Introduction
Unpaid work is a fact of life in California construction. When a general contractor, subcontractor, or supplier doesn't get paid, the mechanics lien remains the strongest tool for forcing the issue.
Payment delays are widespread. According to a 2025 Construction Payments Report, 82% of general contractors reported work being delayed or stopped because of payment issues on their projects.
Filing a lien looks straightforward on the surface. In reality, California Civil Code Sections 8000-8848 impose strict deadlines and notice requirements. Miss one, and you can waive your lien rights entirely — even on a claim that's completely valid.
This guide walks through the exact filing steps and what you need before you start. It also covers the deadlines that determine whether your lien holds up, common mistakes to avoid, and remedies to consider when a lien isn't the right fit.
Key Takeaways
- Contractors have 90 days after completion to record a lien; subcontractors' clock starts once work stops
- Without a direct contract with the owner, send a 20-Day Preliminary Notice to preserve lien rights
- Liens are recorded with the county recorder where the property sits; notarization isn't required
- A missed deadline or an inaccurate lien amount can invalidate an otherwise solid claim
- Recording the lien only starts the clock: enforcement (foreclosure) has its own deadline
How to File a Mechanics Lien in California: Step-by-Step Guide
Step 1: Send the 20-Day Preliminary Notice
If you don't have a direct contract with the property owner, meaning most subcontractors and material suppliers, you must send this notice within 20 days of first furnishing labor or materials under Civil Code Section 8200.
The notice goes to:
- The owner or reputed owner
- The direct contractor (if you're not one)
- The construction lender, if there is one
Miss the 20-day window? You're not automatically barred. A late notice still protects work furnished within the 20 days before you send it, and everything after. It just won't cover earlier work.
Direct contractors typically don't need to send this notice to preserve their own lien rights. Still, verify project-specific obligations. Some contracts impose notice duties that exceed the statutory minimum.
Step 2: Confirm You're Within the Filing Deadline
This is where most claims go wrong. Direct contractors generally have the earlier of 90 days after completion of the work of improvement or 60 days after the owner records a notice of completion.
Subcontractors and suppliers face a different rule. Their deadline runs from when they personally cease providing work, not from the overall project completion date. The outside limit is still the earlier of 90 days after project completion or 30 days after a recorded notice of completion.
Why this matters: miscalculating by even one day can waive your rights permanently. Given the stakes, it's worth having a construction attorney like Carno Law Group confirm your exact deadline before you act, rather than guessing based on a rough completion date.
Step 3: Prepare and Complete the Mechanics Lien Form
Your lien claim, under Civil Code Section 8416, must be a signed, verified written statement containing:
- Your demand amount, after deducting credits and offsets
- The owner's name, if known
- A general description of the work or materials furnished
- The name of the person who hired you or to whom you furnished the work
- A description of the property sufficient to identify it
- Your address
- The statutory "NOTICE OF MECHANICS LIEN" language in bold type
Once you've gathered these elements, one requirement often surprises contractors: no notarization is required in California. The recorder accepts a properly verified claim without acknowledgment. That said, accuracy matters enormously: an inflated or careless amount can expose you to a fraudulent lien challenge, so double-check every figure before you submit. Your Mechanics Lien should not include delay damages.
Step 4: Record the Lien With the County Recorder
Record your claim with the county recorder in the county where the property is located, along with the applicable recording fee.
Most counties allow recording in person, by mail, or electronically through an authorized e-recording provider. Contact your county recorder to confirm the current fee before you submit.
Step 5: Serve the Recorded Lien and Prepare to Enforce
Before or upon recording, serve a copy of the claim and statutory notice on the property owner. Certified mail, registered mail, or first-class mail with a certificate of mailing all satisfy the requirement. Failure to serve properly makes the lien unenforceable as a matter of law, no matter how well-drafted the claim itself is.
Recording the lien only preserves your claim. If payment still doesn't come through, you must file a foreclosure lawsuit within 90 days of recording — unless you and the owner have agreed to a credit arrangement and recorded a Notice of Credit, which can extend enforcement up to one year after project completion.
What You Need Before Filing Your California Mechanics Lien
Gathering the right paperwork upfront prevents rejected, delayed, or invalid claims. Before filing, assemble these three categories of documentation:
- Contract and project documentation: Signed contracts, purchase orders, invoices, and change orders that establish the scope and dollar value of your work.
- Preliminary notice compliance records: Proof of when and how you sent your 20-Day Preliminary Notice, such as certified mail receipts. Indirect claimants risk losing lien rights without proof of timely delivery.
- Accurate financial records: A clear accounting of what's owed, including retainage held and partial payments received. Your lien amount needs to hold up to scrutiny — sloppy math invites a challenge.
Key Deadlines and Factors That Affect Your Lien Claim
Even a well-drafted lien can fail if you misjudge one of these variables.
Factor 1: The 90-Day Recording Deadline This is the hard statutory cutoff tied to project completion or your last day furnishing labor or materials. Miss it, and you permanently forfeit the right to record a lien on that project. There's no extension or second chance.
Factor 2: Subcontractor "Cessation of Work" Rule Your deadline as a subcontractor doesn't start at overall project completion. It starts when you stop working, as confirmed in Precision Framing Systems, Inc. v. Luzuriaga, where a lien recorded before required corrective repairs were finished was deemed premature and void.
Timing cuts both ways: filing too early makes the lien invalid, while filing too late means it has already expired.
Factor 3: Lien Amount Accuracy California law separates a legitimate claim from an inflated one. Overstating your demand, even unintentionally, can expose you to liability. A claimant who willfully includes work never furnished to the property forfeits the lien entirely.
Factor 4: Foreclosure/Enforcement Window Recording only preserves your claim. A foreclosure lawsuit must follow within 90 days (or one year with a properly recorded Notice of Credit). Miss it, and the lien becomes unenforceable, though it may still cloud the property's title until you release it.
Common Mistakes to Avoid When Filing a Mechanics Lien in California
Payment disputes drag on. A Construction Dive survey found subcontractors waited an average of 56 days for payment, while general contractors often believed payment happened within 30. That gap in perception is exactly why lien rights matter — and why these mistakes are so costly:
- Missing the 20-Day Preliminary Notice deadline, which can bar indirect claimants from lien rights entirely
- Miscalculating the recording deadline, particularly the subcontractor cessation rule, which differs from a simple completion date
- Recording an inaccurate lien, whether from an incorrect property description or an inflated amount, risking invalidation or a fraudulent lien challenge
- Failing to release the lien promptly after payment, which can expose you to statutory penalties
Alternatives to Filing a Mechanics Lien in California
A mechanics lien isn't always the right tool, especially on public projects or when you want to preserve a client relationship.
| Alternative | Best Used When | Trade-Off |
|---|---|---|
| Stop Payment Notice | Reaching undisbursed funds held by a lender or public entity | Separate notice procedures; doesn't attach to real property |
| Payment Bond Claim | Working on public works projects, where mechanics liens aren't allowed | Claim runs against the bond, not the property; carries its own strict deadlines |
| Demand Letter or Attorney Consultation | Preserving a relationship, or the amount doesn't justify a full lien | Less legal leverage; depends on voluntary compliance |
Carno Law Group works with California contractors, subcontractors, and suppliers to evaluate which remedy fits their specific project and payment dispute. That might mean a lien, a stop notice, a bond claim, or a combination deployed together.
Facing a payment dispute on a California construction project? Carno Law Group offers a free initial consultation to help contractors, subcontractors, and suppliers protect their lien rights before deadlines run out. Call 949-540-0320 or visit the firm at www.carnolaw.com.
Disclaimer: This article is for general informational purposes only and is not legal advice. Reading this article or contacting Carno Law Group does not create an attorney-client relationship. An attorney-client relationship is formed only after Carno Law Group has been formally retained.
