FAR 43—Contract Modifications

Scope of part.

FAR 43.000 defines the scope of FAR Part 43, which is the government’s framework for preparing and processing contract modifications. It makes clear that the part applies broadly to all types of contracts, including construction contracts and architect-engineer contracts, so users should expect the modification rules in Part 43 to govern changes to contract terms, scope, price, schedule, or other contractual provisions. At the same time, it draws two important boundaries: it does not cover orders for supplies or services that do not otherwise change the terms of the underlying contract or agreement, such as delivery orders under indefinite-delivery contracts, and it does not cover modifications for extraordinary contractual relief, which are handled under FAR subpart 50.1. In practice, this section tells contracting officers and contractors where to look when a change is being made and, just as importantly, when Part 43 is not the right authority. That distinction matters because the legal effect, documentation, approval path, and procedural requirements can differ significantly depending on whether the action is a true contract modification, a routine order, or an extraordinary relief action.

Subpart 43.1

Subpart 43.2

Subpart 43.3