Guest house for the cabin this is just under 500 square feet but the layout is really efficient. shows what can be done with minimal square footage. Add a covered porch, a finished shed for an office and a storage shed -- have a pretty cool set-up
"Granny flats" or backyard suites can provide all the charm of an East Coast house, with much less cost and maintenance - should be legalized in zoning code. These could also function as high-end vacation rentals.