The cost to hire a roof inspector depends on a few key factors, but the average roof inspection cost is $617 with most roofing inspections ranging in price from $488 to $746.National Hire a Roof Inspector Costs.ost to Hire a Roof Inspector. The roof of a home is an essential part of the building's structure. Not only does the roof protect everything inside the home, but it also helps protect the walls and foundation from the ravages of rain, ice, snow and wind.