Can a stepparent adopt a child born out of wedlock in Washington?

Yes. In Washington, a stepparent can petition the Superior Court in their county to adopt a stepchild, including a child born out of wedlock, under Revised Code of Washington Chapter 26.33. The statutes we work from are written around the family's current situation and the rights of the child's other parent, so the key question is how that parent's rights are addressed, not whether the birth happened inside a marriage.

What stays the same:

• Court: Your petition is filed in the Superior Court in your county.
• Residency: Washington has no minimum residency period for this process (RCW 26.33.030).
• Length of marriage: Washington does not specify a minimum marriage duration.
• Background checks: Washington requires criminal background checks for adoptive parents.
• Timeline: Stepparent adoptions typically take 3-6 months.

The other parent's rights: This is where an out-of-wedlock birth can matter. Whether the other parent is named on the birth certificate, never established paternity, or is unknown can change what notice or consent the court needs. Washington law on those specific points should be confirmed with the Superior Court clerk in your county or an attorney, because the answer depends on your facts.

Abandonment: If the other parent has not been involved, RCW § 26.33.120 is the citation to know. Washington sets no fixed number of months for abandonment. It depends on the parent's overall conduct. Courts look at the whole relationship, not just money, so sporadic child support does not by itself prevent an abandonment finding when there has been no meaningful contact with the child. Whether abandonment applies in your situation is a question for the court.

Your child's consent: A child who is 14 or older has a consent role under RCW § 26.33.160. If your stepchild is younger than that, the clerk can confirm how the court handles it.

Home study: Home study rules appear in RCW 26.33.220. Ask the Superior Court clerk whether a home study will be needed for your family.

Birth certificate: Certified records come from the Washington State Department of Health Center for Health Statistics. Having the child's birth certificate in hand helps you describe the other parent's status accurately.

Costs: Court filing fees typically run $200-$500, and the total typically comes to under $1,000. Hiring an attorney for the same adoption often costs $3,000-$5,000+.

How we help: StepParent Adoption 360 is a document preparation service, not a law firm. You answer questions online, and we prepare the complete court document package for your county. You then file it yourself without an attorney. The price is $349 for the first child and $99 for each additional child, and court-ready documents arrive within 24-48 hours after you finish the questions. We include a 100% court acceptance guarantee, and we have helped 1104 Washington families, and more than 34,000 families nationally since 2001.