Ask about the basement provision before buying a slab-only kit.
Leawood’s published residential code includes a basement provision for detached single-family dwellings, with defined exceptions in Section 4-939. That is a material early question for a barndominium concept drawn entirely on a slab. Have Code Services confirm how the current provision, exceptions and applicable state law affect your exact proposal before pricing the foundation. Do not assume either that a standard slab-only design will qualify or that an exception applies simply because a basement is not in the initial budget.
Official resources