How to Serve a 20-Day Preliminary Notice in California: Exact Steps, Form, and Deadlines

You already know you need this notice. You've heard what happens if you skip it. Now you need to get it done correctly, today, before another day of work goes by without protection.

This is the action guide. If you want the full legal background — who must serve, what happens to late notices, how it fits into the California lien timeline — read the comprehensive California preliminary notice guide. This page is for doing it, not reading about it.

Before You Start: 3 Things You Need to Know

1. Your deadline is probably already running. The 20-day clock started on the first day you delivered materials or performed work on this project. Check that date. Calculate 20 days from it. That's your deadline. If you're past it, skip to the late-service section below — you may still have partial protection.

2. You need three addresses. The notice goes to three parties: the property owner (or reputed owner), the general contractor (or whoever hired you), and the construction lender (if there is one). Get these before you start filling out the form.

3. Certified mail, return receipt requested — every time. This is the most reliable service method. The postmark date is your proof of service date, even if the notice gets returned undelivered. Keep every receipt.

Step 1: Find the Three Addresses

The Property Owner

Don't rely on what the GC tells you. Look it up independently.

• Go to the county assessor's website for the county where the project is located
• Search by property address
• The assessor roll will show the owner of record and often a mailing address
• Cross-check with the county recorder (look for the most recent deed)

If the property is held in an LLC or trust, address the notice to the LLC/trust by name.

The General Contractor

Usually straightforward — this is on your contract or subcontract agreement. If you're not sure, check the building permit (available at the city/county building department, often online). The GC's license number and address are typically on the permit.

The Construction Lender

This step is skipped more often than it should be. Check the county recorder's office for a deed of trust or mortgage recorded around the time construction started. The lender (beneficiary) named in that document is your construction lender.

If you search and genuinely cannot find a construction lender, note that in your records. If there's no construction loan, you simply omit that party from your notice.

Step 2: Fill Out the Notice Form

California's Civil Code §8102 and §8204 specify exactly what must be in the preliminary notice. Here is each required field:

• Claimant Name and Address — Your legal business name and your business mailing address
• Name and Address of the Person Who Hired You — The party you have a direct contract with
• Description of Labor/Services/Materials — Keep it general but accurate (e.g., "Plumbing rough-in, fixtures, and finish plumbing work")
• Estimated Value of Work — A good-faith estimate of the total value; your contract value if you have a fixed bid
• Description of the Jobsite — The street address is sufficient
• Name and Address of the Owner or Reputed Owner
• Name and Address of the Construction Lender (if known)

The Mandatory Statutory Warning (Residential Projects)

If this is a residential project, you must include this exact language in at least 10-point bold type:

NOTICE TO PROPERTY OWNER: If bills are not paid in full for the labor, services, equipment, or materials furnished or to be furnished, a mechanic's lien leading to the loss, through court foreclosure proceedings, of all or part of your property being so improved may be placed against your property even though you have paid your contractor in full. You may wish to protect yourself against this consequence by (1) requiring your contractor to furnish a signed release by the person or firm giving you this notice before making payment to your contractor, or (2) any other method or device that is appropriate under the circumstances.

This is required by Civil Code §8202. Copy it exactly. Do not paraphrase. If you're not sure whether the project is residential, include it anyway — there's no penalty for including it on a commercial project, but there is risk if you omit it on a residential one.

Step 3: Make Copies

Before you seal anything: make one copy for your file (or scan to PDF), and make one copy per recipient. Each party gets a separate envelope.

Step 4: Send by Certified Mail — Each Recipient Gets a Separate Envelope

Do not combine recipients in one envelope. Each party gets their own certified mail envelope.

At the post office:

1. Put the notice in an envelope addressed to the recipient
2. Request certified mail, return receipt requested (green card)
3. The postal clerk applies the certified mail sticker with a tracking number
4. You pay the postage
5. Keep the receipt — this is your proof of mailing date

You do not need the signed green card to prove service. California courts have held that the mailing date on the certified mail receipt is the service date, regardless of whether the recipient signs for it.

Step 5: Calendar the Key Dates

Event	Date	Notes
First furnishing	[Date]	Day 1 of work/delivery
Notice service date	[Date]	Date of postmark
Protected-from date	[Date]	20 days before notice date
Last furnishing	[Date — update as work continues]	Updates your lien deadline
Mechanics lien deadline	90 days after completion/cessation	Track carefully

For the full lien filing process, see the California mechanics lien guide.

If You're Serving Late: What You Can Still Protect

If you're past 20 days from your first furnishing date, serve the notice today — right now. Don't wait.

How late notice works: Your lien protection starts from 20 days before the date you serve the notice. Work and materials furnished before that window are not protected.

Practical calculation:

• You first furnished on March 1
• You're serving notice on April 10
• Your protected period begins March 21 (20 days before April 10)
• Work/materials March 1–20 = not protected
• Work/materials March 21 and later = protected

Common Errors That Invalidate the Notice

Wrong owner name or address. If the property is owned by an LLC and you sent it to an individual, the notice may fail. Use the entity name that appears on the deed.

Forgot the construction lender. If there's a construction lender and you didn't notify them, your lien may not take priority over the construction loan.

Missing statutory warning on residential projects. If the warning language isn't included verbatim in 10-point bold type on a residential project, the notice is defective.

Sending regular mail instead of certified mail. Regular mail is not a valid service method for this notice.

Sending one envelope to multiple recipients. Each party must receive their own separately addressed envelope with their own certified mail tracking number.

Serving only the GC, not the owner. The GC service alone doesn't preserve lien rights against the owner. Both must receive the notice.

Quick-Reference Checklist

• Owner's legal name and correct mailing address confirmed (county assessor)
• GC's legal name and address from contract or building permit
• Construction lender identified (county recorder) or confirmed absent
• Notice form completed with all 7 required fields
• Statutory warning included (if residential project)
• Notice signed and dated
• Separate copy made for each recipient
• Separate certified mail envelope prepared for each recipient
• All envelopes sent certified mail, return receipt requested
• Certified mail receipts retained for each envelope
• Project calendar updated with notice date and upcoming deadlines

If you're later paid in full and release any mechanics lien you file, see the mechanics lien release guide for how to clear the title after payment.

20-Day Preliminary Notice FAQ

This is not legal advice. Consult a licensed California attorney for advice specific to your situation.