How big can a Greeley ADU be?
✓ Verified against code · August 19, 2026
The lesser of 60% of your home's living area or 1,200 sq ft — and a detached unit is further capped at half the house's footprint. On a small home, that 60% formula can compute below the 500–750 sq ft range state law protects, which is one of the code's apparent statute conflicts.
Citation: GMC §24-403.b.3
How current is this?
Greeley’s ADU rules run under Greeley Municipal Code Title 24 (Development Code), §24-403 (Ord 35-2021 (ADU section last amended by Ord 7-2023)). Greeley's ADU rules predate Colorado's ADU statute and haven't been amended since February 2023. The code text appears to conflict with C.R.S. 29-35-403 on zones, parking, and size — though notably, the state's October 2025 enforcement review did not list Greeley among non-complying jurisdictions, and the reason is undetermined. Where code and statute conflict, state law controls. We verified this answer against primary sources on August 19, 2026, and every change we catch is logged in the changelog.
More Greeley ADU questions
- Can I build an ADU in Greeley's R-L or R-E zones?
- How much parking does a Greeley ADU need?
- How long does a Greeley permit take?
All Greeley ADU rules → · Compare Colorado cities →
Not legal advice — lot-specific overlays can change the answer for your parcel. The citation above points at the governing code section; check it, or ask the city to confirm.