California Conservatorship When Child Turns 18

What Changes at 18

On your child's 18th birthday, California law treats them as a fully autonomous adult. The parental authority you have held since birth over medical, educational, and financial decisions no longer follows automatically.

This is not a gradual handoff. It is a legal cliff. The school district transfers all special education rights to your child under Education Code Section 56041.5. Providers and banks generally need authorization from the adult — such as an Advance Health Care Directive, HIPAA release, or Durable Power of Attorney — to share information or allow someone else to act. These rules apply regardless of your child's disability diagnosis.

The question most parents ask at this point: do I need a conservatorship to keep helping my child?

For most families, the answer is no.

Why Conservatorship Is Not the Default

California enacted AB 1663 in January 2023, fundamentally changing how probate courts handle conservatorship petitions. Under Probate Code Section 1800.3, a judge now cannot grant a conservatorship unless they find it is the absolute least restrictive alternative — and the court must explicitly consider whether Supported Decision-Making Agreements, Powers of Attorney, and health care directives could serve instead.

This was not a subtle policy shift. The legislature declared that a disability diagnosis, by itself, does not justify a conservatorship. If your child can express preferences — even through augmentative communication, picture boards, or simple verbal cues — they may be able to execute private planning documents that give you the access and authority you need without court involvement.

What Works Instead

Four instruments cover the areas where parents lose authority at 18:

Advance Health Care Directive. Your child names you as their healthcare agent. You can consent to or refuse treatment when the directive's conditions are met and speak with providers; pair it with a HIPAA authorization if records access is needed. Signing requires a notary or two adult witnesses. Cost: about $15 for notarization.

Durable Power of Attorney for Finances. Your child appoints you to manage bank accounts, pay bills, and handle financial transactions. It can take effect immediately or spring into action upon documented incapacity.

Assignment of Educational Decision-Making Authority. Under Education Code Section 56041.5, your child can formally delegate IEP decision-making back to you. The school district must honor this document — no conservatorship required.

Supported Decision-Making Agreement. Under WIC Sections 21000–21008, your child chooses supporters to help them understand, make, and communicate their own decisions across multiple life domains. Unlike a conservator, supporters have no power to override your child — they help, not replace.

All four can be signed on your child's 18th birthday. None require court filings or attorney involvement, though an attorney review is wise for complex situations.

When a Conservatorship Is Genuinely Necessary

If your child cannot express preferences even with extensive support — they cannot indicate who they trust, cannot grasp the concept of choosing a helper — they likely lack the legal capacity to sign private planning documents. In that situation, a limited conservatorship may be the only viable path.

You can file the petition (Form GC-310) up to 60 days before your child's 18th birthday, though the court cannot issue an order until after they turn 18. This early filing gives the court investigator and, when applicable, the regional center time to complete their assessments, with the goal of a hearing shortly after the birthday.

Expect the process to take three to six months, with costs of $3,000 to $10,000 for attorney fees plus the $435 court filing fee and investigator charges. If your child receives SSI or Medi-Cal, you may qualify for a fee waiver using Form FW-001-GC — eligibility is based on the proposed conservatee's income, not yours.

The Eight-Month Planning Window

Start planning at least eight months before the birthday. Verify your child's regional center client status — establishing eligibility after 18 is significantly harder. Review the transition services section of their IEP. Draft all four private planning documents so they are ready to sign on the birthday.

If you determine a conservatorship is necessary, the two-month filing window (60 days before turning 18) gives you the best chance of having an order in place close to the birthday.

The California Adult Guardianship & Alternatives Guide provides the complete eight-month timeline, capability assessment worksheets, and step-by-step preparation checklists for every instrument — from SDM agreements through limited conservatorship petitions.

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