Colorado Assistance Animal Accommodation Law 2026

HB26-1045 states directly that permitting an assistance animal in housing is a reasonable accommodation, once the housing provider has had the opportunity to engage in the interactive accommodation process. This is a meaningful shift in how these requests get evaluated: rather than a landlord weighing whether to grant the request from a neutral starting point, the law puts a thumb on the scale toward granting it.

[Cite: HB26-1045, amending Colorado Revised Statutes section 24-34-501]

The presumption isn't absolute, but it's genuinely hard to overcome. A landlord can rebut it only by showing documented, specific conduct establishing that the animal poses a direct threat to the health or safety of others, or causes substantial physical damage to property. Critically, the statute specifies that the animal's mere presence doesn't create a presumption of threat or damage on its own; a landlord needs actual evidence of specific conduct, not a generalized concern about having an animal in the unit.

[Cite: HB26-1045, amending Colorado Revised Statutes section 24-34-501]

This puts real weight on documentation. A landlord who wants to deny a request or later remove an animal based on conduct needs to be able to point to specific, documented incidents, not a general impression that the animal seems like it could be a problem.

Before this presumption fully applies, the law requires a landlord to engage in a good faith interactive process to evaluate the request, unless the disability or disability-related need is obvious. As part of that process, a landlord may request reasonable documentation supporting the need for the animal.

[Cite: HB26-1045, amending Colorado Revised Statutes section 24-34-501]

The statute doesn't spell out a detailed, step-by-step procedure for what this process has to look like. What it does make clear is that a documentation request can't be used as a tool to deny a legitimate accommodation request; the interactive process exists to evaluate the request, not to create obstacles that discourage or defeat it.

HB26-1045 adds specific definitions to the Colorado Anti-Discrimination Act. An assistance animal is defined as an animal that does work, performs tasks, assists, or provides therapeutic emotional support to an individual with a disability. An emotional support animal is defined more narrowly, as an animal that provides solely emotional support to alleviate a symptom or effect of a disability.

[Cite: HB26-1045, amending Colorado Revised Statutes section 24-34-301]

Having these definitions written into statute matters because it removes ambiguity about which animals the accommodation framework, and its presumption of reasonableness, actually covers. A landlord evaluating a request can check it against these specific statutory categories rather than relying on an informal or inconsistent understanding of what counts.

Before this law, a landlord evaluating an assistance animal request was weighing the request against Colorado's general reasonable accommodation standard without a specific statutory presumption favoring approval. Now, a landlord considering denial needs to be prepared to document specific conduct that meets the direct-threat or substantial-property-damage standard, rather than relying on a general policy against animals, breed or size concerns without documented incidents, or a preference not to deal with the accommodation.

A landlord who already has a solid process for the interactive dialogue, requesting reasonable documentation when a need isn't obvious, evaluating requests in good faith, and documenting any actual problematic conduct rather than assuming it, is likely already positioned well under this framework. A landlord relying on informal denials or blanket no-pets enforcement against assistance animal requests is the one most exposed by this change.

The August 12, 2026 effective date described throughout this article applied unless the law became subject to a referendum petition, in which case its effect would instead have depended on approval at the November 2026 election. I found no indication that a referendum petition affected this law, and it's treated throughout this article as being in force on its stated effective date, but property managers working from older sources should confirm they're not looking at outdated information predating that date.

[Cite: HB26-1045, 2026 Colorado Session Laws]

Colorado's presumption operates alongside, not instead of, federal fair housing protections for assistance animals, which already require housing providers to grant reasonable accommodation requests for animals that meet the federal standard, subject to similar direct-threat and property-damage exceptions. HB26-1045 adds a specific state-law presumption and Colorado-specific definitions on top of that existing federal framework, rather than replacing it. A landlord operating in Colorado needs to satisfy both frameworks, and the state presumption generally makes the accommodation request harder to deny than relying on federal standards alone might suggest.

The statute uses the phrase "reasonable documentation" without listing out every acceptable form it could take. In practice, and consistent with how this kind of accommodation documentation is generally handled under the broader disability accommodation framework, this typically means something that establishes the disability-related need for the animal, such as a statement from a healthcare or other qualified professional, rather than a demand for full medical records or a specific diagnosis. The point of the documentation request is to establish that a genuine disability-related need exists, not to interrogate the underlying medical condition itself.

[Cite: HB26-1045, amending Colorado Revised Statutes section 24-34-501]

A landlord asking for more than what's reasonably needed to establish the disability-related need risks the request itself looking like an obstacle to the accommodation rather than a legitimate part of the interactive process, particularly given how strong the underlying presumption in favor of the accommodation now is.