Case Study
Vital Stats
Location: North Seattle
Star Level: 5 Star
Checklist: Single Family / Townhome
Square Feet: 1,690
Section Points
Site and Water 130
Energy Efficiency 166
Indoor Air Quality 145
Material Efficiency 115
House Size Multiplier 1.1
Home Total Score 611.6

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Caladonia Bay Builders and Marshall Rose Architect

This month’s featured home is a 5-Star single family home in North Seattle designed by Marshall Rose, Architect and built by Caladonia Bay Builders. The home started with a careful deconstruction of the existing home on the property. The site plan included a comprehensive infiltration strategy including rain gardens and a green roof on the garage. The design of the building incorporated a strong energy strategy complemented by a 3.5 KW solar photovoltaic array, a solar hot water system and hydronic heating powered by a 93 to95 percent efficient boiler. Caladonia Bay Builders re-milled the framing from the previous home on the site into trim for the new home, and used FSC-certified wood for the new wood in the home. To improve indoor air quality, radiant heating was used throughout the home, no carpet was used and the garage was detached from the home. Finally, at less than 1,700 square feet, the home is much smaller than the King County average for single family homes.

Some of the many green features include:

Site and Water Protection

  • Home was built on an infill lot
  • Green roof used on garage
  • Rain gardens used extensively on property
  • Amended soils depth to 12 inches
  • No turf grass used on property
  • Use of drought tolerant plants as landscaping
  • Use of rain barrels to collect rainwater
  • Installation of dual flush toilets in the home
  • Home is within ¼ mile of a public transit stop

Energy-Efficiency

  • Estimated 49 percent reduction in whole house energy use based on energy modeling
  • Designed for solar heat gain
  • 3.5 KW Solar photo-voltaic system to assist in power generation
  • Solar hot water system designed to provide at least 40 percent of home’s hot water needs
  • Entire home heated by hydronic system with 93 to 95 percent efficient boiler
  • Blower door test showed air changes per hour (ACH) at less than 0.25
  • Used on-demand hot water heating inside the heated space
  • Solar powered outdoor lighting
  • Energy Star® appliances throughout

Material Use

  • Existing home de-constructed and framing lumber re-milled as trim for new home
  • Use of FSC-certified wood products for dimensional lumber, beams, sheathing, and flooring
  • Concrete used contained at least 25 percent by weight of fly-ash or blast furnace slag
  • 50-year siding product used
  • Use of recycled content composite countertops
  • Home contained no vinyl in windows, flooring, siding or plumbing
  • Installed a metal roof
  • Preserved existing foundation walls

Indoor Air Quality

  • No carpet used in remodel or addition
  • Hydronic heating system used throughout home, so no forced air
  • Use of low VOC paints and adhesives on all surfaces
  • Installation of a rain-screen system to protect home from water intrusion
  • Formaldehyde-free cabinetry, trim and insulation
  • Implemented healthy jobsite operation plan including use of low-toxic cleaners, mitigation of construction dust and cleaning of duct and furnace before move in
  • Protection of exterior building components from moisture damage
  • Extension of roof overhangs to at least 24 inches
  • Central vacuum system
  • 3-way waterproofing system in basement
  • Cross and vertical ventilation

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