In commercial and construction procurements, an addendum is an issued change or clarification to the solicitation documents.
Functionally similar to a federal amendment, it provides updates to drawings, specifications, schedules, and instructions. Bidders
must acknowledge and incorporate addenda into their proposals or bids. Failure to do so can render a submission nonresponsive.
Addenda often answer bidder questions, fix inconsistencies, or reflect site visit outcomes. Teams should track addenda carefully,
re-run requirement shredding, and update estimates and schedules as necessary. In hybrid public-private projects, both federal
“amendments” and commercial “addenda” concepts may appear; maintaining a unified change log reduces confusion.
- Procurement & RFP Basics
Addendum (Commercial)
Buyer-issued changes or clarifications commonly used in commercial solicitations and construction.
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Related Glossary Terms
Buyer-issued changes or clarifications commonly used in commercial solicitations and construction.
A formal change to a solicitation that must be acknowledged by offerors to remain compliant.
The formal notice and package (RFP/RFQ) through which a buyer requests offers from vendors.
Formal vendor questions submitted to resolve ambiguities or conflicts in the solicitation.