Is a 10% rent increase legal in California?
In California a 10% increase is generally within the legal range (the cap is 10%), as long as you get 30 days' written notice.
Step-by-step answer
- Step 1
How the math checks out
Divide the new rent by the old rent and subtract 1. If the number is 0.10 that's 10%. Compare that to the 10% state cap for covered units.
- Step 2
What to do next
Even a legal increase can be negotiated. Ask about a longer lease, request a smaller increase in exchange for renewing early, and document what similar units in your area rent for.
In California a 10% increase is generally within the legal range (the cap is 10%), as long as you get 30 days' written notice.
The numbers that decide it
- Statewide formula
- 5% + regional CPI
- Cal. Civ. Code §1947.12
- Hard ceiling
- 10%
- The total can never exceed 10% in any 12-month period for covered units
- Typical 2026 cap in most metros
- ≈8–10%
- Depends on your regional CPI figure — check yours before relying on it
- Notice
- 30 or 90 days
- 90 days when the 12-month increase is more than 10%
Figures change — verify against the official source before relying on them.
Why 10% is the exact line in California
AB 1482 caps covered increases at 5% plus regional CPI with a 10% absolute maximum, so 10% is the ceiling rather than a safe default. An increase at or just under 10% is often lawful on a covered unit only if the CPI math supports it; above 10% on a covered unit appears to exceed the statute. Separately, §827(b) generally requires 90 days' notice once a 12-month increase passes 10%, so a 10%-plus notice delivered with 30 days is worth questioning on timing alone.
Worked example
Worked example: $2,000 rent in Los Angeles
- Start with the current rent: $2,000 per month.
- Check coverage. AB 1482 generally covers units at least 15 years old; many new builds, some single-family homes, and owner-occupied duplexes are exempt, and your notice should state which applies.
- Look up your regional CPI figure. If it is 3.5%, the cap is 5% + 3.5% = 8.5%.
- Apply it: $2,000 × 0.085 = $170, so the highest covered rent would be about $2,170.
- Compare the ceiling: 10% of $2,000 is $200, so even a high CPI year would stop around $2,200.
- If the notice says $2,400, that is 20%. On a covered unit that appears to exceed the statutory cap, and because the increase is over 10% it would also generally require 90 days' notice rather than 30.
- If your city has its own stabilization ordinance (Los Angeles, Santa Monica, Oakland, San Francisco, Berkeley), the local cap is often lower and controls instead.
Two numbers decide most California cases: your regional CPI and whether the unit is covered at all. Get both before responding in writing.
Where these rules come from
- Cal. Civ. Code §1947.12 (AB 1482)
The statewide cap: 5% plus regional CPI, never more than 10% total, for most covered units at least 15 years old.
- Cal. Civ. Code §827(b)
Notice rules on month-to-month tenancies: generally 30 days, or 90 days when the increase over 12 months is more than 10%.
- California CPI figures used for the cap
The regional CPI series landlords must use when calculating the 5% + CPI figure for your area.
Check your specific situation
Where do you rent?
Free legal help in California
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State listings sourced from the federal Legal Services Corporation (LSC) grantee directory. Educational information, not legal advice or endorsement.
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