ADUs are allowed in FriscoTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Frisco, CO
Is your property eligible for an ADU?
# of Parcels
3,859
Zoning districts
19
Avg Parcel Value
$1,200,008
Median Parcel Size
0.12 acres
Zoning Districts:
3,859 parcels · 19 districts
RM
21%(804)
RH
20%(762)
MU
12%(482)
CC
12%(460)
Other
35%(1,351)
ADU Rules
What can you build in Frisco, CO?
Frisco, 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 900 sq ft for an internal or attached ADU
Detached ADU Size Limits
- –Maximum size of 900 sq ft for any accessory dwelling unit.
- –For a detached carriage house, maximum of 50% of the principal dwelling’s floor area, capped at 1,000 sq ft.
Max Units
- –1 ADU per principal dwelling unit or per commercial unit; 1 carriage house per primary residence
Owner Occupancy
- –Owner occupancy not required.
Parking
- –1 space/ADU (townwide); CC/MU West Main: 1 space per Studio/Accessory Unit; max 4 spaces per residential unit in CC/MU West Main; RN and Carriage Houses: spaces cannot be stacked with primary-unit spaces; 1 visitor space per 5 units in CC/MU West Main.
Rental Restrictions
- –ADUs may not be used for short-term rental housing.
- –Detached carriage houses may be density-exempt only if permanently deed-restricted for rent to persons earning up to 80% of AMI.
- –In RL, RM, RH, GW, CC, and MU districts, ADU density exemptions require deed-restriction for rent to persons earning up to 100% of AMI.
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.
Summit County