I Guess it would all depend on how your spacship worked. The Saturn V rocket boosters are a couple of meters accross and it had five of these so you'll need a big garden just to house them, then theres the heath and safty aspects of having enough explosive fuel to flatten a small town ..... and if your using hydrazene then theres the toxic aspect as well while your storing it. But I suppose if you have a non- toxic, quiet and small spacship with no fuel problems you would just need a certificate of air worthyness to prove its not going to land on nextdoors house, and away you go.