A Crown appeal of teen rapist Jayden Meyer's nine-month home detention sentence has been dismissed.

The now 18-year-old was convicted of raping four 15-year-old girls and sexually violating a fifth.

But although the appeal's been denied -- High Court Justice Sally Fitzgerald says the sentencing process lacked transparency.

But, criminal lawyer Steve Cullen says the appeal against the sentence came six weeks outside the statutory window.

LISTEN ABOVE

• Jayden Meyer's home detention sentence is appealed by Crown
• Teen sentenced to nine months' home detention after raping four girls
• Advocate for crime victims discusses controversial Jayden Meyer sentencing