D.C. officials are considering moving school security in-house, after running into continual problems with contracting companies over the years.

The District’s auditor estimated Tuesday that 291 full-time guards would cost the city $11.4 million a year — less than the $18 million annual contract that U.S. Security Associates, which provides personnel at city buildings and public schools, holds with the District. The city also contracts with Securitas USA to patrol its public schools.