ADUs are allowed in Unincorporated DeltaTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Delta, CO
Is your property eligible for an ADU?
# of Parcels
10,173
Zoning districts
19
Avg Parcel Value
$352,753
Median Parcel Size
9.22 acres
Zoning Districts:
304 parcels · 19 districts
A-1
24%(73)
R-1
18%(55)
NZ
8%(25)
R-2
8%(23)
Other
42%(128)
ADU Rules
What can you build in Unincorporated Delta, CO?
Unincorporated Delta, 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 internal (in-home) ADU size equal to the square footage of the primary residence.
Detached ADU Size Limits
- –Maximum ADU floor area equal to the primary residence’s square footage.
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –2 sp/ADU; reductions may be granted via site-specific determination; residential spaces may be on driveways or gravel pads (except multifamily >4 units); ADA spaces count toward required; if a driveway serves a collector or higher-order road, vehicles must not back onto the road.
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.
Delta County