few companies bid anything out anymore unless they are forced too. usually a negotiated price works out better for everyone but is really hard to do on public contracts.
Public school districts and the like hire Construction Managers (really big GC's with their own CM company), then do several rounds of budgeting with their favorite subs...usually only 4 or 5 five of their best in each discipline.
Then when drawings are 100% it's hard-bid time. As a sub, I love it. Very limited competition......