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
- –MXU district: ADU floor area is capped at 50% of the principal dwelling’s gross floor area and further limited so total accessory floor area on the lot does not exceed 75% of the principal dwelling.
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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Learn the key rules and size limits for ADUs
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