Commercial roof surveys and maintenance
Condition surveys · drone and moisture surveys · planned maintenance
A roof condition survey tells you what the roof is, what state it is in and what it will need, with photographs and a budget. Published prices for a full survey of a smaller roof run £250 to £400, a drone survey £200 to £350 and a thermal or moisture scan £300 to £500. Large or multi-building estates cost more.
Planned maintenance, usually one or two visits a year, keeps outlets clear and catches defects while they are still cheap.
When to commission a survey
Before buying, leasing or ending a lease
A roof is one of the biggest items in a dilapidations claim. Know its condition before you sign or hand back.
Before setting a capital budget
A survey with a five or ten year plan turns roof spending from emergencies into a schedule.
Before solar panels go on
An array lasts 25 years or more. The roof under it needs to last as long, and carry the load.
After a storm or repeated leaks
To find out whether there is one problem or many.
Typical survey and maintenance costs
| Item | Scope | Typical cost |
|---|---|---|
| Full roof survey | Smaller roof, written report with photographs | £250 to £400 |
| Drone survey | Photographs of the whole roof without walking on it | £200 to £350 |
| Thermal or moisture scan | Finds wet insulation under a flat roof | £300 to £500 |
| Maintenance visit | Outlets cleared, defects logged, small repairs | From a day rate |
| Large estate or portfolio | Several roofs, one report and plan | Per job |
Budget figures read from national price guides and roofers' own published rates in November 2026, shown before VAT. Use them to plan; the contractor's written price is what counts. Work out a budget for your roof.
What a good roof report contains
The roof, described
Construction, system, approximate age, area, falls, outlets, rooflights, plant and access. Many facilities teams do not have this written down, and every later quote depends on it.
Defects, graded
Each defect located on a plan, photographed and graded by urgency, with the likely cause. A common grading runs from serviceable through defects needing attention to major refurbishment and end of life, as on the condition card on our home page.
Cores and moisture
On flat roofs, small cores cut through the covering show the build-up and whether the insulation is wet. Thermal imaging or electrical moisture surveys map wet areas across the roof. This is what decides whether a roof can be overlaid or must be stripped.
Safety on the roof
The surveyor should say how they will access the roof and how they will stay off fragile surfaces. HSE guidance is to treat every roof as fragile until a competent person has confirmed it is not; rooflights and fibre cement sheets are the classic hazards. A drone avoids walking on a roof that is not safe to walk on.
A budget plan
What to do now, in two to three years and in five to ten, with costs. That plan is what makes a survey worth paying for.
Where our information comes from
Prices are typical ranges from published UK contractor price guides and roofing firms' price pages, November 2026.
Need a roof surveyed or a maintenance contract? Get a surveyor or contractor in your area to price it.
Get contractor quotesHow the job runs
From instruction to report.
Brief
The building, its use, any drawings and past reports, and what the survey is for: a purchase, a lease, a budget or a problem.
Access plan
How the surveyor gets onto the roof safely, or whether a drone is used.
Survey on site
Visual inspection, cores and moisture readings, photographs and measurements.
Report and plan
Graded defects, recommendations and a budget, usually within a couple of weeks.
Survey and maintenance questions
How much does a commercial roof survey cost?
- Published prices for a full survey of a smaller roof are £250 to £400, a drone survey £200 to £350 and a thermal or moisture scan £300 to £500. These come from domestic-scale price guides: a large warehouse, a school or a portfolio of buildings is priced per job.
How often should a commercial roof be inspected?
- Twice a year is the usual advice, in spring and autumn, with outlets and gutters cleared each time, plus a check after any major storm. Many maker guarantees require periodic inspections to stay valid.
Is a drone survey as good as walking the roof?
- For seeing and recording the whole roof, often better, and it keeps people off fragile surfaces. It cannot take cores or feel a soft deck, so on flat roofs a drone is usually combined with cores at chosen points.
What is a roof condition survey?
- A written report of a roof's construction, condition and defects, with photographs, graded recommendations and usually a budget. It is the document every later decision and quote is based on.
Does a maintenance contract pay for itself?
- Blocked outlets and failed flashings cause a large share of commercial roof leaks, and both are cheap to deal with on a routine visit. Catching them early also protects any manufacturer guarantee that requires maintenance.
Read next
- Commercial roof repair
When the survey finds defects.
- Commercial roof refurbishment
When the survey says overlay.
- Commercial roof replacement
When the survey says strip.
- Commercial roof cost calculator
Turn the report into a budget.
Get a roof survey priced
Three short steps. The postcode, what the roof is and what it is doing is enough to start. A contractor confirms the detail on a survey.
Your request stays with us until you approve the independent commercial roofing contractor we put forward for your building.
Received. Here is what happens next.
- We look for an independent commercial roofing contractor who covers your area and takes on roofs like yours, then email or phone you with their name.
- Nothing goes to them until you say yes.
- If you agree, they arrange a survey and send a written price. No newsletters and no sales calls from us.