Introduction
Subcontractors sit at the bottom of the construction payment chain, and the numbers show exactly how exposed that position is. According to a 2025 report by American Express and PYMNTS, 71% of subcontractors reported delayed payments from general contractors by the end of 2023.
Specialty trades, material suppliers, equipment lessors, and haulers all share the same vulnerability: when a GC runs short on cash or an owner disputes a payment, lower-tier parties absorb the loss first.
California mechanics lien law gives subcontractors a powerful legal remedy: the right to place a claim directly against the property where their work added value. But that right only exists if strict procedural rules are followed. Miss a deadline by a single day and the remedy disappears entirely, regardless of how much money is owed.
The questions below break down exactly how that process works — and what it takes to protect your claim.
Key Takeaways
- Send preliminary notice within 20 days of first furnishing labor or materials — this step is mandatory for subcontractors to preserve lien rights
- Filing deadlines are 30 days after a recorded Notice of Completion, or 90 days after project completion when no notice is recorded
- No written contract is required — authorized work alone is sufficient to support a lien claim
- Mechanics liens do not apply to public works projects; subcontractors on public jobs must use stop payment notices and bond claims instead
- Missing any deadline permanently forfeits your lien rights — there is no exception or cure once the window closes
Understanding Subcontractor Mechanics Liens
Question 1: What Is a Subcontractor Mechanics Lien?
A mechanics lien is a legal claim recorded against real property that secures payment for labor, materials, or services contributed to a construction project. Once recorded with the County Recorder, it "clouds" the property's title — making it difficult for the owner to sell, refinance, or draw on construction financing until the underlying debt is resolved.
For subcontractors, the lien works differently than it does for a general contractor. Because there's no direct contract with the property owner, the lien operates against the property itself, capturing the value the subcontractor's work added to it. California Civil Code § 8400 establishes this right for any person providing authorized work on a work of improvement.
The practical leverage is real: recording a lien doesn't guarantee payment, but it creates immediate financial pressure. A clouded title has consequences the owner and GC feel directly — stalled refinancing, blocked sales, lender holds. That pressure alone prompts many disputes to settle before any lawsuit is filed.
Question 2: Who Can File a Mechanics Lien in California?
California's lien law covers a wide range of construction participants. Under Civil Code §§ 8400 and 8048, the following parties have lien rights when they provide authorized work on a private improvement:
- Direct contractors (prime/general contractors)
- Subcontractors at any tier — including second-tier subs and sub-subcontractors
- Material suppliers and materialmen
- Equipment lessors
- Laborers
- Design professionals (licensed architects, engineers, land surveyors)
- Haulers and other service providers contributing to the improvement
Civil Code § 8046 explicitly defines subcontractors to include parties contracting with another subcontractor — not just those contracting directly with the general contractor. Second-tier and third-tier subcontractors both qualify, provided they follow the required procedures — a point that surprises many parties who assume lien rights stop at the first tier.
Preliminary Notice: The Essential First Step
Question 3: What Is a Preliminary Notice and Does a California Subcontractor Need to Send One?
A preliminary notice — commonly called a "20-day preliminary notice" — is a formal written notice informing the property owner, general contractor, and construction lender that the subcontractor is furnishing work or materials on the project. Serving it on time is what keeps lien rights intact under California law.
For subcontractors without a direct contract with the property owner, sending a preliminary notice is mandatory under California Civil Code § 8200. Failure to serve it typically forfeits lien rights entirely — not just for some of the work, but for all work performed prior to the required notice period.
Who must receive the preliminary notice:
- The property owner or reputed owner
- The direct contractor or reputed direct contractor
- The construction lender or reputed construction lender (if one exists)
All three parties must be served. Laborers are the primary exception — they are not required to give preliminary notice under § 8200. Licensed subcontractors who fail to serve the required notice on contracts exceeding $400 may face disciplinary consequences under Civil Code § 8216.
Question 4: When and How Must the Preliminary Notice Be Sent?
Knowing who to serve only gets you halfway there. The timing and delivery method are equally non-negotiable.
The 20-day rule: Under Civil Code § 8204, the preliminary notice must be served no later than 20 days after first furnishing labor or materials on the project.
If sent late, lien rights are preserved only for work provided in the 20 days before the notice was served — and for all work performed after service. Any unpaid work done earlier than that 20-day window is unprotected. On a project where the bulk of the work happened in the first month, a late notice can eliminate most of the recoverable amount.
Acceptable delivery methods under California law (Civil Code §§ 8106–8110):
| Method | Notes |
|---|---|
| Personal delivery | Complete upon delivery |
| Registered mail | Deposited with USPS |
| Certified mail | Deposited with USPS |
| Express mail | Overnight carrier acceptable |
Retain proof of service: Civil Code § 8118 requires documentation identifying the notice type, date, place, manner, and recipient. For mailed notices, keep USPS receipts, tracking confirmations, or return receipt cards.
The practical takeaway: treat the preliminary notice as a standard business process on every project, not a reaction to payment problems. By the time trouble starts, the 20-day window may already be closed.
Filing Deadlines and What Goes in Your Lien
Question 5: How Long Does a Subcontractor Have to File a Mechanics Lien in California?
California operates on a two-track deadline system under Civil Code § 8414:
- No Notice of Completion recorded: Subcontractors have 90 days from completion of the work of improvement to record their lien
- Notice of Completion recorded by the owner: Subcontractors have only 30 days from the date of recordation
What counts as "completion" under Civil Code § 8180 includes:
- Actual completion of the work
- Occupation or use by the owner accompanied by cessation of labor
- Continuous cessation of labor for 60 consecutive days
The 30-day track is the one that catches subcontractors off guard. An owner who records a Notice of Completion promptly after project closeout compresses the filing window dramatically, and subcontractors who don't monitor county recorder filings may miss it entirely. These deadlines are statutory and mandatory — miss either one and lien rights for that project are permanently gone.
Question 6: What Can a Subcontractor Include in a California Mechanics Lien Claim?
Under Civil Code § 8430, the lien amount is limited to the lesser of the reasonable value of work provided or the price agreed between the claimant and contracting party. If the contract was rescinded, abandoned, or breached, the cap is the reasonable value of the work actually performed.
Amounts properly included in a lien claim:
- Unpaid contract balance for completed work
- Authorized change orders and extra work, to the extent included in the agreed price or reasonable value
- Unpaid retention
- Costs of labor, materials, equipment, and services furnished for the project
Civil Code § 8422 addresses willful overstatement. A lien is not automatically invalidated by erroneous information unless there is intent to defraud or a bona fide innocent third-party owner is affected. However, willfully including labor, services, equipment, or materials not actually furnished for the property results in forfeiture of the lien. Don't inflate the claim. The short-term temptation isn't worth the risk of losing the entire remedy.
Filing and Enforcing Your Mechanics Lien
Question 7: How Does a Subcontractor File a Mechanics Lien in California?
The lien must be recorded with the County Recorder in the county where the property is located. Under Civil Code § 8416, the Claim of Mechanics Lien must be a written, signed, and verified document containing:
- Claimant's identity and address
- The demand (amount owed) after any credits
- Owner or reputed owner (if known)
- General statement of work performed
- Name of the person who employed the claimant or to whom work was furnished
- Sufficient description of the property (legal description or address)
- Proof of service affidavit
- The statutory "NOTICE OF MECHANICS LIEN" language in at least 10-point boldface type
Service on the owner is required. After recording, a copy of the lien must be served on the property owner by registered mail, certified mail, or first-class mail with a certificate of mailing. Failure to serve as required makes the lien unenforceable as a matter of law under § 8416. Keep documentation of every step.
Question 8: What Happens After Filing — How Does a Subcontractor Enforce a Mechanics Lien?
Recording the lien is step one. If the debt remains unpaid, the subcontractor must file a foreclosure lawsuit within 90 days of recording the lien — this deadline is set by Civil Code § 8460. Miss that window and the lien expires and becomes unenforceable.
Beyond the 90-day window, your options narrow sharply. Two additional tools matter here:
- Credit extension agreement: The only statutory extension requires a recorded agreement executed within the original 90-day period. Suit must still be filed within 90 days of credit expiration and no later than one year after project completion.
- Lis Pendens: When a foreclosure suit is filed, recording a Notice of Pendency of Action puts all subsequent purchasers and encumbrancers on notice, deepening the cloud on title and pushing parties toward settlement.
Many lien disputes resolve before trial. The cloud on title creates real economic consequences — blocked refinancing, stalled sales, disrupted construction lending — that motivate owners and GCs to negotiate. When settlement fails, litigation follows. Carno Law Group represents subcontractors in mechanics lien enforcement actions throughout Orange, Los Angeles, Riverside, San Bernardino, and San Diego Counties.
Special Situations Subcontractors Should Know About
Question 9: Can a Subcontractor File a Mechanics Lien Without a Written Contract?
Yes. California does not require a written contract to file a mechanics lien. Civil Code § 8400 conditions lien rights on authorized work — not a written agreement. An oral or implied agreement authorizing the subcontractor to perform work on the project is legally sufficient.
The critical factor is whether the work was performed with the knowledge or consent of the property owner — either directly or through the general contractor. Under California law, a property owner need not personally enter into the agreement; authorization through the GC is sufficient to establish lien rights.
That said, the practical challenge with oral agreements is proof. Without a written contract, subcontractors should document authorization using every available method:
- Emails and text messages directing or acknowledging the work
- Signed delivery receipts and invoices
- Job site logs and daily reports
- Photographs showing work in progress
- Payment records from the GC
The lien right exists without a written contract. The ability to enforce it under challenge depends heavily on the evidence assembled.
Question 10: Can Subcontractors File Mechanics Liens on Public Works Projects in California?
No. Mechanics liens cannot be filed against public property in California. Government-owned properties are not subject to forced sale, which eliminates the core mechanism that makes a mechanics lien enforceable.
Subcontractors on public works projects have two alternative remedies — each with its own strict deadlines:
Stop Payment Notice (Civil Code §§ 8500, 9356):
- Effective if served within 30 days after a Notice of Completion, acceptance, or cessation is recorded
- Or within 90 days after completion or cessation if no notice is recorded
- Enforcement action required between 10 and 90 days after the stop payment notice period expires
Payment Bond Claim (Civil Code §§ 9550–9566):
- California Little Miller Act requires payment bonds on public contracts over $25,000
- Bond notice must be given within 15 days after a Notice of Completion is recorded, or within 75 days after completion if no notice is recorded
- Suit must be filed no later than six months after the stop payment notice period closes
Federal Miller Act (40 U.S.C. §§ 3131, 3133):
- Applies to federally funded public works projects
- Second-tier subcontractors must serve notice to the prime contractor within 90 days of last furnishing
- Suit may not be filed earlier than 90 days after last furnishing, and no later than one year after last labor or materials
Frequently Asked Questions
Can a subcontractor file a mechanics lien without a contract?
Yes. California law requires authorized work, not a written contract. An oral agreement or implied authorization qualifies as a valid basis for a lien claim under Civil Code § 8400. Document the authorization through emails, texts, invoices, and job site records.
What is the difference between a lien and a mechanics lien?
A "lien" is a general legal term for any claim against property used as security for a debt. A "mechanics lien" is the specific version available under California construction law — it protects contractors, subcontractors, and suppliers who improve real property but don't get paid for that work.
How long does a subcontractor have to file a mechanics lien in California?
California subcontractors generally have 90 days from project completion to record a lien — reduced to 30 days if the owner records a Notice of Completion. Missing either deadline permanently forfeits lien rights for that project.
Do California subcontractors need to send a preliminary notice before filing a mechanics lien?
Yes. Preliminary notice is mandatory for subcontractors without a direct contract with the owner. Send it within 20 days of first furnishing labor or materials. Missing this window eliminates lien rights for work performed before the required notice period.
Can a subcontractor file a mechanics lien on a public works project in California?
No. Mechanics liens cannot be filed against public property. Subcontractors on public works projects must pursue a Stop Payment Notice or a Payment Bond Claim under the California Little Miller Act, each with their own notice and filing deadlines.
What happens if a subcontractor misses the mechanics lien deadline in California?
Missing the deadline forfeits lien rights for that project. The subcontractor may still have other remedies: breach of contract claims, stop payment notices if still timely, or bond claims on public projects. But consult a construction attorney immediately, as those windows close quickly too.
