to wet insulation, though it is a clue to be confirmed on site and not a verdict. The method is chosen to fit the roof, and the safest approach that answers the question is the right one. Where a roof is too fragile to walk on, the survey is done from below and from a safe edge or platform, and anything that could not be seen is recorded as such, so the gaps in the report are plain to the reader.
Typical UK costs for inspections
MyBuilder's roof inspection guide, updated 21 August 2026, gives a typical UK range of £150 to £500. Within that it shows standard inspections at £150 to £250, drone surveys at £200 to £400 and thermal surveys at £300 to £500. These are national figures, and a large industrial roof or a complicated site can sit above them.
What moves the price is how big the roof is, how hard it is to reach, whether a drone or thermal camera is used and how much reporting you need. If repairs follow, the quote for them is written and arrives as one overall sum, so you decide on facts. A condition report on its own is worth having before a lease is signed or a building is sold, and it sits well alongside our page on the lifespan of a commercial roof.
What you should receive
You should receive photographs of your own roof, each tied to a location and a finding, with a written summary in plain language and a simple plan or sketch marking where each photograph was taken, so that anyone can return to the same spot. It should separate what needs doing now, what should be watched and what is sound. A report that says only that the roof is poor, without showing where, is of little use to you or to an insurer.
From there the options are set out as repair, overlay or replacement, each with its reasons, and the lightest option that properly cures the fault is the one put forward first. If the roof could carry something new while it is being worked on, such as a planted roof, the survey records what the structure would have to bear; read about a commercial green roof before you decide, and ask a structural engineer, as the Planning Portal advises where a heavier covering is proposed.
When to arrange a survey
Common triggers are a leak, a storm, a purchase or lease, a planned sale, a question from an insurer, or a roof that is simply old. A survey after a storm gives you dated evidence, and one before winter finds problems while they can still be mended in decent weather. Buyers and lenders, and incoming tenants with a repairing lease, often ask for exactly this kind of record, so a report prepared early can save a delay later in the transaction.
If the building stays open, the visit can usually be arranged around your trading hours, and roof work while the business stays open explains how repairs are managed afterwards. Where sheets look worn, replacing a damaged roof sheet shows what comes next. Send us a few photographs and the address, with the roof's approximate age if you have it, and say whether the building is occupied in the day, through ourcommercial roofing service page.
Roof surveys: two more questions
Can a survey be done without anyone walking on the roof?
Yes, in many cases. A drone, a platform or an inspection from inside can show most of what matters, and it is the safer choice on a fragile roof. The report records anything that could not be inspected so that the gaps are clear.
Is a condition survey the same as a quote for repairs?
No. The survey records the condition and its causes; the quote follows from it and prices the work as one total. Keeping the two apart means the findings do not depend on whether you go ahead, and you can use the report for your insurer, landlord or buyer.
Tell us about your roof
Describe what is happening and we will call you back to arrange a visit.
- Photographs of what we find
- A written quote with one total price
- Or call 01903 299063
10-year workmanship guarantee, in writing.