How to serve a preliminary notice in California

Serving the notice correctly matters as much as sending it on time. Get the method wrong and the notice may not count — which can cost you your mechanics lien rights. Here’s how California law (Cal. Civ. Code §§ 8100–8118) says to do it.

Step 1: Identify everyone you have to serve

Serve the owner or reputed owner, the direct (general) contractor, and the construction lender if there is one (Cal. Civ. Code § 8200). Pull the names from the building permit, the recorded construction deed of trust, and the county assessor. Missing a required recipient can defeat the notice.

Step 2: Find the correct service address

Use the address on the building permit or construction loan, the owner’s address on the latest tax assessment roll, or the address in the contractor’s or lender’s own records (Cal. Civ. Code § 8108). When no business address is available, the recipient’s residence works.

Step 3: Use an approved delivery method

• First-class certified or registered mail with return receipt
• Express mail or overnight delivery by an express service carrier
• Personal delivery

Certified mail with return receipt is the practical standard — the receipt and the green card prove the date and recipient. Plain first-class mail and email do not satisfy §§ 8110–8118 on their own.

Step 4: Keep your proof of service

Save the certified-mail receipt, the return receipt, and a signed proof of service. When you mail the notice, service is legally complete on the date of deposit with the postal service (Cal. Civ. Code § 8116) — so a notice mailed on the deadline is timely even if it arrives afterward.

Notice Harbor handles all four steps for you: it identifies recipients, verifies addresses against USPS records, mails by Certified Mail with return receipt, and gives you a court-ready proof of service.

This page is general information, not legal advice, and does not create an attorney–client relationship. California lien and notice deadlines are strict and fact-specific — “completion” alone can be triggered by actual completion, the owner’s occupancy or use, or a 60-day cessation of labor. Notice Harbor is not a law firm. Confirm any deadline that matters to your claim with a licensed California construction attorney.