FAR Part 43 covers contract modifications. Defines bilateral modifications, unilateral modifications, and change orders. Specifies when each type is appropriate.
is a regulation concept federal contractors and grant writers run into across solicitations, regulations, and award filings
FAR Part 43 is part of the federal regulatory framework that governs procurement, performance, or compliance. For contractors, FAR Part 43 is not just background — it shapes solicitation language, evaluation criteria, source-selection authority, and what counts as compliant performance. Understanding when FAR Part 43 applies and (more importantly) when it doesn't apply is the difference between a proposal that's competitive within its actual constraint set and one that over-engineers compliance. Contracting officers use FAR Part 43 as common vocabulary, so reading their decisions, modifications, and source-selection memoranda gets easier when the regulation is in your working memory. Pair FAR Part 43 with the related terms above to see how it interacts with adjacent regulatory mechanisms.
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