ADUs are allowed in BoulderTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Boulder, UT
Is your property eligible for an ADU?
# of Parcels
440
Zoning districts
5
Median Parcel Size
2.94 acres
Zoning Districts:
440 parcels · 5 districts
GMU
52%(227)
HDR
20%(89)
MDR
15%(64)
LDR
9%(41)
Other
4%(19)
ADU Rules
What can you build in Boulder, UT?
Boulder, UT follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: Conditional Use Permit
Detached ADU Size Limits
- –Maximum detached ADU size by zone: 1,000 sq ft in GM and LDR; 800 sq ft in MDR; 600 sq ft in HDR.
Max Units
- –1 ADU per primary dwelling (internal or external)
Owner Occupancy
- –Owner must occupy either the primary dwelling or the ADU
Rental Restrictions
- –Minimum rental term: ADUs may not be rented for fewer than 30 consecutive days.
- –Short-term rentals (1–29 nights) require a Residential Short-Term Rental CUP with limits: 182 days/year per lot; only one dwelling rented at a time; zones GMU/LDR/MDR/HDR; applicant must be resident/owner; max one RSTR property per owner.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other Utah municipalities
Rules change at the town line. Check the municipality your property is actually in.
Garfield County