Bigfirmlit is a non-attorney, self-help legal document support service. We are not a law firm and do not provide legal advice. Services are California LDA compliant.
You finished the job. You delivered the materials. And now the property owner — or the general contractor above you — isn't paying. It's one of the most common and most infuriating situations in construction.
Here's what most contractors don't know: California law gives you a powerful tool that attaches directly to the property itself. It's called a mechanics lien, and it can stop an owner from selling or refinancing until your debt is resolved. You don't need to go through collections or chase someone down. The lien rides with the land.
This guide walks through exactly how to use it — who qualifies, the critical deadlines, what goes in the lien, how to record it, and what happens if you need to enforce it.
What Is a Mechanics Lien and Why Does It Work?
A mechanics lien is a legal claim recorded against real property that secures payment for labor, materials, or services contributed to improving that property. Once recorded, the lien becomes part of the public title record.
That matters because:
- It follows the property. If the owner sells, the lien stays attached. The buyer either pays it off or inherits the problem.
- It blocks clean title. Title companies won't insure a property with an unresolved lien. That means the owner can't sell or refinance without dealing with your claim.
- It gives you leverage. A lien turns an unpaid invoice into a secured interest in real estate.
California's mechanics lien law is codified in Civil Code §8000–§9566 (the California Mechanics Lien Law). The deadlines and procedures are strict — but if you follow them, this is one of the most effective collection tools available to contractors.
Who Can File a Mechanics Lien in California?
California's mechanics lien law covers a broad range of claimants. You can file if you contributed to improving the property and weren't paid — even if you don't have a direct contract with the owner:
- General contractors (direct contractors) — those with a direct contract with the property owner
- Subcontractors — licensed or unlicensed, hired by the GC or another sub
- Material suppliers — companies that provided lumber, concrete, fixtures, or other supplies
- Equipment lessors — companies that rented equipment used on the job
- Design professionals — architects, engineers, surveyors
- Laborers — workers who contributed labor to the improvement
One important note on licensing: an unlicensed contractor can still file a mechanics lien, but the ability to enforce it in court may be limited by California's contractor licensing law. If you're required to be licensed and aren't, consult a resource before proceeding.
Step 1: The Preliminary Notice — The Most Common Mistake
Before you can record a mechanics lien, there's a prerequisite that trips up contractors every year: the 20-day preliminary notice (Civil Code §8200–§8216).
Who must serve it?
Direct contractors (general contractors): You are NOT required to serve a preliminary notice on the property owner. Your contract with the owner establishes your rights.
Subcontractors, material suppliers, equipment lessors, and others who don't have a direct contract with the owner: You MUST serve a 20-day preliminary notice. This is non-negotiable. Failure to serve it will waive your lien rights entirely for work performed before the notice.
The 20-day rule
The notice must be served within 20 days of first furnishing labor, materials, or services on the project. If you serve it late, you don't lose all your rights — but you only preserve lien rights for work performed in the 20 days before you served the notice and after. Everything before that window is gone.
Serve preliminary notice on:
- The property owner (or reputed owner)
- The general contractor (if you're a sub)
- The construction lender, if any (the lender's identity is usually listed on the building permit or can be found via county records)
How to serve it: First-class certified mail, registered mail, or personal delivery. Keep your proof of mailing — you'll need it later.
Why this matters so much
The preliminary notice isn't a legal threat. It's a paperwork requirement that protects your future lien rights. Serve it at the start of every job, even if payment is going smoothly. If something goes wrong later, you'll be glad you did it.
Step 2: Know Your Filing Deadlines (Civil Code §8412/§8414)
Mechanics lien rights are time-limited. Miss the deadline and your lien rights are permanently lost — no exceptions.
Direct contractors
You have 90 days after completion of the work of improvement to record your lien.
"Completion" generally means the project is substantially complete, or has been abandoned, or a Notice of Completion or Cessation has been recorded by the owner.
Subcontractors and suppliers
You have the shorter of:
- 90 days after completion of the work of improvement, OR
- 30 days after the owner records a Notice of Completion or Cessation
This is why you need to monitor the county recorder's office. If an owner records a Notice of Completion the day after your last day on the job, your 30-day clock starts immediately — and you only have 30 days, not 90.
Practical advice
Don't wait until the deadline approaches. Track your last date of work. Set a calendar reminder for day 60. The time goes faster than you think, and assembling the lien takes preparation.
Step 3: What Goes in the Lien (Civil Code §8416)
A mechanics lien must contain specific information under Civil Code §8416 or it can be challenged. Required elements include:
- Claimant's name and address — your full legal name (or business name) and mailing address
- Owner's name and address — the owner of the property (check the county assessor records if you're unsure)
- Job site address and legal description — the street address and, if available, the APN (assessor's parcel number) or legal description from the deed
- Amount owed — the total unpaid balance, broken down if possible (labor, materials, etc.)
- Work or materials furnished — a general description of the work you performed or materials you supplied
- Date the work was last performed — important for establishing that you're within the filing deadline
The amount you claim must be accurate. Overstating the lien amount can be used to challenge the lien's validity. Be precise.
Step 4: Record the Lien at the County Recorder's Office
Once your lien document is prepared, you record it at the county recorder's office in the county where the property is located.
- Filing fees: Approximately $15–$25 per page (varies by county)
- Most counties accept in-person filing; some accept mail submissions
- You'll receive a stamped copy with the recording information — keep this
The lien must also include a proof of service on the owner, showing that you served the owner with a copy of the lien. This can be done before or after recording, but the owner must receive it.
Step 5: Serve the Lien on the Owner
Within 15 days of recording the lien, you must serve a copy on the property owner (Civil Code §8416(f)). Service can be made by:
- Personal delivery
- First-class certified mail to the owner's last known address
Keep your proof of service. If you later need to enforce the lien in court, you'll need to show that the owner was properly notified.
Step 6: Enforce the Lien — Filing a Foreclosure Lawsuit
Recording the lien is not the end of the process — it's the beginning of the leverage phase. If the owner still doesn't pay after the lien is recorded, you have one more step available: filing a lawsuit to foreclose on the lien.
You must file this lawsuit within 90 days of recording the mechanics lien (Civil Code §8460). If you don't file suit within that window, the lien becomes void and unenforceable — and you lose your security interest in the property.
This is why the mechanics lien process requires you to move quickly at every stage. Once you've recorded, the 90-day enforcement clock is running.
Need Help Preparing Your Demand Documents First?
Before recording a lien, many contractors find it effective to send a formal written demand. A well-drafted demand letter can prompt payment without escalating to a lien filing.
Get the Demand Letter Packet — $109.65
If you've already sent a demand and want to formalize a settlement position, the Settlement Demand Packet gives you the full framework:
Get the Settlement Demand Packet — $126.65
Common Mistakes That Kill Lien Rights
Even experienced contractors lose their lien rights due to procedural errors. The most common:
- Skipping the preliminary notice — if you're a sub or supplier, this is fatal. Serve it at the start of every job.
- Missing the filing deadline — track your last day of work and the recording deadline on a calendar. Courts do not grant extensions.
- Failing to serve the owner after recording — the 15-day service requirement is mandatory. Don't assume the county recorder notifies anyone.
- Filing in the wrong county — the lien must be recorded in the county where the property is physically located, not where you or the owner are based.
- Math errors in the amount claimed — double-check your figures. An inflated or inaccurate amount can be used to challenge the entire lien.
- Waiting too long to sue — recording the lien without following up with a foreclosure action within 90 days leaves you with nothing.
What Happens If You Win
If you file a foreclosure action and the court rules in your favor, the court can order the property to be sold to satisfy the debt. The proceeds from the sale go toward paying lienholders in order of priority, then to the owner if anything remains.
In practice, most property owners settle before a sale ever happens — the threat of a forced sale is usually enough. The mechanics lien process is designed to create that pressure.
Quick Reference: California Mechanics Lien Timeline
| Step | Who | Deadline |
|---|---|---|
| Serve preliminary notice | Subs/suppliers (not direct contractors) | Within 20 days of first furnishing |
| Record mechanics lien | All claimants | 90 days after project completion; 30 days after Notice of Completion (subs/suppliers) |
| Serve lien on owner | All claimants | Within 15 days of recording |
| File foreclosure lawsuit | All claimants | Within 90 days of recording |
Summary
California's mechanics lien law is one of the strongest payment-recovery tools available to contractors, subcontractors, and suppliers. But it only works if you follow the procedures exactly:
- Serve your preliminary notice on day one if you're a sub or supplier
- Track your filing deadline from your last day of work
- Record the lien at the county recorder with all required information
- Serve the owner within 15 days
- File suit to foreclose within 90 days if the owner doesn't pay
Miss any of these steps and the rights disappear. Follow them and you have a secured claim against real property — one of the most powerful positions a creditor can hold.
If you want to start with a formal written demand before escalating to a lien, Bigfirmlit can help you prepare that document.
Bigfirmlit is a non-attorney, self-help legal document support service. We are not a law firm and do not provide legal advice. Services are California LDA compliant. All content on this page is for informational purposes only and is not a substitute for legal advice from a licensed attorney.