California Preliminary Notice (20-Day Notice) for Concrete & Flooring Contractors
In California, the dual-phase trap for concrete and flooring subcontractors is a common pitfall. Picture a subcontractor pouring the structural slab for a massive warehouse in the Inland Empire, only to return months later for the finish flooring — whether it's polished concrete, epoxy grind-and-seal, or tile. California's unique project landscape, from the sprawling logistics hubs in Riverside and San Bernardino to Bay Area tenant improvements, demands attention to the state's strict MVER moisture-testing requirements. These requirements create a critical gap between the concrete and flooring phases, with materials like rebar, wire mesh, vapor barriers, and self-levelers playing key roles in both stages.
A late Preliminary Notice restricts your lien rights — it doesn't eliminate them, but it limits your claim. Under California law, a late notice restricts coverage to work performed in the 20 days before the notice was served, plus future work. File on day one to protect everything.
The Deadline
| Notice type | Preliminary Notice (20-Day Notice) |
| Governing statute | Cal. Civ. Code §§ 8102, 8200–8216 |
| Deadline | 20 days from first furnishing of labor, services, or materials |
The deadline is strictly enforced.
When Does the Clock Start for Concrete & Flooring Contractors?
In California, the clock for preliminary notices starts ticking with the first furnishing of labor or materials, including forming, rebar delivery, and underslab vapor-barrier installation. These activities count even before the concrete is poured. The MVER moisture-testing gap between concrete curing and finish flooring installation is a documented interval in California, but it does not reset the notice clock.
The exact legal definition of "first furnishing" is set by Cal. Civ. Code §§ 8102, 8200–8216. This operational description does not substitute for the statutory definition.
Worked Example: Fontana — structural slab pour and later epoxy grind-and-seal on a 120,000 sq ft Inland Empire distribution center
A concrete and flooring subcontractor was hired by the GC for a Fontana distribution center project. On the first day, the crew delivered rebar and wire mesh to the site and began forming the perimeter of the first slab section — marking the start of concrete work on the project. However, the subcontractor's project tracking system didn't create a notice file until the epoxy grind-and-seal scope began months later, after MVER moisture testing cleared the slab. By then, the early slab scope — the rebar, forming, and pour — had been completed for several months without a Preliminary Notice on file.
| Event | Date |
|---|---|
| First furnishing | April 7, 2025 |
| Notice must be served by | April 27, 2025 |
| Deadline | 20 calendar days (Cal. Civ. Code §§ 8102, 8200–8216) |
If the notice is not served by April 27, 2025, lien rights are at risk regardless of work completed or amounts unpaid.
Three Ways California Concrete & Flooring Contractors Lose Their Lien Rights
1. The Dual-Phase Inland Empire Warehouse Trap
In California's Inland Empire, massive warehouse projects often involve early structural slab work followed by a polished or epoxy finish months later. Subcontractors who track from the finish phase can find themselves unprotected, as the notice clock starts with the initial slab work.
2. California MVER Moisture-Testing Gap
California's stringent MVER moisture-testing requirements create a natural-feeling break between concrete and flooring phases. This gap can mislead subcontractors into thinking the flooring phase is a new job with a new clock, but the notice timeline remains tied to the earliest phase.
3. Pre-Pour Site Work on California Warehouse Projects
Activities like rebar caging, forming, and vapor-barrier installation on California warehouse projects constitute furnishing before a single cubic yard is poured. These early actions start the preliminary notice clock, emphasizing the need for early tracking.
Who Must File?
All claimants except direct contractors. This includes subcontractors, material suppliers, equipment lessors, and laborers (if employed by anyone other than the direct contractor).
Who Is Exempt?
Direct contractors and laborers employed directly by the owner.
How to Serve the Notice
The Preliminary Notice must be served by certified or registered mail, or by any other means of delivery that provides written verification of delivery, to the owner, direct contractor, and construction lender (if any).
Statutory Notice Text
The following notice text must appear verbatim.
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 each payment to your contractor, or (2) any other method or device that is appropriate under the circumstances.
What Happens When a California Concrete & Flooring Sub Doesn't File
In Fontana, a subcontractor takes on a dual-phase project typical of California's Inland Empire: first, pouring the structural slab for a new distribution center, then returning for polished concrete months later. The early phase involves rebar placement, forming, pouring, and curing the slab, followed by the installation of a moisture barrier. After the slab cures, California's MVER testing requirements enforce a pause before the finish flooring phase can begin. When the subcontractor returns for the polished concrete, they realize they tracked from the finish phase, leaving the early slab work unprotected. The gap between phases, though documented, didn't reset the notice clock.
Concrete & Flooring-Specific Questions
We poured the slab on a Fontana warehouse job in April and came back in September for the epoxy finish after the GC's MVER test cleared. Did our clock start in April at the slab work?
Yes, in California, the preliminary notice clock starts with the initial slab work, including forming and rebar placement. The MVER testing gap does not reset the clock, so it's crucial to track from the earliest phase.
On a California TI project, we delivered self-leveler and began moisture-barrier installation before the topping slab was poured. Did those deliveries start our preliminary notice clock?
Yes, in California, delivering materials like self-leveler and installing moisture barriers before the slab pour constitutes the start of furnishing. This begins the preliminary notice clock, even before the concrete pour.
We only do polished concrete and epoxy finishes — no structural slab work. On a California job, when does our furnishing clock start?
For finish-flooring-only contractors in California, the furnishing clock starts with the first on-site activity related to your scope, such as delivering materials or beginning surface preparation. It's important to track from your first involvement, even if it's after the structural slab work.
California Preliminary Notice (20-Day Notice): Standard FAQs
As a California concrete and flooring contractor, understanding the dual-phase notice trap is crucial.
What happens if I send my California Preliminary Notice late?
Unlike some states, sending it late does not completely destroy your lien rights. However, it restricts your lien claim to only the labor or materials provided within the 20 days immediately preceding the date the late notice was served, plus any future work.
This is general information based on California statutes, not legal advice.
Do direct contractors (General Contractors) need to file this?
Direct contractors do not need to serve a Preliminary Notice on the owner or subcontractors, but they MUST serve it on the construction lender if there is one.
This is general information based on California statutes, not legal advice.
See the Full State Deadline Guide
For a complete breakdown of all filing requirements, project-type rules, and deadlines, see the California Preliminary Notice guide.
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This page provides general information about California's construction lien law and is not legal advice. Consult a licensed California construction attorney for guidance on your specific situation.