What size home would you need?

[Scythe13]

I'm not looking to downsize or relocate.

Got thinking about what kind of home to build on a certain plot of land, and it got me thinking about what minimum size it would need to be. Then I got thinking about all kinds of different things, so just thought I'd ask and see what other people have done and what things they considered.

Being nearly 30, and only a few years away from being mortgage free...no plans on going up or down in house size.

Good considerations though TOF. WTSHTF, would kids be an option or would they be inevitable? In which case, if inevitable, then any survival home would need to take that into consideration too.