Likely no rent cap applies

Civil Code §827(b)(2). No rent cap does not mean no notice: this applies to every periodic tenancy in California: week to week, month to month, or shorter. The 10% is measured against the rental amount charged at any time in the 12 months before the increase takes effect, so measure from the lowest rent in that period.

Source: California Civil Code §827 (notice of a change in rent) Verified August 9, 2026

Civil Code §827(b)(3)(A). The 12 months are counted back from the effective date of the increase. With no cap in force this tier is genuinely reachable, which is why both are listed here.

Source: California Civil Code §827 (notice of a change in rent) Verified August 9, 2026

Code of Civil Procedure §1013(a) adds five calendar days when the notice is served by mail, where the place of address and the place of mailing are both in California. §827(b) points at §1013 by name.

Source: California Code of Civil Procedure §1013 (service by mail) Verified August 9, 2026

Civil Code §1946.2(e)(8)(B)(i) and §1947.12(d)(5)(B)(i) set out one identical mandatory sentence that has to appear in the rental agreement under §1946.2(e)(8)(B)(iii) and §1947.12(d)(5)(B)(iii) for any tenancy commenced or renewed on or after July 1, 2020 (July 1, 2022 for a mobilehome): "This property is not subject to the rent limits imposed by Section 1947.12 of the Civil Code and is not subject to the just cause requirements of Section 1946.2 of the Civil Code…" This is the paperwork the exemption stands on. Without it, the cap and the just-cause rules apply after all.

Source: California Civil Code §1946.2 (just cause and exemptions) Verified August 9, 2026