To file for full custody in Washington, you file a Petition for a Parenting Plan in the Superior Court of the county where your child lives, asking the court to give you primary residential placement and sole decision-making authority. Washington does not use the phrase “full custody” in its statutes, but that combination — the child living with you the majority of the time and you making the major decisions alone — is what most parents mean by it. The court will grant it only if the evidence supports it under the child’s best interests and, in the strongest cases, under the statute’s limiting factors.
What “Full Custody” Actually Means in Washington
Every case involving children ends in a parenting plan. The plan covers three things: the residential schedule (which days and overnights each parent has), decision-making authority over education, healthcare, and religious upbringing, and a process for resolving future disputes.
Washington law starts from a rebuttable presumption that equal residential time serves the child’s best interest. That presumption gives way when the statute’s limiting factors apply or when the parents agree otherwise.1Washington State Legislature. Washington Code RCW 26.09.187 – Parenting Plan So a parent asking for sole residential placement is not simply asking for a schedule; they are asking the court to override that presumption. That framing shapes everything about how you file.
What You Have to Show the Court
When parents cannot agree, the court weighs several factors and gives the greatest weight to the strength, nature, and stability of the child’s relationship with each parent. Other factors include each parent’s history of day-to-day caregiving, the child’s emotional needs and developmental stage, the child’s ties to siblings and school, each parent’s willingness to support the child’s relationship with the other parent, the wishes of a child mature enough to express a reasoned preference, and each parent’s work schedule.1Washington State Legislature. Washington Code RCW 26.09.187 – Parenting Plan
Mandatory Limiting Factors
Certain conduct by a parent forces the court to restrict that parent’s residential time. If the court finds any of the following, the other parent’s time must be limited:
- Willful abandonment that continued for an extended period
- Physical abuse or a pattern of emotional abuse of the child
- A history of domestic violence, an assault causing grievous bodily harm or fear of it, or any sexual assault
- Sexual abuse of a child
The same restrictions apply when a parent knowingly lives with someone who has engaged in that conduct.2Washington State Legislature. Washington Code RCW 26.09.191 – Mandatory and Discretionary Limitations on Parenting When any of these apply, the court is required to award sole decision-making authority to the other parent and eliminate shared dispute resolution. This is the clearest path to what most people mean by full custody.
Discretionary Limiting Factors
Courts can also limit a parent’s time or decision-making for behavior that falls short of the mandatory triggers: neglect or substantial failure to perform parenting duties, long-term physical or emotional impairment that interferes with parenting, substance abuse that impairs parenting ability, weak emotional ties between the parent and child, abusive use of conflict that risks serious psychological damage to the child, and withholding the child from the other parent for a prolonged period without good cause.2Washington State Legislature. Washington Code RCW 26.09.191 – Mandatory and Discretionary Limitations on Parenting
The practical takeaway: before filing, know which factors you are relying on and what evidence backs each one. Vague concerns about the other parent’s household will not overcome the equal-time presumption. Documented conduct will.
Documents and Forms to Prepare
Pull your information together before you touch the forms. You will need full names, dates of birth, and current addresses for both parents and all children; income and expense records for both parents (the child support worksheets require them); and any evidence supporting a request for sole residential placement or sole decision-making — police reports, protective order records, medical records, school records, saved communications, or declarations from people with firsthand knowledge.
Washington’s standardized forms are on the Washington Courts website.3Washington State Courts. Court Forms The core set:
- Petition for a Parenting Plan, which starts your case and lays out the residential schedule and decision-making arrangement you are asking for.
- Summons, the formal notice to the other parent that they must respond.
- Confidential Information Form, which contains sensitive identifiers like Social Security and account numbers under seal.
- Child Support Worksheets, which calculate each parent’s obligation from actual income figures.
The petition matters most because it frames what you are asking the court to do. Name the specific days and overnights you want for each parent. If you want sole decision-making over education, healthcare, or religion, say so and say why. Use exact income figures in the worksheets; estimates invite challenges.
Filing and Fees
File the completed forms with the Superior Court Clerk in the county where the child lives. Submit the originals and keep copies for your own records and for service. Some counties accept electronic filing.
The base filing fee for a civil action is $200, and mandatory surcharges bring the total to roughly $290, though local surcharges push some counties to $310 or higher.4Washington State Legislature. Washington Code RCW 36.18.020 – Clerk’s Fees, Surcharges Modifying an existing in-county parenting plan costs much less, often around $56 plus surcharges. If the fee is out of reach, ask the court to waive it by filing a fee waiver motion and financial statement under General Rule 34.5Washington State Courts. GR 34 Request for Waiver of Civil Filing Fees and Surcharges
Serving the Other Parent
Filing does not give the other parent legal notice. You have to serve them. Someone at least 18 years old who is not a party to the case has to deliver the papers — a professional process server, a sheriff’s deputy, or a willing adult who is not you.6Washington State Courts. Washington Code CR 4 – Process
Personal service — hand-delivering the documents to the other parent — is the preferred method. When personal service is not possible, the court can authorize alternatives. Service by mail to the last known address may be allowed if the serving party files an affidavit showing mail is as likely to give actual notice as publication would. Service by publication is a last resort when the other parent cannot be located, and it generally requires a court order.6Washington State Courts. Washington Code CR 4 – Process
Once service is done, the person who served the papers signs a proof of service describing when, where, and how service happened, and that document gets filed with the court. The case cannot move forward without it.7Washington State Courts. Washington Code CR 55 – Default
After Service: Response, Default, and Temporary Orders
The other parent has 20 calendar days to respond after being served in Washington, or 60 days if served outside the state. If they do not respond, you can move for default under Civil Rule 55. Default lets the court enter the parenting plan you proposed without their input, though the judge still checks that it serves the child’s best interests.7Washington State Courts. Washington Code CR 55 – Default
If the other parent files a response, the case is contested. You can ask for temporary orders early on to lock in an interim residential schedule, temporary child support, and any restraining provisions while the case is pending. In emergencies involving immediate danger to a child, a parent can seek ex parte temporary orders that the court may grant before the other parent has a chance to respond, with a hearing set within about 14 days.
What the Contested Track Looks Like
Most Washington counties require both parents to attend a parenting seminar during the case. Parents attend separate sessions. Courts can waive the requirement in domestic violence situations or for other good cause.8Washington State Legislature. Washington Code RCW 26.12.172 – Parenting Seminars, Rules
In contested cases the court may appoint a Guardian ad Litem, an independent investigator who evaluates both households and recommends a parenting plan. The GAL can interview parents, children, teachers, and counselors, observe parent-child interactions, and review criminal and court records, then submit a written report to the judge. Even when parents settle, the GAL still approves any agreed orders affecting the children. GAL costs are split between the parents based on ability to pay, and the county covers the cost if both parents are indigent.9Washington State Legislature. Washington Code RCW 26.12.175 – Appointment of Guardian Ad Litem Straightforward cases can run a few thousand dollars; heavily contested ones cost substantially more.
Courts often refer contested issues to mediation before a hearing, giving parents a chance to negotiate a plan with a neutral rather than leaving it to a judge.10Washington State Legislature. Washington Code RCW 26.09.015 – Mediation Proceedings Mediation is waived where domestic violence is present.
If the case stays contested, both sides can use discovery: written questions the other parent answers under oath, requests for documents like financial records and text messages, depositions, and requests for admissions.11Washington State Courts. Washington Code CR 26 – General Provisions Governing Discovery Discovery is how cases involving hidden income, undisclosed substance abuse, or other concealed problems tend to open up. If you believe the other parent is hiding something material to custody, this is the mechanism.
Unresolved cases go to a settlement conference, and if that fails, to trial. At trial each parent presents testimony, witnesses, and documentary evidence, and the judge issues a final parenting plan applying the statutory best-interest factors.
The Final Parenting Plan
The case ends in a final parenting plan — either a stipulated order the parents agreed on or one the judge imposed. The plan spells out the residential schedule for regular weeks, holidays, school breaks, and special occasions; assigns decision-making authority for education, healthcare, and religion; and sets a dispute resolution process. Once a judicial officer signs it, the plan is a court order. Violating it can lead to contempt. It stays in effect until the child turns 18 or the court modifies it.
Modifying or Moving Later
A final plan is not permanent, but changing it takes more than second thoughts. To modify a parenting plan, the parent asking for the change has to show a substantial change in circumstances since the original order, based on facts the court did not know or that arose later, and the change has to be in the child’s best interest.12Justia. Washington Code RCW 26.09.260 – Modification of Custody Decree or Parenting Plan Minor schedule tweaks that do not shift the majority of residential time face a lower threshold, but still require changed circumstances.
If you receive primary residential placement and later want to move, Washington requires at least 60 days’ written notice before relocating the child, delivered by personal service or by mail with a return receipt.13Washington State Legislature. Washington Code RCW 26.09.430 – Notice Requirement The notice must include the new address (or at least the new city and state), the intended move date, the children’s names and ages, a brief explanation of the reasons for the move, and a proposed revised residential schedule. It also has to warn the other parent that they have 30 days after receiving it to object, or the relocation is allowed. Moving closer to the other parent does not trigger the notice requirement. Failing to give proper notice will not automatically block a relocation, but it damages credibility and can lead to sanctions.