What did this site earn?
That is the question a managing director asks every month. In Lean, the answer sits on the project itself: what you budgeted in the quote, and what it actually became. Revenue, cost and margin, per cost type.
More importantly: why the margin changed. Was it the purchase price, extra materials, extra hours? And what did the extra work bring in? Each cause is shown separately, so you know where to price differently next time.
Because the purchase price is kept on every purchase line, you see a price rise at the moment you order, not only at the final account.