The Berkley house was built in California for $98,000 at 420 square feet (about $233 a square foot). The house features 6″ walls filled with recycled denim insulation. The house itself is actually a Net-Zero energy house and is powered by a 1.67 Kw solar system. Pair that with energy saving techniques like insulated pipes, efficient appliances etc, this house actually will produce more than it takes to run it.
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