About Order Appointing Investigator and Notice of Investigation Costs
Appoints a court investigator to evaluate a proposed minor guardianship and notifies the petitioner of associated investigation costs.
When you'd use it: Filed when a petition for guardianship of a minor has been submitted and the court needs to appoint an investigator to assess whether the guardianship is in the minor's best interests.
Where to get the official form
The official version of Order Appointing Investigator and Notice of Investigation Costs is published as a PDF by the California courts. We checked this link and it resolved to a form on an official court or government website — always download the current version directly from the source rather than a third-party copy:
Download Order Appointing Investigator and Notice of Investigation Costs (PDF) →
Source: solano.courts.ca.gov
Link last checked: May 30, 2026
How to file Order Appointing Investigator and Notice of Investigation Costs in California
- Step 1 — Confirm you have the correct formUse Order Appointing Investigator and Notice of Investigation Costs (3510) when filed when a petition for guardianship of a minor has been submitted and the court needs to appoint an investigator to assess whether the guardianship is in the minor's best interests. Double-check it's the right form for your situation — California probate forms are revised periodically, so verify the name and number against your court's current form list before you start.
- Step 2 — Complete every required fieldFill out Order Appointing Investigator and Notice of Investigation Costs carefully and review it for errors before filing. Probate cases can already take months — a small mistake on the form can set your timeline back further.
- Step 3 — Get it notarized or witnessed if requiredSome probate forms must be signed in front of a notary or witnesses. Check the instructions on the form itself, and arrange notarization before you file if it's required.
- Step 4 — File it with the correct courtSubmit Order Appointing Investigator and Notice of Investigation Costs to the probate court or county clerk handling the estate — usually in the California county where the deceased lived. Ask the clerk how they prefer to receive filings (in person, by mail, or e-filing).