How Denver Handles Accessory Structures: A Practical Guide
Denver maintains 158 local ordinances across all categories, and 5 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Denver falls on the strict-to-permissive spectrum compared to other cities.
ADU Rules
Denver allows one accessory dwelling unit per primary house, duplex, or multi-unit building in every zone district, but a permit applicant in a single-unit district must already occupy the primary home as their residence.
Key details: ADUs allowed: One per primary dwelling unit. Non-SU-district lots: Detached duplex/row/town house only. SU-district owner rule: Owner must occupy primary home. Prohibited structures: Mobile homes, RVs, trailers. Max fine: $999 per day violating.
Building or operating a noncompliant ADU is a Zoning Code violation; the city can suspend or revoke the zoning permit, and unresolved Code violations carry a fine up to $999 per offense, with each day of continued violation a separate offense.
ADU Owner Occupancy
Denver requires at least one owner of the primary home to live there as a primary residence when applying for an Accessory Dwelling Unit permit, in single-unit zone districts where ADUs are allowed.
Key details: Applies to: Single-Unit (SU) zone districts only. Core rule: One owner must occupy primary dwelling. Exception: Simultaneous new-build construction. Exempt: Denver Housing Authority-owned properties.
An ADU permit application that can't document owner occupancy under this rule is denied by the Zoning Administrator until the requirement is met or an exception applies.
Shed & Carport Rules
Denver requires 21 feet of vehicle maneuvering clearance in front of carport openings, or a 5-foot setback when the opening faces an alley.
Key details: Clearance (non-alley-facing): 21 feet minimum. Setback (facing alley, not opening onto it): 5 feet minimum. Setback (opening onto alley): 21 feet minimum. Applies to: Single-unit and two-unit dwellings.
Zoning Administration in Community Planning and Development enforces these standards at permit review; a carport built without the required maneuvering clearance can be denied a permit or ordered corrected as a zoning violation.
Tiny Homes
Denver's zoning code treats a tiny home built to the state's chassis-based definition as a type of Manufactured Home, so it can only be sited in the Manufactured Home Community zone district, not in a standard residential backyard.
Key details: Classification: Tiny home = Manufactured Home. Allowed zone district: Manufactured Home Community (MHC) only. Village alternative: Congregate Living use category. State definition cited: C.R.S. § 24-32-3302(35). Enforcing agency: Community Planning and Development.
Siting a tiny home outside the Manufactured Home Community zone district, or running an unpermitted congregate tiny home village, is a zoning violation enforced by Community Planning and Development, subject to a correction order and fines for continued noncompliance.
This is not one of those rules that cities tend to ignore. Denver actively enforces its tiny homes requirements.
ADU Rental Restrictions
Denver requires an accessory dwelling unit to stay under the same ownership as the main house, and the owner must live on site before getting an ADU permit.
Key details: Ownership rule: ADU must share owner with main house. Occupancy proof: 2 of 6 listed documents required. Exception: Simultaneous new-construction ADUs exempt. DHA exemption: Denver Housing Authority properties exempt.
Building or renting an ADU under separate ownership from the primary home, or applying for an ADU permit without an owner occupying the primary residence, violates the zoning use limitation and can block permit approval or trigger a zoning enforcement case through Community Planning and Development.
The Bottom Line
Denver's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Denver is broadly strict or permissive.
Keep in mind that Denver can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.