Rent Increase Notice Checker

Is this rent increase allowed, and when can it start?

Paste your rent roll with the proposed new rent for each unit. The page checks each one against the state cap, works out the notice period and the earliest effective date, shows the most you can ask where a unit is over, and writes a notice letter for each unit that can go out.

The list is read in this browser tab and never leaves your device. It is a first check from statutes as read by the author, not a ruling: local rent control and exemptions are not modelled. Confirm with a landlord-tenant attorney or your association before serving notice.

1. Your rent roll

A CSV or pasted spreadsheet range with a header row. Required columns: unit, current rent, proposed rent. Optional: tenant, rent 12 months ago (the lowest rent in the last year; defaults to current), tenancy start, last increase, exempt (yes/no), good cause (yes/no, New York).

Choose a CSV file …or paste the list

2. The state and the dates

State

CPI change, percent (used for the cap)

Date you will give notice

Planned effective date (optional)

Notice days (another state only)

Landlord name for the letters (optional)

Notices will be served by mail (adds the state's mailing days, California only)

Choose a file or paste the list, then click Check the increases.

The rules it applies, and what it leaves out

California (Civil Code 1947.12 and 827): cap of 5% plus CPI, at most 10%, from the lowest rent in the last 12 months; 30 days notice, 90 if the increase is over 10%; five more days by mail.
Oregon (ORS 90.323): cap of 7% plus CPI, at most 10%; 90 days; none in the first year; one in 12 months.
Washington (RCW 59.18.140): cap of 7% plus CPI, at most 10%; 90 days.
New York (Real Property Law 226-c, Good Cause Eviction Law): 30, 60 or 90 days for increases of 5% or more by length of tenancy; the 5% plus CPI (at most 10%) cap only for units marked good cause.
Rules reviewed: 2026-10-06, by the author from the statutes, not by a lawyer. States publish their yearly maximum; if it differs from the formula, trust the state.
Not decided: whether a unit is covered or exempt, local rent control and just-cause ordinances, rent-stabilized and subsidised units, lease terms, how a notice must be served, retaliation rules, and whether a notice you send is valid.

Common questions

How much notice does a landlord have to give for a rent increase?

It depends on the state and sometimes on the size of the increase. California is 30 days for an increase of 10% or less over 12 months and 90 days above that. Oregon and Washington are 90 days. New York is 30, 60 or 90 days for increases of 5% or more, depending on how long the tenant has lived there. This page applies those rules to every unit and dates the notice; check the statute for your building.

How is the California rent cap worked out?

Under AB 1482 the most a covered landlord can raise rent in 12 months is 5% plus the local change in the consumer price index, never more than 10%, measured from the lowest rent charged in the prior 12 months. Enter your area's CPI figure and the page does the arithmetic to the cent.

Do these rules apply to my building?

Not always. New construction, some single-family homes, rent-controlled and rent-stabilised units and others are exempt or governed by different rules, and many cities add their own. Mark a unit exempt in the list to skip the cap, and treat the result as a first check, not a ruling.

Does mailing the notice change the deadline?

In California, service by mail adds five calendar days. Tick the mailed box and the page adds them for California; for other states, read your service rules.

Is my rent roll uploaded anywhere?

No. It is read in your browser and nothing is sent; a test in the code asserts there are no network calls.