Major benefits of using drones in construction

The construction industry is booming rapidly and the role of technology is increasing at every level. It is expected that, in the next 10 years, the use of drones in construction will register a manifold growth. These are the major benefits of using drones in construction.
Drones would lower the costs of projects and increase productivity.
Use of drones will create new jobs and add value to the construction sector.
Drones can fly in inaccessible and hazardous areas and collect data easily.
Drones provide real-time information, leading to significant improvement in surveying accuracy.
Drones give professionals easier access to data across different departments.
Insurance cost of drones is low compared to on-site workers.
Drones are fast and capable of completing an inspection in less than 15 minutes.
Drones provide enhanced data sets through improvements in photographic visualization.

[@govindabhutada5730]

Can you please sepcify how would it lower project costs and by how much percentage?