Inland, a full basement is normal. Here, it's rare — and it's not an accident of building style. It's the water table.

The ground is different

Along the bay, the lagoons, and the island, the water table sits close to the surface — sometimes just a few feet down. Dig a basement into that, and you've essentially dug a hole below the water line. It wants to fill. Keeping a basement dry in that ground is a constant, expensive fight, which is why builders here mostly didn't bother.

So what you get instead

Crawl spaces lift the house above the ground with room underneath — enough to run utilities and, critically, enough to give water somewhere to go without being in your living space. Slabs on grade pour the house directly on a concrete pad, common on the mainland. And on the island and in flood zones, homes elevated on pilings put the whole structure up on posts.

Why it matters for you

Each foundation type has its own failure mode. Crawl spaces battle humidity and standing water. Slabs crack and settle. Pilings face scour and salt. The moisture problems that dominate here — encapsulation, drainage, sump systems — exist precisely because of that high water table. Understanding what's under your house tells you what to watch for.

Not sure what you've got? "Not sure" is a perfectly normal answer on the intake form — a contractor will identify it when they come out.