A conviction against a Sydney youth charged with raping an 18-year old girl outside his father's nightclub will be overturned and a retrial ordered after claims a judge misdirected a jury.

Luke Lazarus was convicted in 2013 over the sexual assault of a woman at his father Andrew's King Cross club Soho.

Police alleged the 23-year old man invited his victim to meet the DJ before instead offering to take her to the VIP area.

Lazarus allegedly led the woman into laneway and raped her before demanding she put her number in his phone.

Today the NSW Court of Criminal Appeal ruled trial judge Sarah Huggett had misdirected the jury on the issue of consent.

The court granted Lazarus bail with a $50,000 bond ahead of a final judgment in the coming weeks, Fairfax media reports.

"The court is in a position to say that it's satisfied at this stage that ground two (of the appeal) has been made out," Justice Hoeben said.

"That would entitle the applicant to a new trial."