Frequently Asked Questions: Stepparent Adoption in Illinois (2026 Guide)

The short answer: stepparent adoption in Illinois is a well-worn court process, and Illinois law treats a stepchild as a "related child," which removes several steps other adoptions have to go through. You usually don't need the other parent's signature: in our experience, about 80% of the stepparent adoptions we've completed went forward without the other biological parent's consent. That's what courts see every day: the father never signs a consent, and the judge approves the adoption anyway. Below are the questions Illinois families ask us most, with answers checked against the Illinois Adoption Act (750 ILCS 50).

Why Illinois Stepparent Adoptions Are Simpler Than Most

The Illinois Adoption Act defines a "related child" to include a child whose adopting parent is the child's step-parent, by marriage or civil union (750 ILCS 50/1(B)). That label matters, because the Act relaxes several requirements for related-child adoptions:

Your spouse joins the petition with you, and their signature verifying the petition counts as their consent (750 ILCS 50/2(A)(a) and 50/8(b)(5)). After the adoption, your spouse keeps all of their parental rights (750 ILCS 50/17).

Can I Adopt My Stepchild in Illinois if the Other Parent Won't Consent?

Yes, and this is the most common situation we see. Illinois doesn't require the consent of a parent the court finds unfit by clear and convincing evidence (750 ILCS 50/8(a)(1)). That finding is made inside your adoption case, and the grounds most stepfamilies rely on are spelled out in the statute (750 ILCS 50/1(D)):

• Intent to give up parental rights, shown by failing for 12 months to visit the child, to communicate with the child, or to keep in contact or plan for the child's future, although able to do so (1(D)(n)).
• Failure to maintain a reasonable degree of interest, concern, or responsibility for the child's welfare (1(D)(b)).
• Desertion of the child for more than 3 months before the adoption was filed (1(D)(c)).
• Abandonment of the child (1(D)(a)).

There's one more route families often miss. If the father was never married to the mother and never legally established paternity, Illinois may not require his consent at all: the statute lists the situations in which a father's consent is needed (750 ILCS 50/8(b)(1)(B)). He may still be entitled to notice of the case (750 ILCS 50/7(C)), which is a routine step.

What if I Don't Know Where the Other Parent Is?

You can still adopt. Illinois has a standard process for a parent who can't be found:

1. You make a diligent search (last known addresses, relatives, social media, public records) and keep notes.
2. You file an affidavit with the circuit clerk saying the parent can't be found on due inquiry.
3. The clerk publishes an adoption notice in a newspaper published in your county, and mails a copy within 10 days to any address you listed (750 ILCS 50/7(A)).

Under Illinois's general publication rule, the notice runs once a week for 3 successive weeks, and no default can be taken until at least 30 days after the first publication (735 ILCS 5/2-207). If the parent doesn't respond, the case moves forward. Courts handle these cases routinely.

Does My Stepchild Have to Consent?

If your stepchild will be 14 or older on the date the judgment is entered, the adoption can't be granted without the child's written, acknowledged consent (750 ILCS 50/12). The court can waive this for a child who is in need of mental treatment or has an intellectual disability. In our experience, teenagers who've grown up with a stepparent are usually glad to sign.

Can an Unmarried Couple Adopt in Illinois?

Illinois law lets "a reputable person of legal age" petition to adopt, and it requires a spouse or civil union partner to join the petition when the petitioner is married or in a civil union (750 ILCS 50/2(A)(a)). Two points matter for couples:

• Civil union partners are treated like spouses under the Act, including for the step-parent definition of a related child (750 ILCS 50/1(B)).
• A parent who is also a petitioner keeps all parental rights after the adoption (750 ILCS 50/17).

If you're unmarried and not in a civil union, you aren't a step-parent under the Act, so the requirements for non-related adoptions, such as six months of Illinois residence and a court-ordered investigation with a fingerprint background check, would generally apply (750 ILCS 50/2(A) and 50/6(A)). Because these cases have more moving parts, check the Illinois state guide and consider a short consultation with an Illinois attorney.

How Much Does a Stepparent Adoption Cost in Illinois?

Illinois caps what the circuit clerk can charge. Adoption filings fall under the statute's Schedule 3, which can't exceed $94 outside Cook County or $270 in Cook County, and the clerk can't charge any other fee in connection with an adoption proceeding (705 ILCS 105/27.1b). In practice, Cook County and McHenry County both list an $89 adoption filing fee on their posted schedules. Newspaper publication, if needed, is a separate cost set by the paper.

See our Illinois stepparent adoption cost guide for the full breakdown.

What Documents Do I Need?

The exact package depends on your county and your family's situation, but an Illinois stepparent adoption commonly includes:

Illinois lets you file in any county in the state (750 ILCS 50/4), though most families file where they live.

How Long Does It Take?

Many uncontested adoptions finish within a few months; the county court calendar and any publication period set the pace. Illinois law also gives adoption cases priority over other civil cases in being set for hearing (750 ILCS 50/20). Because your stepchild is a related child, the six-month waiting period after an interim order that applies to other adoptions doesn't apply to you (750 ILCS 50/14(e)).

Will My Stepchild Get a New Birth Certificate?

Yes. After the judgment, the circuit clerk sends a certificate of adoption to the State Registrar of Vital Records (410 ILCS 535/16), and for a child born in Illinois the Registrar establishes a new birth certificate unless the court, the adoptive parents or the adopted person asks it not to (410 ILCS 535/17). If your child was born in another state, the record is forwarded to that state's vital records office. McHenry County's posted schedule lists a $15 Illinois Department of Public Health fee for completing the new birth record, including one certified copy; ask your clerk what applies in your county.

Once the judgment is entered, the other parent's rights and responsibilities end, including the duty to pay child support going forward (750 ILCS 50/17). Whether any back support already owed can still be collected depends on Illinois law and the facts of your case.

Frequently Asked Questions

Can I adopt my stepchild in Illinois without the other parent's consent?

Yes. Illinois doesn't require the consent of a parent the court finds unfit, for example a parent who failed for 12 months to visit or communicate with the child although able to (750 ILCS 50/1(D)(n) and 50/8(a)(1)). In our experience, about 80% of completed stepparent adoptions go forward without the other parent's consent: the father never signs, and the judge approves the adoption anyway.

What if the other parent has disappeared?

After a diligent search, you file an affidavit and the circuit clerk publishes a notice in a county newspaper, once a week for 3 weeks. If the parent doesn't respond, the case moves forward. It's a routine part of Illinois adoptions.

Does my stepchild have to agree to the adoption in Illinois?

Yes, if the child is 14 or older on the date of the judgment. The consent must be in writing and acknowledged (750 ILCS 50/12).

Do I need a home study for a stepparent adoption in Illinois?

Not usually. Illinois law says the investigation isn't made in a related-child adoption, which includes a stepchild, unless the judge orders one (750 ILCS 50/6(D)).

How much does it cost to file a stepparent adoption in Illinois?

The clerk's adoption filing fee is capped by statute at $94 outside Cook County and $270 in Cook County; Cook and McHenry counties both post an $89 fee. Our document package is $349, and publication, if needed, is paid to the newspaper.

Can my civil union partner adopt my child in Illinois?

Yes. Illinois treats a civil union partner like a spouse under the Adoption Act, so your partner adopts as a step-parent and you keep all of your parental rights (750 ILCS 50/1(B), 50/2(A)(a) and 50/17).

About the Author

Doug Brown, Founder. Doug Brown has helped families prepare stepparent and adult adoption paperwork since 2001: more than 34,000 families in all 50 states. StepParent Adoption 360 is a document-preparation service, not a law firm, and doesn't give legal advice.

Sources: Illinois Adoption Act, 750 ILCS 50/1, 2, 4, 5, 6, 7, 8, 12, 13, 14, 17 and 20 (ilga.gov); 735 ILCS 5/2-207 (publication period); 705 ILCS 105/27.1b (circuit clerk adoption fees); 410 ILCS 535/16 and 17 (Vital Records Act); Clerk of the Circuit Court of Cook County, County Division Fee Schedule; McHenry County Circuit Clerk, Fee Schedule (effective January 1, 2023). Fees change; confirm with your clerk. Company figures (34,000+ families since 2001; about 80% of completed stepparent adoptions without the other parent's consent) are from our own records.