Colorado HOA ADUs & Modifications

Key Findings

• Start with the core rule. A Colorado declaration cannot override the protections in C.R.S. § 38-33.3-106.5, because § 38-33.3-104 says the rights CCIOA grants cannot be waived or varied by agreement. In every protected category the line falls in the same place: an association may not effectively prohibit the modification, but it may reasonably regulate it.
• Colorado reaches ADUs more narrowly than California does. California Civil Code § 4751 voids ADU-prohibiting covenants statewide for single-family lots. Colorado reaches only "subject jurisdictions."
• The courts have not weighed in directly. No Colorado appellate opinion in the past 36 months squarely decides HOA architectural control, the protected-modifications section, solar, EV charging, landscaping, signs, or ADUs. The two closest recent CCIOA rulings turn on pre-CCIOA community formation and premises liability, not architectural authority.
• Do not expect the state to referee. The HOA Information and Resource Center inside the Colorado Division of Real Estate registers associations and hands out information, but it does not mediate, arbitrate, give legal advice, or decide architectural disputes.

Details

Colorado's Common Interest Ownership Act (CCIOA) tells a homeowners association what it cannot forbid. The list runs long: solar and other renewable energy generation devices, electric vehicle (EV) charging systems, xeriscape and nonvegetative turf landscaping, signs, flags, and fire-hardened building materials. On top of that, the state's 2024 accessory dwelling unit (ADU) law reaches into HOA covenants within defined "subject jurisdictions."¹ CCIOA, codified at C.R.S. §§ 38-33.3-101 et seq., governs every common interest community, though some provisions apply only to communities created on or after July 1, 1992; for communities formed before that date, the older Colorado Condominium Ownership Act, C.R.S. §§ 38-33-101 et seq., still recognizes condominium ownership.² The central provision, C.R.S. § 38-33.3-106.5, names the categories of modification and expression an association cannot ban outright — while leaving the association free to impose reasonable, content-neutral regulation on each.¹ House Bill 24-1152 (C.R.S. §§ 29-35-401 to 405) supplies the ADU reach: inside a subject jurisdiction, it voids any covenant provision that prohibits an ADU as an accessory use to a single-unit detached dwelling. Outside one, the recorded covenants (CC&Rs) may still control.³ A separate layer of federal law binds every Colorado association no matter what the state framework says: the Freedom to Display the American Flag Act of 2005, the FCC's OTARD antenna rule, the Fair Housing Act's reasonable-modification right, and the Americans with Disabilities Act as to common areas open to the public.⁴ The sections that follow lay out the framework, the compliance duties it creates, and the recent moves in the legislature and the courts.

The legal framework

Architectural review authority under CCIOA and the declaration

An association's power to approve or deny a member's modification starts in the recorded declaration, along with any architectural guidelines or rules adopted under it — all of it operating beneath the ceiling CCIOA sets. A typical setup hands review to an architectural review committee, which measures each application against recorded design standards, and lets an owner appeal to the executive board. CCIOA applies in full to communities created on or after July 1, 1992, and only in part to older ones; for communities formed before that date, the pre-1992 Colorado Condominium Ownership Act remains on the books and still recognizes condominium ownership and declaration concepts, even though CCIOA is the modern framework that does most of the work.² When a court reviews an architectural decision, Colorado gives the association room. The standard traces back to the Colorado Supreme Court's 1969 decision in Rhue v. Cheyenne Homes, Inc., 449 P.2d 361, 363 (Colo. 1969), which held that a refusal to approve plans "must be reasonable and made in good faith and must not be arbitrary or capricious" — a rule Colorado courts have applied to association decisions ever since through the business judgment rule.⁵ That deference stops at a hard limit. If a decision would enforce a covenant that CCIOA declares void as against public policy, reasonableness will not rescue it, because C.R.S. § 38-33.3-104 says the rights CCIOA confers cannot be waived or varied by agreement — and the § 38-33.3-106.5 prohibitions sit among those non-varying rights.⁶

Protected modifications under CCIOA

In each protected category, CCIOA blocks an effective prohibition but permits reasonable, content-neutral regulation.

Solar and renewable energy. C.R.S. § 38-33.3-106.5(1.5) says an association "shall not effectively prohibit renewable energy generation devices, as defined in section 38-30-168."¹ Section 38-30-168(1)(a) then voids any covenant that "effectively prohibits or restricts the installation or use of a renewable energy generation device" — a term the statute defines to include a solar energy device, a qualifying wind-electric generator, and a heat pump system.⁷ The association keeps some say over appearance. It may restrict dimensions, placement, or external look, but only if the restriction does not raise the device's cost by more than ten percent or cut its performance or efficiency by more than ten percent, and it must finish its review within sixty days.⁷

Xeriscape and turf. C.R.S. § 38-33.3-106.5(1)(i), as amended by House Bill 21-1229, protects xeriscape, nonvegetative turf grass, and drought-tolerant or nonvegetative landscapes used as ground cover. The association may still adopt and enforce design or aesthetic guidelines, and it may regulate the type, number, and placement of drought-tolerant plantings and hardscapes.¹ We could not confirm one often-cited detail — a backyard-only limit on nonvegetative turf — in the official statutory text we reviewed, so we do not assert it here.

Signs and flags. Under C.R.S. § 38-33.3-106.5(1)(a), an association may not bar or regulate a flag based on its subject matter, message, or content. It may prohibit flags that carry commercial messages, and it may set reasonable, content-neutral rules on the number, location, and size of flags and flagpoles. C.R.S. § 38-33.3-106.5(1)(c) protects political signs: the association may regulate size and number, and it may restrict display until roughly 45 days before an election and past 7 days after it.¹

Fire-hardened materials. Amendments that took effect March 12, 2024 added protection for fire-hardened building materials. C.R.S. § 38-33.3-106.5(3) voids any provision that prohibits their installation, use, or maintenance, with the definition at § 38-33.3-106.5(3)(e)(I), and C.R.S. § 38-30-168(5) carries a parallel voiding provision. An association also may not require cedar shakes or other flammable roofing materials under § 38-33.3-106.5(2).¹

EV charging. C.R.S. § 38-33.3-106.8, added by Senate Bill 13-126 effective May 3, 2013 and later expanded, bars a residential association from effectively prohibiting a Level 1 or Level 2 EV charging system. The owner pays for installation, and the association may not charge any fee to place or use the system — though it may recover the actual cost of the electricity or a reasonable fee for access.⁸

ADUs and federal overlays

House Bill 24-1152, codified at C.R.S. §§ 29-35-401 to 405, requires each "subject jurisdiction" to allow one ADU, through an administrative approval process, as an accessory use to a single-unit detached dwelling wherever it already allows single-unit detached dwellings — starting June 30, 2025.³ The law defines a subject jurisdiction as a municipality with a population of 1,000 or more inside a metropolitan planning organization, or a qualifying portion of a county within a census designated place inside such an organization.⁹ The reach into HOAs lives at C.R.S. § 38-33.3-106.5(4): inside a subject jurisdiction (or an ADU supportive jurisdiction), any declaration, bylaw, or rule that restricts creating an ADU in a way § 29-35-403 forbids is void as a matter of public policy. Associations keep the power to impose "reasonable restrictions" — conditions that do not unreasonably raise construction cost, effectively prohibit construction, or extinguish the ability to build an ADU.¹ That reach stops at the subject-jurisdiction line. Outside one, the CC&Rs may still control ADUs, and that is what separates Colorado from California. California's Civil Code § 4751 makes void and unenforceable any covenant that "effectively prohibits or unreasonably restricts the construction or use of an accessory dwelling unit or junior accessory dwelling unit on a lot zoned for single-family residential use" — a statewide reach that answers to no particular jurisdiction.¹⁰ Four federal overlays bind every association no matter what: the Freedom to Display the American Flag Act of 2005 (Pub. L. 109-243), the OTARD rule (47 C.F.R. § 1.4000), the Fair Housing Act reasonable-modification right (42 U.S.C. § 3604(f)(3)), and ADA Title III as to common areas open to the public.⁴

Compliance obligations created by the framework

A. Architectural review process obligations. The declaration usually sets the application and submission requirements, the decision timelines, and any path for reconsideration or appeal. Those terms come from the governing documents, not from a specific CCIOA mandate, so the declaration may structure them as it sees fit. Once a renewable energy generation device enters the picture, though, state law imposes a hard clock: under C.R.S. § 38-30-168(2), the review period may not run past sixty days, a denial must not be arbitrary or capricious, and the association must spell out the basis for any denial in reasonable detail. Miss the window — fail to deny or return the application within sixty days — and the law deems it approved.⁷ Associations should keep records of every application and decision to defend against a later challenge.

B. Modifications the association must permit. State law requires the association to permit, subject to reasonable regulation: renewable energy generation devices (§ 38-33.3-106.5(1.5); § 38-30-168); xeriscape, nonvegetative turf, and drought-tolerant landscaping (§ 38-33.3-106.5(1)(i)); flags and political signs (§ 38-33.3-106.5(1)(a) and (1)(c)); fire-hardened building materials (§ 38-33.3-106.5(3)); and EV charging systems (§ 38-33.3-106.8).¹ The declaration cannot bargain these away, because § 38-33.3-104 makes them non-varying.⁶ Federal law adds its own must-permit list: display of the U.S. flag (Freedom to Display the American Flag Act), over-the-air reception antennas and dishes one meter or less in exclusive-use areas (OTARD, 47 C.F.R. § 1.4000), reasonable modifications at the disabled resident's expense (FHA, 42 U.S.C. § 3604(f)(3)(A)), and accessibility in common areas open to the public (ADA Title III).⁴ Every one draws the same line: an effective prohibition is barred, while reasonable, content-neutral or safety-based regulation is allowed.

C. ADU obligations and limits on HOA authority. Inside a subject jurisdiction or an ADU supportive jurisdiction, state law (§ 38-33.3-106.5(4), with the requirements at C.R.S. §§ 29-35-401 to 405) voids any covenant provision that prohibits an ADU as an accessory use to a single-unit detached dwelling. The association may enforce only the reasonable restrictions § 29-35-403 defines.³ Outside a subject jurisdiction, the declaration governs, and a covenant prohibition may still hold up under ordinary reasonableness review.

D. Enforcement, dispute resolution, and appeal obligations. Before an association fines an owner for an architectural violation, state law requires notice, an opportunity for a hearing, and a written responsible-governance policy with a fair and impartial fact-finding process (§ 38-33.3-209.5).¹¹ House Bill 22-1137 (2022) tightened the fining procedure. Its official summary calls for two 30-day periods to cure a non-safety violation before legal action, a 72-hour cure period for a threat to public safety or health, and a $500-per-violation cap on non-safety fines under C.R.S. § 38-33.3-209.5 — and it bars interest above 8 percent a year.¹² CCIOA also nudges the parties toward alternative dispute resolution (§ 38-33.3-124) and sets a one-year statute of limitations on actions to enforce building restrictions or force removal of an improvement, with attorney fees for the prevailing party (§ 38-33.3-123).¹³ Litigation runs the Colorado court path: District Court for trial, then the Colorado Court of Appeals, then the Colorado Supreme Court on discretionary review.¹⁴ The HOA Information and Resource Center inside the Colorado Division of Real Estate registers associations under § 38-33.3-401 and supplies information, but it does not mediate, arbitrate, give legal advice, or decide architectural disputes.¹⁴

Recent legislative and judicial activity

A. Recent bills

B. Recent appellate rulings

No Colorado Court of Appeals or Colorado Supreme Court opinion from the past 36 months squarely decides HOA architectural control, the protected-modifications section, solar, EV charging, landscaping, signs, or ADUs. The two closest recent CCIOA opinions answer adjacent questions.

C. Active legislative debates

The legislature keeps pressing water-conservation limits on turf and refining how ADUs get implemented. One measure, a proposed HOA alternative-dispute-resolution bill (House Bill 25-1123), was postponed indefinitely in the 2025 session.¹⁹

National positioning and related coverage

Colorado sits near the top of the modification-protection spectrum. It pairs broad statutory protection for solar, EV charging, xeriscape and turf, signs, flags, and fire-hardened materials under C.R.S. § 38-33.3-106.5 with an HOA-preemption approach to ADUs under House Bill 24-1152. Here is the precision that matters: Colorado's ADU reach into HOA covenants covers subject jurisdictions, not the whole state, which places it a step below California's statewide ADU preemption under Civil Code § 4751. It stands above strong-protection states whose ADU rules bind only municipalities rather than HOAs, such as Arizona, and well above states largely silent on ADUs in the HOA context, such as Arkansas and Alabama. For a multi-state operator, the takeaway is simple: statute forecloses most modification fights in Colorado, while ADU authority turns on one threshold question — does the community sit within a subject jurisdiction?

The federal frameworks — the Freedom to Display the American Flag Act, OTARD, the Fair Housing Act, and the ADA — apply to Colorado associations regardless of the state framework.

Recommendations

Immediate (all communities). Audit the declaration and architectural guidelines against C.R.S. § 38-33.3-106.5 and § 38-30-168, then remove — or stop enforcing — any outright ban on solar, EV charging, xeriscape or nonvegetative turf, flags, political signs, or fire-hardened materials. Swap the bans for reasonable, content-neutral standards. For renewable-energy applications, build a review workflow that clears the 60-day deadline in § 38-30-168(2), so nothing slides into automatic deemed approval.

Threshold ADU determination. Use the Colorado Department of Local Affairs applicability resources to confirm whether the community sits in a subject jurisdiction. If it does, treat any covenant ADU prohibition as void and adopt a reasonable-restriction ADU policy — design, setbacks, materials — that does not unreasonably raise cost, effectively prohibit, or extinguish the ability to build. If it does not, the CC&Rs may still control, but document the jurisdictional basis before you lean on a prohibition.

Enforcement discipline. Bring fining and collection procedures into strict compliance with § 38-33.3-209.5, § 38-33.3-316.3, HB 22-1137, and HB 25-1043 — cure periods, the $500 non-safety fine cap, written policies, and updated registration data all included. After HB 25-1043, a single procedural deviation can stay a foreclosure and forfeit remedies.

Benchmarks that would change this guidance. Watch three things. First, a Colorado appellate opinion that directly interprets § 38-33.3-106.5 or the ADU reach in § 38-33.3-106.5(4), which would supply binding construction where none exists today. Second, the Colorado Supreme Court's decision in the Willis certiorari, which could shift common-element duty exposure. Third, any 2026-2027 amendment that expands the ADU reach beyond subject jurisdictions, which would push Colorado toward the California statewide model.

Caveats

• The subsection designations for § 38-33.3-106.5 have drifted across amendments. The labels used here — solar at (1.5); landscaping at (1)(i); flags at (1)(a); political signs at (1)(c); fire-hardened at (3); ADU reach at (4) — track the current official CCIOA text, but the fire-hardened definition subparagraph, cited as (3)(e)(I) per § 38-30-168's cross-reference, deserves a check against the specific recorded amendment when precision matters.
• We could not confirm the often-cited backyard-only limit on nonvegetative turf in the official statutory text we reviewed, so we do not assert it as fact.
• No qualifying appellate ruling on architectural control, protected modifications, or ADUs exists in the past 36 months. The two cases reported here are the nearest adjacent authority, and Willis remains under Supreme Court review.
• The federal overlays — flag act, OTARD, FHA, ADA — are federal law, not Colorado statute, and we keep them distinct here; Colorado adds its own separate flag and sign protections under § 38-33.3-106.5.

1. Colo. Rev. Stat. § 38-33.3-106.5, Colorado Common Interest Ownership Act (Colo. Div. of Real Estate, official text 2025) ↩
2. Colo. Rev. Stat. §§ 38-33-101 et seq., Colorado Condominium Ownership Act; CCIOA applicability, Colo. Rev. Stat. § 38-33.3-115 (Colo. Div. of Real Estate, official text) ↩
3. H.B. 24-1152, Accessory Dwelling Units, codified at Colo. Rev. Stat. §§ 29-35-401 to -405 (Colo. Gen. Assemb. 2024) ↩
4. Freedom to Display the American Flag Act of 2005, Pub. L. No. 109-243, 120 Stat. 572 (Congress.gov); FCC Over-the-Air Reception Devices Rule, 47 C.F.R. § 1.4000 (FCC); Fair Housing Act, 42 U.S.C. § 3604 (GovInfo) ↩
5. The Business Judgment Rule and Common Interest Communities, Colo. Law. (Colo. Bar Ass'n) (discussing Rhue v. Cheyenne Homes, Inc., 449 P.2d 361 (Colo. 1969)) ↩
6. Colo. Rev. Stat. § 38-33.3-104, Variation by agreement (Colo. Div. of Real Estate, official CCIOA text) ↩
7. Colo. Rev. Stat. § 38-30-168, Unreasonable restrictions on renewable energy generation devices or fire-hardened building materials (Colo. Gen. Assemb., C.R.S. tit. 38, 2024) ↩
8. Colo. Rev. Stat. § 38-33.3-106.8, Unreasonable restrictions on electric vehicle charging systems (added by S.B. 13-126) (Colo. Gen. Assemb., C.R.S. tit. 38, 2024) ↩
9. Accessory Dwelling Units, subject-jurisdiction definition and compliance timeline (Colo. Div. of Local Gov't) ↩
10. Cal. Civ. Code § 4751, Accessory Dwelling Units (comparative reference) ↩
11. Colo. Rev. Stat. § 38-33.3-209.5, Responsible governance policies and due process for imposition of fines (Colo. Div. of Real Estate, official CCIOA text) ↩
12. H.B. 22-1137, HOA Board Accountability and Transparency (Colo. Gen. Assemb., official summary) ↩
13. Colo. Rev. Stat. § 38-33.3-123, Enforcement and limitation; § 38-33.3-124, Alternative dispute resolution (Colo. Div. of Real Estate, official CCIOA text) ↩
14. About the HOA Center, Colo. Div. of Real Estate (registration under Colo. Rev. Stat. § 38-33.3-401; does not mediate, arbitrate, or enforce); Colorado Judicial Branch (District Court to Court of Appeals to Supreme Court) ↩
15. H.B. 25-1113, Limit Turf in New Residential Development (Colo. Gen. Assemb. 2025) ↩
16. H.B. 25-1043, Owner Equity Protection in HOA Foreclosure Sales (Colo. Gen. Assemb. 2025); HB25-1043 Summary (Colo. Div. of Real Estate) ↩
17. Frisco Lot 3 LLC v. Giberson Ltd. P'ship, LLLP, 2024 COA 125, No. 22CA2219 (Colo. App. Dec. 12, 2024) ↩
18. Willis v. Twin Shores Master Owner Ass'n, 2025 COA 37, No. 24CA0369 (Colo. App. Apr. 3, 2025) ↩
19. 2025 Colorado Legislative Summaries, including H.B. 25-1123 (Homeowners' Association Alternative Dispute Resolution), Postponed Indefinitely (Altitude Community Law) ↩