Renting · Renting guide · Reviewed September 15, 2026
California rent increases, local rules, and notices
The state cap limits the amount. Local law can lower it, and written notice has its own clock.
The short version
The cap is not a flat 10 percent
For a rental covered by the state cap, the 12-month limit is 5 percent plus the regional cost-of-living change, or 10 percent, whichever is lower. In Los Angeles and Orange counties, the state cap for August 1, 2026, through July 31, 2027, is 8.7 percent. A $2,000 lowest gross rent gives a $2,174 ceiling, assuming no lower local cap. Earlier increases count toward that ceiling.
What changes the answer: Some homes are exempt from the state cap. For covered homes, a stricter local cap still wins; enough notice does not make a higher amount lawful.
The math starts with the lowest gross rent charged during the 12 months before the increase takes effect. In the $2,000 example, an earlier rise to $2,100 leaves only $74 more under that state ceiling, not a fresh 8.7 percent. The same tenant generally cannot receive more than two increase steps in 12 months.
For a month-to-month home, an increase totaling 10 percent or less over the prior 12 months generally needs at least 30 days' written notice. More than 10 percent generally needs 90 days. A lease or local rule can add protection, and mailing affects the notice clock.
The California wrinkle is local. A city or county may have a rent board or a lower cap. It may also require registration, extra notice language, stronger just-cause rules, or more moving help. The exact address matters more than the mailing city on an envelope.
A rent-increase notice is not an eviction judgment. A notice to pay, fix something, or move has its own deadline. A Summons and Complaint mean a court case has been filed. Use California Courts self-help and legal help promptly for court papers; a rent-board inquiry does not pause that deadline.
How it works
Coverage comes before the percentage
The statewide cap covers many rentals, but not every home. Housing with a certificate of occupancy issued within the prior 15 years is one common exemption; that age exemption does not apply to mobilehomes. Some deed-restricted affordable homes and school dorms are also outside the cap. A two-unit home in one building can be exempt if neither unit is an ADU or junior ADU. The owner must have used one unit as their main home since the tenancy began.
Some single-family homes and condos qualify only when both the ownership and written-notice rules are met. A home owned by a corporation, a real estate investment trust, or an LLC with a corporate member does not get this exemption. An exempt home can still be covered by its lease, notice rules, emergency price rules, or stronger local law.
The statewide cap follows the effective date
The cost-of-living part of the formula depends on the region and the effective date. California uses a new yearly measure for increases that take effect on or after August 1. The Attorney General posts a current table by region. A rate remembered from last year can be wrong this year.
For August 1, 2026, through July 31, 2027, the state caps are: Los Angeles and Orange counties, 8.7 percent. Riverside and San Bernardino, 8.1 percent. San Diego, 8.2 percent. Alameda, Contra Costa, Marin, San Francisco, and San Mateo, 8.8 percent. Every other county, 8.6 percent. The state uses April indexes where available. Riverside and San Diego use March because they do not publish an April figure.
For August 1, 2025, through July 31, 2026, the state caps were: Los Angeles and Orange counties, 8 percent. Riverside and San Bernardino, 7.5 percent. San Diego, 8.8 percent. Alameda, Contra Costa, Marin, San Francisco, and San Mateo, 6.3 percent. Every other county, 7.7 percent. Use the increase's effective date, not the date you read the notice.
The law measures the cap against the lowest gross rent charged during the prior 12 months. A concession, incentive, rebate, or credit is left out of that lowest-rent calculation only when the lease lists and identifies it separately. Keep the lease and rent ledger close.
Notice time and allowed amount are separate tests
For a month-to-month home, Civil Code section 827 sets the basic notice clock. An increase of 10 percent or less generally needs at least 30 days' written notice. That test counts other increases during the prior 12 months. An increase over 10 percent generally needs at least 90 days' notice. Service by mail can affect timing.
The 90-day rule has an exception for a legally required review of income or family size, called recertification. If that review causes the increase, the basic notice period is 30 days. A law, regulatory agreement, or contract can require longer notice.
Enough notice does not make an otherwise unlawful amount lawful. A fixed-term lease can also limit an increase during the term unless the agreement permits it. The local ordinance may add another step.
Just cause is a different protection
The statewide just-cause rule generally begins after the stay period in Civil Code section 1946.2 is met. It separates at-fault reasons from no-fault reasons. Unpaid rent and a major lease breach are at-fault examples. An owner move-in, withdrawal from the rental market, a government order, demolition, or major remodel may use the no-fault lane.
When the statewide no-fault rule applies, the notice must address moving help. The owner generally pays one month's rent or waives the final month. Local law can give stronger protection or more help.
A landlord notice is not a court case
A landlord notice warns that a court case may follow if the stated problem is not resolved or the tenant does not move by the deadline. A Summons and Complaint mean the case has already been filed. The response time then depends on how the court papers were served.
Do not wait for the rent board or landlord to pause a court deadline. Use the current California Courts instructions, the local court self-help center, and legal help as soon as court papers arrive.
First moves
- 1
Save the lease, every addendum, the envelope or email, and the full notice. Write down when and how it arrived.
- 2
Confirm the exact address, city limits, county, building type, move-in date, and any owner-occupancy or exemption language in the lease.
- 3
For a rent increase, list the lowest gross rent charged during the prior 12 months, every increase in that period, the new amount, and the effective date.
- 4
Check the official city and county sites for a rent board, housing department, tenant-protection office, or local ordinance.
- 5
Match the paper to the state source: rent cap, rent-change notice, tenancy termination, or eviction court case.
- 6
When a deadline or court paper is involved, use California Courts self-help and legal help promptly while continuing to protect the deadline.
Watch for
- 1
A local rule may be more protective and may use a different annual period, registration system, petition process, or notice form.
- 2
An exemption can depend on building age, ownership, owner occupancy, and exact written language. A verbal statement is not the whole check.
- 3
A 3-day, 30-day, or 60-day landlord notice is not a judgment. It can still start a short path toward a court filing.
- 4
A Summons and Complaint use court deadlines tied to service. Read the current court instructions and get help promptly.
- 5
An emergency declaration can trigger a separate rental price rule. Check current state and local emergency pages when that applies.
Official sources
Official sources
Current forms, fees, deadlines, maps, and local instructions from the agencies responsible for them.
Rent coverage and deadlines can turn on the exact address, local ordinance, building age, ownership, lease language, exemption notice, effective date, occupancy history, and method of service. Use the current local program and California Courts for the paper in hand.