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Siefken & Sons Construction was founded by Bill R. & Reta Siefken in 1975, along with their five sons, Richard, Scott, Jeff, Brian & Bill Jr. Beginning as a residential contractor, Siefken & Sons has evolved into the well-respected, quality commercial contractor that it is today. The company works within both the public & private sectors, maintaining close relationships with our clients to achieve their goals on every project. We recognize that success in the construction industry is defined not only by the construction process itself, but also the complete satisfaction and positive relationship built with our clients.