The advantages of design-build over traditional design bid build procurement have been documented by a Penn State study.

The results of this study are summarized in the table below.  Overall, design-build is faster and less expensive than traditional design bid build:

Metric Design-Build vs. Design Bid Build
Unit Cost 6.1% lower
Construction Speed 12% faster
Delivery Speed 33.5% faster
Cost Growth 5.2% less
Schedule Growth 11.4% less

 

In comparing a typical project schedule for both methods, the reason for design-build being so much more advantageous than traditional design bid build procurement is apparent: