Contingency
Money set aside in a budget, separate from the base contract price, specifically to cover unknown costs and risks that come up during construction, without needing a change order or a fight over who pays.
Why it matters
No estimate perfectly predicts everything a project will run into. Contingency is the buffer that keeps a normal, expected surprise, a bit of unexpected rock during excavation, say, from turning into a dispute over whose fault it was and who has to pay for it.
On a real project
A $5 million project budget includes an additional 5% contingency, $250,000, held separately, so a $30,000 unexpected soil condition doesn't have to become a fight over a change order; it's simply drawn from the contingency instead.
Who this matters most to
An Estimator sets the contingency amount during preconstruction, sizing it to how much uncertainty the project actually carries. A Project Manager manages it during construction, deciding what legitimately qualifies as a contingency draw versus what should instead go through a change order to the owner.
Where this goes wrong
A project manager treats the contingency fund as a general slush account, drawing from it to cover cost overruns that were actually the contractor's own estimating mistakes rather than genuine unknowns. By the time a real unexpected condition shows up mid- project, the contingency is already gone, and there's no clean way left to cover it.