Kept margin is the measure.

A win rate rewards the bids you priced cheapest, and says nothing about whether the work paid. Every job your firm closes out reports two numbers side by side instead: the margin it was bid at, and the margin it actually realised — measured from the same record the job was run on, so the comparison exists on the day the job closes rather than a quarter after it.

Sorted by owner, delivery method and trade, the pattern is usually blunt. One owner's work keeps 0.94× of the margin it is bid at; another's keeps 0.61× and has done for three years — and the wins were never the problem. Estimating capacity is the scarcest thing in a precon office, and this is the number that should decide where it goes. Where a category holds too few closed jobs to say anything, it reports the thinness instead of scoring it.