Quad copters are being used as a cost effective way for construction companyes to do everything from daily progress report photos to collecting data for 3D modeling work.
Read this article regarding how Rogers-O'Brien Construction, an Austin, Texas based construction company, uses unmanned aerial vehicles to enhance their business: http://www.forconstructionpros.com/article/12105250/how-drones-can-fly-construction-zones-profitably-and-legally.