How Much Can a Landlord Raise Rent in California?

A rent increase notice can knock the wind out of you — especially when the number feels impossible. But in California, your landlord can’t just pick a figure. For most renters, a statewide law puts a firm ceiling on how much, how often, and with how much warning your rent can go up. Knowing that ceiling is the difference between paying an increase you owe and paying one that’s flatly illegal.

The 2026 Rent Cap, in Plain Terms

California’s rent cap comes from Civil Code §1947.12, better known as AB 1482 or the Tenant Protection Act. For any covered unit, it limits a rent increase over a 12-month period to:

• 5% plus the percentage change in the cost of living (regional inflation, measured by the Consumer Price Index), or
• 10% — whichever number is lower.

That 10% is an absolute ceiling. Even in a year of high inflation, a covered tenant’s rent can’t legally jump more than 10% in twelve months. The inflation piece changes every region and every year, so the “5% plus CPI” figure moves — but because California has seen inflation in the mid-single digits, the practical cap for the 2026–2027 cycle sits in the 8% to 9% range for most of the state (about 8.7% for Los Angeles and Orange County renters). Because these numbers reset each August, the safest move is to confirm the current figure for your specific area with the California Apartment Association’s CPI calculator or your local rent board before assuming an increase is legal.

Two more limits landlords forget

The cap isn’t just about the percentage. The same law adds two rules that trip up a lot of landlords:

• No more than two increases in 12 months. A landlord can raise the rent at most twice in a 12-month window for the same tenant — and the combined total of those increases still can’t exceed the annual cap. Two 6% bumps in one year isn’t allowed; together they blow past the limit.
• No “banking” unused increases. If your landlord skipped raising the rent for a few years, they can’t stack those missed years into one giant hike. The cap applies to each 12-month period on its own — so you can’t be hit with a surprise 25% increase because the rent “hasn’t gone up in a while.”

One thing the cap does not control: the starting rent. When a unit is vacant and a brand-new tenant moves in, the landlord can set the initial rent at market rate. The cap only kicks in on increases during your tenancy.

Is Your Place Even Covered?

Here’s the catch: AB 1482 covers most California rentals, but not all of them. Landlords know this, and some claim an exemption they aren’t actually entitled to. A unit is generally exempt from the statewide cap if it falls into one of these categories:

• New construction. Housing with a certificate of occupancy issued within the last 15 years. This rolls forward continuously — a building that hits its 15-year mark becomes covered the next day.
• Single-family homes and condos — but only with strict conditions (more on this below).
• Owner-occupied duplexes, where the owner has lived in one of the two units as their primary home since the start of your tenancy.
• Deed-restricted affordable housing, dorms, and certain other specialized housing.

This is one of the most common places renters get overcharged: a corporate-owned single-family rental, or one with no exemption notice in the lease, getting a double-digit increase as if the cap didn’t apply. If that sounds like your situation, our guide to lease terms and rent-control protections digs deeper into the clauses landlords can’t enforce.

The Notice They Must Give You

Even a perfectly legal increase is void if the landlord botches the notice. Under Civil Code §827, the amount of advance written notice depends on how much the rent is going up over the trailing 12 months:

• Increase of 10% or less: at least 30 days’ written notice.
• Increase of more than 10%: at least 90 days’ written notice.
• Served by mail? Add 5 calendar days to either deadline.

The notice has to be in writing and actually delivered — a text message or a casual email usually doesn’t cut it unless your lease specifically provides for electronic notice. It should state the new dollar amount and the date the increase takes effect. If your landlord raised your rent with a phone call, a text, or too little warning, the increase may not be enforceable yet.

Local Rent Control Can Be Much Lower

AB 1482 is a statewide floor of protection — not the whole story. Many California cities have their own rent-control ordinances that cap increases far below the state number, and where a local law is stricter, it wins. In places like Los Angeles, Santa Monica, San Francisco, Oakland, and others, rent-stabilized units have often been limited to low single-digit increases — sometimes just 1–4% — well under the state cap.

These local limits change frequently and vary building by building (they usually apply to older multi-unit properties). If you live in a rent-controlled city, the percentage your landlord can charge may be much smaller than the statewide figure — so it’s always worth checking your city or county rent board for the current local cap. For the bigger picture on how these layers fit together, see our overview of illegal rent and overcharges in California.

When a Rent Increase Crosses the Line

An increase isn’t legal just because it arrived on official-looking letterhead. Watch for these warning signs that your raise may break the law:

• It’s over the cap. More than the 5%-plus-CPI figure (or more than 10%) on a covered unit.
• It’s a phantom exemption. A double-digit hike on a single-family home with no exemption notice in your lease, or one owned by a corporate entity.
• It comes mid-lease. Your rent generally can’t be raised during a fixed-term lease unless the lease itself allows it.
• The notice was short or informal. Less than 30 (or 90) days, or delivered by text.
• It looks like payback. If the rent jumps right after you requested repairs, reported a code violation, or joined a tenant group, it may be retaliatory. California law (§1942.5) presumes an increase within 180 days of you asserting your rights is retaliation — and puts the burden on the landlord to prove otherwise. Our guide to landlord retaliation covers this in detail.
• It’s during a declared emergency. After a declared state of emergency (like a wildfire), a separate law — Penal Code §396 — can cap increases at 10% above the pre-emergency price, even on otherwise-exempt units, for a limited time in the affected area.

What to Do If Your Increase Is Illegal

If you think your rent went up beyond what the law allows, here’s how to protect yourself without making things worse:

1. Don’t just stop paying. Refusing to pay can hand your landlord grounds to evict. The safer route is often to keep paying the legal amount, or to pay the increase “under protest” in writing while you challenge it.
2. Keep every notice and receipt. Save the increase letter, your lease (check it for any exemption language), and a record of what you’ve paid. The paper trail is your leverage.
3. Check the math and the exemption. Confirm the percentage against your region’s current cap, and confirm whether your unit is truly exempt — including whether that §1947.12(d)(5) notice is actually in your lease.
4. Use your rent board or small claims. A local rent board can order an unlawful increase rolled back, and overcharge disputes often fit small claims court (up to $12,500).
5. Talk to a tenant attorney. Because the law can shift the landlord’s legal fees onto them, getting a case reviewed costs you nothing to start.

Frequently Asked Questions

This guide is general information about California law, not legal advice, and it doesn’t create an attorney-client relationship. Rent-cap figures, local ordinances, and emergency rules change — for advice about your specific increase, talk to a tenant attorney licensed in California.