--- title: California Preliminary Notice (20-Day Notice) for HVAC Contractors | LienFlash slug: california-preliminary-notice-hvac description: California hvac subcontractors: notice deadline, phased furnishing explained, worked example, and trade-specific FAQs. published: 2026-06-27T16:31:08.438Z updated: 2026-06-27T16:31:08.438Z canonical: https://lienflash.app/blog/california-preliminary-notice-hvac author: Grant Larsen publisher: LienFlash --- # California Preliminary Notice (20-Day Notice) for HVAC Contractors In California's bustling construction scene, HVAC subcontractors face the unique challenge of phased mobilization, especially in large commercial projects. Whether it's the sprawling warehouses in the Inland Empire or the intricate VRF systems in Bay Area tech campuses, the long gaps between phases like duct rough-in and equipment set can be problematic. Projects often start with roof curb setting or duct support framing, followed by weeks of waiting before the rooftop units or VRF outdoor units arrive. This delay can lead to confusion about when to start tracking the preliminary notice clock, a critical step in securing payment rights in California's complex construction landscape. > **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](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=8200.&lawCode=CIV) | | **Deadline** | **20 days from first furnishing of labor, services, or materials** | *The deadline is strictly enforced.* --- ## When Does the Clock Start for HVAC Contractors? In California, the initial steps like roof curb setting, duct support framing, or even underground refrigerant line trenching are considered the first furnishing on commercial HVAC jobs. These activities often occur weeks before the equipment delivery, marking the start of the notice clock. An edge case arises when VRF outdoor units are delivered to a staging area before being craned to the mechanical yard, which can complicate the determination of the first furnishing date. *The exact legal definition of "first furnishing" is set by [Cal. Civ. Code §§ 8102, 8200–8216](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=8200.&lawCode=CIV). This operational description does not substitute for the statutory definition.* --- ## Worked Example: Riverside — VRF multi-zone system installation on a three-story medical office building undergoing seismic retrofit An HVAC subcontractor was hired by the general contractor for a seismic retrofit project in Riverside. On the first day, the crew set roof curbs and installed the structural support framing for the VRF outdoor units, marking the first physical HVAC work on the building. The subcontractor incorrectly assumed that the notice clock would start with the delivery of the VRF outdoor units from the Los Angeles distribution warehouse, not realizing that the initial structural phase was the actual start. They filed the preliminary notice only after the VRF units arrived and refrigerant line sets were begun, weeks after the roof-curb work. | Event | Date | |---|---| | First furnishing | June 9, 2025 | | Notice must be served by | **June 29, 2025** | | Deadline | **20 calendar days** ([Cal. Civ. Code §§ 8102, 8200–8216](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=8200.&lawCode=CIV)) | If the notice is not served by **June 29, 2025**, lien rights are at risk regardless of work completed or amounts unpaid. --- ## Three Ways California HVAC Contractors Lose Their Lien Rights **N. Tracking from Equipment Delivery** In California, many HVAC subcontractors mistakenly start tracking from the delivery of VRF or RTU equipment. However, the clock actually starts with the initial phases like roof curb setting or duct rough-in, which are crucial to secure payment rights. **N. Multi-Phase Builds** California's large warehouse or campus projects often involve separate trade packages for ductwork rough-in and equipment startup. These phases can be weeks apart, but the notice clock starts with the earliest phase, not the later equipment startup. **N. Commissioning and T&B** In California, commissioning and test-and-balance (T&B) are often seen as the final steps in HVAC projects. However, these should not be confused with the start of furnishing, which occurs much earlier in the project timeline. --- ## 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 HVAC Sub Doesn't File In the vibrant city of Fresno, an HVAC subcontractor was tasked with installing a VRF multi-zone system on a seismic-retrofit medical office. The project began with the installation of roof curbs and duct support framing, a typical first step in California's phased construction approach. However, the subcontractor mistakenly tracked the notice clock from the delivery of the VRF units, which occurred weeks after the initial work. This oversight led to a potential loss of payment rights, as the early phases of work were not accounted for in the preliminary notice. The gap between the initial framing and the later equipment delivery exemplifies the unique challenges faced in California's construction industry. --- ## HVAC-Specific Questions **On our California job, the VRF outdoor units were delivered to the GC's staging area before we craned them to the mechanical yard. Did our clock start at delivery or at the crane pick?** In California, the clock typically starts with the first physical work related to the HVAC system. If the VRF units were delivered to a staging area, the clock may not start until they are actually set in place, unless earlier work like roof curb setting has already occurred. **We completed duct rough-in on a Riverside warehouse in spring, then came back eight weeks later for RTU startup and T&B. When did our notice clock start — rough-in or startup?** In California's phased construction, the notice clock starts with the earliest phase of work, such as duct rough-in. The later RTU startup and T&B are separate phases that do not reset the clock. **California has a Title 24 commissioning requirement for most commercial HVAC systems. Does the commissioning agent's sign-off affect when our furnishing clock started?** In California, the Title 24 commissioning sign-off is a final step in the process, but it does not affect the start of the furnishing clock. The clock begins with the initial phases of physical work, well before commissioning. --- ## California Preliminary Notice (20-Day Notice): Standard FAQs As a California HVAC contractor, understanding when your preliminary notice clock starts 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](/deadlines/california). --- ## File the Moment You Mobilize LienFlash automates California Preliminary Notice (20-Day Notice) filing for hvac subcontractors. [Start your first notice →](/signup) --- *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.* --- Source: https://lienflash.app/blog/california-preliminary-notice-hvac Author: Grant Larsen, President, LienFlash Publisher: LienFlash (https://lienflash.app)