Downloadable plans to build an ultra-low energy use home are now available for free on Phoenix’s website. Two years ago, the city launched a competition to attract sustainable home designs with the best potential for widespread adoption.

It has three-bedrooms, two bathrooms, an indoor laundry room, front patio and garage. At just under 2,200 square feet, the midcentury modern-inspired home is designed to fit a typical Phoenix lot.

Architect Marlene Imirzian recently told a subcommittee that window glazing and screens that residents can see through contribute to the low-energy use, along with a structural insulated panel system.

“And the simple methodology is, it’s like foam with a bunch, with wood on either side,” she said. “If you can appropriately insulate the perimeter, provide the appropriate level and protection of glazing, the actual amount of renewable power you require is shockingly small.”

Imirzian called the construction "simple" and said local supplies are experienced with the insulation process.

Cost was a key part of the city’s competition. The idea was to not only design a sustainable home, but also at a price that falls within the range for similar-size homes. The total cost, including contractor overhead is listed at $343, 814.

Phoenix rewarded Imirzian with $100,000 in grant funding from the U.S. Department of Energy. The first 10 homes that apply for a building permit using the plans in Phoenix will pay no permit fees. Free, downloadable blueprints are available here. Anyone who wants to access the plans must agree to indemnify the city and architect.

Sustainable Home Highlights

• 2,185 square feet
• Fits on a 60’ x 110’ lot with assumed setback lines
• Design is orientation neutral; works in any lot orientation
• 3 bedrooms
• Exceeds IRC 2012 code
• HERS score of 30, HERS score of 0 with Renewable energy

Cost and Affordability
Foundation: $28,160 (including slab insulation)
Framing: $72,430 (includes insulation per SIP panel)
Insulation: $18,840 (additional insulation; EIFS and built up roofing)
Fenestration: $10,898
Mechanical equipment and controls: $25,631
Total: $343,814 (including contractor overhead)