ADUs are allowed in MorrisonTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Morrison, CO
Is your property eligible for an ADU?
# of Properties
127
Owner-occupied
40%
Zoning districts
14
Avg Home Value
$813,396
Median Lot Size
0.33 acres
Avg Income
$122,740
Residential Types:
127 housing units
Single Family
4%
Apts (4+ units)
3%
Other
93%
Zoning Districts:
393 parcels · 14 districts
R1
26%(104)
HD
25%(99)
RE
13%(52)
MX-N
12%(46)
Other
23%(92)
ADU Rules
What can you build in Morrison, CO?
Morrison, 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 900 sq ft gross floor area for an Internal Accessory Dwelling Unit (In-Home Apartment); structured parking excluded from GFA.
Detached ADU Size Limits
- –Maximum detached ADU gross floor area of 900 sq ft town-wide.
Max Units
- –1 ADU per lot
Owner Occupancy
- –No owner-occupancy requirement; ADU and primary must share ownership.
Parking
- –1 space/ADU; max: none specified; HD district has no minimum; 1 additional off-street space for the ADU; 25% shared-parking reduction allowed within 500 ft if eligible uses share a lot
Rental Restrictions
- –Short-term rentals (<30 days) prohibited; no other ADU rental limits stated.
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.
Jefferson County