Slab foundation building in Bluffton SC - planned around your lot and flood zone

Start with your flood zone, because FEMA's coastal building guide says slab-on-grade foundations are prohibited in V Zones and not recommended for A Zones in coastal areas, since erosion can wash out a slab. The same guide prohibits fill as structural support in V Zones and bars using fill to raise a building in other coastal areas facing erosion, waves or fast-moving water.

Design it around the flood rules from the start, because FEMA's coastal guide says a foundation in a flood hazard area must use flood-damage-resistant materials, lift the building above the Base Flood Elevation, the flood level the area is mapped for, and keep it from floating, collapsing or shifting in the design flood. Locally, the Town of Bluffton's Building Safety office enforces the Flood Damage Prevention Ordinance, and Beaufort County Building Inspections enforces floodplain rules as well.

The city's Building Safety office runs the building permit process, and a permit is required to build, alter, repair, move or demolish a building or structure. Beaufort County Building Inspections issues permits for new construction, additions and substantial improvements, so ask which office covers your property address. Before we plan a job, we find out which one covers yours and what it asks for, and if a permit is part of the job we'll walk you through the application and work with the office on our end.

A contractor on a Bluffton permit needs a South Carolina license that covers the work in that permit, and the state's specialty rules list masons for poured-in-place concrete foundations such as reinforced slabs. Those specialty rules apply when the work done for a builder, general contractor or property owner runs over $500.

Before any concrete goes in, because the city requires an inspection before any part of the construction is covered up. For a slab, that means the inspector sees the work underneath first, so we set the pour date around that visit.

There's no fair number until I've seen the lot, because the price turns on the slab's footprint and thickness, how much base has to be dug out and packed, how much steel the design calls for and what your flood zone asks of it. A sloped or wet lot costs more to prepare, and a simple footprint on level, dry ground costs less. I'll put a figure on it after I've measured.