Any thoughts on this for a smallish jobs (say <300K house alts).
My thought for a recent job was that because the programme was very specific and tight, get a builder involved as early as possible, one that you know and have worked with, and that the client likes. Get an estimate at the end of DD. If that is reasonable, document while seeking their input, involvement, cost advice, and commitment to the programme. If the price is right, which it should be, build it on time because they should have booked it in. The higher certainty / lower adversity way to do it. If you've got the right builder.
The other way is a competitive tender. Clients can be keen for this because it could nab them a bargain. My office finds it a great deal harder to keep builders interested through a competitive tender process, and recently we've had cases where they've all dropped out or submitted joke prices because they're busy, killing the project stone dead.
So, method one requires trust, method two is adversarial from the outset, but could save the client some dollars.
If you're in the biz, what is the point at which you would switch to competitive tender, and why?