ASA Builders Supply was founded by Asa Shapiro in 1952. We are currently celebrating 55 years as the largest single trim and door shop in the Metro Detroit area. Our "Trademark of Quality" is synonymous with our long and rich history in Southeast Michigan. We have a large selection of Interior Doors and Bifolds, Mouldings, Stair Parts, Shelving and Custom Millwork all under a 55,000 square foot warehouse. Here at ASA, our staff strives to serve your needs. Come for our reputation for service, stay because of it.