ADUs are allowed in SummervilleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Summerville, SC
Is your property eligible for an ADU?
# of Properties
1,230
Owner-occupied
91%
Zoning districts
51
Median Lot Size
0.15 acres
Avg Income
$78,812
Residential Types:
1,230 housing units
Single Family
98%
Other
2%
Zoning Districts:
20,049 parcels · 51 districts
PUD
56%(11,137)
GR-5
20%(3,983)
GR-2
7%(1,312)
N-R
3%(690)
Other
15%(2,927)
ADU Rules
What can you build in Summerville, SC?
Summerville, 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
Interior / Attached ADU Size Limits
- –Maximum ADU size is 50% of the gross floor area of the primary building.
Detached ADU Size Limits
- –Maximum size of 50% of the gross floor area of the primary building
Max Units
- –N-R, N-MX, GR-2: 2 ADUs per lot; GR-3, GR-5, MF-R, MH-R: 1 ADU per lot
Owner Occupancy
- –Primary dwelling must be owner-occupied; ADU must share ownership.
Parking
- –1 space/ADU minimum; max 2 off-street spaces/ADU. On-street spaces adjacent to the lot frontage may count toward the minimum; if on-site parking cannot be provided, it may be located off-site within 800 ft.
Rental Restrictions
- –Primary dwelling must be owner-occupied; ADU must share ownership with the primary dwelling; renting both units simultaneously is prohibited.
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 South Carolina municipalities
Rules change at the town line. Check the municipality your property is actually in.
Dorchester County