ADUs are allowed in OlatheTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Olathe, CO
Is your property eligible for an ADU?
# of Properties
630
Owner-occupied
23%
Zoning districts
8
Avg Home Value
$146,354
Median Lot Size
0.22 acres
Avg Income
$56,498
Residential Types:
630 housing units
Single Family
65%
2-3 Family
1%
Apts (4+ units)
2%
Other
32%
Zoning Districts:
815 parcels · 8 districts
R
54%(444)
M
21%(170)
C
12%(96)
P
6%(50)
Other
7%(55)
ADU Rules
What can you build in Olathe, CO?
Olathe, 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 1,000 sq ft or 50% of the principal structure’s floor area.
Detached ADU Size Limits
- –Maximum detached ADU size is 1,000 sq ft, but no more than 50% of the principal structure’s floor area (whichever is less).
Max Units
- –1 ADU per single-family lot; duplex and multifamily: none specified
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –1 space/ADU; space may be in existing driveway; Downtown: not required; TOD: Core within 500 ft of transit: no minimum, max 75% of required; Core (balance): min 50%, max 100%; Periphery: min 75%, max 120% of required.
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.
Montrose County