Key Takeaways
- The state cap is 5% plus inflation, never more than 10% in a 12-month period.
- There are three layers of rules. A 1995 state law, the 2019 state cap, and your city’s own rules.
- Some homes have no cap at all. That is the honest answer, and it is worth knowing quickly.
- Check your lease. A single-family exemption only works if specific wording is written in it.
- Notice matters. 30 days for increases up to 10%, 90 days above that.
- Do not just refuse to pay. There are safer ways to challenge an over-cap increase.
What this guide covers
- How California rent control actually works: three layers
- The state cap: 5% plus CPI, 10% maximum
- Is your home covered? The exemption check
- Cities with their own rent control
- Notice rules for any increase
- When an increase is illegal regardless of amount
- Your playbook for an over-cap increase
- What voters decided about rent control
- Where to get help
- California rent control FAQ
You opened a rent increase notice and the number made your stomach drop. Now you are trying to work out whether they are even allowed to do that.
The honest answer is: it depends which rules cover your home. California does not have one rent control system. It has three sets of rules stacked on top of each other. Which ones reach you depends on your building, its age, and your city.
Let’s find your layer first. Everything else follows from that.
How California Rent Control Actually Works: Three Layers
Layer 1 — Costa-Hawkins: what cities cannot control
A 1995 state law called Costa-Hawkins sets the outer boundary. It tells cities what they are not allowed to put under local rent control:
- Most single-family homes and condos
- Housing built after February 1995 (or an earlier date set by a city’s own older ordinance)
- The rent for a new tenant, which is called vacancy decontrol
That last one explains something renters find baffling. In a rent-controlled building, when a tenant moves out, the landlord can usually reset the rent to market for the next person. The unit is controlled, but only while you stay in it.
Layer 2 — AB 1482: the statewide cap
In 2019 California added a statewide cap through the Tenant Protection Act, known as AB 1482. It covers a lot of housing that local rent control cannot touch. The ceiling is 5% plus regional inflation, and never more than 10% in a 12-month period.
Think of it as a floor of protection across the whole state, rather than true rent control.
Layer 3 — Local ordinances: where protections go further
Cities with their own rent control usually allow much smaller increases. Sometimes just a few percent a year, set by a local rent board.
Where a local rule gives you more protection, that is the one that applies.
Find your layer in four questions
1. What kind of home is it? Single-family house or condo? Local rent control probably cannot reach it, and the state cap only applies if the exemption conditions are not met. Apartment building? Keep going.
2. When was it built? Within the last 15 years, the state cap generally does not apply. Older than the cutoff in your city’s ordinance, local rent control may apply.
3. Which city are you in? Los Angeles, San Francisco, Oakland, Berkeley, Santa Monica, San Jose and others have local rent control with lower caps.
4. Does the owner live there? Owner-occupied duplexes and shared-kitchen situations are usually exempt from the state cap.
Local rent control gives you the most protection. The state cap is the next best. And some homes have neither.
The State Cap: 5% Plus CPI, 10% Maximum
The formula and the once-per-year rule
Where AB 1482 applies, the maximum increase in any 12-month period is:
5% + your regional inflation figure (CPI), or 10%, whichever is lower.
Your landlord cannot get around this by raising rent twice in a year. The cap covers the total across 12 months. There is also a limit on how many increases they can make.
Finding your region’s CPI figure
CPI stands for Consumer Price Index, which is a measure of inflation. California uses a regional figure. It differs between the Bay Area, Los Angeles, San Diego and other parts of the state. It is updated every year.
Because it changes, do not trust a number from an old article. Ask your local rent board or your city housing department for the current figure for your region.
Worked examples
| Current rent | If CPI is 3% | Max increase | New rent |
|---|---|---|---|
| $1,800 | 5% + 3% = 8% | $144 | $1,944 |
| $2,400 | 5% + 3% = 8% | $192 | $2,592 |
| $2,400 | If CPI were 6%, that is 11%, so capped at 10% | $240 | $2,640 |
The 10% ceiling is a hard stop. Even if 5% plus CPI comes out higher, 10% is the most it can be under the state cap.
These are examples with a made-up CPI to show the method. Use your actual regional figure for the real number.
Is Your Home Covered? The Exemption Check
New construction and the rolling 15 years
Homes built within the last 15 years are generally exempt from the state cap. This rolls forward every year. So a building that was exempt when you moved in can become covered later. If you have been somewhere a while, check again.
Single-family homes and the lease-language requirement
The check that changes outcomes
A single-family home or condo is only exempt if both of these are true:
1. The owner is not a corporation, a real estate investment trust, or an LLC with a corporate member.
2. Your lease contains specific written notice telling you the property is exempt.
If that notice is not in your lease or an addendum, the exemption may not hold, which means the cap may protect you after all.
Search your lease for “1946.2”, “1947.12”, or “exempt”. Found nothing? Take the lease to legal aid or your local rent board.
The honest answer when nothing caps your rent
Sometimes there is no cap. A newer apartment building in a city with no local rent control can be raised by any amount. So can a single-family home that is properly exempt. They still need to give proper notice.
That is hard to hear, and most articles bury it. But knowing early saves you from arguing a point you cannot win. It lets you focus on what you can do. Negotiate. Ask for more time. Get help with moving costs. Or start looking sooner.
Even then, two things still apply. Your landlord must give proper notice, and the increase cannot be retaliation or discrimination.
Cities With Their Own Rent Control
The major local systems and how they differ
Many cities run their own systems. They include Los Angeles, San Francisco, Oakland, Berkeley, Santa Monica, West Hollywood, San Jose, Richmond, Alameda and Mountain View. Parts of unincorporated Los Angeles County do too.
They differ in a few ways. Which buildings are covered, usually by an age cutoff. The yearly allowable increase, often much lower than the state cap. Whether landlords can pass certain costs on to you. And whether there is a rent board where you can file a petition.
Vacancy decontrol: why rent resets between tenants
Because of Costa-Hawkins, something happens when a tenant moves out of a rent-controlled unit. The landlord can usually set the rent at market for the next person. That is why the tenant before you may have paid far less for the same apartment.
Once you are in, the annual limits protect you while you stay. It is a strong reason not to move if you are in a controlled unit with a good rent.
How to check your city
Search your city name plus “rent board” or “rent stabilization”. Or call your city or county housing department and give them your address. Many cities have a lookup tool. Local tenant groups and legal aid know these rules well too.
City pages with local help: Los Angeles, San Francisco, Oakland, San Jose, San Diego, Sacramento, Long Beach, Fresno.
Notice Rules for Any Increase
30 days vs 90 days
These apply whether or not a cap covers you:
- Increase of 10% or less: at least 30 days’ written notice
- Increase above 10%: at least 90 days’ written notice
The percentage is measured against the lowest rent you were charged in the past 12 months. So a landlord cannot split one big increase into two small ones to dodge the 90-day rule.
When bad notice makes an increase unenforceable
An increase that does not give the required notice period generally cannot take effect on the date stated. If your landlord gave 30 days for a 20% increase, the notice is short.
Do not simply refuse to pay. Write to your landlord, point out the notice period, and say what you believe the correct effective date is. Keep a copy.
When a Rent Increase Is Illegal Regardless of Amount
Retaliation and discrimination
Even an exempt home cannot be used to punish you. Say your rent jumped soon after you asked for repairs, called code enforcement, or joined a tenant group. That can be retaliation under Civil Code 1942.5.
An increase aimed at you because of who you are is discrimination. That covers race, national origin, religion, sex, disability, family status, immigration status, and source of income.
In both cases, timing and paper are your evidence. Write down the date you complained and the date the notice arrived.
Rent going up faster than your income?
A free two-minute check shows which California programs may help with rent, deposits, or utilities in your county.
Check My Eligibility FreeYour Playbook for an Over-Cap Increase
Step 1: Check the math and the coverage
Work out the percentage. Divide the increase by your current rent. Then check what covers your home: local rent control, the state cap, or nothing. Then check the notice period. Write down what you find.
Step 2: Respond in writing
Keep it calm and factual. Something like: “I received a notice raising my rent from $X to $Y, an increase of Z%. I believe this property is covered by [the state cap / the city ordinance], which limits increases to [amount]. Please confirm the correct amount, or explain why you believe the property is exempt.”
Send it in a way you can prove, and keep a copy. Many increases get fixed right here. Plenty of landlords simply got the number wrong.
Step 3: Rent boards and complaints
In a city with a rent board, you can usually file a petition and they will investigate. Elsewhere, your city or county housing department may handle complaints. Local legal aid can advise you too.
Step 4: The risks of just not paying the excess
Be careful here. If you believe an increase is illegal, paying only the old amount feels logical, but it is risky. If you turn out to be wrong about coverage, you are now behind on rent and exposed to a 3-day notice and an eviction case.
Safer approach: raise it in writing first, get advice from legal aid or your rent board before the increase takes effect, and if you do withhold the difference, set that money aside rather than spending it.
What Voters Decided About Rent Control
Prop 33 and where the law stands
Voters have been asked more than once to repeal Costa-Hawkins. That would let cities expand rent control to single-family homes, newer buildings, and new-tenant rents. Most recently, Proposition 33 was rejected.
So the two-layer system stands. Cities still cannot bring most single-family homes, newer buildings, or new-tenant rents under local rent control. The statewide cap remains the wider protection.
For renters, the practical upshot is simple. The rules described on this page are the rules, and the fastest way to know where you stand is the coverage check rather than following ballot news.
Where to Get Help
Rent boards, legal aid, and the OAG
If your city has a rent board, start there. They know exactly which units are covered and this year’s allowable increase. Legal aid advises income-qualifying renters for free. The California Attorney General’s office runs a renter rights hub. Your city or county housing department can confirm which rules apply to your address.
California rental assistance programs
Dial 211 for local referrals. A free eligibility check against 100+ California rental assistance programs takes about two minutes.
Related reading: AB 1482 Tenant Protection Act for the act as a whole, just cause eviction California for the eviction side, and California tenant rights for everything else.
California Rent Control FAQ
How much can a landlord raise rent in California?
If the state Tenant Protection Act covers your home, the maximum is 5% plus your regional inflation figure, and never more than 10% total in a 12-month period. If you live in a city with its own rent control, the local limit is usually much lower and that one applies. If your home is exempt from both, there is no cap on the amount, though your landlord still has to give proper notice and cannot raise rent as retaliation or discrimination.
What buildings does AB 1482 cover?
Broadly, apartment buildings and other rentals older than 15 years, plus single-family homes and condos where the owner is a corporate entity or where the required exemption notice is missing from the lease. It does not cover most newer construction, owner-occupied duplexes, shared-kitchen or shared-bathroom situations with the owner, dorms, hotels, or care facilities. Some deed-restricted affordable housing has its own separate rules.
Is my single-family home rent controlled?
Probably not under local rent control, because Costa-Hawkins generally keeps cities from covering single-family homes. But it may still be covered by the state cap. The exemption only works if the owner is not a corporate entity and your lease contains specific written notice saying the property is exempt. If that language is missing from your lease, the state cap may apply after all. Go read your lease before assuming you have no protection.
How often can rent be raised?
Under the state cap, the total across any 12-month period cannot exceed the limit, and there is a restriction on how many increases can be made in that period. So a landlord cannot raise rent repeatedly in small amounts to get past the cap. In a fixed-term lease, rent generally cannot go up mid-term unless the lease itself allows it. Cities with rent control usually allow just one increase per year.
What happens if my landlord raises rent above the cap?
Start by checking the math and confirming whether your home is covered, then write to your landlord setting out what you believe the correct amount is. Many increases are simply mistakes and get corrected at that stage. If not, file a petition with your local rent board if you have one, or contact your housing department and legal aid. Be careful about simply paying the old amount, because if you are wrong about coverage you become a tenant behind on rent, which is a much worse position.