It is possible to elevate any building, including closed foundation types such as slabs on grade or stem walls. The elevation cost will be higher with closed foundation types than buildings with open foundation types such as piers, posts, pilings, or columns. The “50% rule for substantial damage” determines whether the building’s lowest floor is required to be elevated further. If the lowest floor of the home is currently below the required elevation (Base Flood Elevation shown on the flood insurance rate map at the link below, plus one foot of freeboard), the lowest floor of the building will be required to be elevated to BFE + 1 foot elevation if the building’s repair costs will exceed the 50% damage threshold. If the building, and all the utilities servicing the building, is already elevated above the BFE + 1’ elevation, the building is not required to be elevated to at least the BFE + 1’ elevation.