California’s mechanics lien requirements and deadlines are set out in Civil Code sections 8000 through 9566, and they run on a strict clock: serve a preliminary notice within 20 days of first furnishing labor or materials, record the lien within 30, 60, or 90 days of completion depending on your role and whether a notice of completion was filed, and file a lawsuit to foreclose within 90 days of recording. Miss any of those windows and the lien is gone, no matter how legitimate the underlying debt.
The Preliminary 20-Day Notice
Before you can record a valid mechanics lien, most claimants have to serve a preliminary notice within 20 days of first providing labor or materials to the project. This single step destroys more lien claims than anything else in the process.
The notice goes to the property owner, the general contractor, and the construction lender if one exists. Subcontractors and material suppliers at every tier must serve it. Direct contractors (those with a contract directly with the property owner) are generally exempt, with one exception: if a construction lender is financing the project, the direct contractor must serve the notice on the lender.
Serving the notice late doesn’t bar you entirely, but it shrinks your lien dramatically. A late preliminary notice only protects work performed within the 20 days before you actually sent it, plus anything you do after. Work from before that window is unrecoverable through a lien. A subcontractor who worked on a project for months before realizing the notice was never served will typically lose the bulk of the claim.
Recording the Lien Claim
Once the preliminary notice is handled, the next step is preparing the lien claim and recording it with the county recorder in the county where the property sits. Civil Code Section 8416 lists exactly what the claim must contain:
- Identification of the property owner (or reputed owner), the claimant, and the direct contractor
- A general statement of the labor, services, equipment, or materials provided
- The total amount owed after deducting all credits and offsets
- A description of the property sufficient to identify the site
- The claimant’s address
- A proof of service affidavit showing the date, place, and manner the lien was served on the property owner
- The required boldface notice statement warning the property owner about their rights and the foreclosure timeline
The claim must be verified under penalty of perjury by the claimant or an authorized agent.1California Legislative Information. California Civil Code 8416
After recording, serve a copy of the lien on the property owner by personal delivery or certified mail. Section 8416 requires the proof of service affidavit to be part of the recorded document itself, so keep that proof clean; without it the lien’s validity can be attacked.1California Legislative Information. California Civil Code 8416
Recording Deadlines at a Glance
The deadline for recording depends on your role on the project and whether the owner or general contractor has filed a notice of completion or notice of cessation.
- If no notice of completion or cessation is filed, every claimant has 90 days after the project is complete, or after a continuous 60-day work stoppage, to record.
- If a notice of completion or cessation is filed, direct contractors have 60 days from the recording of that notice. Subcontractors and material suppliers have only 30 days.2California Contractors State License Board. Homeowner’s Guide to Preventing Mechanics Liens
Those shortened deadlines are where claims die most often. A property owner who records a notice of completion the moment the project wraps is starting a countdown that many subcontractors don’t realize has begun. If there is any question about whether a notice has been filed, check the county recorder’s records directly. A premature notice of completion filed while work is still ongoing can be challenged and may not trigger the shortened deadlines, but that is a fight you’d rather avoid by filing early.
Enforcing the Lien in Court
Recording is only half the job. If the property owner still doesn’t pay, you have 90 days from the recording date to file a lawsuit to foreclose on the lien. Miss that window and the lien expires automatically.
There is one narrow exception. If you and the property owner agree in writing to extend credit, and you record notice of that credit extension within 90 days of recording the lien, the enforcement deadline moves to 90 days after the credit period expires, with an outside cap of one year after completion of the work.3California Legislative Information. California Civil Code CIV 8460
The foreclosure suit is filed in superior court in the county where the property sits. The complaint describes the work performed or materials supplied, the amount owed, and shows that each procedural step was followed. Name every party with an interest in the property: the owner, the general contractor, other lienholders, and any lender with a deed of trust. That lets the court sort out competing claims in a single action.
Within 20 days of filing, record a lis pendens (notice of pending litigation) with the county recorder. That puts future buyers and lenders on notice that the property is subject to an active lien dispute. Without it, someone could acquire the property with no knowledge of the claim.
If the court rules for you, the judgment will order the property sold at auction, and the proceeds will pay off valid liens according to their priority.
Lien Waivers Along the Way
Lien waivers travel with payment on almost every California job. State law requires one of four statutory forms set out in Civil Code sections 8132, 8134, 8136, and 8138; a non-conforming waiver can be unenforceable, so both sides should stick to the templates.4California Contractors State License Board. Conditional and Unconditional Waiver and Release Forms
The four forms split along two axes, whether the waiver is conditional or unconditional and whether it covers a progress payment or the final payment:
- Conditional waiver on progress payment: used when a progress payment is expected but not yet received, and it only takes effect once that payment actually clears.
- Unconditional waiver on progress payment: used after a progress payment has been received, taking effect immediately on signing.
- Conditional waiver on final payment: waives all remaining lien rights for the project, but only after the final payment clears.
- Unconditional waiver on final payment: used after the last payment has been received and confirmed, permanently waiving all lien rights on the project.
The conditional/unconditional split is the one to watch. A conditional waiver protects you if the check bounces. An unconditional waiver takes effect the moment you sign, whether or not the money ever lands. Signing an unconditional waiver before you have confirmed funds is one of the costliest mistakes in construction payment, and those rights are nearly impossible to recover.
When a Mechanics Lien Isn’t the Right Tool
Mechanics liens attach to private property. On public construction projects you cannot place a lien on government-owned property, so the primary tool is a stop payment notice served on the public agency, which directs the agency or lender to set aside project funds to cover your claim. On private projects you can file both a mechanics lien and a stop payment notice at the same time, using the same preliminary notice to support both. A stop payment notice served on a private construction lender generally has to be accompanied by a bond; on public projects an unbonded notice is valid. The enforcement deadline mirrors the lien timeline: suit within 90 days of serving the notice.
Federal projects are off the mechanics lien grid entirely. Under the Miller Act (40 U.S.C. §§ 3131–3133), prime contractors on qualifying federal jobs must post payment bonds, and unpaid subcontractors and suppliers bring claims against those bonds rather than filing liens.5Office of the Law Revision Counsel. 40 USC 3133 – Rights of Persons Furnishing Labor or Material
Priority Against Other Creditors
When several creditors claim the same property, the order of payment from a foreclosure sale depends on lien priority. California applies a version of the “relation back” doctrine to mechanics liens: a lien can relate back to the date work on the project first began, rather than the date the lien was recorded. A construction lender that recorded its deed of trust after work started can find its mortgage subordinate to mechanics liens recorded later. That is why lenders typically require the site to be free of any work before they record their loan documents, and why the start-of-work date is often the decisive fact in a priority dispute.
What Goes Wrong, and What It Costs
The ordinary penalty for a procedural mistake is losing the lien. Miss the preliminary notice, miss the recording deadline, miss the 90-day enforcement deadline, and the lien is either void from the start or unenforceable going forward. Courts will not revive it.
Filing a lien with false or exaggerated information is a different kind of problem. Under Civil Code Section 8424, a property owner harmed by a wrongful lien can sue the claimant for compensatory damages and attorney’s fees, and punitive damages are available if the claimant acted with malice.6California Legislative Information. California Civil Code 8424 Contractors who file improper liens can also face discipline from the Contractors State License Board, up to suspension or revocation of the license.7California Contractors State License Board. Mechanics Lien
One trap catches unlicensed contractors in particular. Anyone can technically record a mechanics lien, but an unlicensed contractor cannot foreclose on one if the work is valued at more than $500.8California Contractors State License Board. What if a Mechanics Lien is Filed on Your Property Recording a lien you can never enforce doesn’t just waste time; it can open the door to a wrongful lien claim from the owner.
The through-line of every one of these deadlines and forms is documentation. Keep your preliminary notice proof of service, your recorded lien with its proof of service affidavit, your waiver copies, your contracts, change orders, and daily logs. The claimant with clean records has a working lien. The one without usually doesn’t.