Bid
A contractor's formal, priced proposal to perform the work described in a set of plans and specifications, the document an owner uses to compare contractors and choose who gets the project.
Why it matters
It's the moment a design on paper turns into an actual number and a commitment. A bid that's rushed or missing scope can lock a contractor into a price that doesn't cover the real cost of the work.
On a real project
Three general contractors each submit a sealed bid for a new warehouse project. The owner opens all three on the same day and compares not just the price, but each contractor's proposed schedule and qualifications.
Who this matters most to
An Estimator builds the bid from the ground up, pricing every trade, material, and piece of equipment the job will need. A Senior Estimator typically reviews the final number before it goes out, since a bid mistake can't be undone once it's submitted and accepted.
Where this goes wrong
An estimator misses an entire scope item, say, site utility work, while assembling a bid under a tight deadline. The bid comes in low and wins the project, but the contractor then has to either eat the cost of the missed scope or fight an uphill battle to get it added later as a change order, since the omission was their own mistake.