Subbasement
floor level below a basement
A subbasement, sub-basement or subcellar is a floor level below the main or uppermost basement level. Sub-basements are common in commercial buildings at high, dry altitudes but rare in houses.
A subbasement, sub-basement or subcellar is a floor level below the main or uppermost basement level. Sub-basements are common in commercial buildings at high, dry altitudes but rare in houses.