The roots of Castle reach back to 1968. First, Charles E. Castle Jr. purchased the company, ACE Fire Extinguisher. Then, he grew it from a two-truck operation into one of the largest fire extinguisher companies in the United States. Meanwhile, his sons Chuck, Dan, and Patrick noticed a trend of people asking for help with fire sprinklers and fire alarms. They knew that people were looking for a one stop shop fire protection company, and were happy to oblige. In 2004, Chuck, Dan, and Patrick opened Castle Sprinkler and Alarm. Since then, Castle has become the most reputable and trusted fire protection company serving over 5,500 customers in the Northern Virginia, Washington DC, and Maryland areas.