Castle Sprinkler and Alarm is a commercial fire protection company founded in 2004 and based in College Park, Maryland. It installs, inspects, tests, maintains and repairs fire sprinkler and fire alarm systems, and services kitchen fire suppression systems and extinguishers. It works on new construction and tenant improvements. Clients include multifamily properties, restaurants and office buildings in Northern Virginia, Washington DC and Maryland. It holds a Virginia Class A contractor licence (DPOR 2705085039) with the Fire Alarm Systems (FAS) specialty.