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Is My Rent Increase Legal?

Verified state rent caps

A rent increase can feel unfair even when it is lawful, and it can be unlawful even when it looks modest. Whether an increase is legal depends on several separate questions: is there a rent cap that applies to your home, is the increase within that cap, was the right notice given in the right way and in time, and does a local ordinance impose a stricter rule? This guide helps you work through those questions in order, using only the verified statewide rules on this site and directing you to official sources for everything else.

Step 1: Is there a cap that covers your home?

Start with coverage, not the percentage. California’s AB 1482 (Civil Code 1947.12) covers certain properties but not all of them — for example, some newer buildings and some single-family homes may fall outside it, depending on the statute’s conditions. Washington’s HB 1217 (RCW 59.18.700) likewise has its own scope, and it bars any increase in the first 12 months. A property that is exempt from the state cap may still be covered by a city ordinance, and a property covered by the state cap may also be subject to a stricter city cap. If you cannot confirm coverage from an official source, do not assume either way — that uncertainty is itself a reason to check the official source or seek local advice.

Step 2: Apply the cap formula

California: maximum increase = the lower of 5% plus local CPI and 10%, per 12 months. With $2,000 rent and 3% CPI, that is 8%, so the maximum lawful rent under the state formula is $2,160. If CPI were 7%, 5% + 7% = 12% would be capped at 10%, giving $2,200. Washington: maximum increase = the lower of 7% plus CPI and 10%. With $2,000 rent and 2% CPI, that is 9%, giving $2,180; with CPI of 5% or more, the 10% ceiling binds. Note that CPI here means the relevant local or published CPI figure used by the statute or ordinance — use the figure your official source specifies, not a national headline rate you happen to have seen.

Step 3: Check timing, frequency, and notice

Even a within-cap increase can be invalid if it is given too often, too soon, or without proper notice. Washington’s rule against any increase in the first 12 months is a timing rule, not just a percentage rule. California’s cap is framed per 12 months, so two smaller increases within one 12-month period must be considered together, not in isolation. Notice periods, the form of notice, and the effective date also matter and vary by jurisdiction and lease type. Read the notice itself: does it state the old rent, the new rent, the percentage increase, and the effective date? Does the effective date leave the required notice period? Keep the notice and the envelope or delivery record.

Step 4: Check your city

This is the step most people skip, and it is often decisive. City ordinances may be stricter and may override state rules — a city may have a lower cap, a longer notice period, or coverage for properties the state cap does not reach. Search for your city’s rent rules on the city’s official site or housing department page, not just a summary blog. If your city and state give different answers, the stricter lawful rule generally governs the tenant’s protection, but the interaction can be technical — another reason to confirm with an official source when the two conflict.

What to do if the increase looks too high

• Do the arithmetic yourself and write it down, including the CPI figure and its source.
• Check coverage, timing, and notice separately — an increase can fail on any one of them.
• Contact your landlord in writing, politely, with your calculation and a request for the basis of the increase.
• Keep paying the undisputed rent if you can, and keep records, while you seek advice — do not simply stop paying without advice.
• Contact a local tenant organization, housing department, or qualified professional, especially if a deadline or eviction notice is involved.

A calculator can tell you whether a figure exceeds a verified cap formula. It cannot decide coverage, notice validity, or a city ordinance’s effect on your home. Treat a calculator result as a prompt to check the official source, not as a final legal ruling.

Worked examples: four increases, four different answers

Each example below is worked the same way, so the answers can be compared directly. The percentage increase is always (new rent minus old rent) divided by old rent, multiplied by 100. Getting that one division wrong is the most common arithmetic error in rent-cap checks.

Example 1 is the clean pass. At $2,000 with 3% CPI, California allows 8%, which is $160, so $2,160 is exactly at the maximum. A $2,161 rent in that scenario would be $1 over the state formula, before any city rule is considered. Example 2 shows why the ceiling matters: 5% + 7% CPI is 12%, but the formula takes the lower of that figure and 10%, so the maximum is $2,200 and a $2,250 proposal is $50 over. Example 3 is a Washington pass at a different rent level: 9% of $1,800 is $162, giving $1,962. Example 4 is the trap. A 2.8% increase looks modest and would fit the Washington percentage formula, but if the tenancy is still in its first 12 months, HB 1217 bars any increase at all. Percentage alone never answers the legal question.

Two increases in one 12-month period

Suppose a California tenant pays $2,000, is raised to $2,080 in January (4%), then to $2,160 in July (a further $80). Together the rent has risen $160 on a $2,000 base — 8% in one 12-month period. If CPI is 3%, the cap is also 8%, so the combined rise sits exactly at the cap; if CPI were 2%, the cap would be 7% ($140) and the $160 rise would be $20 over. Add increases together across the cap period, keep every notice, and for Washington's period rule check the official source rather than assuming California's framing carries over.

How to read your increase notice

Read the notice line by line before doing any arithmetic. A notice that fails on its own terms cannot be saved by a correct percentage, and a notice with a correct percentage can still be defective if its dates or figures are wrong. Check each item below against your lease and your payment records, and note anything that does not match.

Worked check: a notice says old rent $1,950, new rent $2,100, increase 7.7%, but your records show you pay $1,900. On the true base the increase is $200, about 10.5% of $1,900 — a correction that can move an increase from inside a cap to outside it. Point out each discrepancy separately in writing.

Common mistakes that make a lawful check go wrong

Using a national inflation headline as CPI. The formula needs the CPI figure the statute or ordinance specifies. A national rate you saw in the news may differ from the local figure, and a difference of one percentage point on $2,000 rent is $20 a month, or $240 a year. Always note the CPI figure and where you found it.

Working the percentage out on the new rent. The increase is a percentage of the old rent. On a rise from $2,000 to $2,200, the increase is $200 divided by $2,000, which is 10%, not $200 divided by $2,200, which is about 9.1%. The wrong base can make an over-cap increase look lawful.

Counting from the letter date instead of the effective date. A notice posted in month 11 but effective in month 13 raises different timing questions from one effective in month 11. Check the official source for how notice and effective dates interact in your jurisdiction, and record both dates.

Assuming an exempt property has no protection. A property outside a state cap may still be covered by a city ordinance, and a property inside the state cap may face a stricter city cap. Coverage must be checked at both levels.

Treating a calculator result as a ruling. A calculator checks arithmetic only. It cannot confirm coverage, the correct CPI input, notice validity, or a city ordinance.

What this check does not tell you

Four questions stay open after this check: whether your property is covered by AB 1482 or HB 1217, what notice period your jurisdiction requires, whether your lease restricts increases, and what a city ordinance says about your home. It does not cover other states, nor does it decide whether an increase is retaliatory or discriminatory — for those, Check official source and seek qualified advice if needed. A lawful but unaffordable increase is a negotiation question, not a cap question.

Sources

• California AB 1482, Civil Code 1947.12 — maximum increase min(5% + CPI, 10%) per 12 months for covered properties.
• Washington HB 1217, RCW 59.18.700 — maximum increase min(7% + CPI, 10%); no increase in the first 12 months.
• For all other states, and for city ordinances, notice rules, coverage, and exemptions: Check official source — the state legislature's or city's official site and housing department pages.

Related tool: Rent Increase Percentage Calculator — work out the percentage of a proposed increase before you check it against a cap.

Frequently asked questions

Does a rent cap stop all increases?

No. Caps limit the size of an increase over a period; they do not freeze rent. Exemptions and local rules also matter.

Can my landlord raise rent twice in a year?

It depends on the cap’s period and your jurisdiction. Under a per-12-months cap, two increases in one period must be assessed together.

What if my city cap is lower than the state cap?

City ordinances may be stricter and may override state rules. Check the official source for your city.

How do I work out the percentage increase?

Subtract the old rent from the new rent, divide the difference by the old rent, and multiply by 100. For $2,000 rising to $2,160, that is $160 divided by $2,000, which is 8%.

Is the percentage worked out on the old rent or the new rent?

On the old rent. Using the new rent as the base understates the percentage and can make an over-cap increase look lawful.

What if the increase is exactly at the cap?

An increase exactly at the cap fits the state formula, but timing, notice, coverage, and city rules still have to be checked before it can be treated as lawful.

What if I receive two increases in one 12-month period in California?

Add them together on the original base and compare the combined rise with the cap for the period. Judging the second increase alone can hide a breach.

Does the cap change if I renew my lease or move to month-to-month?

Check the official source and your lease. This guide does not state a separate cap for renewals or month-to-month tenancies, so do not assume the answer is the same without checking.

What should I keep if I dispute an increase?

Keep the notice, the envelope or delivery record, your lease, rent payment records, your cap calculation with the CPI source, and every written exchange with the landlord.

Same warning as above: this is general information, not legal advice — check the official source for your city and state.

Last updated: 2026-10-25. Last verified for state rules: 2026-10-25.