Illegal Rent Increases in California: How to Identify and Fight Them

California Tenant Defense System | Justice Foundation

California’s rent control laws limit how much and how often landlords can raise rent — but landlords still attempt illegal increases regularly, often banking on tenants not knowing the rules. Identifying an illegal rent increase and fighting it effectively requires knowing the applicable law, the proper procedure for contesting the increase, and the remedies available when the increase is unlawful.

What Makes a Rent Increase Illegal

A rent increase is illegal in California when it: exceeds the AB 1482 cap (5% plus local CPI, maximum 10%) for covered units, exceeds a local rent control ordinance’s cap for locally covered units, is given with inadequate notice (30 days required for increases under 10%, 90 days for increases of 10% or more), occurs during a lease term where rent is fixed by the lease, is given in retaliation for protected tenant activity, or is given to a tenant in a covered unit without providing the required notice of AB 1482’s applicability.

How to Contest an Illegal Increase

Step 1: Calculate whether the increase is within the allowable cap. For AB 1482 units, find the local CPI for your area (available on the Bureau of Labor Statistics website) and add 5%. If the proposed increase exceeds this number, it’s illegal on its face. Step 2: Send a written notice to your landlord stating that the increase exceeds the applicable cap, citing the specific law (AB 1482 or local ordinance), and refusing to pay the increase. Step 3: Continue paying the previous (legal) rent amount. An illegal rent increase does not become valid simply because you pay it or don’t contest it promptly — but paying it without protest may be argued as acceptance, so document your refusal in writing.

Formal Remedies

In cities with local rent boards (San Francisco, Oakland, Los Angeles, Berkeley), file a formal complaint with the rent board to contest the illegal increase. The rent board has authority to order the landlord to reduce rent to the legal level and may assess penalties. In jurisdictions without a rent board, your remedies are through the courts — a lawsuit for return of overpaid rent and damages. The Justice Foundation kit includes rent increase calculation worksheets, protest letter templates, and rent board complaint forms for all major California jurisdictions.