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Lakesideca News

A Passivhaus Take on Multifamily

A nine-unit townhouse project in Seattle will include an HRV for each unit as well as PV-ready wiring

Image 1 of 3
Multifamily on a hill. Townhouses planned for Urban Olympic, a nine-unit development in Seattle. All nine homes are designed to meet the Passivhaus standard.
Image Credit: CAST Architecture (images 1 and 2); Department of Planning and Development, Seattle (image 3)

Seattle’s Department of Planning and Development recently revised its approach to multifamily housing. Approved in December and implemented on April 19, 2011, the for low-rise residential projects represents the first such update since the late 1980s.

It also puts particular focus on townhouses, which have grown in popularity as home prices in the city climbed.

In a list of highlights, for example, the planning department notes that, for new townhouses, “at least 20% of street-facing facades must be windows and doors, building materials must be varied, townhouse parking garages must be designed to fit large cars.” In addition, “streamlined design review” will be required for townhouse projects of three or more units (but not for row houses, cottages, or apartments in the city’s multifamily zones). The code also provides incentives for green building and hiding parking underground or at the back of the lot.

Meeting code, and then some

One multifamily development designed to reflect the new design-oriented rules – and dig deep into the code’s green building provisions – is , whose nine high-end units will be built to meet the Passivhaus standard.

Matt Hutchins, principal at CAST Architecture, based in Seattle, is lead designer on the project, which he says will include five townhouses and, behind them, two duplexes. Interior space will range from 1,784 to 1,867 sq. ft., and each unit will include three bedrooms and two and a half baths. Because of the shape and orientation of the sloped lot, the back of each unit will face south.

Hutchins says that CAST still has to make final decisions about R-values and window and door details, but he noted that each house will be pre-wired for photovoltaics and, beyond the heat-recovery ventilators that will be installed in each unit, optional heat sources will be offered to prospective buyers. The estimated price range is $725,000 to $900,000.

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