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Rule 3.544.Add-on cases

Division 4. Parties and Actions · Chapter 7. Coordination of Complex Actions · Article 4. Pretrial and Trial Rules for Complex Coordinated Actions · Last amended 2016 · Last verified July 29, 2026

In one sentenceRule 3.544 lets a party ask the coordination trial judge to add a new case onto an existing coordination proceeding, sets the deadlines for opposing that request, allows a hearing on the disputed issues, and lets the judge grant or deny the request without a hearing if no one opposes it.

Full Text of Rule 3.544

Text sizeJump to: (a) (b) (c) (d)

(a) Request to coordinate add-on case A request to coordinate an add-on case must comply with the requirements of rules 3.520 through 3.523, except that the request must be submitted to the coordination trial judge under Code of Civil Procedure section 404.4, with proof of service of one copy on the Chair of the Judicial Council and proof of service as required by rule 3.510. (Subd (a) amended effective January 1, 2016; previously amended effective January 1, 2005, and January 1, 2007.)
(b) Opposition to request to coordinate an add-on case Within 10 days after the service of a request, any party may serve and submit a notice of opposition to the request. Thereafter, within 15 days after submitting a notice of opposition, the party must serve and submit a memorandum and declarations in opposition to the request. Failure to serve and submit a memorandum and declarations in opposition may be a ground for granting the request to coordinate an add-on case. (Subd (b) amended and lettered effective January 1, 2005; adopted as part of subd (a).)
(c) Hearing on request to coordinate an add-on case The coordination trial judge may order a hearing on a request to coordinate an add-on case under rules 3.527 and 3.528 and may allow the parties to serve and submit additional written materials in support of or opposition to the request. In deciding the request to coordinate, the court must consider the relative development of the actions and the work product of counsel, in addition to any other relevant matter. An application for an order staying the add-on case must be made to the coordination trial judge under rule 3.515. (Subd (c) amended effective January 1, 2007; adopted as subd (b); previously amended and relettered effective January 1, 2005.)
(d) Order on request to coordinate an add-on case If no party has filed a notice of opposition within the time required under (b), the coordination trial judge may enter an order granting or denying the request without a hearing. An order granting or denying a request to coordinate an add-on case must be prepared and served under rule 3.529, and an order granting such request automatically stays all further proceedings in the add-on case under rule 3.529. (Subd (d) amended effective January 1, 2007; adopted as subd (c); previously amended and relettered effective January 1, 2005.)

Plain-English Summary

Coordination proceedings tend to grow. Rule 3.544 governs how a case gets pulled into one that already exists. A request to coordinate a new case as an add-on largely follows the same requirements as an original petition for coordination, but it goes straight to the coordination trial judge already presiding over the proceeding, under Code of Civil Procedure section 404.4, with proof that a copy reached the Chair of the Judicial Council and the service an original coordination request requires.

Anyone who objects has two windows to act in. Within 10 days after the request is served, an opposing party files a notice of opposition; within 15 days after that, the party has to back it up with a memorandum and supporting declarations. Skipping that second step can itself be a reason for the judge to grant the request — silence after an initial objection does not preserve it.

What happens next depends on whether anyone opposed. If no notice of opposition arrives in time, the trial judge can grant or deny the add-on request without a hearing at all. If someone did object, the judge may order a hearing under the same rules that govern hearings on an original petition, let the parties file more written material, and weigh how far the case has developed and the work counsel has already done, along with anything else relevant. Whichever way the request comes out, the order granting or denying it follows the same filing and service rule as any coordination order, and a grant automatically stays the case just as an original coordination order would.

Frequently Asked Questions

How does a party ask to add a new case onto an existing coordination proceeding?

By submitting a request that meets the requirements of Rules 3.520 through 3.523 to the coordination trial judge, under Code of Civil Procedure section 404.4.

How much time does a party have to oppose an add-on request?

10 days to serve and submit a notice of opposition, then 15 more days after that to serve and submit a supporting memorandum and declarations.

What happens if no one opposes the add-on request?

The coordination trial judge may enter an order granting or denying the request without a hearing.

Does an add-on case get automatically stayed once it is added?

Yes. An order granting a request to coordinate an add-on case automatically stays all further proceedings in that case under Rule 3.529.

Can a party ask to stay the add-on case while the request is pending?

Yes. An application for a stay order is made to the coordination trial judge under Rule 3.515.

Amendment History

Rule 3.544 amended effective January 1, 2016; adopted as rule 1544 effective January 1, 1974; previously amended effective January 1, 2005; previously amended and renumbered as rule 3.544 effective January 1, 2007.

Source & verification. Rule text is reproduced verbatim from the Judicial Council of California. Adopted by the Judicial Council of California. Last verified July 29, 2026. · Official source
Also known as: add-on case request california coordinationcrc 3.544 opposing add-on caseccp 404.4 add-on coordinationadding a new case to existing coordination proceeding