Denver, CO
Denver ADU Permit: do you likely need a permit?
Denver ADU feasibility is zoning-sensitive; expect zoning, building, SUDP, and trade review before an ADU can be built or occupied.
What the official sources say
Denver's permitting hub says permits are required for most construction, alteration, or repair work on private property. Denver's citywide ADU project and zoning materials show ADUs are governed by zoning allowances and standards; former Chapter 59 language allows one accessory dwelling unit use where single-unit dwellings are allowed and imposes standards for detached ADU structures.
Likely permit path
- Zoning confirmation that ADU use is allowed on the zone lot.
- Residential construction permit or plan review for new, attached, detached, or converted ADU space.
- SUDP and trade permits where sewer, electrical, plumbing, mechanical, gas, or HVAC work is included.
Watch-outs
- Denver ADU rules depend on zoning code, neighborhood context, detached structure standards, and sometimes former Chapter 59 rules.
- Garage work can implicate accessory-structure, demolition, asbestos, SUDP, and parking/site-plan issues.
- Historic district, landmark, bulk plane, height, setbacks, and rear-lot location can change feasibility.
Documents to gather
- Zone lot information, survey/site plan, existing structures, proposed unit location, and intended occupancy.
- Existing and proposed floor plans, utility scope, parking/driveway notes, and photos.
- Historic/landmark status, demolition scope, and contractor/trade details.
Questions to ask before applying
- Is this an ADU, JADU, attached ADU, detached ADU, garage conversion, or non-rental habitable-space conversion?
- What zoning district, overlays, coastal/historic/flood/fire conditions, HOA limits, or deed restrictions apply to the property?
- Will the unit include independent living, sleeping, cooking, and sanitation facilities?
- What building, zoning, trade, utility, addressing, parking, inspection, and certificate-of-occupancy steps apply before occupancy or rental use?
Official sources
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PermitCheckup provides informational permit-readiness guidance based on public sources. It is not legal, architectural, engineering, or contractor advice. Always confirm your project with the authority having jurisdiction before beginning work.