ADUs are allowed in Unincorporated FremontTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Fremont, CO
Is your property eligible for an ADU?
# of Properties
11,948
Owner-occupied
63%
Zoning districts
21
Avg Home Value
$188,717
Median Lot Size
2.50 acres
Avg Income
$64,081
Residential Types:
11,948 housing units
Single Family
68%
Other
32%
Zoning Districts:
17,399 parcels · 21 districts
R1
36%(6,350)
R3
28%(4,910)
R2
23%(3,924)
LDR
9%(1,580)
Other
4%(635)
ADU Rules
What can you build in Unincorporated Fremont, CO?
Unincorporated Fremont, 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 1,250 sq ft for an internal or attached ADU
Detached ADU Size Limits
- –Maximum ADU size of 1,250 sq ft
Max Units
- –1 ADU per lot/parcel
Owner Occupancy
- –Owner must occupy either the primary dwelling or the ADU.
Parking
- –3 spaces total: 1 for the ADU + 2 for the primary dwelling; variances/off-site parking within 500 ft and alternate parking plans may be approved; waivers may be granted for certain ADUs.
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.
Fremont County