Founded in 1986 as Atlético San José Promesas it last played in Tercera División RFEF - Group 14, holding home games at Estadio Tomás de la Hera, with a 3,000-seat capacity.

[2] Founded in 1986, San José Promesas only started to have a senior team in 2004.

On 21 June 2016, the club was integrated into the structure of Extremadura UD and became its reserve team.

[3] With the aim to respect its history, the club would be named also as Extremadura-San José and will continue wearing its classic mauve kit.

In March 2022, Extremadura B was expelled from the Tercera División RFEF after two consecutive no-shows.