Two Rent Increases, One Cap: How the AB 1482 Two-Increment Rule Works in San Diego County

Updated September 2026 | Authored by Scott Engle, Broker DRE #01332676 | Realty Management Group | Serving San Diego County Since 2005

Last verified against primary sources: September 20, 2026.

California lets a landlord raise a covered tenant's rent twice in twelve months. It does not let the two increases each carry the cap. They share it, and the second one is measured against the lowest rent of the prior twelve months, not the rent you just raised. Splitting 8.2% into two increases of 4.1% breaks the cap on every rent level, by a small amount, every time.

This page works the arithmetic at three rent levels, shows where the base comes from, sets out the notice period for each increase under Civil Code §827, and explains what happens when the second increase crosses August 1. Every rule was read against the code text on September 20, 2026.

Civil Code §1947.12 (AB 1482, the Tenant Protection Act of 2019), in effect through January 1, 2030. General information, not legal advice.

Two Rent Increases Under AB 1482 at a Glance, San Diego County

Source: California Civil Code §§827 and 1947.12 and Code of Civil Procedure §1013, official text read September 20, 2026; BLS CPI-U San Diego-Carlsbad, March 2026 release, for the 8.2% figure.

What Civil Code §1947.12(a)(2) Allows

Two subdivisions do the work, and they have to be read together.

The second sentence ends with the words that matter: subject to the other restrictions. Paragraph (2) permits a second increment. It does not give the second increment its own cap. Both increments live inside the single cap in paragraph (1), and paragraph (1) measures that cap against the lowest rent in the prior 12 months. For San Diego County the cap is 8.2% for increases effective August 1, 2026 through July 31, 2027: 5% plus the 3.2% change in the BLS CPI-U for San Diego-Carlsbad, March 2025 to March 2026. The derivation is in our San Diego rent cap guide.

Bottom line: two increments, one cap, one base. Everything else on this page follows from that sentence.

Why 4.1% Twice Breaks the 8.2% Cap

Short answer: because the second 4.1% is taken on a bigger number. Percentages compound; the cap does not.

A common approach is to halve the cap: 4.1% now, 4.1% later. The first increase is fine. The second one, if calculated on the rent as increased, lands above the ceiling on every rent level, because 1.041 times 1.041 is 1.0837, not 1.082.

Source: Realty Management Group calculation from Civil Code §1947.12(a)(1) at the 8.2% San Diego County cap. La Mesa and Poway figures are RentCast average asking rents retrieved August 2026 through Realty Management Group's subscription account; RentCast per-ZIP reports have no public per-figure URL. The $1,000 and $2,500 rows are illustrative.

The overage looks trivial. It is not the overage that costs money. Under §1947.12(k), an owner who demands or collects rent above the maximum is liable for the excess, for injunctive relief, for attorney's fees at the court's discretion, and for up to three times the excess on a showing of willfulness, oppression, fraud, or malice, with a three-year limitations period. An unlawful rent demand can also complicate a later unlawful-detainer action, because the amount demanded was not the amount lawfully due.

The statutory text is not obscure. A California Lawyers Association treatment of the Tenant Protection Act quotes both the two-increment sentence and the lowest-rent-in-12-months base in full. What it and most summaries stop short of is the arithmetic those two sentences produce together, which is the table above.

The lawful version of the same plan is a first notice of 4.1% and a second notice for the dollar amount that brings the rent to the ceiling. On $1,000 that is $41 and then $41. The second notice reads as 3.94% of the current rent, and that is correct, because the statute never asked what percentage of the current rent it was.

Bottom line: calculate every increment from the base and state the second notice in dollars, so the arithmetic is visible on the face of the notice.

What Is the Base for the Second Increase?

Short answer: the lowest rent charged for the unit at any time in the 12 months before the second increase takes effect. If the old rent was charged anywhere in that window, the old rent is the base.

This is the part of §1947.12(a)(1) that the halving error skips. The cap is not a percentage of the current rent. It is a percentage of the lowest gross rental rate charged in the 12 months before the effective date. A first increase does not move the base until the pre-increase rent has been out of the window for a full year.

The same logic answers the question owners ask next: what if the first increase was smaller? A first increase of 3% leaves 5.2% of the base for the second. A first increase of 5% leaves 3.2%, which on $2,500 is $80. The second notice is always ceiling minus current rent, and the ceiling never moves inside the window.

Bottom line: the base is a lookback, not a snapshot. Pull the 12-month rent history before every notice.

How Much Notice Does Each Increase Need Under Civil Code §827?

Short answer: 30 days before each effective date on a covered unit, served personally or by mail, and §827 makes a mailed notice subject to the five-day extension in Code of Civil Procedure §1013. The 90-day period applies only where the increases in the prior 12 months add up to more than 10%, which the cap prevents.

Each increment is its own notice. Civil Code §827(b) requires written notice by personal delivery or by mail, delivered at least 30 days before the effective date if the increase is 10% or less "of the rental amount charged to that tenant at any time during the 12 months before the effective date of the increase, either in and of itself or when combined with any other rent increases for the 12 months before the effective date," and at least 90 days if it is more than 10%. Both periods are stated in the statute as "subject to Section 1013 of the Code of Civil Procedure if served by mail," and §1013(a) extends any notice period by five calendar days when the notice is mailed to and from an address within California, ten days if mailed to an address outside the state, and twenty if outside the United States.

Two consequences. First, on a covered unit the two increases together cannot exceed 8.2%, so neither notice can reach the 10% line, and 30 days applies to both. Second, on an exempt unit, where §1947.12 does not limit the amount, the cumulative test in §827 still runs: a 6% increase followed six months later by a 5% increase puts the second notice at 11% combined, and it needs 90 days even though it is 5% on its own. That is the trap on exempt single-family homes, and it is a §827 trap, not an AB 1482 one.

Section 827(b)(1) names two methods of service and no others: delivering a copy to the tenant personally, or serving it by mail under §1013. Text and email are not among them. If the tenancy has been running on texts, do not rely on a text to serve the increase; use one of the two authorized methods. The full notice procedure, including the form of the notice and what happens when the effective date falls mid-month, is in our San Diego rent increase guide.

Bottom line: 30 days each, counted back from the effective date, served personally or by mail; a mailed notice picks up the §1013 extension, five days in-state.

What Happens to a Second Increase After August 1?

Short answer: the cap percentage resets to the new CPI figure, and the base is still the lowest rent in the prior 12 months, which is usually the old rent. The room left is the new ceiling minus the current rent, and it can be less than the new percentage suggests.

Under §1947.12(g)(3)(B), an increase effective on or after August 1 uses the change in CPI from April of that year to April of the prior year, and an increase effective before August 1 uses the prior year's pair. Because BLS publishes the San Diego-Carlsbad index on odd-numbered months only, there is no April figure for San Diego County and the statute's fallback applies: March to March. That is why the San Diego cap is knowable in April and changes on August 1.

Two increments in a 12-month period also counts across the line. November 1, 2026 and August 1, 2027 are nine months apart and both sit inside one 12-month period, so a third increase waits until the November 1, 2026 increment is twelve months old. The 2027 cap figure is not known until the March 2027 CPI is published in April 2027; any number quoted for it before then is a guess, and this page does not make one.

Bottom line: August 1 resets the percentage, not the base. Owners who took a partial increase mid-year find less room in August than the new percentage suggests.

Which Units the Two-Increase Rule Applies To

Section 1947.12 applies to covered residential real property. It does not apply to the categories in subdivision (d), and the ones that matter most in San Diego County are housing issued a certificate of occupancy within the previous 15 years, and a single-family home or condo that is separately alienable, owned by an individual rather than a corporation, REIT, or LLC with a corporate member, and whose tenants have been given the exemption notice in the statutory wording under §1947.12(d)(5)(B)(ii); for a tenancy commenced or renewed on or after July 1, 2020, subclause (iii) requires that notice to be in the rental agreement. The exemption is conditioned on the notice, so a home whose lease lacks it does not qualify for the exemption and subdivision (a) applies to it. Which properties qualify, and the exact notice wording, are in our AB 1482 exemptions guide.

The cap is a state figure and it is the same in every San Diego County city. As of our August 2026 review, no city in the county sets a lower rent cap than the state's; the City of San Diego ordinance adds day-one just cause and relocation rules, Chula Vista adds its own just-cause ordinance, and Imperial Beach adds notice requirements; none of the three changes the percentage. An owner in Escondido, National City, or Mission Valley with no local ordinance at all runs the same arithmetic. Which cities add what is in our San Diego County rent control by city guide.

A new tenancy resets everything. Under §1947.12(b), when no tenant from the prior tenancy remains in lawful possession, the owner sets the initial rent without reference to the cap, and the two-increment limit and the 12-month lookback apply to increases after that.

Bottom line: covered unit, state cap, same math countywide. Exempt unit, no cap, but §827 still governs the notice.

What the Two-Increase Rule Does Not Allow

• Two caps. Paragraph (a)(2) permits two increments. It does not double the ceiling in paragraph (a)(1).
• Compounding. The second increment is measured against the lowest rent in the prior 12 months, not the rent after the first increment.
• A mid-term increase the lease does not provide for. The statute limits how many increments a covered tenant may receive; it does not override a fixed-term lease that sets the rent for its term.
• A third increment inside 12 months. Including a renewal increase. The count is rolling, measured from the earliest increment.
• Service by text or email. Section 827(b)(1) authorizes personal delivery or mail under Code of Civil Procedure §1013. Do not rely on any other method.
• Serving on the unit while ignoring AB 628. A rent increase is a change of terms. On a unit without a stove or refrigerator, it may be the event that makes the unit untenantable. Details in our AB 628 guide.

The mistake is easy to make because dividing the annual cap in half ignores compounding, and the 12-month lookback is not visible on the face of a lease. If you would rather not carry the 12-month history for every unit yourself, that is a fair reason to hand it off; our decision guide on hiring a San Diego property manager and our 18 questions to ask before you sign are written for that decision.

Two-Increase Checklist for a Covered Unit

Frequently Asked Questions: Two Rent Increases Under AB 1482

Glossary

Gross rental rate

The rent charged for the unit, the figure Civil Code section 1947.12 caps. The statute measures both the amount of an increase and the base it is measured against in gross rental rate.

Increment

A single rent increase taking effect on a single date. Section 1947.12(a)(2) permits no more than two increments for the same tenant over any 12-month period.

Lowest gross rental rate in the prior 12 months

The base for every increase under section 1947.12(a)(1): the lowest rent charged for the unit at any time during the 12 months before the effective date of the increase. It is not the current rent.

Effective date

The date a rent increase takes effect. It fixes the 12-month lookback for the base, the cap period the increase falls in, and the day the section 827 notice period is counted back from.

Authorized service

The two methods section 827(b)(1) names for a rent-increase notice: delivering a copy to the tenant personally, or serving it by mail under Code of Civil Procedure section 1013. Text and email are not listed.

Cap period

August 1 through July 31. Under section 1947.12(g)(3)(B), increases effective on or after August 1 use that year's CPI change; increases before August 1 use the prior year's. In San Diego County the measure is March to March because the San Diego-Carlsbad index has no April figure.

Covered unit

Residential real property subject to section 1947.12, which excludes the categories in subdivision (d): housing with a certificate of occupancy in the previous 15 years, separately alienable single-family homes and condos owned by individuals with the statutory notice in the lease, owner-occupied duplexes, and others.

Sources

This guide reflects California law as of September 20, 2026. The 8.2% figure applies to increases effective August 1, 2026 through July 31, 2027 on covered units in San Diego County; the figure for increases on or after August 1, 2027 will not be known until the March 2027 CPI is published. Rent levels in the tables are illustrative. This is general information, not legal advice. Confirm your specific facts with a California licensed attorney before serving a notice.