Deck Construction Permits in Charleston

Local Rule

City of Charleston Building Inspections Division

The city's own site plan guidance confirms that virtually all new decks in Charleston need a building permit: any deck attached to a residence needs one regardless of size, and even a detached deck needs one once it exceeds 200 square feet. Charleston publishes its own Residential Deck Detail Package with locally specific structural rules: an attached deck is capped at a 2:1 length-to-width ratio, and a freestanding deck with footings closer than 5 feet to an existing exterior wall must bear at the same elevation as the house's own footings. The city's own fee schedule charges a non-refundable $40 application fee on every building and trade permit, and decks in a historic district additionally need Board of Architectural Review approval before the building permit can be issued.

Source · Verified September 2026

Charleston Building Department

Hours and procedures can change — call ahead to confirm.

How This Compares to Charleston County

Charleston's own rule is shown above (Permit required). Here is the separate rule that applies at the county level, for context:

Charleston County Building Inspection Services

Charleston County (unincorporated areas) permits decks separately from other structures under the standard SC exemption, under 200 sq ft, under 30 inches, freestanding, no exit door. Distinctively, this is notably looser than the City of Charleston, which requires a permit for ANY attached deck regardless of size and for any detached deck over 200 sq ft, confirm whether a parcel falls under city or county jurisdiction, as the city's rule is stricter.

See the full county page

Nearby Cities with Verified Rules

Other cities near Charleston with a confirmed deck construction rule:

FAQs

Building It Yourself? Here's What You'll Need

Popular tools and materials homeowners use for a deck construction project:

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