Quick Answer: A Calgary commercial roof inspection is a structured assessment of the membrane, flashings, drainage, and structural integrity of a flat or low-slope roofing system, typically priced at $0.05 to $0.15 per square foot or $400 to $2,500 flat for buildings under 50,000 sq ft. Best practice in Calgary is twice yearly (spring and fall) plus event-driven inspections after any major hail or wind storm. The written report becomes the basis for insurance compliance, cape