How much notice do you need to raise rent in California?

In California, a landlord must give 30 days written notice before raising rent on a month-to-month tenancy (Cal. Civ. Code 827(b); 1947.12 (AB 1482)). If the increase is more than 10% in a year, California requires 90 days instead. On a fixed-term lease the rent cannot change mid-term; it changes at renewal. That is the whole answer for most California landlords in 2026.

The rule

The notice has to be in writing and delivered before the new rent starts. The governing rule is Cal. Civ. Code 827(b); 1947.12 (AB 1482). If the increase is more than 10% in a year, California requires 90 days instead. A fixed lease locks the rent for the term, so an increase waits until renewal.

If your city or property type is different

Many California cities (Los Angeles, San Francisco, Oakland, San Jose, Berkeley, Santa Monica) have stricter local rent control. Check your city.

A worked example

Say the rent is $1,500 and you want to raise it to $1,575, and you send written notice on September 1, 2026. With 30 days notice, the earliest the new rent can start is October 1, 2026. Put the amount, the new rent, and the effective date in the letter, and keep proof of delivery.

Do it in 60 seconds

The free rent-increase notice generator fills your state's rule in and writes the letter for you. Free, no account.

How much you can raise

California limits the amount, not just the notice. California is the only one of these states with a rent-increase-specific statute (Civ. Code 827): 30 days notice if the increase is 10% or less, 90 days if more. The 10% is measured CUMULATIVELY over 12 months, so count prior increases in the same year. On AMOUNT, AB 1482 (Civ. Code 1947.12) caps annual increases at 5% + regional CPI or 10%, whichever is lower, for covered units (generally 15+ years old, a rolling exemption; SFR/condos owned by natural persons exempt only if the statutory notice was given; new construction exempt). AB 1482 sunsets Jan 1, 2030.

What the notice has to say

A rent-increase letter is short, but leaving a piece out is the most common way one gets challenged. Include all of it:

The property address, including the unit
The tenant's name, spelled as it appears on the lease
The current rent and the new rent, both as dollar amounts
The date the new rent starts
The date you are sending the notice
Your name and how to reach you

Say nothing about why the rent is going up. You are not required to give a reason, and a volunteered one can become the argument.

How to deliver the notice so it counts

Getting the notice period right does not help if you cannot show the tenant received it. Deliver it in writing and keep proof:

Hand it to the tenant directly, and note the date you did.
Mail it with tracking or certified mail so you have a receipt. Mail takes time to arrive, so send it early enough that the full notice period runs before the new rent starts.
Email or text it only if your lease says notices can be sent that way. Many leases require paper.
Post it on the door only if your lease or California law allows that method, and photograph it in place if you do.

Keep a copy of the letter itself, not just proof of sending. If the increase is ever disputed, the letter and the delivery receipt together are what settle it.

Mistakes that cost landlords the increase

Counting from the wrong day. The clock runs from when the tenant receives the notice, not when you wrote it. Mailing it on the last possible day is how a valid increase becomes an invalid one.
Starting the new rent mid-period. Rent increases normally take effect at the start of a rental period. Line the effective date up with a rent due date.
Raising rent inside a fixed term. Rent is fixed for the term; it changes at renewal unless the lease allows. The size tier and rent cap still apply at renewal.
Only telling them verbally. A conversation is not notice. Put it in writing even when the tenant already agreed on the phone.
Ignoring a local ordinance. City rules stack on top of state rules, and where they differ the longer notice usually wins. Check your city before you send.
Raising rent right after a complaint. Retaliation and fair-housing rules still apply to an increase. If the tenant recently requested a repair or reported a code issue, talk to a local attorney before raising the rent.

Common questions

Does a rent increase have to be in writing?

Yes. The notice must be in writing and delivered before the new rent starts (Cal. Civ. Code 827(b); 1947.12 (AB 1482)).

Can I raise the rent in the middle of a fixed-term lease?

No. On a fixed lease the rent is set for the term and changes only at renewal, unless the lease itself allows a mid-term change.

What happens if I give too little notice in California?

The increase can be unenforceable until proper notice is given, and the tenant may owe only the old rent in the meantime. Give the full required notice and keep proof.

Does the notice period count from when I send the letter or when the tenant gets it?

Count from receipt, not from sending. If the notice goes by mail, add mailing time so the full period still runs before the new rent starts, and keep the delivery receipt.

Can a tenant refuse a rent increase in California?

A tenant on a month-to-month tenancy who receives proper notice can accept the new rent or give their own notice and move out. They cannot keep the tenancy at the old rent once a valid increase takes effect.

Do I have to give a reason for raising the rent?

No. A reason is not required, and the increase cannot be retaliatory or discriminatory. Most landlords say nothing beyond the new amount and the effective date.

Other states

Rules change at the state line, and a landlord with property in more than one state cannot assume the number carries over.

The full table of notice periods by state covers every state we have verified.

Verified 2026-07-23 - Cal. Civ. Code 827(b); 1947.12 (AB 1482). Source: https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV&sectionNum=827

This is not legal advice.