20-Day Preliminary Notice: A Subcontractor's Guide
Last updated: July 2025
Subcontractors, material suppliers, and equipment lessors in California, Arizona, Nevada, and several other states must serve a 20-day preliminary notice within 20 days of first furnishing labor or materials to a project in order to preserve mechanics lien rights. In California, this requirement is codified at Cal. Civ. Code § 8200; Arizona imposes a parallel obligation under A.R.S. § 33-992.01. The notice must be served on the property owner, general contractor, and construction lender (if any). Serving late does not eliminate lien rights entirely — protection is limited to labor and materials furnished in the 20 days before service. Failing to serve the notice at all is a complete bar to mechanics lien rights on private works in states where it is required.
What Is a 20-Day Preliminary Notice and Why Does It Matter?
A 20-day preliminary notice is a formal written document that alerts the property owner, general contractor, and construction lender that a subcontractor or supplier is furnishing labor or materials to a project and intends to preserve the right to file a mechanics lien if not paid. It is not a lien — it is the prerequisite that keeps the lien option open.
In states that require it, skipping this notice means you have no lien rights, period. You can still sue for breach of contract, but a mechanics lien is the most powerful collection tool a subcontractor has — it attaches to the property itself and can force a sale to satisfy the debt. Without a valid preliminary notice on file, that tool is gone.
According to Rabbet's 2024 Construction Payments Report, 82% of contractors face payment waits of over 30 days, up from 49% just two years earlier. The preliminary notice is the single most cost-effective step you can take to ensure you have legal leverage when those delayed payments turn into no payments.
Which States Require a 20-Day Preliminary Notice?
California, Arizona, and Nevada all use a 20-day preliminary notice framework with similar mechanics. Washington, Oregon, and Florida have their own preliminary notice requirements under different names and timelines.
Here is a state-by-state breakdown for the states LienFlash covers:
California — Cal. Civ. Code § 8200 requires a 20-day preliminary notice for all subcontractors and suppliers not in direct contract with the owner on private works. Direct contractors (those with a contract with the owner) must serve a preliminary notice only on the construction lender, if one exists.
Arizona — A.R.S. § 33-992.01 requires a 20-day preliminary notice for all persons not in direct contract with the owner. The notice must be served within 20 days of first furnishing labor, materials, or equipment.
Nevada — NRS § 108.245 requires a "Notice of Right to Lien" served within 31 days of first furnishing on most private projects. The window is slightly longer than California and Arizona but the concept and consequence are identical.
Washington — RCW § 60.04.031 requires subcontractors to serve a "Notice to Customer" or "Notice of Right to Claim Lien" within 10 days of first furnishing on certain project types. Washington's window is significantly shorter than the 20-day standard — this catches a lot of contractors off guard.
Oregon — ORS § 87.021 requires a "Notice of Right to a Lien" served within 8 days of first furnishing on private commercial projects and within 8 days for residential projects where the contractor is not in direct contract with the owner. Oregon's 8-day window is the tightest in the country among LienFlash's covered states.
Florida — Florida does not use a 20-day preliminary notice framework. Under Fla. Stat. § 713.06, subcontractors must serve a "Notice to Owner" no later than 45 days after first furnishing labor or materials. See Florida lien resources for Florida-specific requirements.
Texas — Texas uses a monthly notice system under Tex. Prop. Code § 53.056. Second-tier subcontractors must send notice by the 15th day of the second month following the month in which labor or materials were furnished.
New Mexico — NMSA § 48-2-2.1 requires a preliminary notice within 60 days of first furnishing on private projects. New Mexico's window is the most forgiving among LienFlash's covered states, but missing it still eliminates lien rights.
When Does the 20-Day Clock Start?
The clock starts on the date you first furnish labor or materials to the specific project — not the date your contract is signed, not the date of the first invoice, and not when you mobilize to the site.
In California, "first furnishing" means the first day you physically deliver materials or perform labor at the job site. Under Cal. Civ. Code § 8200, if you serve the notice late, your lien rights are preserved only for labor and materials furnished in the 20 days preceding the date of service. So if you start work on June 1 and don't serve until July 1, the first 10 days of work (June 1–10) fall outside your lien protection window.
Practical rule: serve the notice before you mobilize or on the same day as your first delivery. Most experienced subcontractors serve it before they even step foot on site. That way there is no math to do and no exposure.
Who Must Receive the 20-Day Preliminary Notice?
In California under Cal. Civ. Code § 8200, the notice must be served on three parties:
- The property owner (or reputed owner) — the person or entity that holds title to the property
- The general contractor (or reputed general contractor) — the prime contractor on the job
- The construction lender (if any) — the bank or financial institution funding the construction
If you do not know who the construction lender is, you are required to make a reasonable effort to identify them. Serving only the owner and GC when there is a lender is a defective notice in California.
Arizona follows essentially the same three-party service requirement under A.R.S. § 33-992.01. Nevada requires service on the owner and the general contractor; lender service requirements vary by project type under NRS § 108.245.
Where to find this information: The county recorder's office has the deed (owner info). The building permit lists the general contractor. A Preliminary Title Report or the building permit may identify the construction lender. Some states allow you to request this information directly from the GC — in California, Cal. Civ. Code § 8208 gives you the right to demand project owner and lender information from the direct contractor.
How Must the Notice Be Served?
Service method matters as much as timing. An improperly served notice is a defective notice, which is the same as no notice.
California (Cal. Civ. Code § 8106) permits three valid service methods:
- Certified mail, return receipt requested
- First-class mail with a certificate of mailing (not just a postage stamp — an actual USPS certificate)
- Personal delivery
Arizona (A.R.S. § 33-992.01) requires certified mail, registered mail, or personal service.
Nevada (NRS § 108.245) requires certified or registered mail, or personal delivery.
Certified mail is the safest method in every state. It generates a tracking number, a postmark, and a delivery confirmation — all of which become evidence if you ever need to enforce your lien in court. First-class mail with a certificate of mailing is acceptable in California but provides weaker proof of delivery.
USPS Certified Mail costs $4.85 as the base service fee in 2026, plus standard First-Class Mail postage, per the USPS Notice 123 Price List. Adding electronic Return Receipt adds $2.46; a physical green card adds $4.10. For a legal document that preserves your right to collect thousands of dollars, the total cost under $15 per recipient is not a serious consideration.
What Information Must the Notice Include?
A defective notice — one that is missing required content — is treated the same as no notice in most states. Here is what California's Cal. Civ. Code § 8102 requires:
- A general description of the labor, services, equipment, or materials furnished or to be furnished
- The name and address of the claimant (that's you)
- The name of the person who hired the claimant (the party you contracted with — could be the GC or an upper-tier sub)
- The address of the jobsite or description of the property sufficient to identify it
Arizona adds a requirement that the notice include the claimant's contractor license number. Nevada requires a description of the property by legal description or assessor's parcel number in addition to the street address.
Attorney-reviewed templates eliminate the guesswork here. A state-specific form that has been reviewed against current statute language ensures you are not missing a required field.
What Happens If You Miss the 20-Day Deadline?
Missing the deadline has two possible outcomes depending on how late you are.
Partial protection (served late, but served): In California, if you serve after the 20-day window, you preserve lien rights only for labor and materials furnished in the 20 days before service. Everything before that window is unprotected. If the unpaid amount falls entirely within that protected window, your lien rights are intact. If unpaid work stretches further back, you will have a gap.
No protection (never served): If you never serve the notice, you have no mechanics lien rights on the project for private works in California, Arizona, and Nevada. You can still pursue a breach of contract claim in civil court, but you lose the leverage that a lien provides — the ability to cloud title and force payment before the property can be sold or refinanced.
The financial stakes make this straightforward. According to Rabbet's 2024 Construction Payments Report, slow payments cost the U.S. construction industry an estimated $280 billion in 2024, adding roughly 14% to total construction spending. A preliminary notice filed on day one costs under $25 and preserves your legal right to collect every dollar owed to you on that job.
California preliminary notice resources
Does a Preliminary Notice Guarantee Payment?
No. A preliminary notice does not guarantee you get paid — it guarantees you have legal options if you do not get paid.
The notice preserves your right to file a mechanics lien. The lien, once recorded, attaches to the property and puts every buyer, lender, and title insurer on notice that there is an unpaid claim. That creates real pressure to resolve the payment dispute. Most payment disputes that reach the lien stage get resolved without going to court because no one wants a clouded title.
The notice also signals professionalism. Subcontractors who serve preliminary notices consistently are harder to stiff. GCs and owners know you are tracking your rights.
In 2024, preliminary notices were filed on construction projects valued at over $22.7 billion in the United States, according to Lienser via DocJoist Construction Payment Statistics 2026. That volume exists because experienced contractors in every trade understand the math: a $24.99 notice that preserves rights on a $15,000 subcontract represents an enormous return on a two-minute investment.
Frequently Asked Questions
Do I need to file a 20-day preliminary notice on every project?
Yes, in states that require it — California, Arizona, and Nevada among them — you must serve the notice on every private works project where you are not in direct contract with the property owner. There are limited exceptions (California excludes certain owner-occupied residential projects of four units or fewer when specific conditions apply), but the default rule is: send it on every job.
Does a 20-day preliminary notice expire?
No. Once properly served, a preliminary notice does not expire on its own. It preserves your lien rights for the duration of the project. However, your mechanics lien itself must be recorded within a specific window after project completion or your last furnishing — 90 days in California under Cal. Civ. Code § 8412, for example. The preliminary notice is the foundation; the lien recording deadline is the next clock you need to track.
Can I serve the notice before I start work?
Yes, and in most cases you should. Serving a valid 20-day preliminary notice before you first furnish labor or materials is acceptable in California, Arizona, and Nevada. It fully protects all work performed after service. Serving early eliminates the deadline math and ensures full coverage from day one.
Does a 20-day preliminary notice apply to public works projects?
No. Mechanics lien rights do not attach to public property. On public works projects, the equivalent protection mechanism is a bond claim — specifically a claim against the contractor's payment bond, which is required on most public projects under the Miller Act (federal) or state equivalents like California's Public Contract Code § 9550. Preliminary notice requirements on public projects are governed by separate statutes.
What if the GC refuses to give me the owner's information?
In California, Cal. Civ. Code § 8208 requires the direct contractor to provide the owner's name and address upon written request from a claimant. A refusal does not eliminate your obligation to serve the owner, but courts have held that good-faith efforts to obtain the information and serving the known parties counts in your favor. Document every attempt to obtain the information in writing.
Is a 20-day preliminary notice the same as a Notice to Owner in Florida?
No. Florida does not use the 20-day preliminary notice framework. Florida's equivalent is the "Notice to Owner" under Fla. Stat. § 713.06, which must be served within 45 days of first furnishing — a longer window, but a different document with different content requirements and service rules. Do not use a California or Arizona preliminary notice form in Florida.
What if I am a sub-subcontractor — does the notice still apply to me?
Yes. In California, Arizona, and Nevada, sub-subcontractors and second-tier suppliers must serve the 20-day preliminary notice to preserve lien rights. The notice travels up the chain: you serve the owner, the GC, and the construction lender. Your direct contract is with a subcontractor, but your lien notice obligations run to the top of the chain.
How do I prove I served the notice if there is a dispute?
Proof of service is critical. USPS Certified Mail generates a mailing receipt (the postmark), a tracking record, and a delivery confirmation. Keep all of these. If you use a service like LienFlash, you receive a Certificate of Mailing PDF that documents the notice content, recipient addresses, and USPS tracking — everything you need to prove compliance in a lien enforcement action.
Protect Your Lien Rights Today
Serving a preliminary notice is a two-minute task that preserves your right to collect on every dollar of work you perform. Missing it means starting a job with no legal backstop if the payment stops. LienFlash generates attorney-reviewed, state-compliant preliminary notices and sends them via USPS Certified Mail — with a Certificate of Mailing PDF delivered to your inbox. One notice costs $24.99. If you are running multiple jobs, the Pro plan covers three notices a month for $49.
Calculate your exact filing deadline based on your first-furnishing date at lien deadline calculator, or create your account and file your first notice in under two minutes at create a LienFlash account.