Addendum

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An addendum is a document added to your purchase agreement that introduces new terms or conditions — it becomes part of the original contract once…

An addendum is a document added to your purchase agreement that introduces new terms or conditions — it becomes part of the original contract once both parties sign it.

Think of it as an attachment to your contract. The original purchase agreement covers the basics, but sometimes you need to add something specific: a home sale contingency, a rent-back agreement, or lead paint disclosure. That’s what an addendum does.

Addenda are added at the time of the original agreement or shortly after, before closing.

Common Addenda in Home Purchases

  • Financing addendum: Details about your loan type and terms
  • Inspection addendum: Specific inspection requirements or timelines
  • FHA/VA addendum: Required provisions for government-backed loans
  • Lead paint disclosure: Required for homes built before 1978
  • HOA addendum: Terms related to homeowner association requirements
  • Seller concessions addendum: Agreed closing cost credits

On a $350K home, you might have three to five addenda attached to your purchase agreement. Each one requires signatures from both parties.

Watch out for: Addenda that contradict the original purchase agreement. When there’s a conflict between the main contract and an addendum, the addendum usually takes precedence. This means a seller could slip in language that overrides protections you thought you had. Read every addendum carefully — don’t just sign where your agent points. Ask questions about anything you don’t understand.

Addendum vs. Amendment

An addendum adds new terms. An amendment changes existing terms. If your contract says closing is June 15 and you need to push it to June 30, that’s an amendment. If you’re adding a rent-back provision that didn’t exist in the original contract, that’s an addendum. Both require both parties to agree and sign.

Can the seller refuse to sign an addendum?

Absolutely. Addenda require mutual agreement. If you want to add an inspection contingency after the contract is signed, the seller can say no. That’s why it’s critical to include everything you need in the original offer. Your buyer’s agent should anticipate common addenda before you sign. Check our glossary and closing cost calculator for more details on contract terms.