Contractors suggest modifications to simplify the build and cut costs, including the fabrication of components off-site improving quality and simplifying scheduling.
Errors, copying data from architects designs and reiterative modifications made by structural or service engineers are avoided. Clashes between services are flagged automatically and remedial action can then be taken at the design stage.
Models can be produced from a 3D printer, allowing the client to make informed decisions without the need to understand plans.
A full energy audit, for the whole life cycle, can be performed on the building before it leaves the modeling stage, improving sustainability and providing information for when the building needs to be recycled or modified.
This is all made easier by 'Cloud' computing allowing collaborative working on a remote server.
The client, as the financer of the project should have overall control of the BIM although they may delegate to the architect, project manager or even a specialist BIM manager.