ADUs are allowed in WindsorTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Windsor, CO
Is your property eligible for an ADU?
# of Properties
21,992
Owner-occupied
86%
Zoning districts
32
Avg Home Value
$555,462
Median Lot Size
0.18 acres
Avg Income
$125,421
Residential Types:
21,992 housing units
Other
100%
Zoning Districts:
53,512 parcels · 32 districts
RMU-1
48%(25,518)
SF-1
25%(13,578)
RMU-1/PUD
13%(7,210)
ER
5%(2,935)
Other
8%(4,271)
ADU Rules
What can you build in Windsor, CO?
Windsor, 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 950 sq ft or the principal dwelling's living space.
Detached ADU Size Limits
- –Maximum size not larger than the living space of the principal dwelling unit
- –Absolute maximum size of 950 sq ft
Max Units
- –1 ADU per lot or parcel; duplex or multifamily lots not authorized (ADUs are limited to single-family detached dwellings).
Owner Occupancy
- –Owner must reside on the parcel at application submittal
Parking
- –Min 0; 1 space if on-street prohibited and on-site unavailable (as of Jan 1, 2024); tandem may count as existing space; required spaces must be paved (asphalt/concrete); max not specified.
Rental Restrictions
- –STRs require Town business license and permit; defined as 29 days or fewer. Only one STR license per property (ADU or main dwelling, not both). Active STR permits require the owner's primary residence to be either the principal dwelling or the ADU; covenants/HOAs may prohibit STRs.
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.
Weld County