Technical essays, material studies, and regulatory guidelines from our structural exterior carpentry crew.
Seattle SDCI requires a permit for any deck more than 18 inches above grade, any roof deck, or any deck in an ECA. The threshold is different in King County, Bellevue, and Pierce. Here's the table.
Washington State requires 42-inch minimum guard height for residential decks — six inches taller than the IRC baseline. Here's why, what it changes structurally, and what it costs.
An in-depth technical analysis of why steep-slope and Environmentally Critical Area (ECA) parcels in Greater Seattle require engineered steel pin foundations over traditional concrete footings.