With The Cranberries on hiatus from 2003–2009, Hogan turned to focus on his own music. He began working with programmer Matt Vaughan, who had already done work on unreleased Cranberries songs and Dolores O'Riordan's solo material. Mono Band was born with Noel as the sole band member. With vocals being supplied by Richard Walters, Alexandra Hamnede, Kate Havnevik, and other guest artists, Noel worked with Cranberries' veteran producer Stephen Street to compile a mix of twelve tracks. Working on his side project at the same time, saw their resulting debut album, Mono Band, released on 20 May 2005. Hogan and Mono Band vocalist Richard Walters went on to form Arkitekt. Arkitekt released two EPs at that time in 2009, working on new material,
Hogan's work independent of The Cranberries has been released on his own label, Gohan Records and is published through Fairwood Music (UK) Ltd for the world.
Hogan has also been producing bands on the local music scene of Limerick. Gohan Records has recently released, in collaboration with Limerick Live 95FM's Green and Live show, Tonelist, a collection featuring better-known and up and coming musicians in the Limerick music scene.