Greeley, CO Accessory Structures: ADU Rules (2026)
ADU rules in Greeley, CO, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Units per lot
- One ADU maximum
- Size cap
- 60% of home or 1,200 sf
- Eligible principal use
- Detached house or duplex only
- Governing section
- § 24-403.b
Summary
Greeley allows one accessory dwelling unit per lot with a detached house or duplex, capped at 60 percent of the principal home's living area or 1,200 square feet, whichever is less, under Sec. 24-403.b.
1.One accessory dwelling may be permitted per lot only when associated with a detached house or duplex/multi-unit house.2.Accessory dwelling units may be located in a detached accessory building or located within the principal building (such as an attic or basement apartment).3.The accessory dwelling shall not exceed 60 percent of the living area of the principal dwelling or 1,200 square feet, whichever is less.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Municipal Code: Supplement 6 Update 1).
Full Breakdown
Sec. 24-403.b permits one accessory dwelling per lot only where the principal building is a detached house or duplex/multi-unit house, and Table 24-4-2 lists 'Accessory dwelling unit' as permitted (P) in the R-M, R-H, C-L, C-H, MU-L and MU-H districts. The ADU can sit inside the principal building, an attic or basement apartment, or in a detached structure such as a garage apartment, but it cannot exceed 60 percent of the principal dwelling's living area or 1,200 square feet, whichever is less. Parking for the unit must be confined to the garage, driveway or street directly in front of the dwelling, and any detached ADU must also meet Chapter 5's residential design standards.
Violations & Fines
Building or renting an ADU over the 60-percent/1,200-square-foot cap, adding a second accessory unit on one lot, or skipping the required parking and design standards is enforceable as a zoning code violation.
Frequently Asked Questions
How big can an ADU be in Greeley?
Can I build an ADU on any lot in Greeley?
Sources & Official References
Other rules in Greeley
How Greeley compares: Easiest Cities to Build an ADU·Compare Greeley to another location·View the Colorado accessory structures overview
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