Originally from Inverell in north-west NSW, Hewat is a product of Brisbane's renowned Rugby nursery, Nudgee College.
In 2003, Hewat represented the Potoroo's 7 A Side Rugby Team where he won player of the tournament at the prestigious Darwin Hottest Sevens.
[3] The leading Super 12 point scorer in his debut year, his 10 tries broke Scott Staniforth's Waratah record for tries in a season.
He missed just one match for the season, when he was rested from the Waratahs clash with the Romanian Barbarians on the Gulf Air development tour of Eastern Europe.
[citation needed] On top of this, Hewat played two games for Australia A and captained Manly to within one win of the Tooheys New Cup Grand Final.
[citation needed] After the end of the 2007 S14 season it was leaked to the press, and Hewat himself during a speakerphone incident with Lote Tuqiri, that he was not in the reckoning for a Wallaby position and will not be included in the squad.
On 27 July 2007, it was confirmed by NSWRU and Hewat that they had worked out a release so he could continue playing rugby over in Europe for London Irish.