Home / Journal / Mass Timber Architecture in Seattle: CLT, Glulam, and the Case for Wood
May 30, 2026
Mass Timber Architecture in Seattle: CLT, Glulam, and the Case for Wood
Mass timber — structural wood panels, beams, and columns engineered for strength — is experiencing a renaissance in Pacific Northwest architecture. Seattle is at the center of this movement, with several notable mass timber buildings completed or under construction. Here is what homeowners and developers should know.
What Is Mass Timber?
Mass timber refers to engineered wood products used as structural elements:
CLT (Cross-Laminated Timber):
Panels of wood layers glued in alternating directions. Used for floors, walls, and roofs. Comparable in structural performance to concrete slabs.
Glulam (Glued Laminated Timber):
Beams and columns made of laminated lumber. The workhorse of heavy timber construction.
DLT (Dowel-Laminated Timber):
Panels assembled without adhesives using hardwood dowels. Strong acoustic performance.
LVL (Laminated Veneer Lumber):
High-strength beams for concentrated loads.
Why Seattle Is a Natural Fit
The Pacific Northwest’s abundant sustainably harvested timber, deep carpentry tradition, and strong sustainability culture make mass timber a natural material choice. Seattle has been an early adopter — several CLT office buildings in South Lake Union, mixed-use projects in Capitol Hill, and residential towers elsewhere in the region demonstrate the material’s versatility.
Mass Timber for Residential Projects
Mass timber residential applications include exposed glulam beams in Northwest Contemporary homes, CLT panels for roof structures, and heavy timber framing for large custom homes. The exposed wood aesthetic is highly valued in the Seattle market.
Cost Premium
Mass timber typically carries a 10-20% premium over conventional wood framing for comparable structures. The premium decreases on larger projects and is often offset by faster construction (prefabricated panels), reduced labor, and no need for interior finish materials over structural members.
Piper Cole Architects has experience with mass timber residential design. Free consultation — call 425-753-6452.
Related guide: Wood vs Steel vs ICF: Choosing a Structural System.
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