Colorado Statewide Rule

Colorado HB24-1152 Requires Statewide ADU Allowance

Few RestrictionsApplies statewide across Colorado (2026)

Key Facts

Statute: C.R.S. 29-35-401 et seq.
Bill: HB24-1152
Effective Date: June 30, 2025
Required Allowance: One ADU per lot

Last verified: September 5, 2026Source: Colorado General Assembly

Summary

Colorado House Bill 24-1152 requires Tier 1 municipalities to permit at least one accessory dwelling unit on lots zoned for single-family use, preempting local bans starting June 30, 2025.

29-35-403. Accessory dwelling unit requirements for a subject jurisdiction. (1) On or after June 30, 2025, a subject jurisdiction shall allow, subject to an administrative approval process, one accessory dwelling unit as an accessory use to a single-unit detached dwelling in any part of the subject jurisdiction where the jurisdiction allows single-unit detached dwellings.

Source: Colorado General AssemblyView official code

Full Breakdown

HB24-1152, codified at C.R.S. 29-35-401 et seq., defines subject (Tier 1) jurisdictions as cities and counties within metropolitan planning organizations that meet population thresholds. These jurisdictions must adopt regulations allowing one ADU on single-family lots 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 subject areas 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.

Sources

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