Terms of an addenda could impact the scope of work, project schedule, or costs.

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Addenda introduce changes after contract documents are issued, and these changes can affect what work is included, when it is to be done, and how much it costs. If new work is added or existing work is removed, the scope changes. Revisions often require adjustment of the project schedule to accommodate the new tasks, sequencing, or procurement lead times. They can also change costs through added or removed quantities, updated unit rates, or price adjustments. Sometimes an addendum clarifies ambiguous requirements, which can lead to schedule delays or cost implications due to rework or additional approvals. Because addenda can influence all three areas, the most accurate statement is that they could impact the scope of work, the project schedule, and costs. While some addenda might seem to affect only one aspect, it’s common for changes to ripple through multiple parts of the project.