Explained in plain words
There is no national answer, and any page that gives you one is guessing. Four states cap lot rent statewide, each in a completely different shape; a handful regulate the process hard without capping the amount; and in the rest, the protection is the notice period, your lease, and — in California's case — about 102 local ordinances. Here is the map, state structure by state structure.
Washington: a flat 5% in any 12-month period, no increase in the first 12 months of a tenancy, 90 days' notice — with lot-specific exemptions (public and nonprofit affordable housing, a one-time increase at the first renewal after a home sells, a post-sale preservation increase the owners approve). The notice must state the facts behind any exemption the park claims.
Oregon (HB 3054): parks over 30 spaces, 6% flat; 30 or fewer, the lesser of 10% or 7% + CPI; 90 days' notice; an infrastructure exception up to 12% with majority tenant approval. Beware older pages still printing the superseded '7% + CPI for everyone' rule — the state's own agency pages replaced it.
New Jersey: a 3.5% statewide cap (P.L. 2025, c. 85) with a hardship exception. New York: 3% by default under RPL § 233-B, with a justified-excess process a resident can challenge inside a 90-day window.
Florida caps nothing but regulates the process: 90 days' notice, a meeting with a homeowner committee, mediation, and a court — not the state agency — deciding whether an amount is unreasonable. California caps nothing statewide; the state Senate's own FAQ calls it a local control issue and counts about 102 local ordinances, with long-term leases exempt from them. Georgia and Tennessee go further the other way: state law bars cities and counties from capping rent at all. The checker returns your state's real answer — cap math where a cap exists, the honest no-cap answer where it does not — and always tests your notice period.
Our checker will never tell you an increase 'is illegal.' It will tell you the cap is X with these exemptions, your numbers put you inside or outside it, and here is the dispute path: object in writing before the effective date, demand the exemption facts in writing, and take the notice and lease to legal aid. That framing is deliberate — it is the strongest true statement the math supports.
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General information about how the process works in your state — not legal advice. For a contested eviction, a park-sale fight, or a title dispute with a lienholder, a local attorney or legal-aid office is the next step.