ADU rules in Aurora, CO — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Aurora allows accessory dwelling units on single-family lots per UDO Section 146-4.7.6, with owner-occupancy and size caps tied to the primary dwelling.
Aurora permits ADUs (attached or detached) on lots zoned for single-family use subject to the Unified Development Ordinance. Detached ADUs are limited to 1,000 square feet or a percentage of the primary dwelling, whichever is less, and must meet setbacks, height, and lot coverage standards for the underlying zone district. The property owner must occupy either the primary residence or the ADU. Separate utility meters are typically not permitted, and short-term rental use of an ADU is restricted. Building permits, structural plans, and compliance with IRC 2021 as adopted in Aurora are required. HOA covenants may impose additional restrictions beyond city rules.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Aurora code enforcement directly for current fines, enforcement procedures, and hearing options.
Aurora, CO
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Aurora, 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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