Emotional Support Animal (ESA) Letters & Laws in Colorado

Colorado did the thing no other state did

When the federal housing agency withdrew its assistance-animal guidance, the documents landlords and tenants had leaned on for years stopped being current. Most states carried on and argued about what was left. Colorado passed a law.

House Bill 26-1045 was signed on May 19, 2026 and takes effect on August 12, 2026. Its legislative declaration is unusually blunt about why it exists: the general assembly found that recent federal policy changes, including the rescission of guidance that had helped both sides understand their rights, created confusion and inconsistent interpretation, and stated that the purpose of the act is to restore the rescinded federal guidance by codifying it in state law. No other state covered in these guides has done that.

Three presumptions, and what each one is for

The act adds a definition of “assistance animal” to C.R.S. § 24-34-301(2.5): an animal that does work, performs tasks, assists, or provides therapeutic emotional support to a person with a disability. The section then says the term includes an emotional support animal and a service animal — ending a long-running argument in one line.

Then come the presumptions, added to C.R.S. § 24-34-502.2(2)(b)(II):

“Permitting an assistance animal in housing is presumed to be a reasonable accommodation, so long as a housing provider has been given an opportunity to engage in an interactive accommodation process with the individual requesting the accommodation.”

And immediately after it, the mirror image: the complete prohibition of assistance animals in housing is presumed to be discriminatory.

Read those two together and the burden has moved. Before the act, a tenant argued that allowing the animal would be reasonable. From August 12, 2026, allowing it is where the analysis starts, and a landlord who wants a different answer has to displace a statutory presumption. A lease clause banning all animals with no exception process stops being a defence and starts being evidence.

The condition attached to the first presumption matters as much. It applies where the landlord “has been given an opportunity to engage in an interactive accommodation process”, which a tenant who moves an animal in and argues afterwards has not done.

The clause that protects the landlord, and why it helps you

Colorado did not write a one-sided statute, and the part that runs the other way tells you exactly what to prepare.

C.R.S. § 24-34-502.2(2)(b)(II)(C) provides that a housing provider does not commit a discriminatory housing practice solely by requesting reasonable documentation supporting the claim of disability or the disability-related need, or by engaging in a good faith interactive process, unless the disability or the need is obvious.

So “can they ask me for paperwork?” now has a written Colorado answer, and for most renters it is yes. What they may ask about is bounded, though: the disability and the need. Not breed, training, weight, or a number from a website.

A separate provision draws the line on behaviour. Under C.R.S. § 24-34-502(1)(a)(III), the mere presence of an assistance animal is not a direct threat and is not presumed to damage property, though a provider may consider documented, specific conduct that is. Those two words rule out the objections tenants hear most: a neighbour who dislikes animals, and a policy about a breed.

Every landlord in Colorado, not only the large ones

The federal Fair Housing Act does not reach owner-occupied buildings of four units or fewer. Colorado’s law does, and the Civil Rights Division says so in terms on its own housing page.

The exemptions written into C.R.S. § 24-34-502 are real but they miss disability entirely. The carve-out for a landlord with three or fewer units applies only to the source-of-income rules; the others cover religious organisations, genuine private clubs, occupancy limits and housing designed for older persons. The owner of one duplex in Pueblo and the manager of eight hundred units in Aurora owe the same duty under C.R.S. § 24-34-502.2(2)(b), and answer to the same agency.

Colorado tells your provider what to do, and the rule is not the same for everyone

Since 2016, Colorado has regulated the person who writes the documentation, not just the tenant who presents it.

A licensee approached by a patient seeking an assistance animal as a housing accommodation must make a written finding on whether the patient has a disability, and a separate written finding on whether the need for the animal relates to it, or a finding that there is not enough information to say. They may not decide unless they are sufficiently familiar with the patient and the disability, are legally and professionally qualified, and have met the patient.

The meeting requirement is where Colorado splits, and the difference is easy to get wrong. C.R.S. § 12-240-144(3)(a), governing physicians, permits a meeting in person or by telemedicine. C.R.S. § 12-245-229(3)(a), governing mental health professionals (psychologists, counsellors, social workers, marriage and family therapists) says in person, full stop. Since most emotional support animal documentation comes from a mental health provider, the stricter rule is usually the operative one.

Warned first, then fined

C.R.S. § 18-13-107.3 makes it an offence to intentionally misrepresent entitlement to an assistance animal to obtain a housing accommodation, and its elements are stricter than most states’. The person must know the animal does not qualify or that they have no disability, and. The unusual limb, must previously have been given a written or verbal warning that misrepresentation is illegal. Senate Bill 21-271 reclassified it as a class 2 civil infraction for conduct on or after March 1, 2022, with fines of twenty-five dollars, then fifty to two hundred, then one hundred to five hundred.

The statute then closes the loop with the licensing rules. A written finding made under C.R.S. § 12-240-144(1)(a) or § 12-245-229(1)(a) is an affirmative defence, and the absence of one is expressly not proof of the offence. A genuine assessment is the document Colorado law itself points to.

The money

Colorado caps what a pet costs. C.R.S. § 38-12-106, in force since January 1, 2024, limits an additional pet deposit to three hundred refundable dollars, and pet rent to thirty-five dollars a month or one and one-half percent of the rent, whichever is greater, so above roughly two thousand three hundred dollars of rent, the percentage governs.

None of that should reach an approved assistance animal, because waiving a pet charge is an exception to a policy, which is what C.R.S. § 24-34-501(3.5) now defines a reasonable accommodation to be.

The same 2023 act removed the excuse landlords most often give for a breed restriction. C.R.S. § 10-4-110.8(16) bars an insurer from refusing a homeowner’s or dwelling fire policy, or raising its premium, over a dog’s breed, and from asking about breed at all except whether the dog has been declared dangerous. “My insurance won’t allow it” is no longer a lawful answer in Colorado.

Your deposit, under a statute rewritten last year

HB25-1249 rewrote C.R.S. § 38-12-103 with effect from January 1, 2026, and it runs hard in the tenant’s favour. The deposit comes back within thirty days, or up to sixty if the lease says so, and money may be kept only for unpaid rent, unpaid utilities, other lawful charges named in the lease, and repair of damage exceeding normal wear and tear that did not already exist.

Three provisions matter most to a tenant with an animal. The landlord carries the burden of proving both that the withholding was not wrongful and what the actual damages were. Retaining one hundred twenty-five percent or more of actual damages is presumed unreasonable. And carpet (which is what animal-damage deductions are almost always written against), cannot be treated as substantially and irreparably damaged if it was not replaced with new carpet in the ten years before the tenancy ended.

On written request the landlord has fourteen days to produce the photographs, inspection reports, receipts, invoices or estimates behind the charge, and either side may ask for a walk-through before the tenancy ends. Wrongful retention costs treble damages plus attorney fees and court costs, after seven days’ written notice of intent to sue.

One year, and intake is not filing

Complaints go to the Colorado Civil Rights Division, which has been enforcing state fair housing law since 1959, Colorado passed the country’s first, nine years ahead of the federal Act.

C.R.S. § 24-34-504(1) gives one year from the unfair housing practice. Employment complaints get 300 days and public accommodation complaints only 60, so housing has the generous window, but the Division states plainly that it cannot extend it for any reason.

The trap is procedural. Submitting intake through the Division’s CaseConnect system is not filing a charge; the charge is drafted and signed afterwards, so a tenant who starts intake at day 360 has preserved nothing. Because the Division is a HUD-certified Fair Housing Assistance Program agency, most housing cases are then dual-filed under both a state and a federal number.

Where Colorado’s renters are

Statewide, a third of households rent, 33.8% on the 2020-2024 American Community Survey five-year estimate. Where those renters live is the part that matters. Boulder and Denver are majority-renter cities. Centennial is not, and neither is Castle Rock, where fewer than one household in four rents at all.

That gap decides who reads your request. A large Denver leasing office has handled hundreds and has a written process. An owner letting a single Castle Rock house may be reading their first. The duty under C.R.S. § 24-34-502.2(2)(b) is identical; the conversation is not, and the second one needs a clearer letter.

What to do about it

Ask before the animal arrives, and ask in writing, because the presumption in C.R.S. § 24-34-502.2(2)(b)(II)(A) depends on the landlord having had a chance to engage. Expect a documentation request, since Colorado law now says asking is not discrimination unless your need is obvious. Have that documentation come from a licensed professional who assessed you: in person, if they are a mental health provider, because that is what C.R.S. § 12-245-229(3)(a) requires and what the statute treats as the answer to a misrepresentation charge.

If the answer is a flat no, or a pet deposit demanded on an approved assistance animal, the deadline is one year and the agency is the Colorado Civil Rights Division.