Solar power, a large battery, rain-water tanks, Starlink if out of town, a veggie garden, a heat pump for efficient heating and cooling. And a deck or widow's

Solar power, a large battery, rain-water tanks, Starlink if out of town, a veggie garden, a heat pump for efficient heating and cooling. And a deck or widow's walk on the top for stargazing (with a vibration-isolated telescope mount, if such a thing is feasible). In my part of the world people tend to build large houses on small blocks of land, leaving very little space for a garden (which is doubly stupid because the climate is so pleasant most of the year); I would do the opposite, and build a small, compact house to maximise the outdoor space.