definitive study on design-build cost effectiveness
is Project Delivery Systems: CM at Risk, Design-Build,
Design-Bid-Build (Construction Industry Institute
Research Report 133-11, April 1998).
Authors Victor Sanvido and Mark Konchar analyze
survey data from 351 construction projects. The
authors concluded that the design-build performance
compared favorably to the design-bid-build performance;
the unit cost was six per cent less, construction
time was 12 percent faster, and project time (design
and construction) was 33 percent faster.