California 20-day preliminary notice deadline calculator
Enter the date you first furnished labor, services, equipment, or materials to the job. We'll show your statutory deadline, how many days remain, and exactly what lien rights are at risk, based on California Civil Code §8204.
Pick your first-furnished date to see your deadline, days remaining, and what is at risk.
Not legal advice. This calculator provides general scheduling information based on California Civil Code §8204 and is a self-service aid, not a substitute for an attorney, and no attorney-client relationship is created. Deadlines can shift based on facts the calculator can't see (notices of completion or cessation, holidays, public-entity rules). Verify critical dates with qualified counsel.
How the California 20-day preliminary notice deadline works
In California, most subcontractors, material suppliers, and equipment lessors must serve a preliminary notice (often called the “20-day notice”) to preserve their mechanics lien, stop-payment-notice, and payment-bond rights. Civil Code §8204 sets the clock: the notice must be served no later than 20 days after you first furnish labor, service, equipment, or materials to the work of improvement.
Serve on time, and your rights relate back to day one
When the notice is served within the 20-day window, it protects all the work you've done on the project, including work performed before the notice went out. This “relation-back” is the entire reason to move quickly.
Serve late, and you only protect a 20-day look-back
A late notice is still valid going forward, you're never barred from sending one, but you can only assert lien and bond rights for work furnished in the 20 days before the date you serve it, plus everything after. Any earlier work falls outside your protection. That's the “partial loss” this calculator warns you about.
Direct (prime) contractors
A direct contractor who contracts with the owner generally does not need a preliminary notice to keep mechanics lien rights, but must serve the notice on the construction lender if the project has one.
How to serve it
Preliminary notice is typically served by first-class certified or registered mail (or personal delivery) on the owner, the direct contractor, and the construction lender, as applicable. The date of service is what counts against your deadline, which is why getting it in the mail today matters. Prepare and send your preliminary notice by certified mail in a few minutes.
Frequently asked questions
- What is the California 20-day preliminary notice deadline?
- Under California Civil Code section 8204, a preliminary notice must be served no later than 20 days after you first furnish labor, service, equipment, or materials to a project. Served on time, it protects all of your work from the first day. Served late, it only protects work furnished in the 20 days before service and anything after.
- What happens if I serve my preliminary notice late in California?
- A late preliminary notice is still valid going forward, but you forfeit lien, stop-payment-notice, and payment-bond rights for any work performed more than 20 days before the date you serve it. Earlier work is no longer protected, so serving as soon as possible preserves the most.
- Do direct (prime) contractors need to serve a preliminary notice in California?
- A direct contractor who contracts with the owner generally does not need a preliminary notice to preserve mechanics lien rights, but must serve a preliminary notice on the construction lender if one exists on the project.
- How is the 20-day deadline counted?
- The clock starts the day you first furnish labor or materials to the work of improvement and runs 20 calendar days, not business days. If day 20 lands on a weekend or holiday, serve earlier to be safe. The date the notice is served, not mailed for delivery later, is what counts against the deadline.
Built by Prelien · California contractor records & preliminary notice tools · Sources: Cal. Civ. Code §§8200–8216.