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Howell Street

    • TC Legend Homes built this 788-square-foot accessory dwelling unit behind the homeowners’ existing house in Seattle, Washington, to the performance criteria of the DOE Energy Zero Energy Ready Home (ZERH) program.
    • The walls of this house are constructed using 6-inch structurally insulated panels with an insulation value of R-29. The seams of the panels are taped, and the cement board siding is caulked at all seams to prevent air leaks.
    • The triple-paned, vinyl-framed windows offer exceptional insulating values.
    • The 10-inch-thick SIP panel roof is fully covered with ice-and-water shield and offers a complete thermal, air, and water barrier to protect the home from the elements.
    • For increased energy savings, this home has ENERGY STAR appliances, advanced LED lighting, and water-saving plumbing.
    • Clerestory windows fill the home with daylight.
    • The entire home’s heating and cooling needs are met by one ductless mini-split air-source heat pump.

      Howell Street

      Project Address

      Seattle, WA

      Conditioned Square Footage
      788 sqft
      Number of Bedrooms
      1 Bed
      Number of Bathrooms
      1.0 Bath
      Number of Floors Above Grade
      1 Floor Above Grade
      Home Type
      Custom
      Climate Zone Temperature
      Mixed
      Climate Zone Humidity
      Marine

      With PV

      HERS Index with PV
      59HERS (PV)
      Average Monthly Energy Bill PV
      $60Average Monthly Energy Bill (PV)
      Annual Energy Cost Savings with PV
      $250Annual Energy Cost Savings (PV)
      30 Year Savings with PV
      $10,00030 Year Savings (PV)

      TC Legend Homes LLC

      ZERO

      HIA Year
      HIA Status
      Honorable Mention

      Learn More

      Key Features

      Key Features
      All-electric home Cold-climate heat pump Compact (core) plumbing design High-efficiency variable-speed heat pump Insulated concrete form (ICF) walls and/or foundation Structural insulated panel (SIP) walls or walls and roof Triple-pane windows Unvented insulated attic ACH 50 < 2.5 or CFM50/SF of enclosure ≤ 0.25

      Testimonials

      Video Testimonial

      Watch Videos

      Home owner (or occupant) Testimony
      Our houses are designed from the ground up to take advantage of the sun. A passive solar layout … means lots of windows facing south and few facing north. The long axis of the house is east to west to allow for maximized solar exposure for a future PV system and for passive solar heating.
      Testimony Citation
      Ted Clifton, builder, TC Legend Homes

      Additional Media

      Finished Elevations

        Finished Interiors

          Other Images

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            Floor Plan