Outposts generally begin as a dirt road to a single cargo container, cell phone antenna or water tower. Then houses are erected, but infrastructure typically remains rudimentary for the first residents. It is only when such additions as a community center, nursery school, playground area or paved roads emerge that an outpost begins to take on the characteristics of a settlement, though some settlement opponents consider any outpost with people living in it to be a settlement.
The "homes" are generally portable trailers. The one "outpost" that I've seen was on a hill just outside of Efrat and had about half a dozen trailers from what I remember. The first time I saw it there was a dirt road. About a year later it had been paved.
When the IDF takes the outposts down, it's not difficult for the settlers to put them back up on a different hilltop. That's the reason I personally don't appreciate why the outposts are such a major political issue ...
So how many of the 105 outposts that are said to currently exist actually have what WaPo quite reasonably considers "characteristics of a settlement"?