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      Current Home Building Options
  Strategy Green Certified Towards Zero Energy Passive House Standard
  Program GreenStar Certified / LEED Silver GreenStar Silver / LEED Gold GreenStar Gold / LEED Platinum / Passive House
  Energy Efficiency 50-60% more energy efficient 70-80% more energy efficient 90% more energy efficient
3-5% additional cost 8-12% additional cost 18-22% additional cost
  Structure ICF foundation, advanced wood framing double wall I-joists / SIP panels / ICF construction (50% increase in wall thickness) high performance wall system and insulation package
  Insulation foam in wall / attic, air sealing with cellulose (R-values: 25-30 walls, 45-50 attic) increase in insulation (R-values: 30-60 walls, 45-60 attic) increase in insulation (R-values: 60-70 walls, 90-100 attic)
  Mechanical sealed combustion furnace / hot water heater highly efficient furnace, solar thermal hot water heater passive solar, passive geothermal, modest mechanical system
  Doors / Windows Marvin Integrity or equivalent Loewen / Inline or equivalent German passive solar standard by Optiwin
  Appliances normal, typical EnergyStar (large selection) lower energy usage (smaller selection) lowest energy usage, very specific (restricted selection)