contracts
addendum
An addendum is a document attached to and made part of a contract that adds terms or information not covered in the main form, such as a lead-based paint disclosure, a home sale contingency, or seller financing terms. When signed by the parties, it becomes part of the agreement. An amendment, by contrast, changes terms already in the existing contract.
- Exam tip
- Addendum adds new terms; amendment changes existing terms. Both generally must be in writing and signed to be binding.
- Example
- Buyers and sellers sign an addendum to their purchase agreement allowing the sellers to rent back the home for 30 days after closing.
Related terms & state variants
Sources
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Last verified: 2026-10-23