Personal service — handing documents directly to the person being served — is always the gold standard in California. But what happens when someone is never home, dodging the process server, or simply impossible to catch in person?
That’s where substituted service comes in. Under California Code of Civil Procedure §415.20, if a process server makes reasonable attempts to serve someone personally and cannot do so, they may leave the documents with another competent person at the right location — and then mail a copy to the same address.
Done correctly, substituted service is just as legally valid as personal service. Done wrong, it can get your lawsuit dismissed before it even starts.
This guide explains exactly when substituted service is allowed, the precise steps required by California law, and the mistakes that can sink your case.
California Code of Civil Procedure §415.20 is the statute that governs substituted service. It covers two situations:
If the defendant is a business, corporation, or public entity and personal service cannot be made with reasonable diligence, you may leave a copy of the summons and complaint during normal business hours with the person apparently in charge of the office, and mail a copy to the defendant at the same address.
If the defendant is an individual, after exercising reasonable diligence, a process server may leave a copy of the documents at the person’s:
After leaving the documents, the process server must mail a copy to the defendant at the same address where the documents were left. Service is not complete until the mailing is done — and it is deemed complete 10 days after mailing.
This is the most litigated phrase in California process serving law. Courts don’t have a magic number of attempts, but California case law and the Judicial Council have provided significant guidance.
Generally, at least three attempts at different times of day and different days of the week is considered the baseline for “reasonable diligence.” Courts look for:
If you skip straight to substituted service after one attempt, a defense attorney will challenge the service in a motion to quash — and they’ll likely win. The court may find service invalid, requiring you to start over — and if the statute of limitations has run, your case could be gone for good.
Pro tip: A professional process server documents every attempt in detail. This documentation becomes part of the proof of service and protects you if service is ever challenged.
Not just anyone. California law requires the person accepting service to be:
A 15-year-old child, a visiting friend, or someone who doesn’t live there cannot legally accept substituted service on behalf of a resident.
Many self-represented litigants — and even some inexperienced process servers — forget that leaving the documents is only half of substituted service. The mailing is mandatory.
The requirements for the mailing:
Under CCP §415.20(b), service is not complete — and the defendant’s time to respond does not begin running — until 10 days after the mailing date.
This means if you leave documents on March 1 and mail them on March 2, service is complete on March 12. The defendant then typically has 30 days from that date to file a response to a complaint.
A proof of service for substituted service must document both the physical delivery and the mailing. A complete proof of service includes:
Missing any of these elements gives the defendant grounds to file a motion to quash service of process under CCP §418.10.
One or two attempts — especially if made at the same time of day — will not satisfy the “reasonable diligence” standard. Courts have quashed service where the process server made only two attempts before resorting to substituted service.
Leaving documents with someone under 18 at a residence, no matter how mature they seem, is legally invalid for substituted service purposes.
Service is legally incomplete without the follow-up mailing. No mailing = no valid service, full stop.
The mailing must go to the same address where you left the documents. Mailing to a different address — even if it’s the defendant’s correct address — does not satisfy the statute.
A commercial mail receiving agency (like a UPS Store mailbox) does not qualify as a “usual place of business” under CCP §415.20. Courts have consistently rejected this.
A proof of service that says only “left with John Doe, co-occupant” without describing the prior attempts, the person’s age, or the mailing will not hold up to scrutiny.
Because of the mandatory 10-day waiting period after mailing, substituted service adds at least 10 days to your service timeline compared to personal service. Plan accordingly when you’re working with filing deadlines or hearing dates.
Timeline example:
For certain types of cases and documents, substituted service is either not permitted or must be followed by additional steps:
When in doubt, consult the specific code sections governing your type of case, or hire a professional process server who knows the rules cold.
At Foxie Legal, we handle substituted service throughout Los Angeles County, Orange County, and San Diego County. Every attempt is documented with date, time, and detailed notes. Your proof of service will be court-ready and defensible if challenged.
Standard service is a flat $65 per address and includes up to four attempts at that address. When the completed method of service requires a follow-up mailing, that mailing is handled as part of the service process.
Place an order online → or call/text us at (949) 891-1639.
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