ADUs are allowed in SiltTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Silt, CO
Is your property eligible for an ADU?
# of Parcels
1,732
Zoning districts
16
Zoning Districts:
1,727 parcels · 16 districts
PUD-R
39%(667)
R-2
22%(382)
R-1
9%(154)
PUD-C
8%(145)
Other
22%(379)
ADU Rules
What can you build in Silt, CO?
Silt, 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 of 1,000 sq ft for an internal or attached ADU
- –Maximum size of 50% of the primary dwelling’s floor area for an internal or attached ADU
Detached ADU Size Limits
- –Maximum size of 1,000 sq ft
- –Maximum size of 50% of the primary dwelling's gross floor area
Owner Occupancy
- –Owner-occupancy is not required.
Parking
- –2 spaces/ADU; must be on permanent surface with independent access and outside an enclosed structure; Downtown Commercial Parking District allows adjacent on-street spaces toward the requirement; off-site parking within 400 ft allowed if on-site provision is not feasible.
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.
Garfield County