Rent Increase Notice Requirements in California

At a glance

Requirements one by one

Notice period

California measures the notice period by the cumulative increase, not just the last increase in isolation. Under § 827(b)(2), the notice is at least 30 days when the proposed increase, combined with all other increases in the preceding 12 months, is 10% or less. Under § 827(b)(3)(A), the notice is at least 90 days when that cumulative figure is greater than 10%.

For example, if rent was $2,000 and a landlord already raised it to $2,100 in the same 12-month lookback, a proposed increase to $2,220 is tested against the lowest $2,000 rate. The combined 11% increase crosses the 10% notice threshold, so the 90-day period applies even though the newest step alone is less than 10%.

Statewide cap and frequency

For a home covered by § 1947.12(a)(1), the most the gross rent may rise over 12 months is the lower of 5% plus the applicable cost-of-living percentage or 10%, measured from the lowest gross rent charged during that period. Discounts, incentives, concessions, and credits are excluded when identifying that lowest gross rate, and the lease must list them separately from the gross monthly rent.

The same tenant may receive no more than two increase increments during the 12-month period under § 1947.12(a)(2). Two increments are not two separate caps: together they still must stay within the annual maximum.

Exempt homes

The principal exemptions appear in § 1947.12(d)-(e). They include regulated affordable or subsidized housing, school dormitories, housing under stricter local rent control, housing with a certificate of occupancy issued within the previous 15 years, and an owner-occupied duplex that meets the statutory conditions. A separately alienable home such as a qualifying single-family house or condominium can also be exempt, but only when the ownership conditions are met and the tenant receives the exact statutory exemption notice.

Form and service

Section 827(b)(1) requires written notice and gives two service routes for a residential rent increase: personal delivery or mail under Code of Civil Procedure § 1013. For mail sent and addressed within California, § 1013(a) adds five calendar days to the statutory notice period. The rent- increase notice itself must advise the tenant of the increase; a landlord claiming the separately alienable-home exemption must also have supplied the specific exemption statement quoted in § 1947.12(d)(5)(B).

Fixed lease term

The unilateral rent-change procedure in § 827(b) expressly covers a tenancy from week to week, month to month, or another period shorter than a month. It does not state a mechanism for changing the rent during a longer fixed term. Check the fixed lease itself and distinguish a proposed renewal rent from a change before the existing term ends.

Remedies for exceeding the cap

Under § 1947.12(k)-(l), (o), a tenant may seek an injunction and damages equal to the rent demanded or collected above the lawful maximum. The court may award reasonable attorney fees and costs. If the owner acted willfully or with oppression, fraud, or malice, damages may reach three times the excess amount. The statute gives three years to bring that action and makes a waiver of these rights void. The statewide cap is scheduled to remain in effect through December 31, 2029 under § 1947.12(o).

What trips people up

The 10% figure in § 827 is a notice threshold, not permission to raise every tenant's rent by 10%. A covered unit may have a lower cap under § 1947.12, and a city or county may impose a stricter local limit. Conversely, a unit can be exempt from the statewide cap and still be protected by the 30/90-day state notice rule.

The lookback uses the rent charged "at any time" during the preceding 12 months. Splitting one increase into two steps does not reset either test. Section 1947.12 separately limits a covered tenancy to two increments, and § 827 adds the increases together when deciding whether 30 or 90 days is required.

The single-family-home or condominium exemption is not automatic merely because the building type fits. Section 1947.12(d)(5) also tests the owner's legal form and requires the statutory written exemption statement.

Common questions

Does a new tenant inherit the prior tenant's capped rent?

Not under this statewide section. Section 1947.12(b) allows the owner to set the initial rent for a genuinely new tenancy when no tenant from the prior tenancy remains in lawful possession. The cap applies to later increases after that initial rate is set; a local ordinance may impose a different rule.

Does mailing count as giving 30 or 90 days' notice on the mailing date?

Mail service is complete on deposit, but CCP § 1013(a) extends the statutory notice period. When both the mailing and destination are in California, add five calendar days to the 30- or 90-day period.

Is a rent increase above 10% always illegal?

No. Above 10% automatically triggers at least 90 days' notice under § 827, but legality also depends on whether § 1947.12 covers the home. For a covered home, 10% is the outer ceiling and the CPI formula can produce a lower ceiling. For an exempt home, state notice law may allow an increase above 10%, subject to the lease and any stricter local law.

Statutes and sources

• Cal. Civ. Code § 827(b)(1)-(3). Written service methods and the cumulative 30/90-day notice test. Archived official code page (official page captured May 20, 2026; accessed July 12, 2026).
• Cal. Code Civ. Proc. § 1013(a). Mail service and the five-calendar-day in-state extension. Archived official code page (official page captured March 14, 2026; accessed July 12, 2026).
• Cal. Civ. Code § 1947.12(a)-(b), (d)-(e), (k)-(l), (o). The cap formula, increment limit, exemptions, remedies, waiver rule, and 2030 repeal. Archived official code page (official page captured May 10, 2025; accessed July 12, 2026).