The new contract will see Red Bee Media, previously BBC Broadcast, deliver more than 60,000 hours of access services per year to BBC channels and networks.
Red Bee's Access Service team is claimed to be one of the biggest of its kind in world, providing vital tools for the hearing and visually impaired to watch television.
It has contracts with broadcasters in the UK, France, Germany, Spain and Australia. The new BBC deal was awarded after a competitive tendering process.
David Padmore, the director of access & editorial at Red Bee Media, said that the company has a "long and positive history" of working with the BBC, and he is "delighted" that the relationship will continue for the next seven years.
"We believe that TV should be accessible to everyone and we're proud to work with the BBC to deliver the highest quality subtitling, audio description and signing services to the British public nationwide," said Padmore.
"Red Bee Media is a pioneer in the innovation of access services and we remain committed to investing in and developing new technologies to ensure we continue to provide our clients and their audiences with the very best, industry-leading services."