Estimators and pre-construction managers at a general contractor run this phase. They price each design stage and track the budget.
Subs get pulled in early on some jobs. A mechanical sub may give budget pricing and design advice before the drawings are complete.
Early pricing is a budget, not a bid. Name the drawing set and date you used. Update the number when a new set comes out.
Ask how the GC will award the work. Early help does not always mean you get the job.