Addendum

A revision to the bid documents issued after the initial bid set, typically late in the bid period.

An addendum is a formal revision to construction bid documents issued by the architect or owner before bid day. Addenda can change quantities, specifications, scope, schedule, or any other aspect of the project.

Bids must reflect all addenda issued through the deadline. A bid that misses the latest addendum is non-responsive and may be disqualified.

Addenda often arrive in the final 24–48 hours before bid day, putting estimators under pressure to re-price scope.

Always note in your scope letter which addenda you've accounted for ("This bid is based on plans dated [Date] with addenda 1 through 4 inclusive.").

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