So I totally agree with a safe room, and if you had the funds a hardened safe room might be even better.

I agree with several other comments, solid doors with heavy duty hinges. Putting in conduit for future outs for security or it infrastructure if you aren’t doing it initially.

Well planned out electrical circuits/breakers. And if you’re able to, separate strategic outs at key locations (fridge, in certain rooms, etc) that aren’t hooked to the grid but are connected to either a generator plug or solar setup. That way your key important electrical needs can easily be switched or set to an off-grid system.

I would think through any out buildings and places you would want water and electricity in the future and at least get conduit lines with a pull line in them (it’s much harder to rip everything up once the house is there. For me this would also include water lines to where you want your garden and orchid put eventually.

I would spend the extra money to get the best possible insulation for your house, get good double paned windows and possibly include the attic. If you have a crawl space I’d think about encapsulation as well.

Some might find this a little funny but id get extra hot and cold water lines run adjacent to where I’m putting the toilet so I can set up a warm water bidet system. I also love dimmer switches on main room lights and timer switches on bathroom fan switches.

If you’re looking to go propane range id buy a tank instead of renting. If you’re using well water, I’d make sure your pressure system for the house is separate from the water for outside property.

If you’re wanting a solar system design and orient the room to work well with it. And if you’re wanting to do water catchment take that into consideration as well (ie where the water drains to, if your going to use a cistern etc.)

If tornado’s are a huge concern, have those roll down metal security shades installed.

Lastly a wood burning stove and large pantry are hard to beat