Addendum

A separate document added to a contract that adds or changes terms. Both sides sign it. Common addenda cover inspections, financing, and lead-based paint.

Offers & contracts · Updated September 2026

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Part 1 of 4

Why a seller cares

Almost every contract is changed at least once after signing, and an addendum is how. If it is not written and signed by both sides, it did not happen, however clearly it was agreed by text.

Part 2 of 4

A simple example

After the inspection you agree to a $2,000 credit instead of repairs. A one-page addendum says so, both sides sign it, and the title company reads it at closing.

Addendum: a simple example
What was agreedHow it is made real
A $2,000 credit instead of repairsA repair addendum, signed by both sides, sent to the title company
Closing moves from the 14th to the 21stA closing date addendum; every deadline tied to closing moves with it
Agreed by text, never written upNothing changes; the original contract still controls at closing

The contract at closing is the original plus every signed addendum, and nothing else.

Part 3 of 4

What people get wrong

That a text or an email saying "fine, $2,000 it is" changes the contract. Until the addendum is signed by both sides, the original terms still stand.

Part 4 of 4 · where to read next

Where it appears in the sale

What a definition is, and what it isn't

Keighbor is a software company, not a law firm, brokerage, or tax adviser. This is general information, not legal, tax, financial, or real estate advice about your sale. Your situation may differ. Before acting on a contract, disclosure, title, tax, or pricing question, ask an appropriately licensed professional in your state.

Written and researched by Keighbor Research · drawn from the reference glossary · how we research and check what we publish

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