All of the costs associated with developing land have gone up, it may depend on where as to how much. The septics I had done when i was building were in the $3500 to 5k range, I know they are more now here but dont know how much. Regs changes since the last time I did one.
My contractor contact in Az told me its far simpler to buy something already existing even a mobile, than getting all the permits squared away on a new construction. How much different depends on things like floodplain, how the soil perks, anf other factors. water availability can be an issue in some areas also, some places are limiting new building permits because they have no source of water.
Ive done the living far out on dirt roads, plenty of vehicle maintenance, rebuilding front ends etc repeatedly, having to drive to town in bad conditions for appointments or groceries or whatever, Im pretty tired of all that. Ive become soft and wimpy living in a town off and on the past few years and am willing to admit it. The majority of my so-called adult life has been doing that kind of thing, to include nomading. My nomading aspirations now are seasonal only, and I plan to camp comfortably when I do, and be where I want to be. If I can find an old fixer-upper mobile or shack of a house in the Verde in Az on a small lot thats not insanely priced, Ill be looking hard at it.