Mutual agreement

Key Takeaways

• Mutual agreement is one of the essential elements of a valid contract, and it means every party has consented to the same terms and knows a deal has been made.
• Mutual agreement is built from an offer and an acceptance of that offer, which is why older textbooks call it a meeting of the minds.
• A response that changes any term of an offer is a counteroffer, so the parties have not yet agreed to the same document and there is no mutual agreement.
• In Washington the moment agreement is reached is called mutual acceptance, and RCW 64.06.020 hangs the seller disclosure deadline on that date.

What It Means

Mutual agreement is the point at which every party to a contract has consented to the same terms and each one understands that a deal has been struck. Older textbooks call it a meeting of the minds. Washington practice calls the moment it happens Mutual Acceptance, and it is one of the elements a contract needs before anyone can enforce it.

It is assembled from two moving parts. One party makes an offer. The other accepts that offer as written and communicates the acceptance back. Communication matters: a buyer who signs an offer, puts it in a drawer, and tells nobody has not created an agreement, because the seller has no way to know a deal exists. If the response changes anything, the price, the closing date, the appliances included, then the parties are not consenting to the same document. What came back is a Counteroffer, and the negotiation continues.

Mutual agreement is about consent, not about fairness. A seller who later decides the price was too low still agreed to that price. Regret is not a defect in agreement, and it is not a way out of a signed contract.

How It Works in Washington

In Washington, mutual agreement matters most for what it starts. Statutes use the term mutual acceptance and hang real deadlines on it. RCW 64.06.020 requires the seller of improved residential property to deliver the seller disclosure statement, the form brokers know as Form 17, not later than five business days after mutual acceptance of a written contract to purchase, unless the parties agree otherwise. RCW 64.06.030 then gives the buyer three business days from receipt to rescind. Those three days run from receipt, so a disclosure statement that is never delivered never starts the buyer's clock. That is why brokers pin down the mutual acceptance date in writing instead of leaving it to memory.

Washington also insists that real estate agreements be on paper. RCW 64.04.010 requires every conveyance of real estate, or any interest in it, to be by deed. RCW 19.36.010, the Statute Of Frauds section, separately makes a list of agreements void unless they are in writing and signed by the party to be charged, and that list includes an agreement employing a broker to sell or purchase real estate for a commission. Verbal agreement on price is a real meeting of the minds, but for a purchase it belongs on a signed Purchase And Sale Agreement.

Example

Elena lists her Olympia house at $549,000. On Tuesday, March 3, 2026, Tomas signs an offer at $535,000 with a closing date of April 17. Elena reads it, likes the price, and needs two extra weeks, so on March 4 she signs it back with the closing date changed to May 1. That is a counteroffer, not an acceptance, and there is still no contract.

Tomas thinks about it overnight. On Thursday, March 5 he signs Elena's counteroffer without changing a word, and his broker delivers the signed copy to Elena's broker that afternoon. Mutual acceptance is March 5. Both parties have now consented to the same document: $535,000, closing May 1.

The date does work. Counting five business days from Thursday, March 5, Elena must deliver the Form 17 by Thursday, March 12. She delivers it Tuesday, March 10, and Tomas has three business days from that receipt, through Friday, March 13, to rescind. Had Elena skipped it, Tomas's rescission window would still be open on closing day.

Common Mistakes and Exam Traps

• Mutual agreement is one element of a valid contract, not the whole test. Consideration, competent parties, and a lawful objective still have to be present.
• Signing is not the same as accepting. Acceptance has to be communicated back to the offeror before there is an agreement.
• Any change to an offer makes it a counteroffer. A distractor answer will describe a small change, such as moving the closing date by a week, and call it an acceptance.
• Mutual agreement forms the contract. It does not transfer title, which happens later when a deed is delivered and accepted.