Behlen Building Systems. Sande Construction is a 3rd generation family-owned general contractor specializing in industrial, commercial, office, and warehouse construction. We are a Behlen Building Systems dealer and have been working with metal-framed buildings and standing seam reroofing for over 50 years. We take pride in our reputation for quality and in our understanding of the owner’s needs. By performing our own site work, concrete, masonry work, carpentry, drywall, plumbing, HVAC, and geothermal systems we are able to keep a firm grasp on costs, quality, and efficiency.