To change an existing California custody or visitation order, you file a Request for Order using Form FL-300 in the same family court that issued the current order. The form asks a judge to modify legal custody, physical custody, or the parenting schedule, and you must show the court that circumstances have changed meaningfully since the last order. Below is how to fill out and file a custody modification form (FL-300), what to attach, and what happens between filing and the judge’s ruling.
What You Have to Show the Judge
California applies the “changed circumstance rule” to modifications of final custody orders. You need to demonstrate that something significant has shifted since the order was signed and that a different arrangement would better serve the child’s health, safety, and welfare. Relocation, a change in the child’s school or medical needs, a parent’s substance abuse, or a shift in an older child’s preferences are typical examples.
The judge decides based on the child’s best interest. Family Code Section 3011 lists what that covers: the child’s health and safety, any history of abuse by a parent or someone seeking custody, the amount of contact each parent has with the child, and whether either parent habitually uses controlled substances or abuses alcohol.1California Legislative Information. California Family Code Section 3011 A parent with a domestic violence finding within the past five years faces a rebuttable presumption that giving them custody is detrimental to the child.2California Legislative Information. California Family Code Section 3044 Your declaration should speak directly to these factors.
Forms to Gather Before You Start
FL-300 is the main document, but a custody modification almost always involves attachments. The official FL-300-INFO instruction sheet identifies the forms you may need:3Judicial Council of California. Information Sheet for Request for Order (Family Law)
- FL-311, the Child Custody and Visitation Application Attachment, where you lay out the specific arrangement you want, including which parent has the child on which days.4California Courts. Child Custody and Visitation (Parenting Time) Application Attachment
- FL-341(C) for holiday, school break, and summer vacation schedules.
- FL-341(D) for physical custody specifics such as transportation, right of first refusal, and parent-to-parent communication.
- FL-341(E) for joint legal custody arrangements, including how parents handle disagreements about education, medical care, and extracurriculars.
- FL-105, the UCCJEA Declaration, if you have not already filed one or if the earlier version is out of date. It tells the court where the child has lived for the past five years and whether any other state has been involved.
- MC-031, the Attached Declaration, if the facts section on FL-300 runs out of room. Staple it to your FL-300.
If you cannot afford the filing fee, complete Form FW-001 at the same time. It asks for your income, monthly expenses, and whether you receive benefits like Medi-Cal, food stamps, or SSI.5California Courts. Request to Waive Court Fees Submit it with your FL-300 so the clerk processes both together.
Filling Out FL-300 Section by Section
The top caption takes your name, address, and phone number on the left and the court’s name and address below. Use the party labels exactly as they appear in the original petition (Petitioner, Respondent, Other Parent/Party), and write your case number in the box at the top right.3Judicial Council of California. Information Sheet for Request for Order (Family Law)
In the section asking what type of order you want, check “CHANGE” because you are modifying an existing order. Then check the boxes that apply: child custody, visitation (parenting time), or both. If you also want to change child support or other issues, check those too.
Item 9, “Facts in Support,” is the heart of the form. Reference the exact date and case number of the current custody order. Then explain what has changed since that order was signed and why your proposed arrangement is better for the child. Stick to concrete facts: a new school, a documented medical need, a parent’s move, a work schedule that makes the old exchange times impossible. Personal complaints about the other parent carry little weight unless they connect directly to the child’s safety or well-being. If you run out of room, continue on Form MC-031.
California Rules of Court, Rule 5.92 requires that FL-300 include enough facts to put the other parent on notice about what you are asking for and why.6Judicial Branch of California. California Rules of Court 2026 – Rule 5.92 “The current arrangement isn’t working” does not meet that standard. Be specific.
Filing and the Fee
Bring the original FL-300 with all attachments plus at least two copies to the clerk’s office at the courthouse where your case is assigned. The filing fee for a Request for Order is $60.7Judicial Branch of California. Statewide Civil Fee Schedule Effective January 1, 2026 If this is the first paper you have ever filed in a family law case and no case number exists yet, the fee jumps to $435 or more depending on the county.8California Courts. Ask the Court for an Order For most custody modifications, a case already exists, so the $60 fee applies.
The clerk stamps your documents “Filed,” assigns a hearing date and department number, and returns the copies. One stays with you; the other is for serving the other parent. Many counties also accept electronic filing through approved e-filing portals, so check your court’s website.
Some counties fill in Item 6 of FL-300 with the date and location of mandatory custody mediation at the counter. Others expect you to schedule mediation yourself and write in those details before you file. Ask your court’s Family Law Facilitator or Self-Help Center which procedure applies.3Judicial Council of California. Information Sheet for Request for Order (Family Law)
Serving the Other Parent
You cannot hand the papers to the other parent yourself. California law requires a neutral third party at least 18 years old who is not involved in the case to deliver the filed documents.9California Courts. Serving Court Papers The papers must reach the other parent at least 16 court days before the hearing. If the server mails the papers within California instead of handing them over in person, add five calendar days.10California Legislative Information. California Code of Civil Procedure – Motions and Orders
Two proof-of-service forms cover the usual methods. FL-330 is used when the server physically hands the papers to the other parent, which is the most reliable method. FL-335 is used for mail service, which is generally allowed for post-judgment motions when the other parent has already appeared in the case. The server fills in the date, time, and address of delivery or mailing and signs the form. File the completed proof of service with the clerk before the hearing date. Without it, the judge cannot make orders affecting the other parent, and a late or defective service usually means the hearing gets continued and the clock restarts.
Mandatory Custody Mediation
When custody or visitation is contested, Family Code Section 3170 requires both parents to attend mediation before a judge will hear the matter.11California Legislative Information. California Family Code Section 3170 A court-appointed mediator meets with both parents, usually at the courthouse or a family court services office, and tries to help them reach a parenting plan.
What happens if you cannot agree depends on your county. In a “recommending” county, the mediator writes a recommendation to the judge about the arrangement that would serve the child’s best interest. In a “non-recommending” county, the mediator only reports that no agreement was reached, and you argue the merits to the judge at the hearing.12Superior Court of California, County of Mono. Child Custody and Visitation Mediation In recommending counties the report carries significant weight, so come prepared with specific facts about the child’s needs. Each parent may bring a support person.
The Hearing and the Resulting Order
On your hearing date, check in with the bailiff or courtroom clerk. The judge reviews your filed documents, any mediator report, and the other parent’s Responsive Declaration (Form FL-320) if one was filed. Both sides get a brief opportunity to speak.
If the modification is granted, the court either issues a minute order summarizing the new arrangement on the spot or directs one of the parties to prepare a formal Findings and Order After Hearing (Form FL-340).13Judicial Branch of California. California Rules of Court 2026 – Rule 5.125 If you are asked to prepare FL-340, Rule 5.125 requires you to serve a proposed version on the other parent first. If the two sides disagree on wording, each submits a proposed order with a cover letter explaining the differences. Once the judge signs, the clerk files it and the new order replaces the previous arrangement.
If Your Child Is in Immediate Danger
The regular Request for Order process takes weeks. If your child faces immediate danger, you can ask for a temporary emergency (ex parte) order that takes effect before the regular hearing. Family Code Section 3064 limits these orders to two situations: immediate harm to the child, or an immediate risk the child will be removed from California.14California Legislative Information. California Family Code Section 3064 “Immediate harm” includes recent or ongoing domestic violence by a parent, sexual abuse of the child, and a parent’s illegal access to firearms. Vague concerns are not enough; describe specific incidents with dates and details.
To request emergency orders, check the “Temporary Emergency Orders” box on page 1 of FL-300 and the corresponding box in Item 2 on page 2. Along with FL-300, file:15California Courts. Ask for an Emergency (Ex Parte) Order
- FL-305, the Temporary Emergency Order, listing the specific orders you want.
- FL-303, the Declaration Regarding Notice and Service, showing you notified the other parent of the emergency request. In exceptional cases the judge may act without notice, but you still must serve the other side afterward.
- FL-105, the UCCJEA Declaration, if you have not filed one or if the earlier version is out of date.
Attach any supporting evidence such as police reports, medical records, or letters from counselors or teachers, and black out private information like Social Security numbers. The judge reviews the request the same day or the next business day. If granted, the temporary order lasts only until the full hearing date listed on your FL-300.
If a Parent Is on Active Military Duty
Federal law adds a layer of protection when either parent is an active-duty servicemember. Under 50 U.S.C. ยง 3938, no court may treat a servicemember’s absence due to deployment as the sole reason to permanently modify custody.16Office of the Law Revision Counsel. 50 USC 3938 – Child Custody Protection A temporary order issued solely because of deployment must expire no later than the end of the deployment period.
The Servicemembers Civil Relief Act separately lets a deployed parent request a stay of civil proceedings, including custody hearings. A parent who cannot attend should notify the court in writing and request a continuance. California courts must honor these federal protections regardless of what state law would otherwise allow.