What matters for project planning
Preservation review governs exterior appearance and does not ordinarily reach an interior slab, so for this trade the relevant record is the flood map rather than the district rules. A ground-floor or garage slab on a parcel with mapped flood exposure has a history worth knowing before a coating is specified, because a slab that has taken water before will likely do so again and that predicts the moisture the coating has to survive. In some low-lying properties the ground level is not habitable space at all under the floodplain rules, which changes what the room can be used for and therefore what should be spent on its floor.
Official sources
Verify the property, not just the city
General citywide information doesn't establish a specific parcel's flood zone, historic designation, stream buffer, permit requirements, soil conditions, or what's hidden in existing construction. Confirm those specifics for your Charleston-area parcel with the right authority and your chosen provider before work begins.
Sources reviewed June 20, 2026. Flood maps and permitting requirements outside this page are subject to change.