ESA Letter Requirements: What Your Letter Must Include
A valid ESA letter must meet specific standards established by the Fair Housing Act. Missing any required element — or including prohibited content — can result in your letter being rejected by a landlord or property manager.
What the Fair Housing Act Requires
The Fair Housing Act does not prescribe an exact letter format, but establishes what housing providers can reasonably request. Documentation must come from a licensed healthcare professional and must confirm two things: (1) that the individual has a disability under the FHA's definition, and (2) that the individual has a disability-related need for the emotional support animal.
The FHA defines disability broadly — any physical or mental impairment that substantially limits one or more major life activities. Mental health conditions including anxiety, depression, PTSD, ADHD, OCD, bipolar disorder, and many others qualify.
The clinician must hold an active, valid professional license and must have conducted a genuine evaluation — not just signed a form. Housing providers may reject documentation from services where no real clinical evaluation occurred.
Note on evolving federal guidance: HUD's 2020 assistance animal guidance was withdrawn in 2025. The Fair Housing Act's reasonable accommodation requirements remain in effect, but federal enforcement standards are currently less standardized than they were under that guidance. ESA holders should be aware that outcomes may vary by jurisdiction and housing provider.
8 Things a Valid ESA Letter Must Include
The clinician's full legal name and professional title (LMFT, LPC, LCSW, Ph.D., etc.)
Must match the name on their state license
The clinician's active license number and issuing state
Landlords are entitled to verify this with the state licensing board
Professional letterhead with contact information
Phone, email, or mailing address so the landlord can reach the clinician if needed
Date of the letter and the date of the clinical evaluation
The evaluation date confirms a real consultation took place
A statement that the client has a disability under the Fair Housing Act definition
Does not require naming the diagnosis — just confirming disability status
A statement of disability-related need for the specific emotional support animal
The letter must connect the ESA to the functional limitation it addresses
The clinician's original signature (wet ink or secure digital)
An unsigned letter or stamped signature may be challenged
The type of animal (species) for which accommodation is requested
Breed is not required, but species (dog, cat, etc.) should be specified
6 Red Flags That Make a Letter Invalid
The following elements are not only unnecessary — they are signals that the letter may be fraudulent and will likely be rejected by an informed landlord or property manager:
Automatic approval with no real consultation
Any letter produced without a live clinician evaluation is legally indefensible
An ESA 'registration number' or 'certificate'
There is no official ESA registry in the U.S. — these are meaningless and often associated with scams
A specific diagnosis or detailed medical history
Disclosing your diagnosis to a landlord is not required and weakens your privacy protections
Claims the animal is 'certified' or 'trained'
ESAs require no training or certification — stating this suggests the letter was auto-generated
An airline accommodation claim
Airlines have not been required to accommodate ESAs since January 2021 — including this shows the letter is outdated
An expiration date longer than 12 months or 'lifetime' validity
No legitimate clinical document is valid indefinitely — landlords can rightfully question these
What Landlords Can and Cannot Request
Under HUD guidance, landlords may request documentation confirming disability and disability-related need. This is where their authority ends.
Landlords MAY request
- An ESA letter from a licensed mental health professional
- Verification of the clinician's active state license
- That the letter be issued within the past 12 months
- A written reasonable accommodation request form
Landlords CANNOT request
- Your specific diagnosis or medical records
- Proof that the animal is trained or certified
- Information about the severity of your disability
- Access to your mental health treatment history
- The animal to wear a vest or identifying marker
Requesting any item from the "cannot" list is a Fair Housing Act violation. If your landlord demands this information, you can file a complaint with HUD's Office of Fair Housing and Equal Opportunity at HUD.gov/fairhousing.
Does the Clinician Need to Be Licensed in My State?
Yes — and this matters more than most people realize. State licensing boards govern clinician practice within their borders. A clinician who signs an ESA letter must hold an active, valid license in the state where the client resides to be in compliance with state law.
More practically: landlords are increasingly sophisticated about checking clinician credentials. A letter from a clinician who is not licensed in your state is easier to challenge and more likely to be rejected. Every ESA Letter Online evaluation is matched with a clinician who holds an active license specifically in your state of residence.
How Long Is an ESA Letter Valid?
There is no federal law specifying an expiration date for ESA letters. However, HUD guidance allows housing providers to request updated documentation if there is reason to believe circumstances have changed. In practice, most landlords and property managers treat ESA letters as valid for 12 months from the date of issue.
We recommend renewing annually. Our platform sends a renewal reminder 60 days before your letter expires so you're never caught without documentation at a critical moment — like when applying for a new lease.