Privacy from what? What's their threat model?

As of the time I’m writing this comment literally none of the suggestions made actually matter for the ambiguous goal of “general security and privacy” more than building in a neighborhood or community that meets the occupants desires.

Pick a place with people you want to be around who you trust to look out for you.

Hot take, but your local community matters infinitely more than the construction of your house. Build somewhere you have neighbors yoh get along with who will stick their neck out for you.

That being said, you can do the following:

• Plant/build near large trees to cover from satellite/aerial photography

• run conduit throughout so you don't have to rely on wireless networking

• install security cameras that feed somewhere local (I'm assuming nobody who breaks into your house gives enough of a shit to fins and destroy your recordings)

• buy actually good locks, doors, and doorframes. Make sure you're aware of what to expect from these, they wont actually keep someone out, they just make entrance louder and slightly more cumbersome.

• build a secret sex room for you and your spouse. This is less of a privacy asset, and more just a fun thing to do.

Consider low maintenance materials. Simple roof line, with good landscape drainage away from the house. Metal, ideally stainless steel roof. Triple pane metal clad or fiberglass windows choose by the sun exposure in terms of coatings. Heavily insulated. ERV ventilation. Consider commercial grade doors, and hurricane approved windows, etc. Consider unpainted stucco or another low maintenance exterior. Ground loop heat pumps for heating. Enough electrical capacity for all electric house including eV charging, but with backup power source. Design for no maintenance in the first 50 or 100 years. You might consider a safe room.

Edit: Might consider hidden and/or locked storage too, a locked filing cabinet at least, or a safe.

Edit: You might also consider a security, home automation, and house monitoring system but choose carefully. One that you control, not some cloud service.