ADUs are allowed in AvonTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Avon, CO
Is your property eligible for an ADU?
# of Properties
3,749
Owner-occupied
2%
Zoning districts
23
Avg Home Value
$1,233,481
Median Lot Size
1.84 acres
Avg Income
$104,783
Residential Types:
3,749 housing units
Single Family
25%
Other
75%
Zoning Districts:
4,444 parcels · 23 districts
PUD
48%(2,136)
RHD
19%(836)
TC
18%(798)
RLD
7%(305)
Other
8%(369)
ADU Rules
What can you build in Avon, CO?
Avon, 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 for an internal/attached ADU is 600 sq ft
- –Maximum size for an internal/attached ADU is 33% of the principal dwelling's habitable floor area
Detached ADU Size Limits
- –Detached ADU (Backyard Cottage) maximum size cap of 600 sq ft.
- –Detached ADU (Backyard Cottage) maximum size of 33% of the principal unit's habitable floor area.
Max Units
- –Max 1 ADU per single-family lot
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –1 space/ADU; no max; on-street credit allowed; off-site parking allowed; principal dwelling parking required too (2 per SF, 3 if >2,500 sq ft)
Rental Restrictions
- –Short-term rentals (<30 days) allowed only if the property is in the Short Term Rental Overlay or approved in the Town Core STR area; STRs are not permitted in deed-restricted residential units.
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.
Eagle County