ADUs are allowed in Crested ButteTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Crested Butte, CO
Is your property eligible for an ADU?
# of Properties
1,148
Owner-occupied
0%
Zoning districts
23
Avg Home Value
$1,627,254
Median Lot Size
0.14 acres
Avg Income
$87,235
Residential Types:
1,148 housing units
Residential
100%
Zoning Districts:
1,557 parcels · 23 districts
R1
15%(237)
R1C
12%(186)
R2
8%(129)
C
7%(107)
Other
58%(898)
ADU Rules
What can you build in Crested Butte, CO?
Crested Butte, CO 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: By Right
Interior / Attached ADU Size Limits
- –Maximum size is the lesser of 1,000 sq ft or two-thirds of the principal dwelling’s floor area; in R1A the cap is 1,200 sq ft or two-thirds, and in R2C internal/attached units are capped at 1,000 sq ft.
Detached ADU Size Limits
- –Maximum detached ADU size is the lesser of 1,000 sq ft (1,200 sq ft in R1A) and two-thirds of the principal building’s floor area.
Max Units
- –R1A/R1B: 1 ADU per lot; R2C: up to 2 ADUs per lot (1 via conditional use; second allowed on lots >6,250 sq ft)
Owner Occupancy
- –Owner-occupancy not required.
Parking
- –1 space/ADU for studio or 1BR; 2 spaces for 2–3BR; 3 spaces for 4BR; +1 space per 2 bedrooms over 4; stacked parking allowed only for spaces serving the same unit; off-street parking generally on the same or adjacent lot under same ownership; payment in lieu not allowed town-wide (B2 limited blocks 24–25); B3 pre-1990 residences exempt from off-street parking.
Rental Restrictions
- –ADU must be used exclusively as a long-term rental (min 6 months to a Qualified Resident), recorded against the property, actively offered, and not left vacant >3 months; short-term/vacation rentals prohibited.
- –If more than one ADU is approved, two of the three total dwellings must be long-term rentals.
ADU State Law
What can you build in Colorado?
- –ADUs must be approved based on objective standards; no discretionary hearings allowed.
- –Historic properties: Local historic review may still apply in designated historic districts.
- –Exempt parcels: ADUs are not required to be allowed on parcels without adequate water/sewer, in floodways, or on certain historic properties.
- –HOAs cannot prohibit ADUs: HOA rules that conflict with the state ADU law are void.
- –Parking exceptions exist: In rare cases, one parking space may be required if there is no existing off-street parking and on-street parking is prohibited.
- –Local rules still matter: Building code, fire code, utility capacity, and life-safety standards still apply.
- –More permissive is allowed: Municipalities may allow larger ADUs, multiple ADUs, or additional housing types beyond what the state requires.
- –Local zoning controls whether ADUs are allowed at all.
- –HOA rules may still apply.
- –More permissive local rules are allowed.
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 Colorado municipalities
Rules change at the town line. Check the municipality your property is actually in.
Gunnison County