In California, a landlord can raise rent no more than twice in a 12-month period for most residential tenants covered by the Tenant Protection Act (AB 1482)

. The total amount of rent increase over any 12-month period is capped at 5% plus the local Consumer Price Index (CPI) or 10% total , whichever is lower

. For example, if the local CPI increase is 3.8%, the maximum allowable rent increase would be 8.8% (5% + 3.8%), since that is less than 10%

. Landlords must also provide proper written notice before increasing rent:

• At least 30 days' notice if the increase is 10% or less
• At least 60 or 90 days' notice if the increase is more than 10%, depending on circumstances

Local rent control ordinances may impose stricter limits on frequency and amount of rent increases, so tenants should check city or county rules as well

Summary:

• Rent can be increased up to twice per 12 months
• Total increase capped at 5% + CPI or 10%, whichever is lower
• Proper written notice required (30 days for ≤10%, 60/90 days for >10%)
• Local laws may further restrict increases

This framework applies to most rental units built before February 1, 1995, excluding newer buildings, owner-occupied duplexes, and some other exempt properties