Crawl space
ENCLOSED SPACE BELOW A STRUCTURE THAT IS TOO SHORT TO STAND ERECT IN
Crawl Space; Crawl space (basement); Crawlspace
A crawl space is an unoccupied, unfinished, narrow space within a building, between the ground and the first (or ground) floor. The crawl space is so named because there is typically only enough room to crawl rather than stand; anything larger than about and beneath the ground floor would tend to be considered a basement.