How to Enforce a Mediation Settlement Agreement in California After the Other Party Refuses to Sign
In California, you can often enforce a mediated settlement even if the other party refuses to sign—most commonly through a motion under Code of Civil Procedure § 664.6 when the agreement is properly memorialized. Disputes usually turn on whether the settlement was “in writing” and “signed” (or otherwise satisfies statutory requirements) and whether the court retained jurisdiction. This article explains the fastest enforcement paths, common drafting traps, and what to do when you only have emails, a term sheet, or a mediator’s note.
Parties often leave mediation believing the case is “done,” only to learn days later that the other side will not sign the long-form agreement—or claims there was never a final deal. In California, enforcing a mediation settlement agreement after a refusal to sign is possible, but the outcome depends on how the settlement was documented and whether the statutory enforcement tools apply.
1) Start with the key question: do you have an enforceable settlement?
California treats most settlements as contracts. That means you typically need (1) mutual assent (offer/acceptance), (2) definite material terms, and (3) consideration. In mediation, the practical fight is rarely “consideration”; it’s whether there was a final meeting of the minds and whether the proof is admissible and sufficiently formal to support expedited enforcement.
Why “they agreed in the room” is not always enough
Mediation communications are strongly protected by confidentiality rules. Even if everyone remembers that the parties shook hands and “agreed,” you may be barred from proving it unless the settlement was captured in a manner that fits within an exception to confidentiality and meets the requirements of an enforcement statute.
2) The fastest enforcement tool: Code of Civil Procedure § 664.6
When available, a motion under Code of Civil Procedure (CCP) § 664.6 is often the most efficient way to enforce a settlement in an existing case. It allows the court to enter judgment pursuant to the settlement—without requiring a separate lawsuit for breach of contract—if statutory conditions are met.
What § 664.6 generally requires
For many civil cases, the settlement must be either:
- In a writing signed by the parties, or
- Orally stipulated before the court (e.g., on the record).
Courts treat these requirements as more than technicalities: they are meant to prevent later disputes about whether a settlement was authorized and final.
“Refuses to sign” vs. “already signed something”
The title problem—refusal to sign—splits into two common scenarios:
- You have a signed mediation term sheet (or MOU), but the other side refuses to sign the later long-form agreement. In many cases, the signed term sheet is enough to enforce under § 664.6 if it contains the material terms and shows intent to be bound.
- You only have an unsigned draft, emails, or the mediator’s recollection. Enforcement becomes harder; § 664.6 may be unavailable, and confidentiality may block key evidence.
Practical example: enforceable term sheet
In a business dispute, the parties sign a one-page “Mediation Settlement Agreement” at the session: payment amount, timing, mutual releases, dismissal with prejudice, and a clause stating the document is intended to be binding and enforceable under CCP § 664.6. Days later, the defendant refuses to sign the “formal” settlement agreement because it includes routine provisions (non-disparagement, confidentiality, tax language). If those provisions were not conditions of the deal, the plaintiff can often move to enforce the signed term sheet and obtain judgment.
Practical example: risky documentation
In an employment case, counsel emails “We have a deal at $150k, standard terms to follow,” but the client never signs anything at mediation. The employer later disputes non-monetary terms (reference language, non-rehire) and refuses to execute. A § 664.6 motion may fail because the agreement was not signed by the parties and the court may not be able to consider mediation communications to establish the missing terms.
3) The mediation confidentiality trap (Evidence Code § 1119)
California’s mediation confidentiality statutes are among the strictest in the country. Evidence Code § 1119 generally makes mediation communications inadmissible and not subject to discovery. This matters because the evidence you might instinctively use to prove the deal—mediator emails, caucus notes, “what was said,” draft language exchanged during mediation—may be excluded.
The key exception: a written, signed settlement (Evidence Code § 1123)
Settlement agreements reached through mediation can be admissible if they satisfy Evidence Code § 1123—typically by being written and signed, and by including language (or clear circumstances) showing the parties intended the agreement to be enforceable or admissible.
Practice pointer: If you anticipate possible buyer’s remorse, ensure the mediation settlement document includes an enforceability/admissibility statement and identifies that it is binding and enforceable under CCP § 664.6 (when applicable).
4) When § 664.6 is not available: alternative enforcement paths
If you cannot use § 664.6—because the agreement is not properly signed, the case was already dismissed without retained jurisdiction, or you’re in a posture where § 664.6 is otherwise unavailable—you may still have options.
A) File (or amend) a breach of contract claim
You can sue for breach of the settlement agreement like any other contract—seeking damages and/or specific performance. This is slower than § 664.6, and you still must overcome confidentiality and admissibility issues. But when you have an enforceable written contract outside the confidentiality barrier (or within an exception), contract litigation can be viable.
B) Seek equitable remedies (specific performance / declaratory relief)
If money damages are inadequate, a party may seek specific performance (for example, compelling execution of releases or transfer of property). Declaratory relief may be used to obtain a court ruling that a settlement exists and what it means—again, subject to evidentiary limits.
C) If the case was dismissed: retained jurisdiction is critical
If the underlying case has been dismissed, the court may lack power to enforce the settlement unless it retained jurisdiction to do so. California practitioners often use a request that the court retain jurisdiction (commonly associated with CCP § 664.6 procedures). If you dismissed the case without retained jurisdiction, you may be forced into a new action to enforce the agreement.
5) Step-by-step: how attorneys typically enforce a mediated settlement when the other side won’t sign
Step 1: Identify what document is enforceable
Gather the signed mediation settlement agreement, MOU, or term sheet. Confirm:
- It is written and signed by the parties (not just counsel, unless the party signatures are not required for your specific posture).
- It states (or clearly shows) it is binding and intended to be enforceable.
- It includes material terms: payment, timing, releases, dismissal, allocation, and any non-monetary obligations.
- It addresses attorney’s fees for enforcement (a powerful lever).
Step 2: Send a targeted meet-and-confer / demand to perform
Before filing a motion, send a letter demanding performance by a date certain and attaching execution-ready documents consistent with the signed terms. This can (1) create a clean record of refusal, (2) narrow claimed disputes, and (3) support a later request for fees or sanctions where available.
Step 3: File a motion to enforce under CCP § 664.6 (when you can)
A typical § 664.6 motion requests that the court:
- Find the parties entered into the attached settlement agreement;
- Order performance of its terms; and/or
- Enter judgment pursuant to the settlement.
Attach the signed agreement and any admissible declarations needed to explain the procedural posture (e.g., that jurisdiction exists and the agreement is the one reached at mediation). If the other side claims ambiguity, courts may hold a limited evidentiary hearing to resolve factual disputes about formation and meaning—still generally constrained by mediation confidentiality.
Step 4: Ask for interest, fees, and a clear judgment form
If your agreement provides for attorney’s fees and costs to enforce, request them. Ensure the proposed judgment:
- States the payment obligations and due dates (or incorporates the settlement precisely);
- Includes releases/dismissal mechanics;
- Addresses confidentiality/non-disparagement enforcement if included; and
- Specifies post-judgment interest where applicable.
Step 5: Enforce the judgment if nonpayment continues
Once judgment is entered, you can use judgment enforcement tools (liens, levies, judgment debtor examinations) rather than continuing to argue about contract performance.
6) Common defenses—and how to counter them
Defense: “We never agreed to that term”
Counter: Point the court to the signed writing and show the term is either (1) included, (2) reasonably implied by the agreement’s mechanics, or (3) not a material term. Many post-mediation “disputes” are attempts to renegotiate, not genuine formation issues.
Defense: “It was just an agreement to agree”
Counter: A short-form settlement can still be final if it includes essential terms and shows intent to be bound immediately, with later paperwork treated as ministerial. Use explicit language in the term sheet: “This agreement is intended to be
