ADUs are allowed in HaydenTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Hayden, CO
Is your property eligible for an ADU?
# of Properties
753
Owner-occupied
1%
Zoning districts
10
Avg Home Value
$540,177
Median Lot Size
0.18 acres
Avg Income
$101,570
Residential Types:
753 housing units
Single Family
94%
2-3 Family
1%
Apts (4+ units)
3%
Other
2%
Zoning Districts:
1,232 parcels · 10 districts
RLD
49%(601)
C
24%(293)
RHD
10%(118)
I-1
7%(83)
Other
11%(137)
ADU Rules
What can you build in Hayden, CO?
Hayden, 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 800 sq ft of habitable space for an internal or attached ADU
Detached ADU Size Limits
- –Maximum size of 800 sq ft of habitable space for a detached ADU
Max Units
- –Single-family: max 1 ADU/lot
- –Duplex & multifamily: ADUs not permitted
Parking
- –1 space per bedroom (up to 2 spaces per ADU); parking must be on the same lot, not in front/street setbacks; tandem parking not counted except in a garage or for approved affordable projects; street/shared parking substitutions do not waive ADU parking
Rental Restrictions
- –Short-term rentals must be licensed, located in the owner's primary residence, and stay under 30 days; no explicit long-term rental limits are 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.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs
Is your property eligible for an ADU?
ADU rules in other Colorado municipalities
Rules change at the town line. Check the municipality your property is actually in.
Routt County