How to File a Mechanics Lien in California

If you build in California, you’ve probably been here before: the work is finished, the invoice is past due and the payment still hasn’t shown up. A mechanics lien is one of the strongest tools you have to get paid, but California only rewards those who follow the rules exactly. Miss a deadline by a day, and your lien rights can disappear.

Below, we’ll show you how to file a mechanics lien in California, from serving the preliminary notice that protects your rights from day one to meeting the state’s strict recording deadlines, completing the paperwork correctly and enforcing your lien before it expires.

The Unforgiving California Timeline: The 90-Day Rule

California gives you 90 days to record a mechanics lien, counted from completion of the entire project (what the law calls the “work of improvement”), not from your last day on the job.

Under Civil Code Sections 8412 and 8414, you can record once your own work is finished but no later than 90 days after the whole project is complete. If you miss it, you lose the lien.

However, 90 days is a ceiling, not a guarantee: an owner can shorten it, as explained below.

Cessation of Labor vs. Actual Completion

In California, “Completion” doesn’t always mean the job is done. Under Civil Code Section 8180, any of these can count as completion and will start your clock:

The work is actually finished.
The owner moves in or starts using the property, and work stops.
Work stops for 60 days in a row.
Work stops for 30 days in a row, and the owner records a Notice of Cessation.

This matters most on stalled jobs. If a project sits idle for 60 days, your 90 days may already be running, even if everyone expects crews to come back.

When a Notice Cuts Your Window to 30 or 60 Days

The owner can shorten your timeline by recording a Notice of Completion or a Notice of Cessation. If they do, your deadline becomes:

60 days after the notice is recorded if you’re a direct contractor (you contracted with the owner)
30 days after the notice is recorded if you’re a subcontractor, supplier or laborer

A Notice of Completion only counts if the owner records it on or within 15 days after actual completion. If it’s recorded late, the full 90 days applies again. Still, keep an eye on the county recorder’s records for your project. An owner’s filing can cut your window to as little as 30 days without you knowing.

California-Specific Filing Requirements

Before we move on to how to file a mechanics lien in California, it’s important to know that California expects some groundwork to already be done. These requirements are where many otherwise valid claims fail.

The 20-Day Preliminary Notice

If you didn’t contract directly with the owner, a 20-day preliminary notice is what makes your lien rights valid in the first place. Serve it to the owner, the direct contractor and any construction lender within 20 days of first furnishing labor or materials.

A late notice still works, but it covers only the 20 days before you served it and anything after.

The Required “Notice of Mechanics Lien” Warning

Under Civil Code Section 8416, every lien must include a “NOTICE OF MECHANICS LIEN” warning, in the statute’s exact wording and in at least 10-point boldface type. Avoid paraphrasing this language.

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

With your notices in place and your deadline mapped out, the filing comes down to five steps. Each one can go wrong in its own way, so follow them in order. For the bigger picture, our team at Construction Notice Services (CNS) also has a full breakdown of California mechanics lien law.

Step 1: Preparing a Compliant Lien Document

California doesn’t have one official lien form. Civil Code Section 8416 sets what the lien must say, and state recording standards control formatting, such as margins, page size and the return-address block. Fees and some procedures vary by county.

Start with a document that covers every statutory element, check it against the recorder’s requirements and have it signed and verified before you file.

Step 2: Stating the Right Value Amount

Your lien should cover the value of the labor, materials and equipment you actually furnished, minus payments and credits. Leave out attorney fees, late charges and interest, even if your contract allows them.

Accuracy matters. Under Civil Code Section 8422, honest errors in the amount generally won’t void a lien, but a lien made with intent to defraud is invalid, and willfully including labor or materials that weren’t furnished for the property forfeits it.

Step 3: Verifying the Property Description via the County Assessor

The lien needs a property description that clearly identifies the site. A street address may be enough, but an APN or legal description makes the lien harder to challenge.

Get the assessor’s parcel number and, ideally, the full legal description from the county assessor or recorder, and confirm the current owner of record at the same time.

Step 4: Serving the Owner Before Recording

Before you record, mail a copy of the lien, including the required warning notice, to the owner by registered mail, certified mail or first-class mail with a certificate of mailing. If you can’t serve the owner, the statute lets you serve the construction lender or the original contractor instead.

The person who mailed the copy signs a proof of service affidavit, and that affidavit has to be part of the lien when you record it. Without proper service, the lien is unenforceable.

Service is one of several rules and timelines for California preliminary notices and mechanics liens that run on a tight schedule.

Step 5: Recording with the Correct County Recorder’s Office

Record the lien in the county where the property sits, not where your business is based, and do it before your deadline closes.

Recording fees vary by county, so budget for them along with the other costs of filing a mechanics lien in California. If you’d rather not manage 58 different county offices yourself, our team at CNS handles lien filings across California.

California Roadblocks: What Happens After You File?

Recording the lien doesn’t get you paid. It starts a new set of deadlines and complications, and the one below is among the most common traps to watch out for.

The Strict 90-Day Enforcement Window

Once your lien is recorded, a second 90-day clock starts. Under Civil Code Section 8460, you have 90 days from recording to file a lawsuit to foreclose the lien. If you miss that window, the lien becomes unenforceable.

One way to extend it is if the owner agrees to give you more time to get paid, and you record a notice of that agreement within that same 90 days. Even then, the lawsuit has to be filed no later than one year after the project is completed.