ADU Regulations in Aurora, Colorado
Colorado's third-largest city, Aurora permits ADUs through its local zoning code. Colorado has no statewide ADU mandate, so Aurora's municipal code establishes all requirements including minimum lot sizes and design review standards.
Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Aurora as of 2026. Regulations are governed by local zoning ordinances, as Colorado has no statewide ADU mandate (HB 24-1152 addresses transit density).
| Regulation | Requirement |
|---|---|
| Maximum Size | 1,200 sq ft |
| Property Setbacks | 5 ft rear, 5 ft side |
| Extra Parking Required | Required (1 space) |
| Owner Occupancy | Required |
Additional Local Requirements for Aurora
- ADU on lots 6,000 sq ft minimum
- Minimum 300 sq ft
- Design review for exterior changes
- Short-term rentals prohibited
- ⚠️ CO has NO statewide ADU mandate
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Can I build an ADU in Aurora?
Aurora allows ADUs in single-family zones. The city has specific design standards and a minimum lot size requirement.
How big can my ADU be in Aurora?
What is the maximum ADU size allowed in Aurora? ADUs in Aurora can be up to 1,200 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Aurora planning department before designing your project.
What about setbacks and other requirements in Aurora?
What are the setback requirements for an ADU in Aurora? ADUs in Aurora generally require setbacks of 5 ft rear, 5 ft side. California state law (AB 68) limits local setback requirements to 4 feet for existing structures, but always verify with local zoning.
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