Leandro Calm, the mayor of the city, founded the club as Unión Deportiva Llagostera on 13 November 1947. He also became its first president.[2]Llagostera spent most of its history in the Catalan regional leagues, promoting toTercera Divisiónfor the first time ahead of the2009–10 season.In only its second season at that level, the club won its group before defeatingCCD Cerceda3–0 on aggregate in thepromotion play-offs.[3]
In2011–12,its first season inSegunda División B,Llagostera finished only one point out of the play-offs, instead qualifying for the next season'sCopa del Rey,where it reached the last 32 before a 5–1 aggregate loss to giantsValencia CF.[4]The team was promoted to the professional leagues for the first time in 2014 with a 3–2 aggregate comeback win overReal Avilés[5]and beatingGimnàstic de Tarragonaafter the overtime in the last round of theplayoffs.[6]
As their stadium did not meet LFP criteria for home games, Llagostera had as its home stadium from 2014 to 2017 theEstadi Palamós Costa Brava,30 km from Llagostera, which holds 3,724 spectators. The club held its own in its first season inSegunda División,coming within four points of aplay-offberth. It was relegated back to the third tier towards after twoseasons.[7]
On 30 June 2017, the club announced it would come back to the Estadi Municipal de Llagostera.[8]One year later, Llagostera would be relegated toTercera División,after losing therelegation playoffsagainstIzarra,but bounced back immediately with victory againstClub Portugaletein June 2019.[9]
In the2020 Copa Federación de España,Llagostera emerged as champions following a 2–1extra timewin in the final. On 31 July 2021, the club announced the change of name toUnió Esportiva Costa Brava,moving to the city ofPalamósand changing the club's logo.[10]
On 19 July 2022, Costa Brava was absorbed byCF Badalona.As Badalona was relegated toTercera Federación,Costa Brava changed name toClub de Fútbol Badalona Futur,with the original Badalona acting as areserve team.[11][1]
^"Rami marca el gol de esta ronda desde el centro del campo" [Rami scores the goal of the round from the halfway line].Diario AS(in Spanish). 28 November 2012.