Longmont Zoning & Land Use Guide
Last updated: Verified:
Key Zoning Facts
Regulatory Layers That Apply in Longmont
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
| District Code | Name | Min Lot | Max Height | Front Setback | Side Setback | Rear Setback | FAR |
|---|---|---|---|---|---|---|---|
| R-SF | Residential Single-Family | 6,000 sq ft | 35 ft | 20 ft | 5 ft | 15 ft | — |
| R-MF | Residential Multi-Family | 6,000 sq ft | 45 ft | 20 ft | 10 ft | 15 ft | — |
| CC | Community Commercial | None | 40 ft | 10 ft | 0 ft | 10 ft | — |
ADU Rules in Longmont
ADUs:Allowed
- Max Size
- 800 sq ft
- Max Height
- 20 ft
- Rear Setback
- 5 ft
- Side Setback
- 5 ft
- Parking
- No additional parking required
- Owner Occupancy
- Not required
- Permit Timeline
- 4-6 weeks
Official Sources
Frequently Asked Questions
Frequently Asked Questions
Can I build an ADU in Longmont?
Yes. Longmont allows ADUs on residential lots under Colorado HB 24-1152. A building permit is required.
How do I find the zoning for my property in Longmont?
Use the Longmont Planning & Development Services online zoning map, or call (303) 651-8330.
What zones allow multi-family housing in Longmont?
Multi-family housing is permitted in R-MF districts, Mixed Use zones, and certain Planned Unit Development areas.
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Zoning codes and building regulations change frequently. Always verify current requirements with your local planning department and building authority before making any decisions.