Price the actual scope by trade and phase. A broad labor percentage is useful only as a cross-check after the work is defined.
Build labor from the sequence
List tasks in construction order, assign crew size and productive hours, include mobilization and handoffs, and apply the true loaded hourly cost.
Price the constraints
Occupied homes, upper floors, limited parking, short work windows, long haul paths, protection, dust control, and one-bathroom schedules all affect productivity.
Separate allowances and unknowns
Use allowances for undecided selections and explicit contingencies or unit prices for concealed conditions. Describe what evidence triggers a change order.