California Rent Increases and Notice Periods

The short answer

For a periodic residential tenancy, Civil Code section 827 generally requires at least 30 days’ written notice when the proposed increase—alone or combined with other increases for that tenant during the preceding 12 months—is 10% or less. If the combined increase is greater than 10%, the statute generally requires at least 90 days’ written notice. Mailing invokes the extensions in Code of Civil Procedure section 1013.

That is only the notice-period layer. A covered unit may also be subject to the statewide cap in Civil Code section 1947.12, a lower local cap, a fixed-term lease, a subsidized-housing contract, an emergency price restriction, or a retaliation rule. A longer notice does not make an otherwise excessive increase lawful.

What to do first

Before preparing a notice:

1. Verify the property’s jurisdiction. Confirm the actual city or unincorporated county, not only the postal address.
2. Determine coverage. Analyze the statewide cap and every potentially applicable local program separately.
3. Read the lease and regulatory documents. Confirm whether the tenancy is periodic or fixed term and whether a subsidy contract, regulatory agreement, or lease provision requires more.
4. Build a 12-month rent history. Include the lowest gross rent, every increase, and every discount, concession, incentive, credit, or change in housing services.
5. Select the effective date. The effective date determines the applicable statewide CPI period and may determine the local rate.
6. Calculate the maximum lawful rent. Use the lowest applicable ceiling, not the highest figure found.
7. Choose the service method and count conservatively. Preserve a copy of the signed notice and reliable proof of personal delivery or mailing.
8. Check emergencies immediately before service. A declaration can create a separate, time-limited restriction.

What not to do

• Do not assume every unit may receive the statewide maximum.
• Do not use last year’s CPI figure because the notice looks similar.
• Do not apply a percentage to the current rent without checking the statutory lookback base.
• Do not treat two permitted increments as two full annual allowances.
• Do not use a 30-day notice merely because each individual increase is under 10%; section 827 looks at the combined increases during the preceding 12 months.
• Do not mail a notice and count the same minimum period used for personal delivery.
• Do not impose an increase during a fixed term unless the agreement and governing law permit it.
• Do not reduce a required housing service or add a new charge without testing whether it functions as rent under the governing state or local rule.
• Do not use an increase to pressure a resident for making a protected complaint or exercising a legal right.

Facts and documents that matter

A useful review file should contain:

• The complete lease, all renewals, addenda, and term-change notices.
• The tenant ledger for at least the previous 18 months.
• A schedule of gross rent, concessions, credits, parking, utilities, storage, and other recurring charges.
• Every rent-increase notice and proof of service from the preceding 12 months.
• The certificate-of-occupancy date and any later certificate associated with the unit.
• Current title and entity-ownership information.
• The AB 1482 exemption notice, if an exemption is claimed.
• The property’s city, county, unit count, and local registration status.
• Any Housing Assistance Payments contract, regulatory agreement, affordability covenant, agency approval, or program notice.
• Recent repair complaints, inspection activity, accommodation requests, resident-organizing activity, or other facts relevant to retaliation or fair housing.
• The proposed effective date, service date, delivery method, amount, and business reason.

Governing statewide framework

Step 1: Decide whether the statewide cap applies

For covered residential property, section 1947.12 limits the increase over a 12-month period to 5% plus the applicable cost-of-living change or 10%, whichever is lower, measured from the lowest gross rental rate charged during the 12 months before the increase takes effect.

When the same tenant remains, no more than two increase increments may be imposed during a 12-month period. A new tenancy with no tenant from the prior tenancy remaining in lawful possession generally permits a new initial rent under state law, but local and emergency rules still require review.

The current version of section 1947.12 became operative April 1, 2024 and is scheduled for repeal January 1, 2030 unless the Legislature acts again.

Coverage and exemptions are addressed in California Tenant Protection Act and AB 1482 and AB 1482 Exemptions and Property Coverage.

Step 2: Use the rate for the effective date

Section 1947.12’s CPI method changes on August 1. According to the California Attorney General’s official informational table, the current published statewide ceilings are:

Other metropolitan areas have different published figures. These numbers must be checked on the publication date and again before use. The Attorney General’s table is guidance; the formula and definitions in section 1947.12 control.

Step 3: Identify the calculation base

For a covered unit, use the lowest gross rental rate charged at any time during the 12 months before the increase’s effective date. Review concessions rather than relying only on the ledger’s most recent monthly charge. Section 1947.12 requires the gross monthly rate and owner-offered discounts, incentives, concessions, or credits to be separately identified in the lease or amendment.

Step 4: Determine the notice period

For the periodic residential tenancies addressed by section 827:

• 30 days or more: The proposed increase, alone or combined with all other increases for that tenant during the 12 months before the effective date, is 10% or less of the rental amount charged to that tenant at any time during that period.
• 90 days or more: The proposed increase, alone or combined with those earlier increases, is greater than 10%.

A qualifying income or family-composition recertification required by statute or regulation receives the treatment specified in section 827(b)(3)(B).

Section 827 does not create a right to rewrite an unexpired fixed-term lease. The lease, any increase clause, renewal status, subsidy documents, and other law control whether and when a fixed-term rent can change.

Step 5: Account for service

Section 827 permits personal delivery or service by mail under section 1013. When both the place of mailing and the destination are within California, section 1013 generally extends the statutory period by five calendar days. It specifies different extensions for other destinations.

The file should establish:

• The date and place of personal delivery or deposit in the mail.
• The address used.
• The effective date.
• The full minimum notice period after applying the correct extension.

Ordinary email, text message, or a resident portal should not be treated as a substitute for a statutorily authorized service method without a property-specific legal basis.

Step 6: Check retaliation and other statewide restrictions

Civil Code section 1942.5 restricts retaliatory rent increases and other conduct after specified tenant activity. A documented lawful business reason helps, but it does not excuse an increase prohibited by another law.

Penal Code section 396 can impose temporary restrictions following a qualifying emergency declaration. The covered geography, start date, extensions, housing formula, and exceptions require same-day review through Cal OES emergency proclamations and the declaration itself.

Local overlay check

A statewide calculation is not complete until local law is checked. A local program may:

• Set a lower annual percentage.
• Permit only one increase in a 12-month period.
• Use its own base rent, CPI series, or annual adjustment date.
• Require registration and payment of fees before an increase may take effect.
• Require prescribed notice text, a local form, translation, or city filing.
• Treat removed services or added charges as a rent increase.
• Provide a petition process for capital improvements or a fair return.

For example, the Attorney General’s July 2026 table identifies a Santa Ana maximum of 2.87% for the period September 1, 2026 through August 31, 2027 for units covered by that local regime. The City’s current ordinance also contains registration, notice-content, translation, and registry-submission requirements. This example is not a complete Santa Ana coverage analysis and must be rechecked against the City’s current law and program materials.

The Attorney General expressly describes its local chart as informational and not exhaustive. Verify the municipal or county code, uncodified ordinances, and current agency instructions through the Local Landlord Law Center.

Decision paths

The unit is covered by AB 1482 and no lower local cap applies

Calculate from the statutory base, use the percentage for the effective date, combine all prior increases within the lookback period, limit the tenancy to no more than two increments, and serve a compliant notice with the required lead time.

A local cap is lower

Use the lower lawful maximum and complete every local prerequisite. Do not assume state notice alone is sufficient.

The owner claims an AB 1482 exemption

Document the exemption before choosing an amount. Section 827’s notice periods, the lease, local law, retaliation rules, and emergency law can still apply even when section 1947.12 does not.

The tenancy is fixed term

Determine whether the lease authorizes an increase during the term. If not, evaluate the renewal or post-term tenancy without assuming the tenant’s continued occupancy creates vacancy decontrol.

The unit is subsidized or regulated

Follow the governing program documents and agency procedure. Section 827(c) recognizes that a statute, regulation, recorded regulatory agreement, or contract can require a longer notice period.

An emergency declaration may apply

Pause the ordinary calculation. Confirm the declaration, location, covered period, any extension, Penal Code section 396, and any local emergency order before quoting or serving an increase.

Examples with explicit assumptions

Example 1: Orange County increase effective July 31, 2026

Assume a covered unit with a lowest gross rent of $2,500 during the prior 12 months, no prior increase, no local cap, no concession, no emergency restriction, and a valid timely notice. The published statewide percentage for an effective date of July 31, 2026 is 8.0%. The assumed maximum increase is $200, resulting in $2,700.

Example 2: The same unit effective August 1, 2026

Keeping every other assumption the same, the Attorney General’s published percentage for an increase effective August 1, 2026 is 8.7%. The assumed maximum increase is $217.50, resulting in $2,717.50. The new period applies because of the effective date, not because of when the notice was drafted.

Example 3: Prior increase affects both amount and notice

Assume an exempt periodic tenancy was increased from $2,000 to $2,120 six months ago and the owner now proposes $2,240. The second increase cannot be considered in isolation. For section 827, the owner must compare the combined increase during the relevant 12 months with a rent charged during that period to determine whether the 30-day or 90-day rule applies. Local, contract, emergency, and retaliation limits still require separate review.

These examples assume facts that may not exist at an actual property and are not instructions to use a particular amount.

Common mistakes

• Using the percentage for the wrong county or effective period.
• Failing to distinguish a statewide cap from the section 827 notice threshold.
• Calculating from the latest charge instead of the required lookback base.
• Ignoring concessions or a reduction in housing services.
• Forgetting an earlier increase within the preceding 12 months.
• Assuming an AB 1482-exempt unit has no increase restrictions.
• Counting a mailed notice as though personally delivered.
• Serving a notice before confirming local registration or filing requirements.
• Treating a lease renewal with the same tenant as a vacant new tenancy.
• Overlooking an emergency declaration, retaliation issue, subsidy rule, or translation requirement.

When legal review is worthwhile

Review is particularly useful when:

• Title or entity ownership makes exemption status uncertain.
• A building is approaching its 15-year certificate-of-occupancy anniversary.
• The proposed effective date crosses August 1 or a local adjustment date.
• Prior increases, concessions, fees, utilities, or reduced services complicate the base.
• A local registry or rent program applies.
• The tenant recently reported conditions, requested an accommodation, joined an association, or exercised another protected right.
• The property is subsidized, deed restricted, or governed by a regulatory agreement.
• An emergency declaration may cover the property.
• The owner expects nonpayment and is considering a later possession case.

Law Laguna can review the lease, property coverage, ledger, local program, calculation, notice language, service method, and timeline. The work is preventive and pre-litigation. If a later filed dispute requires court representation, the firm can organize the file and coordinate a transition to appropriate litigation counsel; this page does not promise an appearance in court.

Related services and guides

• Rent Control and Just-Cause Compliance
• California Tenant Protection Act and AB 1482
• AB 1482 Exemptions and Property Coverage
• Costa-Hawkins and Local Rent Control
• Emergency Price-Gouging Rules for Rental Housing
• Lease Changes, Renewals, and Month-to-Month Tenancies
• Local Landlord Law Center

Primary legal sources

• Civil Code section 827
• Civil Code section 1947.12
• Code of Civil Procedure section 1013
• Civil Code section 1942.5
• Penal Code section 396
• California Attorney General rent-cap information
• Cal OES emergency proclamations

Laws and local procedures change. This page is general information, not legal advice. Verify the current declaration, rate, fee, form, or agency instruction before acting.

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A clean calculation file should show the legal cap, calculation base, effective date, prior increases, local requirements, notice language, and proof of service.

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