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HyBrid Architecture: 4-Star Rowhouses

Posted on Jul 3, 2018 in:
  • Case Studies

In this rapidly growing neighborhood, design-build firm HyBrid Architecture & Assembly constructed rowhouses that help densify the area more than a standard rowhouse project. Rather than build a cookie-cutter set of rowhouses, HyBrid integrated an ADU space into the bottom level of each unit, adding a layer of “invisible density.”

ADUs are separate from the rest of the unit, allowing the owner to sublet or rent out the space. This approach tends to have lower costs and a quicker permitting process compared to larger, multifamily building types. Typically designed as a studio space with a kitchenette, ADUs also offer a method for affordable housing options, moderately increasing density, and the potential for aging in place.

Vital Stats



Location: Squire Park, Seattle
Star Level: 4-Star
Checklist: Single Family/Townhome New Construction
Verifier: Evergreen Certified
Site and Water 135
Energy Efficiency 88
Health and Indoor Air Quality 86
Material Efficiency 71
  Total Score 430


With a high-efficiency gas tankless water heater powering the in-floor hydronic radiant heat, HyBrid was able to free up space along the walls to integrate built-in cabinetry and shelving to allow for extra storage. Additional energy savings come from LED lighting with dimmers throughout the units, R-23 walls, R-50 ceiling, and Energy Star exhaust fans. The combination of drought-tolerant plantings and all-pervious hardscaping allows for some water to recharge on-site and minimizes the need to water plants.

The project features materials that are local, long-lasting, harvested from rapidly renewable resources, and boasts certifications for indoor air quality. The building is clad in corrugated metal, which typically lasts longer, requires less maintenance, and is made in Washington state. Each unit has GreenGuard-certified flooring and paint, as well as CARB II cabinets to help maintain good indoor air quality. As a rapidly renewable resource, the bamboo flooring reduces the overall impact on natural resource availability. The building also used regionally-made cabinets, windows, framing lumber, and pavers. 

Built Green Highlights

Site and Water

  • River rock retaining wall
  • 100 percent pervious hardscaping
  • Drought-tolerant plantings

Energy Efficiency

  • Full in-floor hydronic radiant heat (with built-in recirculation)
  • All LED lighting with dimmers
  • Full slab insulation
HyBrid Architecture Rowhouse Exterior
HyBrid Architecture Rowhouse Exterior
HyBrid Architecture Rowhouse Render

Health and Indoor Air Quality

  • Low-VOC paints, adhesives, and finishes
  • CARB II cabinets
  • Energy Star-rated exhaust fans

Materials Efficiency

  • Metal siding
  • Local materials (Abodian cabinets, windows, framing lumber, metal siding)
  • Bamboo flooring
HyBrid Architecture Rowhouse Construction
HyBrid Architecture Rowhouse Kitchen


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