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FL Modify 603Mandatory

Motion for Adequate Cause Decision (to change a parenting/custody order)

Washington · Washington State Courts · Effective January 1, 2022

This form is used to ask the court to decide if there are enough valid reasons (adequate cause) to change an existing parenting or custody order. It allows a party to either ask the court to move forward with a change or ask the court to dismiss a request for change.

Open the official PDFfrom Washington State Courts

Where this fits in a case

Motions

Stage: Motions

This form is used when a parenting or custody order needs to be changed, and a party needs to formally ask the judge to decide if there are enough valid reasons to make that change.

Either party may file.

Common questions

Who fills out this form?
The person making the motion or their lawyer fills out the form. It is used by either party involved in the case.
What must I do if I file this motion?
The person filing must schedule a hearing for this motion. They must also file their original documents with the Superior Court Clerk and serve copies on all other parties.
What if I disagree with the request?
If you receive this motion and do not agree with the requests, you can file a statement explaining why the court should not approve the requests.

Revision history

No changes recorded since we started tracking this form on October 9, 2026. The current version took effect January 1, 2022.

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