How to Fight an Illegal Rent Increase in California

California Tenant Defense System | Justice Foundation

Illegal rent increases are among the most common landlord violations in California — and they are among the easiest to fight with the right knowledge. Whether your landlord has violated AB 1482’s statewide cap, your city’s local rent control ordinance, or the notice requirements for any rent increase, you have specific rights and remedies that most tenants never use.

AB 1482 Rent Increase Limits

Under AB 1482, covered landlords can raise rent no more than 5% plus the local Consumer Price Index for All Urban Consumers (CPI-U) in any 12-month period, with the total increase capped at 10% regardless of CPI. The 12-month period runs from the date of the last rent increase, not the calendar year. A landlord who raises rent by 12% when the CPI is 3% (making the legal maximum 8%) has violated AB 1482 — the tenant owes only the rent with the legal increase applied, and the excess is an illegal charge.

Proper Notice Requirements

California law requires landlords to provide written notice before any rent increase: 30 days advance notice for increases of 10% or less, and 90 days advance notice for any increase that exceeds 10% of the lowest rent charged in the preceding 12 months. Notice must be in writing and properly served — oral notice or a note slipped under the door is not legally sufficient. An increase without proper notice is not enforceable until proper notice is given.

How to Respond to an Illegal Increase

When you receive a rent increase notice that you believe is illegal, your response should be immediate and in writing. Send a certified letter to your landlord identifying the specific legal violation — citing AB 1482 or the applicable local ordinance — and stating that you will continue to pay your current lawful rent. Do not simply pay the increased amount under protest — paying the increased amount can be interpreted as acceptance. Continue paying the legal amount with written documentation of each payment.

Filing a Complaint and Seeking Remedies

Illegal rent increases can be challenged through your city’s rent control board (if applicable), a complaint to the California Department of Consumer Affairs, or a civil lawsuit. Successful tenants can recover the excess rent paid, court costs, and in some circumstances attorney’s fees. The Justice Foundation kit includes demand letter templates for illegal rent increases and complaint filing instructions for California’s major rent control jurisdictions.