Commercial Roof Inspection Cost Calculator
By the square foot, with the minimum call-out that decides the price on anything small.
Inspection cost
$800.00
- Minimum call-out (metered would be $400.00)
- $450.00
- Report, travel and patching
- $350.00
- All-in per sq ft
- $0.08/sq ft
Many manufacturer warranties require documented inspections at a stated interval, and can be voided without them.
Inspection says replace? Price the roof →
How this is calculated
metered = area or cores × rate work = the greater of metered and the minimum extras = report + travel + core patching total = (work + extras) × (1 + contingency%)
The minimum call-out is the part that catches people out. At four cents a foot, a 5,000 square foot roof meters at $200, which does not cover getting a qualified inspector onto it with a report at the end. Below the crossover the rate per foot stops meaning anything and you are simply paying the minimum, which is why quotes on small roofs look so expensive per foot and why the panel says when that is what is happening.
Contingency defaults to zero here, unlike the repair pages on this site. An inspection is a fixed scope with a known deliverable — nothing is discovered mid-job that changes its price, because discovering things is the job. What the inspection finds may cost a great deal, but that is the next quote, not this one.
Cost by survey type
| Survey | Rate | 10,000 sq ft | 50,000 sq ft | What it finds |
|---|---|---|---|---|
| Visual inspection | $0.04/sq ft | $800.00 | $2,350.00 | Surface damage, flashing, drains, seams |
| Drone survey | $0.06/sq ft | $950.00 | $3,350.00 | The same, plus safe access to steep or fragile roofs |
| Infrared moisture scan | $0.12/sq ft | $1,800.00 | $6,600.00 | Wet insulation under an intact membrane |
Figures include a $350 report, a $450 minimum and the after-hours premium infrared carries. The last column is the one that matters for choosing: a visual survey and a drone survey see the same things by different means, while infrared answers a completely different question. A roof can pass a visual inspection and still have thousands of square feet of saturated insulation under an intact membrane.
Frequently asked questions
How much does a commercial roof inspection cost?
A visual survey typically runs $0.03 to $0.06 per square foot with a minimum call-out of $300 to $600, so a 20,000 square foot roof lands around $800 to $1,200. Infrared moisture scanning costs two to three times that per foot because it takes a night visit and specialist equipment. Core sampling is priced per core rather than by area.
What does an infrared scan find that a visual inspection does not?
Wet insulation under an intact membrane. Trapped moisture holds heat longer than dry insulation, so after sunset a thermal camera shows the saturated areas glowing against the cold roof. Nothing about that is visible from the surface, which is why a roof can pass a visual inspection and still need a large section of insulation replaced. It is the difference between finding leaks and finding the damage they have already done.
Why is the scan done at night?
Because it relies on the roof cooling faster than the wet areas do. During the day everything is hot and the contrast disappears, so the survey window is a few hours after sunset on a dry day with no recent rain. That constraint is most of why infrared costs more: it is specialist equipment, out-of-hours labor, and a job that gets postponed by weather.
How often should a commercial roof be inspected?
Twice a year is the common recommendation, typically spring and fall, plus after any major storm. Many manufacturer warranties require documented inspections at a stated interval and can be voided without them, which often makes the inspection cheaper than the warranty it protects. Budget it as recurring maintenance rather than as a response to a leak.
Do I need core samples?
Core sampling is how you find out what is actually in the assembly — how many layers, what insulation, whether it is wet — and it is usually reserved for planning a replacement or settling a dispute. Each core is a small hole that has to be patched, so it is a destructive test done in a handful of places, guided by what an infrared scan flagged rather than at random.
Should the inspection come from the roofing contractor?
It is cheaper and often fine for routine maintenance. For a purchase, an insurance claim, a warranty dispute or a replacement decision, an independent consultant who is not bidding the repair is worth the extra, for the same reason an independent engineer is worth it on a foundation. Whoever writes the report should not be the one selling the solution it recommends.
Results are planning estimates built from typical price ranges, not quotes. Rates vary by region, roof access and building height, and infrared surveys depend on weather and on a narrow window after sunset. For a purchase, a claim or a warranty dispute, prefer an independent consultant who is not bidding the repair the report recommends.