What would be better?

[Kevin Kong]

Hi I was wondering what would be the best way to prevent a house from flooding other than not buying a house in the flood zone.  There is a house in the north suburbs of Chicago in a amazing school district, but its in a flood zone 6/10.  From what i see they redid the house and it flooded about 17 inches on the house.  They cut out the dry wall and everything but from where i saw the mark on the walls it looks like 15-24 inches.  The house is on a concrete slab with no basement.  I was wondering if it would be better to pour cement to raise the entire living area of the house 15-24 inches a reasonable thing to do?  I figured if this was the worst flood they saw and it rose that much building a extra 15-24 inches of concrete wouldn't be too bad.  I was also thinking of putting the house on stilts but that looks to be super costly.  Also if i raised the floor i would also raise the roof.  All the windows and everything looks new still so i would be reusing those as well.  Im planning on buying this house fix it up and refinance it and BRRRRR my way to a early retirement.  Thanks for all the help