ADUs are allowed in Mount Crested ButteTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Mount Crested Butte, CO
Is your property eligible for an ADU?
# of Properties
2,305
Owner-occupied
1%
Zoning districts
10
Avg Home Value
$1,096,110
Median Lot Size
1.03 acres
Avg Income
$87,235
Residential Types:
2,305 housing units
Residential
100%
Zoning Districts:
2,773 parcels · 10 districts
PUD
25%(687)
HDMF
25%(684)
BD
23%(648)
SFR
17%(458)
Other
11%(296)
ADU Rules
What can you build in Mount Crested Butte, CO?
Mount 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 1,200 sq ft and 1/3 of the total gross floor area (garage excluded).
Detached ADU Size Limits
- –Maximum size of 1,200 sq ft of gross residential floor area
- –Maximum size of one-third of the primary dwelling’s gross residential floor area
Max Units
- –SFR: 1 ADU or 1 efficiency unit/lot.
- –LDMF: If only 1 SF dwelling, 1 ADU or 1 efficiency unit/lot; otherwise 0.
Parking
- –1 space/bedroom (min 1) for ADUs; parking must be on the same lot; no off-site residential parking (guest parking allowed); PUD may modify.
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