How to File a California Mechanics Lien: Step-by-Step Guide

A mechanics lien is the most powerful legal mechanism available to contractors, subcontractors, and material suppliers in California to secure unpaid balances. By recording a claim of lien against the property where the work was performed, you prevent the owner from selling or refinancing the property without settling their debt. However, California courts enforce lien laws strictly. A single missing date, incorrect form, or late mailing will instantly invalidate your lien rights.

To successfully record and enforce a mechanics lien in California, you must navigate a series of precise statutory milestones under the California Civil Code (specifically §§ 8000–9566). If you are working outside the state, you can read our state-specific guides for a Texas mechanics lien or a Florida mechanics lien. This guide walks you through the step-by-step process, from preliminary notice to recording and final release.

The Mandatory 20-Day Preliminary Notice (§§ 8200–8216)

Before you can file a mechanics lien in California, you must satisfy a crucial pre-requisite: the 20-Day Preliminary Notice. With very few exceptions, failing to send this notice invalidates your right to record a lien.

• Who must send it: Every subcontractor, material supplier, and equipment lessor must serve this notice. A direct (general) contractor only needs to serve the notice to the construction lender, if one exists for the project.
• Who must receive it: The property owner, the direct contractor, and the construction lender (if applicable).
• The Deadline: The notice must be served within 20 days of the date you first furnished labor, services, equipment, or materials to the job site.
• Late notices: If you miss the 20-day window, you can still send the notice, but your lien rights will only cover work performed within the 20 days prior to the service of the notice and any work performed after. Any labor or materials furnished before that 20-day window are permanently excluded from your lien rights.
• Method of service: You must serve the notice via Registered Mail, Certified Mail (with return receipt requested), or overnight delivery. Hand-delivery is acceptable if you obtain a signed receipt.

The 90-Day Deadline to Record the Lien (§ 8412 & § 8414)

If you remain unpaid after completing your work, you must record the mechanics lien in the county where the property is located. The timeframe to record depends on whether the property owner files a Notice of Completion:

• Standard Deadline (90 Days): If no Notice of Completion is recorded, you must record your mechanics lien within 90 days of the date the project was completed. "Completion" can be defined as actual completion, occupation by the owner, or a cessation of labor for 60 consecutive days.
• Shortened Deadline (Notice of Completion): If the owner records a valid Notice of Completion or Notice of Cessation with the county recorder within 15 days of project completion, the deadline to record your lien is shortened:
  • Direct Contractors: Must record the lien within 60 days of the recording date of the Notice of Completion.
  • Subcontractors and Suppliers: Must record the lien within 30 days of the recording date of the Notice of Completion.

The 90-Day Deadline to Enforce the Lien (§ 8460)

A mechanics lien does not remain active indefinitely. It acts as a temporary hold on the property. In California, a mechanics lien is only valid for 90 days from the date it was recorded. Before this 90-day window expires, you must file a foreclosure lawsuit in a court of competent jurisdiction to enforce the lien.

If you fail to file a lawsuit within 90 days of recording the lien, the lien automatically becomes void and unenforceable. You cannot simply re-record the lien to extend the deadline—doing so is a violation of California law and can result in penalties. After filing the lawsuit, you must also record a Notice of Pendency of Action (Lis Pendens) with the county recorder to notify potential buyers and lenders of the active litigation.

Exact Form Requirements Under Civil Code § 8416

To record a valid mechanics lien, the document must be in writing, signed and verified under penalty of perjury, and contain the following statutory elements:

1. A statement of the claimant's demand after deducting all just credits and offsets.
2. The name of the owner or reputed owner, if known.
3. A general statement of the kind of work, services, equipment, or materials furnished by the claimant.
4. The name of the person by whom the claimant was employed or to whom the work was furnished.
5. A description of the site sufficient for identification (e.g., street address and legal description).
6. The claimant's address.
7. A specific statutory warning printed in at least 10-point boldface type: the "Notice of Mechanics Lien". This notice warns the owner that their property may be sold to satisfy the debt.

Filing with the County Recorder

Once the lien document is completed, signed, and notarized, it must be recorded in the county recorder's office of the county where the property is located. You can submit the lien in person, via mail, or through an approved electronic recording service. You must pay the county recording fee (typically $20 to $50 depending on the county and page count). Ensure the document is recorded before the 30-, 60-, or 90-day deadline.

Serving the Lien on the Owner

Before recording the lien, or immediately thereafter, you must serve a copy of the Claim of Mechanics Lien (including the required Notice of Mechanics Lien) on the property owner. Service must be made via Certified Mail, Registered Mail, or Express Mail to the owner's address. You must sign a Proof of Service Affidavit under penalty of perjury and file this affidavit along with the mechanics lien at the county recorder's office. If you fail to serve the owner and file the Proof of Service, the lien is completely void.

Releasing the Lien When Paid

Once the owner pays the outstanding balance, you have a legal obligation to release the lien. File a Release of Mechanics Lien form with the same county recorder's office where the lien was recorded. The release should contain the recording reference number of the original lien and state that the claim is satisfied. Failing to file a release within a reasonable timeframe after receiving full payment can expose you to liability for damages and attorney fees if the owner sues to clear their title.

California 20-Day Preliminary Notice Template

This California-specific notice is a strict legal requirement under CA Civil Code Section 8200. Failing to serve this notice to the owner, builder, and lender within 20 days of starting work completely voids your mechanics lien rights. Sending it secures your position on the project from the very beginning.