Since 1979, 4-Square Builders Inc. has been your full service lumber yard. A diversified company with knowledge in building materials, new homes, remodeling, agricultural and equine. Post frame buildings. If you are a "do-it-yourselfer" or looking for a turnkey project - 4-Square Builders is your full service lumber yard with design-build services, making any project a reality. Construction consulting, genreal contractor, building material sales.