Boulder Zoning & Land Use Guide
Key Zoning Facts
Boulder Zoning Overview
Boulder is a city of approximately 106,000 residents located at the base of the Flatirons in Boulder County. The city is home to the University of Colorado and is known for its extensive open space program, which has preserved over 46,000 acres of land surrounding the city. Boulder's zoning code, contained in Title 9 of the Boulder Revised Code, employs a comprehensive district system that addresses the city's unique combination of natural constraints, housing demand, and growth management policies. The city's Residential Growth Management System (also known as the "Danish Plan") has limited the number of new residential building permits issued annually since 1977, making Boulder one of the most growth-managed cities in the West.
Boulder's land use is shaped by its geographic constraints -- the Flatirons and foothills to the west, open space to the north and south, and the Rocky Flats area to the southeast. The city's height limit, originally adopted by voters and now codified as a 55-foot general limit in most areas with lower limits in residential zones, keeps building heights low relative to other cities of similar size. Boulder's planning framework emphasizes sustainability, multimodal transportation, affordable housing, and historic preservation. The Pearl Street Mall and surrounding downtown serve as the city's commercial and cultural center.
Planning and Development Services manages zoning, development review, and building permits. The city's development review process is known for being thorough, with design review requirements in many areas.
Key Zoning Districts
Boulder's residential districts range from RL-1 (very low density, 30,000 sq ft minimum lots) and RL-2 (standard low density) to RM (medium density allowing duplexes and townhomes) and RH (high density allowing apartments). Commercial districts include BMS (Business Main Street), BC (Business Community), and BR (Business Regional). Boulder also has Industrial and Public districts and several environmental and historic overlay zones.
ADU Regulations
Boulder has allowed ADUs for longer than most Colorado cities. Current regulations permit ADUs up to 1,000 square feet and 22 feet in height in residential zones. Boulder's local regulations supplement Colorado HB 24-1152, with design compatibility requirements and a more involved review process. Owner-occupancy of either the primary dwelling or ADU is required. Permits typically take six to ten weeks.
Development Process
Boulder's development review process includes concept review, site review, and building permit stages. Many projects require design review, particularly in the downtown, university hill, and historic areas. The Planning Board reviews major projects, while administrative staff handles minor applications. Building permits are processed by the Building Services Center, with timelines that vary based on project complexity.
Regulatory Layers That Apply in Boulder
Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.
Federal
- FEMA Flood Zones: Applicable
- View FEMA Flood Map
County — Boulder County
- Role: Property records, tax assessment, unincorporated area planning
City / Municipal
The city's zoning ordinance, building codes, and local permits form the primary layer of land-use regulation for your property.
Overlay Districts
No overlay districts identified.
Private Restrictions
- HOA / CC&Rs common: Yes
- Check HOA CC&Rs for additional restrictions.
Primary Zoning Districts
- Min Lot
- 30,000 sq ft
- Max Height
- 35 ft
- Front Setback
- 25 ft
- Side Setback
- 10 ft
- Rear Setback
- 25 ft
- Min Lot
- 7,000 sq ft
- Max Height
- 35 ft
- Front Setback
- 20 ft
- Side Setback
- 5 ft
- Rear Setback
- 15 ft
- Min Lot
- None
- Max Height
- 35-55 ft
- Front Setback
- 0 ft
- Side Setback
- 0 ft
- Rear Setback
- 10 ft
ADU Rules in Boulder
- Max Size
- 1,000 sq ft
- Max Height
- 22 ft
- Rear Setback
- 5 ft
- Side Setback
- 5 ft
- Parking
- No additional parking required
- Owner Occupancy
- Required for either primary or ADU
- Permit Timeline
- 6-10 weeks
Permit Costs & Timelines
Permit Costs & Timelines
Specific permit fee schedules for Boulder are available from the local planning department. Fees vary based on project type, scope, and valuation.
Check Boulder permit fees →