Magnum Builders was incorporated by Douglas W. Baltzer in 1983. In 1988, Michael L. Baltzer joined the firm as Vice President and Magnum Builders expanded into the Public Construction Market.

In 2009, Clint Riley joined the firm as Magnum’s new Chief Estimator, he came from a larger construction company with a strong background in pre-construction services in all types of projects including condominiums, education, institutional, and heavy commercial. In 2014, Clint Riley became Vice President and Partner of Magnum Builders.

Magnum Builders has been servicing the Southwest Coast of Florida since 1983.