Colorado ADU Rules Law: Statewide Accessory Structures Rules (2026)

Key Facts

Statute: CRS Title 29 Article 37
Bill: HB24-1152
Effective Date: June 30, 2025
Required Allowance: One ADU per lot

Full Breakdown

HB24-1152, codified in CRS Title 29 Article 37, defines Tier 1 municipalities as cities and counties within metropolitan planning organizations that meet population thresholds. These jurisdictions must adopt regulations allowing one ADU subject only to objective standards comparable to single-family homes. Prohibited restrictions include mandatory owner occupancy, additional parking minimums above one space, and short-term rental bans solely targeting ADUs. The Department of Local Affairs publishes a model code; non-compliant cities lose eligibility for certain state grants. Smaller municipalities outside Tier 1 retain discretion.

Violations & Penalties

Local ordinances conflicting with HB24-1152 are unenforceable after June 30, 2025. Non-compliant Tier 1 municipalities forfeit access to specified state housing grants and may face declaratory action by aggrieved property owners.

Frequently Asked Questions

Does the ADU law apply to every Colorado city?

No. It applies to Tier 1 subject jurisdictions inside metropolitan planning organizations meeting the population threshold. Rural towns and counties outside MPOs keep current ADU discretion.

Can my Tier 1 city require me to live on the property to rent the ADU?

No. HB24-1152 prohibits owner-occupancy mandates and excessive parking requirements. Cities may impose only objective design standards comparable to those for single-family homes.

Colorado HB24-1152 Requires Statewide ADU Allowance

Key Facts

Full Breakdown

Violations & Penalties

Frequently Asked Questions

Sources

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