accessory dwelling unit

Bellevue Net Zero

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Design for a new single family house on a suburban lot at the end of a cul-de-sac. 4700 square feet, 5 bedrooms, 5 bathrooms, with a 600 square foot Accessory Dwelling Unit. A residential elevator will bring homeowners and guests up to the top level great room with its views to the southeast. Exterior siding to be stained cedar boards with rusty steel panels for an accent. Walls will be R-35 Structural Insulated Panels, windows will be triple glazed, and the roof has room for a huge 14kW solar array. This project is in the schematic design phase.

Wedgwood mother-in-law

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Constrained by zoning code, this project was only able to add 119 square feet of new footprint. So the homeowners gave a third of their existing family room to create a new Accessory Dwelling Unit for grandma to occupy. Connected by an interior door to the main house, but with its own exterior door for independent entry, the ADU allows the family to easily get together or remain separate as needed. This project in the schematic design phase.

Huff / Craven Net Zero House

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Design for a new net-zero-energy house including an airtight and superinsulated enclosure, heat recovery ventilation, and photovoltaic array.  Exposed beams in double height living room ceiling. Detached Accessory Dwelling Unit (DADU) wrapped in weathering steel with spiral stair inside.  Completed in summer 2018. 

Huppert remodel / addition

Located in the Fremont neighborhood of Seattle, this narrow, three story house has a magnificent view to the Olympic mountains.  The project added a two story Mother in Law (ADU) addition for a second family to rent. In between, a new skylit entry hall features a pond fed by rainwater from the addition roof.

Though similar in appearance to the main house, the ADU incorporates more progressive construction techniques than its 20-year-old parent.  ICF stem walls bear on footings of concrete mixed with 43% flyash.  Walls and roof structure are SIP insulated sandwich panels, and cement board siding is installed over a rain screen.

Heat is provided by a hydronic radiant slab below and a single fan coil unit above.  The roof gutters gather water in reused wine barrels for irrigating the yard.  The existing garage became a demonstration site for Seattle's eco-roof initiative.  Certified Built Green 3 Star.

Juneau Street short plat

Short plat to create four single family lots in Seattle.  Each lot has a 2-bedroom, 1-bath house over a full basement, a 1-bedroom, 1-bath Detached Accessory Dwelling Unit, and two surface parking stalls. 

The site had never been built, in part because it contained a steep slope and in part because it had no street frontage.  We connected two adjacent streets with a one-way driveway to provide vehicle and fire truck access.  The site layout groups the new buildings into two clusters to enlarge the apparent size of the private open spaces. 

The project received a master use permit, but was abandoned by the owner at the depth of the Great Recession.