California Codes, Civil Code - CIV, Division 4 — General Provisions, Part 6 — Works of Improvement, Title 2 — Private Works of Improvement, Chapter 2 — Preliminary Notice, Section 8204

(a) A preliminary notice shall be given not later than 20 days after the claimant has first furnished work on the work of improvement. If work has been provided by a claimant who did not give a preliminary notice, that claimant shall not be precluded from giving a preliminary notice at any time thereafter. The claimant shall, however, be entitled to record a lien, give a stop payment notice, and assert a claim against a payment bond only for work performed within 20 days prior to the service of the preliminary notice, and at any time thereafter.

(b) A design professional who has furnished services for the design of the work of improvement and who gives a preliminary notice not later than 20 days after the work of improvement has commenced shall be deemed to have complied with Section 8200 with respect to the design services furnished, or to be furnished.