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Heartwood Workforce Housing

Seattle, WA
  • Bldg system

    Mass Timber

  • No. Of Stories


  • Sq. footage


The eight-story project is the first IBC Type IV-C workforce housing project permitted in the United States. The project exposes the CLT ceilings and glulam column and beams within the units, hallways and lobby, along with two Mass Plywood Panel (MPP) exit stairs. 126 studio and 1-bedroom units are provided, and the building includes an outdoor amenity courtyard, bike parking, retail, laundry. Led by architect atelierjones, the project was completed in Dec. 2023 for owner, Community Roots Housing. With Skipstone, Linage, DCI, TimberLab, Swinerton Construction and a fully integrated team using extensive Building Information Modeling (BIM) for prefabrication of all Mass Timber elements. Supported by a 2019 USFS grant.

This video explores the creation of 2-hour rated glulam beam-to-column connections on Heartwood, the 8-story Type IV-C building in Seattle, WA. Hear from project team members about the design, fabrication, and construction process they undertook to blend traditional joinery techniques with cutting-edge mass timber fabrication advancements. Featuring Adam Jongeward, PE SE; DCI Engineers; Taylor Cabot and Lauren Magasko, Timberlab.

  • Construction Cost:

    $29 million

  • Construction Type:


  • Building Type:

    Multi-Family (Apartments, Condos)

  • Material Types:

    Mass Timber, Cross-Laminated Timber (CLT), Glue-Laminated Timber (GLT or glulam), Structural Composite Lumber (e.g. LVL and LSL)

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