What do Colorado ADU permits cost?
✓ Verified against code · August 19, 2026
Fees vary enormously by city. Fort Collins is the most expensive in the corpus: a $6,925 flat Basic Development Review fee alone, with the city's own guidance putting total fees at $20,000 to $25,000 before construction. Longmont typically runs $5,000 to $10,000 in city fees plus school district fees. Westminster is the outlier at the other end — no park, school, or land-dedication impact fees apply to ADUs at all. Colorado Springs charges no land-use application fee. Pueblo has no published ADU-specific fee schedule, so its costs remain unverified.
Citation: varies by city — see city pages
How current is this?
Colorado’s ADU rules run under HB24-1152 (2024). HB24-1152 (codified at C.R.S. 29-35-401 through 29-35-405) required every Colorado city or town of 1,000+ residents inside a metropolitan planning organization to allow one ADU wherever a single-family home is allowed, through administrative approval, by June 30, 2025 — banning ongoing owner-occupancy mandates (an at-application residency check is allowed), most new-parking requirements, and design standards that would block an ADU in the 500–750 sq ft range. Note the contrast with Washington: one ADU per lot, not two. We verified this answer against primary sources on August 19, 2026, and every change we catch is logged in the changelog.
More Colorado ADU questions
- What is HB24-1152?
- Which Colorado cities are not complying with the ADU law?
- Does Colorado allow two ADUs per lot?
- What happened to Lakewood's zoning code?
- How big can an ADU be in Colorado?
- What is the 500 to 750 square foot size protection in Colorado's ADU law?
- Do Colorado cities require ADU owners to live on the property?
- Can Colorado cities require parking for an ADU?
- What does home rule mean for Colorado's ADU law?
- How long does it take to get an ADU permit approved in Colorado?
- Can I rent out my Colorado ADU short-term on Airbnb?
Not legal advice — local ordinances can go further than the state floor. The citation above points at the governing statute; check your city’s code for the specifics.