Non-residential construction activity in the Seattle area stayed generally stable through the first half of 2026, even as cost trends diverged by market segment, trade and project type. A recent report from Mortenson finds that underlying conditions remain active enough to support ongoing building, but that the pattern of cost pressure is uneven across the region’s pipeline.
Mortenson reports that mega-project investments are the primary driver of upward pressure on construction costs in the area. Large, complex developments are continuing to move forward and are drawing significant interest from trade partners, which is helping to keep certain scopes busy and exerting selective pressure on pricing. At the same time, demand has softened in parts of the commercial and institutional sectors, opening the door to more competitive bidding for available work.
That softer demand in some segments has led trade partners to compete aggressively for projects. According to the report, many firms are actively pursuing the work that is on the street, and some are choosing to absorb market cost increases or trim their fees in order to secure contracts. This dynamic is contributing to a construction environment in which activity is still progressing, but margins and pricing strategies are under closer scrutiny.
Despite this heightened competition, Mortenson notes that pricing has continued to rise in several mechanical and specialty trades. Scopes such as plumbing, HVAC and fire protection showed increases during the most recent quarter, and those gains were significant enough to influence overall project costs. The resulting upward movement in these trades underlines the difficulty of fully offsetting material, labor or scope-specific pressures, even when bidders are sharpening their pencils.
Overall, Mortenson’s tracking shows that non-residential construction costs in Seattle rose 1.71% during the latest quarter. On a year-over-year basis, costs in the market increased 3.48% over the past 12 months. The report contrasts these results with the national trend, where non-residential construction costs increased 1.58% during the quarter and 5.60% over the same 12-month period.
The comparison indicates that while Seattle is seeing a slightly higher rate of cost growth than the national average in the most recent quarter, its annual increase remains lower than the broader U.S. figure. For owners, contractors and trade partners active in the Seattle area, the data underscores a market where competitive bidding persists but is increasingly challenged by selective cost escalation in key mechanical and specialty trades.
