Sletten Construction Company

Sletten Construction Company is an employee-owned general contractor founded in Montana in 1928, with corporate headquarters in Great Falls and offices in Nevada, Arizona, Wyoming and Idaho. The firm delivers work through general contracting, construction management, CM at risk and design-build, with a portfolio weighted toward public institutional projects across the Mountain West. In July 2026, Santa Barbara County supervisors voted unanimously to award Sletten a $138.65 million design-build contract for a 348-bed expansion of the Northern Branch Jail in Santa Maria, California, part of a project estimated at $167 million all in. Corrections work carries its own security electronics, detention hardware and sightline requirements.

Sletten Construction runs its work through specialized divisions – commercial, industrial, corrections, bridge, solar, inspections and virtual construction management – which lets one employee-owned firm move between a parking structure, a dam, an aviation facility and a solar installation. Founded in Great Falls in 1928, it has held a place among ENR’s Top 400 contractors for three decades and serves municipal, federal, state and private clients across Montana, Nevada, Arizona, Wyoming and Idaho. Delivery options span general contracting, construction management, CM-at-risk and design-build, so the firm can match its involvement to how a public owner wants to procure. Employee ownership tends to show up as continuity on long institutional projects.