Fortress Builders established by William C. Sinnett in 2010. Bill is a retired Army Paratrooper and a disabled veteran. He started his real estate career upon retirement in 2001. Bill has worked in the new home building industry since 1999 prior to his retirement. Bill Sinnett and his business partner Tim Kern have over 30 years of building and real estate experience.www.fortressbuilders.net They have grown Fortress Builders from 2 homes in 2010 to one of the Top Ten builders in the Columbia SC Market. They closed over 25 million in sales for 2014.