ADUs are allowed in Unincorporated HinsdaleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Hinsdale, CO
Is your property eligible for an ADU?
# of Properties
1,234
Owner-occupied
18%
Zoning districts
13
Median Lot Size
1.10 acres
Avg Income
$75,972
Residential Types:
1,234 housing units
Single Family
64%
Other
36%
Zoning Districts:
2,533 parcels · 13 districts
RAD-1
44%(1,113)
URBAN-1
25%(634)
RAD-2
19%(473)
PIEDRA
6%(150)
Other
6%(163)
ADU Rules
What can you build in Unincorporated Hinsdale, CO?
Unincorporated Hinsdale, 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
- –Upper Piedra District: maximum internal/attached ADU size is the greater of 50% of the principal dwelling’s floor area or 1,000 sq ft, capped at 2,500 sq ft (single-family only).
Detached ADU Size Limits
- –In the Piedra District, a detached ADU may be up to the greater of 50% of the principal dwelling’s size or 1,000 sq ft, but not more than 2,500 sq ft.
Owner Occupancy
- –Occupancy limited to owners or on-site employees and their families
Parking
- –No min/max parking stated; in PUDs or common-interest projects, two off-street spaces per dwelling unit apply.
Rental Restrictions
- –Rental to unrelated tenants is not allowed.
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.
Hinsdale County