Glen Parva Young Offenders Institute in Leicestershire is inviting residents to come and find out more about plans to extend the prison.
Glen Parva currently houses about 800 young offenders between the ages of 18 and 21.
Leaflets have been delivered to nearby residents, outlining plans to extend the site to accommodate a further 360 young offenders.
Exhibitions are being held this week at the Memorial Hall in Glen Parva.
The Ministry of Justice said it intended to submit a planning application to Blaby District Council some time in September and welcomed opinions and questions from the public.
If plans are approved, work could start in June 2009, with the first inmates able to take up residence from November 2011.