RL-1 Zone in Boulder, CO
RL-1 zoning district rules in Boulder, CO. Permitted uses, setbacks, height limits, and lot coverage requirements.
The RL-1 zone in Boulder, CO is a residential district (Single-Family Residential). Permits one dwelling unit per lot. Typically the most restrictive residential zone. Designed to preserve the character of established single-family neighborhoods. This zone requires a 25 ft front setback, 5 ft side setback, and 25 ft rear setback. Maximum building height is 35 feet (2 stories). Maximum lot coverage is 35%.
Common Permitted Uses
- Single-family homes
Permits one dwelling unit per lot. Typically the most restrictive residential zone. Designed to preserve the character of established single-family neighborhoods.
Setback Requirements
| Setback Type | Requirement |
|---|---|
| Front Setback | 25 feet |
| Side Setback | 5 feet |
| Rear Setback | 25 feet |
Boulder BRC. RL-1 Low Density Residential — the primary single-family zone in most established Boulder neighborhoods.
Height Limits
- Max Height
- 35 feet
- Max Stories
- 2
Boulder BRC. Low-density residential. Mountain views and neighborhood character protected.
Lot Coverage
- Max Coverage
- 35%
Boulder BRC. Standard low-density single-family 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