ADU rules in Littleton, CO — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Littleton passed Ordinance No. 09, Series 2025, allowing ADUs in all residential zones to comply with Colorado HB 24-1152. The ordinance increases maximum ADU size to 1,000 sq ft, eliminates extra parking requirements, and removes design restrictions that don't apply to primary homes. Effective June 2025.
In May 2025, Littleton City Council approved Ordinance No. 09, Series 2025, amending the ULUC to allow one accessory dwelling unit per single-family lot in all residential zones. This complies with Colorado HB 24-1152, which requires subject jurisdictions to allow ADUs through an administrative approval process by June 30, 2025. Key provisions include: maximum ADU size of 1,000 sq ft (up from previous limits), no additional parking requirements, no owner-occupancy mandates at time of permitting (per state law), and elimination of design restrictions that do not apply to the primary dwelling. The Littleton Planning Commission unanimously recommended approval after extensive community engagement from June 2024 through March 2025. A proposed Charter Amendment 3A sought to freeze residential land use rules to January 1, 2025, which would have nullified the ADU ordinance.
ADU without permit: stop-work order and mandatory permitting. Non-compliant ADU: correction to meet ULUC standards.
Littleton, CO
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Side-by-side rule comparisons with other cities in Arapahoe County.
See how other cities in Arapahoe County handle adu rules.
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