Hewitt was born in Northwich, Cheshire, England and attended Weaverham High School. Hewitt has a daughter and had a second child in early 2010. His elder daughter Emily performed backing vocals on Love Song, the final track on Love Amongst Ruin's 2010 debut album.
Hewitt was inspired to become a drummer after watching Phil Taylor performing Ace of Spades with Motörhead on Top of the Pops. He "hassled" his parents to get him a drum kit and when they did, he taught himself to play. Hewitt also acknowledges drummers Phil Rudd (AC/DC) and John Bonham (Led Zeppelin) as influences. Hewitt was musically active at school, drumming and putting on performances. He lists some of his influences as The Cure, Depeche Mode, The Smiths, AC/DC, Black Sabbath, Thin Lizzy, Led Zeppelin, Jimi Hendrix, Radiohead and Can. He recalled that his family "loved music" and driving on caravan holidays in the car would be punctuated by the sounds of Bee Gees, Elton John, ELO and The Beatles.
Hewitt worked as a picture framer before leaving school and upon leaving school he began training to be a race car engineer. He progressed to be offered an opportunity to continue his training with Williams and worked on the team's pit crew. He also worked as a sign writer until deciding to pursue music full-time.
Hewitt began his career in the northwest of England, playing with his brother Nick in Misadventure, before leaving in 1988 to join The Mystic Deckchairs. Hewitt joined fellow local musician Tim Burgess in Electric Crayons, prior to Burgess joining The Charlatans in 1989. Hewitt joined Breed at the age of 17, linking up with the band for a German tour after spying an advert placed by the band in Affleck's Palace. Following the completion of the tour, Hewitt joined The Boo Radleys on a temporary basis and played on the band's 1990 debut album, Ichabod and I. Hewitt rejoined Breed in 1991, releasing the albums Grin in 1991 and Violet Sentimental in 1993. Breed found commercial success elusive (despite a support slot on Nick Cave's Let Love In tour) and following a disastrous gig at the Bull & Gate in London in 1996, the band split. While in Breed, Hewitt also played for house act K-Klass. The need for money during these years saw Hewitt take on session work in London, recording jingles and appearing on releases by Baby June and Sharkboy. Breed reformed for a one-off gig at Lock 17 in Camden Lock Market, London on 6 December 2004.
Hewitt met Brian Molko in 1991 through his then-girlfriend and was invited to drum on demos for Molko's band Placebo, though Hewitt wasn't able to join the band due to commitments to Breed. The band earned a record deal with drummer Robert Schultzberg, who appeared on the trio's 1996 debut album. In the autumn of 1996, tensions between Schultzberg, Molko and bassist Stefan Olsdal saw Schultzberg leave the band. Breed's breakup around the same time saw Hewitt accept the invitation to join Placebo permanently. Hewitt appeared in the video for the band's 1997 "Nancy Boy" single with his face blurred out, because he was still under contract to a different record label. After completing touring for Placebo, the band wrote and recorded their second album, Without You I'm Nothing, released in October 1998. The first official Placebo release to feature Hewitt was the "Pure Morning" single, released in August 1998. Hewitt drummed and contributed to the songwriting on subsequent albums Black Market Music (2000), Sleeping with Ghosts (2003) and Meds (2006) with the band. On 1 October 2007, it was announced via the official Placebo website that Hewitt had parted company with Placebo due to personal and musical differences. Hewitt's final recorded performances for the band were the b-sides "Lazarus" and "UNEEDMEMORETHANINEEDU", released on the "Meds" single in October 2006. Hewitt was replaced in 2008 by Steve Forrest, the band's first right-handed drummer.
Feeling "betrayed" after leaving Placebo and faced with a decision "to go to the pub or the studio", Hewitt returned to his home studio and began creating "a new band, a new album and a new sound". He contributed drums, guitars, piano and lead vocals to the album and enlisted Jon Thorne and Donald Ross Skinner as collaborators. Steve's brother Nick Hewitt recorded additional guitars and Hewitt felt that he had captured his best ever drum sound on the album. The band was named Love Amongst Ruin in late 2009, with Hewitt assuming frontman duties. Hewitt made his first public appearance since leaving Placebo on 14 January 2010 at Eurosonic Festival in the Netherlands at the band's debut gig. Love Amongst Ruin's self-titled debut album was released on 13 September 2010. The band embarked on UK and European tours during 2010 and 2011, making appearances at Sonisphere Festival, Reeperbahn Festival, Fête de la Musique and supporting Feeder on their February 2011 UK tour. Hewitt wrote and recorded the band's second album Lose Your Way with Donald Ross Skinner in 2011 and 2012, before the album was put onto the back burner until being released on 27 June 2015.
Hewitt befriended members of the band Six by Seven when they toured as opening act for Placebo in 1998. In 2012, Hewitt and Six by Seven frontman Chris Olley were reintroduced by mutual friend Steve Hove (then-guitarist for Love Amongst Ruin) and began rehearsing new material for Olley's project (The Death of) Six By Seven. The material they wrote eventually saw the project morph into a reformed Six by Seven. Hewitt was announced as the band's new drummer in August 2012. The band entered Moles Studio in Bath in January 2013 to record the band's seventh album. Olley stated that Hewitt "won't do more than what sounds good. So if the first two songs on the album have no snare, he's gonna put all his efforts into playing the bass drum and ride. He does what all great drummers do, adds to and supports the songs". The album, titled Love and Peace and Sympathy, was released on 16 April 2013 and the band embarked on a UK tour in the middle of 2013, which included a slot at Glastonbury Festival. Hewitt's year was ended by a broken arm suffered in October 2013, which caused him to miss an in-store signing at Fopp in Nottingham and a performance at Soundedit Festival. Chris Olley reported on his blog in May 2014 that he had recorded a new Six by Seven album by himself, hinting that Hewitt had left the band.
In 2010, Hewitt joined songwriter/producer Brandun Reed as a collaborator on Reed's Polaroid Kiss project, playing on The New Coliseum expanded album (2013) and the Youth album (2015). As of May 2015, Hewitt was recording and producing pop singer DéDé and recording drums for Paul Draper's solo album.
Hewitt served as one of the producers for Love Amongst Ruin's debut album and brought in Paul Corkett to co-produce the album. Corkett had previously worked with Hewitt as the producer on Placebo's Black Market Music. While touring Love Amongst Ruin's debut album, Hewitt struck up friendships with French and Italian bands Lys and Spiral 69. Serving as an executive producer, Hewitt and Corkett oversaw the production of six songs on Lys' debut album Go Your Own Way (2013) and the entirety of Spiral 69's third album Ghosts in My Eyes (2013). Hewitt worked on Lys' second album Rebud at his home studio in early 2014, along with Paul Corkett and Love Amongst Ruin member Donald Ross Skinner. A second session took place in April 2014. The album is expected to see release in late 2015.with Boo Radleys
Ichabod and I (1989)
Violent Sentimental (1993)
with Baby June
Need to Need You (1993)
Without You I'm Nothing (1998)
Black Market Music (2000)
Sleeping with Ghosts (2003)
with Love Amongst Ruin
Love Amongst Ruin (2010)
Lose Your Way (2015)
with Polaroid Kiss
The New Coliseum (Expanded Compilation) (2013)
with Six By Seven
Love and Peace and Sympathy (2013)
Breed – Clawfist – The Peel Sessions (split with Gallon Drunk) (1992)
Love Amongst Ruin – Home (2010)
Polaroid Kiss – The New Coliseum (2011)
Sharkboy – The Valentine Tapes (LP, 1995); drums on "Same Mother of Pearl"
Sharkboy – The Valentine Singles (4-part single set, 1995); 8 tracks
LYS – Go Your Own Way (2013, album, with Paul Corkett); 7 tracks
Spiral 69 – Ghosts in My Eyes (2013, album, with Paul Corkett)
LYS – Redbud (2015, album, with Paul Corkett)