Denver Zoning — Form-Based Code & Building Rules
Data version: Q2 2026 · Last updated 2026-05-13
TL;DR. Denver uses a modern form-based zoning code adopted in 2010 that regulates building shape, placement, and frontage rather than just land use. Zone districts include Suburban (S-SU, S-TU, S-MU), Urban (U-SU, U-TU, U-RH), General (G-MU, G-MS, G-RH), and Industrial (I-MX, I-A). Colorado HB 24-1152 now requires ADUs statewide. Buildability™ returns your exact zone district, building form standards, and development potential.
Denver form-based zone districts
S-SU (Suburban Single Unit): single-family with ADUs, 3,000-6,000 sq ft lots, 2.5 stories. S-TU (Suburban Two Unit): duplexes and rowhouses. G-MU (General Mixed-Use): retail ground floor with residential above, 3-12+ stories depending on designation, 0 ft front setback. G-MS (General Main Street): walkable mixed-use along commercial corridors. I-MX (Industrial Mixed-Use): creative, light industrial, and residential in transitioning areas.
ADU rules in Denver
Colorado HB 24-1152 (effective June 2025) requires all municipalities over 1,000 residents to allow ADUs. Denver already allowed ADUs by right in all residential zones before the state mandate. Size: 650-1,000 sq ft depending on lot size. Administrative approval only — no public hearing, no neighbor notification. No additional parking required. ADUs can be rented separately. This makes Denver one of the most ADU-friendly cities in the U.S.
Development standards
S-SU-3 (most common): 3,000 sq ft minimum lot, 2.5 stories, 30 ft setback-adjacent height. G-MU-3: 3 stories / 38 ft, mixed-use, build-to requirements at front property line. G-MU-12+: 12+ stories in downtown and transit areas. Form standards specify building placement, articulation, and street-level activation rather than just setback and height numbers. Denver Landmark districts require additional Commission review.
Permit process
Denver Community Planning and Development (CPD) handles all permits through e-permits portal. Administrative review for by-right projects (no hearing). Residential permits: 4-8 weeks. Site Development Plan required for larger projects: 3-6 months. Permit costs: $2,000-$10,000 for residential. Denver is considered one of the more efficient permitting jurisdictions among major U.S. cities.
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