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TC Legend: 5-Star Zero Net Carbon Home

This two-story, 2,026 square foot, four-bedroom, Built Green® 5-Star certified home from TC Legend Homes sits at the base of Mount Si in beautiful North Bend. As with all TC Legend Homes, it is constructed from Structural Insulated Panels, ensuring an air-tight envelope with minimal thermal bridging. In addition to being Built Green certified, this home is ENERGY STAR v.3.2 and EPA Indoor airPLUS certified.

Vital Stats



Location: North Bend
Star Level: 5-Star 
Checklist: Single-Family/Townhome
Verifier: E.Coe Company
Site and Water 152
Energy Efficiency 242
Health and Indoor Air Quality 138
Material Efficiency 121
  Total Score 771.65


This North Bend net zero home is part of Built Green's group entry into the 20 by 2020 Building Challenge, a zero net carbon building challenge from Shift Zero, Passive House Northwest, the Northwest EcoBuilding Guild, the Housing Development Consortium, the Buillitt Foundation, and King County Green Tools. The 20 by 2020 Building Challenge aims to be a proof of concept that zero net carbon buildings can propel our shift to a carbon-sustainable future.

TC Legend Homes Built Green 5-Star North Bend home exterior
TC Legend Homes Built Green 5-Star North Bend home siding
TC Legend Homes Built Green 5-Star North Bend home solar equipment

Built Green Highlights

Site and Water

  • Orientation and window placement to optimize active and passive solar

Energy Efficiency

  • Slab on grade with 4” under-slab insulation
  • Insulated concrete forms
  • Triple-bead mastic and tape for air sealing of all joints
  • Triple-pane windows
  • High-efficiency air-source mini-split heat pump system for heating, cooling
  • High-efficiency heat pump hot water heater
  • ENERGY STAR refrigerator, dishwasher, and exhaust fan
  • 7.2 kW photovoltaic solar system (locally fabricated)
  • Energy Performance: Home Energy Rating System (HERS) index score of zero with solar PV (34 without PV)
  • Electric vehicle charging capable

Health and Indoor Air Quality

  • High-efficiency Heat Recovery Ventilator to ensure clean, balanced ventilation
  • .88 (ACH50) air infiltration rating
  • Zero-VOC paint

Materials Efficiency

  • A simple rectangular design to minimize exposed surface area
  • Structural Insulated Panel construction (locally sourced)

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