“Your ESA letter expires after one year” is one of the most repeated sentences on the internet, and it is repeated so confidently that most people assume it is in a statute somewhere. It is not. Understanding what the twelve-month figure actually is changes when you should act on it — and stops you paying for a renewal you did not need while missing the one you did.
Does an ESA letter actually expire?
There is no federal expiry date
Nothing in the Fair Housing Act (42 U.S.C. §3604(f)) or its regulations sets a validity period for assistance-animal documentation. No federal rule says a letter stops working on its first birthday, and no federal agency issues or revokes one.
What does exist is an entitlement on the other side: where a disability or the need for an animal is not obvious, a housing provider may ask for reliable information supporting both. Information about a current need is what that means in practice — and that is the whole of the twelve-month story.
So the honest answer to “has my letter expired?” is: it has not stopped existing, but after a year or so a housing provider can reasonably ask for something newer, and you have no good answer if you do not have one. Treat the date as the point at which a request becomes likely, not as a deadline that voids your documentation.
Where the twelve-month convention comes from
Three things converged on the same number, none of them a federal expiry date.
Property-management practice
Leasing software audits assistance-animal files on a cycle, and that cycle is usually annual because leases are usually annual. A file with documentation older than the current lease term flags for review. This is the main reason the number is twelve.
Evidence of a current need
Mental health is not static. Symptoms fluctuate, remit and change. Documentation from several years ago describes a person's situation at that time, and a housing provider reviewing it now is entitled to ask whether it still holds. A recent letter closes that argument before it starts.
One state that really does require it
Arkansas turns the convention into a duty — but on the clinician, not on you. Under Ark. Code Ann. §20-14-1003, a health care provider issuing emotional support animal documentation must complete a clinical evaluation of the individual at least once each year and review the need before renewing the documentation. If you are in Arkansas, annual renewal is not a landlord preference; it is how your provider is permitted to keep the documentation in place.
Five events that should trigger a renewal
Rather than watching a date, watch for these. Each one is a moment when someone is about to look at your documentation properly.
- 1Your lease is coming up for renewal. This is the single most common audit point. Arriving with current documentation is far easier than responding to a request with a deadline attached.
- 2You are applying for a new home. A new property manager scrutinises documentation far more closely than one who approved it two years ago. A recently dated letter removes an easy reason to delay your application.
- 3You are moving to another state. The most important trigger, and the one covered below.
- 4Your letter is missing something. If you look at it now and cannot find a licence number, a state of licensure, or a sentence linking the animal to your disability, renewal is the fix — not an argument with a property manager. The full list of gaps takes two minutes to check against.
- 5Your circumstances or your animal have changed. A second animal, a different animal, or a materially different clinical picture all need documentation that describes what is true now.
State rules that change your lead time
A renewal is not instant anywhere, and in three states it cannot be. These rules bind the clinician, so they are not something a service can work around.
| State | What the statute requires | Lead time to plan for |
|---|---|---|
| California | Health & Safety Code §122318: active California licence, a client relationship of at least 30 days, a clinical evaluation, and written notice that an ESA does not carry service-dog public access. | At least 30 days if you are starting with a new clinician. |
| Montana | Mont. Code Ann. §70-24-114: a client-provider relationship of at least 30 days, a clinical evaluation, and the licence number, type and effective date on the document. | At least 30 days with a new clinician. |
| Arkansas | Ark. Code Ann. §20-14-1003: a 30-day client-provider relationship, a clinical evaluation at least annually, and a review of the need before renewing. | At least 30 days, and plan on an annual evaluation regardless. |
| Florida | Fla. Stat. §760.27: supporting information from a health care practitioner, telehealth provider or similarly licensed practitioner in good standing — an out-of-state practitioner only if they have provided in-person care on at least one occasion. | No fixed wait, but an out-of-state clinician who has never seen you in person will not qualify. |
Moving to a new state
People are often told that crossing a state line instantly voids their letter. That is not quite it. The document does not self-destruct; what changes is that the clinician who wrote it may no longer be licensed where you now live, and clinical licensure is state-based. A new housing provider will notice, and some states make the point explicitly — Florida accepts documentation from an out-of-state practitioner only where that practitioner has provided in-person care on at least one occasion.
The practical answer is therefore the same as if it did expire: establish care with a clinician licensed in your new state and get documentation from them, and start that before the move if your new state has a 30-day rule. Our state-by-state ESA guides set out what each one expects.
What happens if documentation goes stale
Nothing happens automatically. No alarm goes off, and no landlord is notified. What you lose is the easy answer to a question that eventually gets asked.
- In a building with a pet policy, a housing provider who asks for current documentation and does not receive it may start treating the animal as a pet — which means a pet deposit and monthly pet rent at whatever the local market rate is.
- In a no-pets building, the same gap can produce a notice to cure or quit. That is a lease-compliance process, and it runs on its own timetable regardless of how strong your underlying case is.
- Fees charged while your documentation was out of date are generally not refunded once you produce a new letter. The exemption is not usually applied retrospectively.
- Breed and size restrictions the building applies to pets can come back into play for the same reason.
None of this is a reason to panic about a letter that is thirteen months old. It is a reason to renew before the request arrives rather than after, because the argument is slower and more expensive than the appointment.
2025–2026 federal ESA policy timeline
- September 17, 2025: HUD withdrew guidance documents FHEO-2020-01 and FHEO-2013-01, removing the documentation framework landlords and tenants had relied on for a decade.
- May 22, 2026: HUD issued an enforcement memorandum directing its Office of Fair Housing and Equal Opportunity to find reasonable cause only where an animal is individually trained to perform work or tasks related to the complainant's disability — the standard the ADA applies to service animals.
- What did NOT change: the Fair Housing Act itself (42 U.S.C. §3604(f)) and its regulations, your right to bring a private FHA suit, and state and local fair-housing laws, which the memorandum expressly leaves alone.
One thing the 2026 enforcement change does affect: if a dispute does arise, the useful first stop is now more often a state or local fair-housing agency than a federal complaint, because HUD's enforcement office said it will find reasonable cause only where an animal is individually trained for disability-related tasks. Strong, current documentation and your own state's rules are doing more of the work than they were. The detail is in our 2026 HUD guidance explainer.
How the renewal itself works
A renewal is a fresh evaluation, not a reprint. A clinician licensed in your state assesses whether the need is current and issues new documentation dated today. It does not have to be the same clinician who wrote the original — any clinician licensed in your state, working within their scope of practice, can do it.
The step-by-step version, including what to send your landlord afterwards, is in how to renew your ESA letter and on our renewal page. When the new letter arrives, submit it the same way you submitted the first one — in writing, with a date you can point at later: how to request an ESA accommodation has wording you can reuse for a renewal.
Sources & further reading
- Fair Housing Act, 42 U.S.C. §3604(f) — no validity period is prescribed anywhere in it
- Ark. Code Ann. §20-14-1003 — 30-day relationship, annual clinical evaluation, annual review before renewal
- Cal. Health & Safety Code §122318 (AB 468); Mont. Code Ann. §70-24-114
- Fla. Stat. §760.27 — supporting information and the out-of-state in-person requirement
- HUD FHEO — withdrawal of Notices FHEO-2020-01 and FHEO-2013-01 (September 17, 2025) and the assistance-animal enforcement memorandum (May 22, 2026)