A serial child sex offender remains at large, after police raided two Christchurch homes but came up empty.

Christopher Roche, also known as Kristian Glanville, has active warrants out for his arrest.

A police spokesperson says he's wanted on multiple charges, including two breaches of extended supervision, and failing to comply with his bail conditions.

Police also believe he may have access to a firearm.

Sensible Sentencing Trust records show he's been previously convicted for child sex offences, dating back to when he was 17-years-old.