ADU rules in Weld County, CO — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
In unincorporated Weld County, one accessory dwelling unit is allowed per legal lot where Article III permits it. The ADU may be attached, detached, or inside a single-family dwelling, but is barred on a lot with a duplex. Greeley and Evans set their own city ADU rules.
Weld County Code Chapter 23 (Zoning) governs ADUs on unincorporated land, which covers most of this large agricultural county. Under Section 23-4-600, before a building permit issues an ADU must sit on a lot the Department of Planning Services has verified as a legal lot, no lot may hold more than one ADU, and an ADU cannot go on a lot that already has a duplex. The ADU must meet all bulk requirements (setback, offset, height) of the applicable zone district. Residents inside the cities of Greeley or Evans follow those cities' own municipal codes, not the county code. Confirm zoning eligibility with Weld County Planning Services before building.
Building an ADU without meeting Section 23-4-600 or without a zoning and building permit is a zoning violation enforced by Weld County Code Compliance under Chapter 23, Article X, with orders to correct, permit, or remove.
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