Sain Associates, Inc. Share: Construction Management Sain Associates, Inc. Visit Website Two Perimeter Park South Suite 500 East Birmingham, Alabama 35243 (205) 940-6420 About Map About Sain Associates, Inc. is a full-service consulting engineering firm specializing in Traffic/Transportation Engineering and Planning, Infrastructure Design, Surveying, Site Design, GIS, and CE&I. What's Nearby? Distance: 5 10 15 20 25 50 mi.