Zero Energy SIP House Coupeville WA

Location: Coupeville, WA

Project Information

Project Type: Residential, > 3,000 sq. ft.
Manufacturer: Premier Building Systems
Builder: Clifton View Homes
Design Professional: Clifton View Homes
Year Built: 2023


High Performance: Yes
HERS/EUI Index Score: 40
ACH50 - Blower Test Results:
CO2 lbs./sq.ft./year:

Awards/Certifications: DOE Zero Energy Ready Home, ENERGY STAR Certified, EPA Indoor AirPLUS


  • Layout: 4 bdrm, 4 bath, 2 fls, 3,289 ft2
  • Climate: IECC 4C, marine
  • Completed: January 2023
  • Category: Custom for Buyer


  • HERS Index: without PV 40
  • Annual Energy Costs: without PV $1,050
  • Annual Energy Cost Savings: (vs typical new homes) without PV $1,200
  • Annual Energy Savings: without PV 13,150 kWh
  • Savings in the First 30 Years: without PV $49,750


  • Walls: SIP walls, R-28 total: 6.5" graphite EPS, draining house wrap, fiber cement siding.
  • Roof: SIPs gable roof: 10.25" GPS SIPS, self-adhered underlayment on low-sloped 2/12 roof and valleys, synthetic underlayment on 8/12 roof. Standing-seam steel roofing for 2/12 roof areas and all future solar panel areas, 50-year composition shingles for all 8/12 pitch roof areas. Steel and single-ply PVC membrane over flat roof deck sections.
  • Attic: Unvented cathedral ceilings. R-46 SIPs; small utility attic for mechanical equipment.
  • Foundation: Slab on grade with 4" R-20 XPS on interior of stem wall and under full slab.
  • Windows: Triple-pane windows with U=0.16 and SHGC=0.34, vinyl-framed, argon-filled, low-e, interior motorized blinds.
  • Air Sealing: 0.52 ACH50; All SIP construction, seams caulked and taped.
  • Ventilation: Outside air ducts bring in fresh filtered air when range fan is running for spot or whole house ventilation. Also timered to open on summer nights for ventilation cooling.
  • HVAC: Air-to-water heat pump, 3.5 COP, for radiant heat and hot water. Air-to-air ductless minisplit for upstairs heat and all AC.
  • Hot Water: Air-to-water heat pump, 80-gal. tank, for domestic and radiant floor heat. Compact plumbing design, timered recirculation pump.
  • Lighting and Appliances: LED lighting; all-electric ENERGY STAR appliances.
  • Solar: None.
  • Energy Management System: Night vent cooling; passive solar design. Homes designed to run with no extra electronics.
  • Other: All systems energy modeled. PV sized to power home + 1 electric car. EV charger.

DOE project link:  Zero Energy SIP House Penn Cove Couperville WA

To explore other Zero Energy Ready Homes, visit the Department of Energy’s Tour of Zero page.


Affiliated Members

BASF Corporation

Houston, TX
Clifton View Homes

Coupeville, WA
Premier SIPS

Puyallup, WA


SIPA Website Sponsors