This seems to a new trend, a house just big enough for one or two people. I just sold my 2,000sf house because I only lived in half of it and heating costs have tripled. Here are some pics of one of these houses, factory-built by Breckenridge who make vacation trailers. The cost of this is supposed to be around $50K. Seems to be about 600sf.
http://home.earthlink.net/~jerry1784/micro/FP01.jpg (broken link)
http://home.earthlink.net/~jerry1784/micro/trailer1.jpg (broken link)
http://home.earthlink.net/~jerry1784/micro/trailer2.jpg (broken link)
http://home.earthlink.net/~jerry1784/micro/trailer3.jpg (broken link)
http://home.earthlink.net/~jerry1784/micro/c_deam_modern_trailer_4.jpg (broken link)
I'd would worry about solar gain in this, but they do have a screening system. Plus, you'd want to be careful to face these windows south or east, or have lots of trees. Also, there is no place for a washer and dryer. I wrote Breckenridge about putting them in the bathroom and getting rid of the media cabinet and they said it would be no problem.
Here's the architect's site, horrid flash, of course. Go to "show menu" then click on the square marked "Breckenridge".
http://www.cdeam.com/cdeam.htm
Here's the Breckenridge site:
http://breckenridgefinerliving.com/
This is a house I designed myself. I really like it a lot better:
http://home.earthlink.net/~jconrad607/squarehouse.jpg (broken link)
Living Size: 28'x24', 672sf
Living Rm 16-0x11-4 w 2-sided wood stove
Dining Rm 11-0x11-4 w corner hutch
Bedroom 11-0x11-4 w 2'x8' closet
Kit/laundry 8-0x11-4, w broom closet
Bath 5-0x8-0 w skylight
3'x5' utility area for water heater and furnace
Construction details:
Concrete slab floor, extending 4' outside (w thermal break)
2x6 stud exterior walls, 2x4 stud interior walls
Open-web custom-taper roof trusses, rigid insulation on top
Panel ceiling (removable for access to wiring, A/C, etc)
South glazing: three 8' sliding units, 4' roof overhang
East glazing: one 8' slider in BR, two 4' awnings in LR
West glazing: One awning window over sink
Vertical siding, wood or metal
4'x4' firewood storage area
4'x4' planter
Optional carport with 8'x8' storage shed