Sometimes the greenest option for a space lies in the structure that's already there, or in this case, between existing structures. In a stunning feat of green living in a small area from Amenity Space, this London row house was built between townhouses that already stood there. Even at less than 16 feet wide, it boasts many an eco-conscious element - but wait, there's more.
From recycled building materials to a sedum roof, wool insulation to passive solar design, and more, this home is low on space but big on green. And guess what? The price tag isn't unheard of either; coming in at around $220,000, it falls in a more affordable spectrum than many townhomes with this much green street cred.
Find out more (and see many more photos) over at MNN.