Home → Area Guides → Broomfield
Broomfield sits between Denver and Boulder — giving ADU rentals access to two of Colorado’s strongest job markets. Here’s how ADU rules work in Broomfield today.
| ADUs Allowed? | ✅ Yes — city-county under HB 24-1152 |
| Maximum Size | 1,000 sq ft or 50% of primary home area |
| ADU Types Permitted | Detached, attached, basement, garage conversion |
| Owner-Occupancy Required? | Not required under HB 24-1152 |
| Parking Requirement | 1 space per ADU |
| HOA Override? | HOAs cannot prohibit ADUs per HB 24-1152 |
| Short-Term Rental (STR)? | Broomfield STR permit required; verify ADU-specific rules |
| Permit Path | Administrative approval through Broomfield Community Development |
| Estimated Permit Timeline | 8–14 weeks |
| Official Source | City and County of Broomfield Community Development |
⟳ Last reviewed: October 2026. ADU rules change. Always verify current code with Broomfield before starting a project. View official source →
Broomfield is Colorado’s unique city-county hybrid and has virtually no ADU competition online despite its 74,000 residents and strong tech-corridor economy. The proximity to major employers in Superior, Louisville, and the US-36 corridor creates strong rental demand for ADUs. Broomfield handles both city and county permitting through a single department, which simplifies the process compared to cities where permits span multiple jurisdictions.
Not sure if your lot qualifies? The ADU quiz takes 3 minutes and gives you a personalized eligibility summary based on your property type, location, and goals. Take the free ADU quiz →
| Detached Backyard Cottage | $200,000–$370,000 |
| Garage Conversion | $52,000–$135,000 |
| Basement ADU Conversion | $40,000–$110,000 |
| Permit Fees (estimate) | $3,000–$9,000 (single city-county department simplifies process) |
| Utility Tap Fees (detached) | $5,000–$14,000 (Broomfield Water and Wastewater) |
| Estimated Monthly Rent | $1,700–$2,700/month |
| Estimated Break-Even | 7–11 years for detached; 3–5 years for conversion |
Local note: Broomfield’s single city-county permit department is a practical advantage — no coordinating between separate jurisdictions. Strong rental demand from the US-36 tech corridor keeps occupancy rates high.
Cost ranges reflect 2026 Denver metro construction pricing. Individual project costs depend on site conditions, finishes, utility distances, and contractor selection. Get multiple bids before committing to a budget.
Official Sources
Rules and fees change. Always verify current requirements directly with your local jurisdiction and utility provider before starting a project.
Answer 7 questions to see your estimated cost range, likely ADU type, and local eligibility — free, no sign-up required.