ADUs are allowed in LittletonTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Littleton, CO
Is your property eligible for an ADU?
# of Properties
14,776
Owner-occupied
79%
Zoning districts
26
Avg Home Value
$833,359
Median Lot Size
0.20 acres
Avg Income
$118,005
Residential Types:
14,776 housing units
Single Family
73%
2-3 Family
1%
Apts (4+ units)
3%
Other
22%
Zoning Districts:
16,723 parcels · 26 districts
MLR
27%(4,478)
MFR/PL-O
22%(3,722)
MLR/PL-O
15%(2,508)
SLR
10%(1,720)
Other
26%(4,295)
ADU Rules
What can you build in Littleton, CO?
Littleton, 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 up to the gross floor area of the principal dwelling; building coverage limits of the zone still apply.
Detached ADU Size Limits
- –Maximum detached ADU size is the lesser of 1,000 sq ft or the principal dwelling’s gross floor area.
Max Units
- –1 ADU per lot (any type; all principal structures)
Parking
- –0 min; 1 max per ADU; no new off-street parking required; tandem spaces allowed; ADUs within 1/4 mile of transit or in historic districts or in mixed-use developments require no parking; otherwise one off-street space is required only if: no on-site space exists, the zone requires parking for the primary dwelling, and the block prohibits on-street parking; any removed spaces must be replaced.
Rental Restrictions
- –Short-term rentals allowed but must comply with Title 3, Chapter 23.
- –Primary short-term rental in an ADU is prohibited if the property contains Overnight Accommodations or Group Living uses; inspection prior to licensing and an annual business and sales tax license are 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.
Arapahoe County