Permit Required? Required
Typical Fee Range $2,000–$6,000 Covers plan review, building permit, SUDP, and Denver Water system development charges.
Fee Method Valuation-based
Apply Online Apply at Denver Community Planning and Development →

What's Required in Denver

  • ADUs are allowed citywide in all residential zones as of 2026 (Group Living amendment).
  • Maximum size based on lot size: 650 sq ft (lot <6k) to 1,000 sq ft (lot >7k).
  • Must have independent kitchen, bathroom, and a separate entrance.
  • Owner-occupancy requirement for the primary residence has been removed.
  • Must maintain setbacks appropriate for the specific zone district.
  • No additional off-street parking is required for ADU units in Denver.

How to Get a ADU Permit in Denver

1

Step 1: Check Size Limits

Identify your maximum ADU size based on your property's lot square footage (2026 rules).

2

Step 2: SUDP Submission

Apply for a Sewer Use and Drainage Permit to ensure wastewater capacity.

3

Step 3: Portal Submission

Submit 'Residential New Construction' application via Denver E-Permits.

4

Step 4: Fee Payment

Pay the permit, plan review, and Denver Water impact fees ($2,000+ typical).

5

Step 5: Full Inspection Series

Schedule Foundation, Framing, Rough MEP, and Final inspections.

Frequently Asked Questions

Yes, detached carriage houses are now allowed citywide on qualifying residential lots.
Permit and city review fees typically start around $2,000, excluding construction costs.
No, owner-occupancy rules were removed in late 2024 to increase housing flexibility.