Nonresidential construction costs in the Seattle region held largely steady through the fourth quarter of 2025, with overall escalation continuing to moderate in both the Seattle and Portland markets, according to a recent cost index report from Mortenson. The findings indicate that, while construction activity remains ongoing, the pace of cost increases has slowed compared with earlier periods of elevated inflation and supply chain disruption.
Mortenson’s Seattle regional office reported a modest quarterly cost increase of 0.30% in Q4 2025. Among the firm’s regional markets, Seattle and Portland posted the smallest quarterly cost movements, registering increases of 0.30% and 0.32%, respectively. This relatively low level of escalation signals a period of stability in input pricing across these Pacific Northwest nonresidential construction markets.
Within Seattle, material and labor costs were described as largely stable, with only minimal upward pressure. That stability contrasts with the sharper swings experienced earlier in the cycle, when supply chain constraints and labor shortages pushed costs higher at a faster rate. The current environment suggests that many of those acute pressures have eased, at least for now, even as some projects continue to move forward.
Construction activity across the Seattle region remained active but subdued over the quarter, with competitive bidding conditions emerging as a notable theme. Mortenson reports that a slowdown in several key demand drivers, including commercial office, higher education, and healthcare projects, has influenced the broader market. As activity in these sectors has cooled, trade partner availability has improved, intensifying competition for the work that is coming to market.
This increase in competition among contractors and trade partners has helped temper both labor and material cost pressures. With more firms pursuing a smaller pool of projects, owners and developers have seen tighter bids, which is contributing to the moderation in overall cost escalation. While the report notes that labor availability and supply chain conditions have generally improved across regions, it also cautions that selective challenges remain and can still affect the pricing and scheduling of individual projects.
Across all of Mortenson’s regions, the pattern is similar: conditions are more predictable than during the peak of recent disruptions, but localized labor dynamics and specific material categories can still create friction. In Seattle, however, the combination of modest cost growth, subdued but ongoing construction activity, and increased trade partner competition is defining the current nonresidential construction landscape heading into 2026.
