Maas Brothers Construction, Co., Inc., is one of Wisconsin’s oldest and most well-respected general contracting firms. Founded in 1922 by brothers Albert W. and Alvin (Ollie) Maas in Watertown, the growing construction business survived the Great Depression and thrived during the post-World War II construction boom. In the 1940s, Albert’s sons, Earl and Albert Jr., joined the family business. Together, they ran the company from 1949 until their retirement in 1990. Earl’s son, Robert Maas, took over management of the company in 1990. Today, as we approach the company’s 100th anniversary, Maas Brothers continues to grow and evolve in an ever-changing construction industry. Thanks to our longstanding reputation for providing quality construction work, many long-term clients—including some dating back to the 1940s and ‘50s—continue to choose Maas Brothers Construction.