HOA Blocking Your ADU or Guest Unit? Know the New Laws in Colorado

You've been dreaming about adding an accessory dwelling unit — maybe a small backyard cottage for your aging parent, a rental unit to help cover the mortgage, or a comfortable space for guests — and now your HOA is saying no. Or maybe you've already started the process and received a notice claiming your ADU violates community rules. Either way, you're probably frustrated and wondering whether your HOA actually has the legal authority to block this kind of project. That frustration is completely understandable. The rules around ADUs have been shifting across the country, and Colorado has made some meaningful moves to protect homeowners' rights in this space. Before you accept your HOA's position as the final word, it's worth understanding what state law generally says about this issue and what practical steps you might be able to take.

What State Law Generally Says

Colorado's primary statute governing homeowner associations is the Colorado Common Interest Ownership Act (CCIOA), codified at C.R.S. §38-33.3. This law sets a broad framework for how HOAs are formed, how they operate, and — critically — how far their authority actually extends over individual homeowners. One of the foundational principles embedded in CCIOA is that HOA rules and restrictions must be enforced uniformly and in good faith, as described under C.R.S. §38-33.3-302. That means an HOA generally cannot selectively apply restrictions to some homeowners while ignoring the same conduct from others. If your association has historically allowed certain property modifications but is suddenly drawing the line at ADUs, that pattern of enforcement may be worth examining closely. You can read more about the general scope of association authority in our guide on what your HOA can and cannot do.

Beyond the uniform enforcement principle, Colorado has taken legislative steps in recent years to limit local and private restrictions on accessory dwelling units as a response to the state's housing shortage. While HOA governing documents — including declarations and bylaws — can still place conditions on construction and design, the question of whether a blanket prohibition on ADUs is enforceable under current Colorado law is increasingly complicated. If your HOA is citing a restriction in its CC&Rs that appears to conflict with state housing policy or with CCIOA's good-faith enforcement standards, that tension is worth raising in writing. The statute text suggests that restrictions must be reasonable and consistently applied — meaning a flat ban without factual basis specific to your property or unit type may not comply with current statutory expectations.

On the fine and violation side, C.R.S. §38-33.3-209.5 and §38-33.3-302(1)(a) together generally require that an HOA provide written notice of any alleged violation and give the homeowner a 30-day opportunity to cure before imposing a fine. Fines must also be reasonable and proportionate — not arbitrary. If you've received a violation notice related to an ADU project and your HOA skipped the cure period or failed to provide written notice in the format the statute appears to require, those procedural gaps may be relevant to any response you draft. Understanding the difference between a procedurally sound HOA action and one that appears to fall short of statutory requirements is a key starting point, and our overview of how to appeal an HOA fine walks through that process in more detail.

Steps a Homeowner Can Consider

1. Pull and Read Your Governing Documents Carefully

Before doing anything else, you may want to gather your HOA's full set of governing documents — the Declaration of Covenants, Conditions & Restrictions (CC&Rs), bylaws, and any architectural or design guidelines. Look specifically for language about accessory structures, guest units, rental restrictions, or construction approval processes. Pay attention to how those terms are defined, because broad language like "no additional structures" may have been written decades before ADUs became a recognized housing category. Note the date the documents were recorded, and look for any amendment history. Understanding exactly what the governing documents say — versus what the HOA board is claiming they say — is a foundational step.

2. Request the HOA's Records in Writing

Under C.R.S. §38-33.3-317, homeowners generally have the right to request association records, and the HOA is typically required to respond within 10 business days — with a 2025 update requiring document delivery within 7 business days in many cases. Consider submitting a written records request — sent via certified mail with return receipt — asking for meeting minutes related to ADU policy decisions, any architectural committee guidelines, and records of how similar requests from other homeowners have been handled in the past. Having documentation of how the HOA has treated comparable requests can be useful context if you need to make the case that enforcement is inconsistent.

3. Document Everything About Your Situation

Homeowners often find it helpful to keep a running log of every interaction with their HOA about this issue. Note the date, method of communication, and a summary of what was said or written. Save every letter, email, and text. If the HOA has pointed to a specific rule or CC&R provision, write that down verbatim and note where it appears in the governing documents. If neighbors have made similar modifications without receiving violations, photograph those structures and note their addresses. A clear, organized record of facts makes any letter you send — and any escalation you pursue — significantly more credible.

4. Send a Written Response Referencing the Statute

If you've received a violation notice or a denial of your ADU application, you may want to send a written response that references the relevant statutes. A letter that cites C.R.S. §38-33.3-302 and asks the HOA to explain the specific governing document provision being applied, how that provision has been applied to other homeowners, and whether the 30-day cure period was properly observed puts your concerns on the record formally. Written responses sent by certified mail create a paper trail and signal that you are taking the matter seriously. Framing your letter around factual questions and statutory references — rather than accusations — tends to produce more substantive replies.

5. File a Complaint with the State's HOA Oversight Office

Colorado homeowners have access to a dedicated state resource: the Colorado HOA Information and Resource Center, operated through the Division of Real Estate within the Department of Regulatory Agencies (DORA). This office handles complaints about HOA conduct and can provide information about your rights under CCIOA. Filing a complaint does not guarantee a specific outcome, but it does create an official record and may prompt the HOA to reconsider its position. For smaller disputes involving quantifiable damages, Colorado Small Claims Court handles claims up to $7,500 and is designed to be navigable without an attorney, though the specifics of your situation would determine whether that's a realistic path.

When to Talk to a Licensed Attorney

Self-help tools and statute research can take you a long way in an HOA dispute, but there are situations that genuinely call for professional legal guidance. If your HOA has threatened to place a lien on your property, initiated foreclosure proceedings, or served you with legal documents as part of a formal lawsuit, those are time-sensitive situations where the stakes are high enough that consulting a licensed Colorado attorney is strongly advisable. The same applies if you believe your HOA is retaliating against you for a previous complaint, or if you think the restriction being applied to your ADU may constitute a fair housing violation based on disability accommodation needs or familial status — those are areas with specific federal and state protections that go well beyond general HOA law.

Large financial exposure — whether from accumulated fines, construction costs already incurred, or potential damages — is another signal that self-help alone may not be sufficient. An attorney who handles HOA or real estate matters in Colorado can review your specific governing documents, assess whether the HOA's position appears to conflict with CCIOA or other applicable law, and advise you on your actual options. Knowing when a situation has grown beyond a letter-writing exercise is part of being a practical and informed homeowner. For a broader look at how