Child sex offenders should be assessed for voluntary chemical castration before being released into the community, a NSW parliamentary inquiry has found.

After a year-long inquiry into the state's sentencing options for child sex offenders, a joint select committee recommended a standard policy for assessing offenders for the anti-libidinal treatment.

Community expectations: Troy Grant, the chairman of the inquiry into the sentencing options for child sex offenders. Credit:Brendan Esposito

The committee handed down 29 recommendations on Tuesday, including that an extra 10 offences be added to the list of child sex offences to attract non-parole periods.

Only four child sex offences are subject to standard periods of non-parole, ranging from eight to 15 years.