He is the lead guitarist and backing vocalist for the band Good Charlotte, as well as pop rock collaboration The Madden Brothers.He formed both of these acts with his identical twin brother, Joel Madden. Madden started the fashion line called Made Clothing, along with his brothers Joel and Josh, but the line became defunct. A DCMA Collective store opened in Los Angeles on March 15, 2008, but later closed.As of September 2009 Madden has guest played in the band Taintstick, led by radio talk show host, professional MMA fighter, and pro skateboarder, Jason Ellis.

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In 2012, Benji appeared on the TV show The Voice Australia, alongside Joel as joint mentor-judges.

In early 2013, Benji helped write Tonight Alive's song "Breakdown".

In 1996 Madden started a band with his twin brother Joel named Good Charlotte. While still playing in Good Charlotte, Madden and Joel wrote and produced for other artists.

Madden was a co-writer and co-producer of some of the songs on Hilary Duff's Most Wanted (2005) compilation album.

‘They couldn’t have been in less of a party mood.’ The pair are said to have had difficulties for months, announcing to friends they've been having issues, and Cameron has been leaning on Nicole Richie – wife of Benji’s twin brother Joel – for help and advice to help her save her marriage.

A source added: ‘Cam thinks of herself as a wife – not a groupie.’ Another said: ‘Nicole’s trying to get Cameron to understand that these things come with marrying touring musicians.

He later helped write the songs "Amnesia" for pop rockers 5 Seconds of Summer and "No Ordinary Girl" for pop artist Kalin and Myles.

He has appeared as a back-up vocalist for artists such as Mx Px, Kill Hannah, Apoptygma Berzerk, Mest, The 69 Eyes, Sean Kingston, Three 6 Mafia, Chamillionaire, and Matisyahu.

Their brother Josh Madden helped to produce the mix-tape.

then Unknown Rappers, Machine Gun Kelly, Rockie Fresh, Kreayshawn, Cassie Veggies, HXLT, and Wiz Khalifa all appeared on the mix-tape.

But at the moment Cameron’s fed up and ready to walk out.’ Cameron has recently admitted she has found being married harder than she realised and acknowledged it takes a lot of work.