4 ms·Seriously, how much would it cost per square foot to build an island?by brador 11y agoSeriously, how much would it cost per square foot to build an island?slayed0 11y agoI'm sure it would cost a shipload...ctdonath 11y agoMore a matter of cost per cubic foot. Have to find someplace where the seafloor is close to the surface, then dump enough volume of dirt on it to reach a viable altitude.