I imagine you've seen some of the 10 "insanely" green sheds in a recent publication of Popular Mechanics. I read the article and was captured by the Eco-Shed, a structure that cost owner and author James Glave about $100,000 to build. With the help of Dan Parke of Salal Architecture, Glave put together an incredible low-impact writing studio. Check it out.
This 260-square-foot shed is located in Bowen Island, British Columbia, and was built with reclaimed or certified lumber, low-E windows, low-VOC paints, an R20 concrete slab, steel roofing, rainwater harvesting, and a 2,400 gallon cistern that irrigates Glave's organic farm.
Glave started out with a budget of $50,000, which he thought was pretty large, but it turns out he needed more. All this is discussed in his Thoreauvian book, Almost Green, which I intend to read in the near future.
Credits: James Glave.