ADUs are allowed in Unincorporated RouttTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated Routt, CO
Is your property eligible for an ADU?
# of Properties
4,861
Owner-occupied
30%
Zoning districts
14
Avg Home Value
$1,550,443
Median Lot Size
5.15 acres
Avg Income
$120,022
Residential Types:
4,861 housing units
Single Family
98%
Other
2%
Zoning Districts:
10,997 parcels · 14 districts
AF
51%(5,604)
HDR
29%(3,179)
MRE
6%(702)
LDR
4%(457)
Other
10%(1,055)
ADU Rules
What can you build in Unincorporated Routt, CO?
Unincorporated Routt, 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 ADU size of 850 sq ft for 0–1 bedroom or 1,000 sq ft for 2+ bedrooms; increases to 2,000 sq ft on parcels of at least 70 acres.
Detached ADU Size Limits
- –Maximum habitable space: 850 sq ft for 0–1 bedroom; 1,000 sq ft for 2+ bedrooms. Note: up to 2,000 sq ft may be allowed on large lots or for historic structures (not modeled).
Max Units
- –1 ADU per single-family lot
- –Large parcels: total units capped at 1 per 35 acres (primary + secondary)
- –Duplex/Multifamily: none specified; ADU type (detached/attached/JADU): none specified
Owner Occupancy
- –Owner occupancy is not required for ADUs.
Parking
- –1 space/ADU; no residential max. Reductions allowed if within 0.25 mi of transit with sidewalk/trail connectivity; EV charging spaces count as two toward the minimum; shared parking reductions per Table 3.9.E-1 for qualifying mixed/shared lots.
Rental Restrictions
- –Short-term rentals (<30 days) prohibited for ADUs countywide in unincorporated Routt County; long-term renting allowed.
- –ADUs cannot host Bed & Breakfast or short-term lodging; B&B must be within the principal dwelling and owner-occupied.
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.
Routt County