California Rent Increase Limits in 2027: What Renters, Landlords and ADU Owners Should Check

What is already official for 2027

California's Attorney General has published Tenant Protection Act maximums for covered increases taking effect August 1, 2026 through July 31, 2027: 8.7% in Los Angeles and Orange counties; 8.1% in Riverside and San Bernardino counties; 8.2% in San Diego County; 8.8% in Alameda, Contra Costa, Marin, San Francisco and San Mateo counties; and 8.6% in all other counties.

Those figures are statewide TPA maximums for covered housing, not a promise that every rental may be increased by that amount. Local rent stabilization can be lower, and exemptions/coverage must be checked.

ADU owners should not assume an automatic exemption

Whether an ADU is covered by statewide or local tenant protections depends on the facts, ownership structure, property configuration, required notices and local law. The label 'ADU' alone does not settle the question.

2027 forward-looking notice: This article reflects enacted law and official guidance available on September 22, 2026. Effective dates, agency guidance, annual figures, local rules and implementation details can change before or during 2027. Recheck the linked official sources before acting.

Check the effective date before calculating

The Attorney General's published regional figures above apply to increases taking effect through July 31, 2027. A later 2027 increase may fall into a newly published annual period and should be rechecked before notice is served.