Interserve has provided the BBC with security services since April 2014 when it was awarded the corporation's national security contract. This was a three-year deal to provide security services at properties across the UK. The account extension will start in early 2017.
Tom Ward, director of operations for security at Interserve, said: "We have a strong working relationship and have built up a track record of delivering outstanding service across a large and diverse portfolio. We look forward to continuing our work with the corporation for a further two years."