--- title: California 20-Day Preliminary Notice Requirements Explained slug: california-20-day-preliminary-notice description: Learn California 20-day preliminary notice rules, deadlines, and who must file. LienFlash makes filing fast, compliant, and certified in 2 minutes. published: 2026-05-24T15:23:35.485Z updated: 2026-05-24T19:47:03.963Z canonical: https://lienflash.app/blog/california-20-day-preliminary-notice author: Grant Larsen publisher: LienFlash --- # California 20-Day Preliminary Notice Requirements Explained If you're doing construction work in California and you skip the 20-day preliminary notice, you lose your lien rights — period. This guide breaks down exactly who must file, what the deadlines are, who gets served, and what the notice must contain under [California Civil Code § 8200](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8200.). ## What Is a California 20-Day Preliminary Notice? A California 20-day preliminary notice is a statutory document that subcontractors, material suppliers, and equipment lessors must serve on the property owner, general contractor, and construction lender before they can enforce a mechanics lien, stop payment notice, or payment bond claim. It is governed by [California Civil Code § 8200](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8200.) and is a condition precedent to lien rights — meaning no notice, no lien, no exceptions. The notice gets its name from the rule that it must generally be served within 20 days of first furnishing labor, services, equipment, or materials to the project. Miss that window and you can only protect work performed in the 20 days before you eventually serve the notice — everything before that is unprotected. ## Who Is Required to Serve a California Preliminary Notice? Every subcontractor, sub-subcontractor, material supplier, and equipment lessor who does not have a direct contract with the property owner is required to serve a preliminary notice under [California Civil Code § 8200](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8200.)(a). This covers virtually every trade on a typical job: electricians, plumbers, HVAC techs, roofers, drywall crews, painters, framers, concrete subs — if you're not the GC contracted directly with the owner, you need this notice. General contractors who have a direct contract with the owner are exempt from the 20-day preliminary notice requirement for mechanics lien purposes, but they are still required to serve a preliminary notice to the construction lender if one exists on the project ([Cal. Civ. Code § 8200](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8200.)(d)). Laborers are also exempt. Everyone else should assume they need to file. One practical note: even if you think you might have a direct contract with the owner, serve the notice anyway. It costs almost nothing compared to losing tens of thousands in unpaid invoices. ## What Is the Exact Deadline for Serving the Preliminary Notice in California? The deadline is 20 days from the date you first furnished labor, services, equipment, or materials to the project, as stated in [California Civil Code § 8204](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8204.). If you serve within that 20-day window, your lien rights are fully protected from day one of your work on the job. If you serve the notice late — after the 20-day window — your lien rights are only protected for labor and materials furnished in the 20 days before the date of service, plus everything after. Everything you furnished before that rolling 20-day lookback period is cut off and unprotected. Here's what that means in dollars: if you've been on a job for 60 days and have $80,000 of work in place before you realize you forgot to serve the notice, you might only be able to lien for the last 20 days' worth of work. That could be $25,000-$30,000 instead of the full $80,000. [lien deadline calculator](/tools/lien-deadline-calculator) ## Who Must Be Served With the California Preliminary Notice? Under [California Civil Code § 8202](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8202.), you must serve the preliminary notice on all of the following parties: **1. The property owner (or reputed owner).** Use the name and address from the building permit or the recorded construction trust deed. If you can't find it there, check county assessor records. **2. The general contractor (or reputed general contractor).** This is whoever hired you or whoever is running the job site. **3. The construction lender (or reputed construction lender), if any.** Check for a recorded Deed of Trust on the property. If there's a construction loan in place and you skip the lender, your stop payment notice rights are gone even if your lien rights survive. Failure to serve any one of these parties does not automatically void the notice as to the others. But to preserve all three remedies — mechanics lien, stop payment notice, and payment bond claim — you need to hit all three. ## How Must the California Preliminary Notice Be Served? [California Civil Code § 8106](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8106.) specifies three acceptable methods of service for a preliminary notice: **1. Personal service.** Hand the notice directly to the individual or, if an entity, to an officer or authorized agent. **2. First-class mail with Certificate of Mailing.** This is the minimum for mail service. A Certificate of Mailing from USPS proves you sent it, even if the recipient refuses or the letter is returned unclaimed. **3. Certified or registered mail with return receipt requested.** This is the gold standard and provides the strongest proof of delivery. The date of service by mail is the date of mailing, not the date of receipt ([Cal. Civ. Code § 8116](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8116.)). That matters — you can mail it on day 20 and it counts. But you need that Certificate of Mailing or certified mail receipt to prove it. If a notice is sent by mail and returned undelivered, it does not invalidate the notice as long as it was sent to the correct address ([Cal. Civ. Code § 8212](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8212.)). Keep every piece of documentation. ## What Information Must Be Included in the California Preliminary Notice? [California Civil Code § 8202](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8202.) requires the preliminary notice to contain the following information: - A description of the site sufficient for identification, including the street address if available - The name and address of the owner or reputed owner - The name and address of the direct contractor (general contractor) if applicable - The name and address of the construction lender, if any - A general description of the labor, service, equipment, or materials you are furnishing or will furnish - An estimate of the total price of the labor, services, equipment, or materials - The name and address of the party serving the notice (that's you) - The name and address of the person who hired you (your customer — the GC or other prime sub) California law also requires that you include a specific statutory warning notice to the owner. [Cal. Civ. Code § 8202](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8202.)(d) mandates this language verbatim on the notice when served on the owner: *"NOTICE TO PROPERTY OWNER: If bills are not paid in full for the labor, services, equipment, or materials furnished or to be furnished, a mechanic's lien leading to the loss, through court foreclosure proceedings, of all or part of your property being so improved may be placed against the property even though you have paid your contractor in full. You may wish to protect yourself against this consequence by (1) requiring your contractor to furnish a signed release by the person or firm giving you this notice before making payment to your contractor, or (2) any other method or device that is appropriate under the circumstances."* Use an attorney-reviewed template. Getting this language wrong gives the owner grounds to challenge the notice. [California preliminary notice resources](/resources/california) ## Does a California Preliminary Notice Expire? No, a properly served California preliminary notice does not expire. Once served, it remains effective for the duration of the project as long as you continue to furnish labor or materials. You do not need to re-serve a new notice for each phase of work or each billing period on the same project. However, if you leave a project and return later for a distinctly separate and unrelated scope of work, best practice is to serve a new preliminary notice to make sure your lien rights are clearly established for the new work. When in doubt, serve again. The cost is minimal compared to the risk. ## What Happens If You Don't Serve the California Preliminary Notice? If you fail to serve the preliminary notice, you lose your right to file a mechanics lien, enforce a stop payment notice, and make a claim against a payment bond for any work performed outside the protected 20-day lookback window. California courts strictly enforce this requirement — there is no equitable exception, no grace period, and no "substantial compliance" argument that will reliably save you. The California mechanics lien statute at Civil Code § 8410 requires that the claimant have served a preliminary notice in compliance with Article 1 of Chapter 2 of Title 2 of Part 6 of Division 4. If you can't show that, your lien gets dismissed. To put it plainly: a contractor who skips the preliminary notice and then tries to file a lien on a $200,000 job is almost certainly going to walk away with nothing if the owner or GC challenges it. [California lien deadline reference](/deadlines/california) ## Frequently Asked Questions ### Does a general contractor need to serve a California preliminary notice? A general contractor with a direct contract with the property owner does not need to serve a 20-day preliminary notice to preserve mechanics lien rights. However, under [Cal. Civ. Code § 8200](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8200.)(d), a general contractor must still serve a preliminary notice on the construction lender if one is involved on the project. Sub-tier contractors and suppliers always need to serve the notice. ### Can I still file a mechanics lien if I served the preliminary notice late? Yes, but your lien is limited. If you served late, your lien can only cover labor and materials furnished in the 20 days before the date of service, plus work done after service. Everything furnished more than 20 days before you served the notice is unprotected. Late is better than never, but early is always the right answer. ### What is the deadline to actually record a mechanics lien in California after serving the preliminary notice? Serving the preliminary notice does not file the lien — it just preserves your right to do so. After the project is complete or you stop working, you have 90 days from completion of the project (as defined under [Cal. Civ. Code § 8180](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8180.)) to record a mechanics lien with the county recorder. If a Notice of Completion or Notice of Cessation is recorded, subcontractors have only 30 days from recordation to file the lien. ### Does a preliminary notice need to be notarized? No. A California preliminary notice does not need to be notarized. It must be signed by the claimant or their authorized agent, but notarization is not required under [California Civil Code § 8200](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8200.) or § 8202. ### What address should I use for the property owner if I can't find it? Use the address shown on the building permit. If that's not available, check the county assessor's records or the recorded construction trust deed. Under [Cal. Civ. Code § 8202](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8202.), you serve the "owner or reputed owner" — the reputed owner is whoever appears to be the owner based on publicly available information. Document your search process. ### Can I serve the preliminary notice by email? No. [California Civil Code § 8106](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=8106.) does not authorize email as a valid method of service for preliminary notices. Service must be by personal delivery, first-class mail with Certificate of Mailing, or certified/registered mail. Do not rely on email alone, even if the other party acknowledges receipt — it does not satisfy the statutory requirement. ### Does a preliminary notice cover work on multiple phases of a project? Yes, one preliminary notice covers all work on a single project as long as you are continuously furnishing labor or materials. You do not need to re-serve for each phase, change order, or invoice cycle on the same project. If you demobilize and return for a separate, unrelated scope months later, serve a new notice to be safe. ### What is the difference between a California preliminary notice and a mechanics lien? A preliminary notice is a prerequisite document served early in the project that preserves your future right to lien. A mechanics lien is the actual claim recorded against the property title when you haven't been paid. The preliminary notice does not cloud title or create a lien — it simply keeps your option to file one open. You must serve the notice before you can record the lien. ## Protect Your Lien Rights Before the Clock Runs Out Every day you wait after first showing up on a job is a day closer to losing your lien rights. California's 20-day rule is unforgiving — courts don't bend it for honest mistakes or oversights. LienFlash files your California preliminary notice with USPS Certified Mail, attorney-reviewed templates, and a Certificate of Mailing PDF — all in about 2 minutes. At $24.99 per notice, it costs less than an hour of your labor and protects every dollar you've earned on the job. [lien deadline calculator](/tools/lien-deadline-calculator) Don't guess at your deadline. Use our free lien deadline calculator to find out exactly when your notice is due, then file it through LienFlash before you lose the window. --- Source: https://lienflash.app/blog/california-20-day-preliminary-notice Author: Grant Larsen, President, LienFlash Publisher: LienFlash (https://lienflash.app)