RMX-1 Zone in Boulder, CO
RMX-1 zoning district rules in Boulder, CO. Permitted uses, setbacks, height limits, and lot coverage requirements.
The RMX-1 zone in Boulder, CO is a residential district (Residential Mixed Density). Permits a range of residential density from single-family through multi-family, often applied in transition areas between low-density and higher-density zones. This zone requires a 20 ft front setback, 5 ft side setback, and 15 ft rear setback. Maximum building height is 35 feet (2 stories). Maximum lot coverage is 50%.
Common Permitted Uses
- Single-family homes
- Duplexes
- Small apartment buildings
Permits a range of residential density from single-family through multi-family, often applied in transition areas between low-density and higher-density zones.
Setback Requirements
| Setback Type | Requirement |
|---|---|
| Front Setback | 20 feet |
| Side Setback | 5 feet |
| Rear Setback | 15 feet |
Boulder BRC. Residential Mixed-1 — allows duplexes and small multifamily. Common in North Boulder and University Hill areas.
Height Limits
- Max Height
- 35 feet
- Max Stories
- 2
Boulder BRC. Residential mixed.
Lot Coverage
- Max Coverage
- 50%
Boulder BRC. Residential mixed zone allows slightly higher coverage.
Parking Requirements
Single-family: 2 spaces per single-family dwelling per Boulder BRC. Tandem parking acceptable. Covered parking not required but practical given snow. Multi-family: 1–2 spaces per unit. Reduced near Boulder Bus Rapid Transit (SKIP, JUMP, BOUND) corridors. Boulder has one of Colorado's most extensive BRT networks.
Source: Boulder Revised Code Title 9, Section 9-8-5 — Accessory Units; Colorado Revised Statutes Title 29 (HB 24-1152 codification). Last verified April 6, 2026. View source