ADUs are allowed in GranbyTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Granby, CO
Is your property eligible for an ADU?
# of Properties
2,816
Owner-occupied
13%
Zoning districts
27
Avg Home Value
$455,444
Median Lot Size
0.19 acres
Avg Income
$77,316
Residential Types:
2,816 housing units
Single Family
40%
2-3 Family
1%
Apts (4+ units)
1%
Other
59%
Zoning Districts:
3,917 parcels · 27 districts
SV-R
22%(850)
SV-M
10%(410)
R-3
9%(347)
GE-SF
7%(292)
Other
52%(2,018)
ADU Rules
What can you build in Granby, CO?
Granby, 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
Detached ADU Size Limits
- –Maximum detached ADU size of 400 sq ft
Max Units
- –R-1 & R-2: 1 ADU/lot
- –CB: no per-lot max stated
- –All other districts: 0
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –1 space/ADU (on-site 9x20 ft). No max. Must front an alley or side-street access and have the space on-site; on-street parking cannot meet requirements; fees-in-lieu not allowed for residential uses.
Rental Restrictions
- –Short-term rentals prohibited; leases must be at least 90 days for all ADUs (detached or attached).
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.
Grand County