Colorado residential & ADU permit data

Colorado created its first statewide accessory-dwelling-unit framework with House Bill 24-1152 (2024). Beginning June 30, 2025, 'subject jurisdictions' — broadly, the larger Front Range municipalities within a metropolitan planning organization, including Denver, Boulder, Colorado Springs, Fort Collins and Pueblo — must allow at least one ADU through an administrative (ministerial) approval process wherever they permit single-family detached homes. Administrative approval means no public hearing and no neighbor veto for a unit that meets the jurisdiction's objective setback, height and design standards.

The law curtails the local rules that typically block ADUs. Subject jurisdictions generally may not impose an owner-occupancy requirement for a rental ADU, and parking can be required only in narrow circumstances — for example, where there is no existing off-street parking, the zone required parking for the main home as of January 1, 2024, and the block prohibits on-street parking. The state paired the mandate with grant funding and pre-approved design templates to help cities and homeowners comply, and it limits how steeply local fees can be set against the units. Because approval is administrative rather than discretionary, a conforming application should clear without a hearing, which shortens the timeline and improves the certainty of approval for homeowners and builders working in the subject jurisdictions.

HB24-1152 is the ADU piece of a broader 2024 land-use package. Its companion, HB24-1313, requires qualifying 'transit-oriented communities' to plan for greater housing density near rail and frequent-bus corridors rather than imposing a blanket statewide duplex mandate — a more targeted approach than the across-the-board middle-housing laws in Oregon and Washington.

That makes Colorado's reform narrower than California's ministerial statewide ADU regime and Montana's all-municipalities mandate, but a clear break from pure home-rule local control, and it is concentrated exactly where growth pressure is highest. Its design is closest to Arizona's: a guarantee aimed at the larger cities rather than every town. Igni sources live residential-construction permit data from the City and County of Denver's ArcGIS open-data portal, plus Boulder, so new ADU and transit-oriented activity shows up as the 2024 laws roll out across the Front Range.

This is an informational summary, not legal advice; the rules apply only to subject jurisdictions and each local implementing ordinance controls the details, so verify the current law before relying on it.