What's the cheapest way to build a habitable dwelling on unimproved land?

Let’s say you’ve been able to purchase a couple acres of unimproved land, but near enough to other houses that you’re not entirely off the grid. What’s the cheapest way to set a structure on it (of no less than 700–800 sq ft) that would serve as a dwelling? We’re open to the ideas of kit houses, yurts, whatever, just so long as it’s habitable and can be wired for electricity, plumbed, and the like. Thanks!