In 2024, 73% of new single-family homes started were built on slab foundations, according to NAHB analysis of the U.S. Census Bureau’s Survey of Construction (SOC). Although this was a modest year-over-year increase of 0.6 percentage points, it continues the upward trend in slab adoption, widening the gap between slabs and other foundation types. In comparison, basements (full or partial) accounted for 17% of new homes, while crawl spaces made up just 9.2%.