ADUs are allowed in Fort MillTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Fort Mill, SC
Is your property eligible for an ADU?
# of Properties
10,484
Owner-occupied
85%
Zoning districts
26
Avg Home Value
$480,959
Median Lot Size
0.21 acres
Avg Income
$122,128
Residential Types:
10,484 housing units
RESIDENTIAL IMPROVED OC
100%
Zoning Districts:
11,266 parcels · 26 districts
MXU
38%(4,282)
PND
18%(2,015)
R-10
14%(1,571)
R-15
13%(1,472)
Other
17%(1,926)
ADU Rules
What can you build in Fort Mill, SC?
Fort Mill, SC 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
- –In MXU district, maximum detached ADU floor area is 50% of the principal structure’s floor area.
Max Units
- –MXU district: 1 ADU per lot
Owner Occupancy
- –Primary residence must be owner-occupied; ADU occupancy limited to owner's tenants.
Parking
- –0 spaces/ADU; no ADU-specific exceptions; general provisions allow shared/on-street parking and a 10% administrative reduction
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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Is your property eligible for an ADU?
ADU rules in other South Carolina municipalities
Rules change at the town line. Check the municipality your property is actually in.
York County