Maidstone prison is situated on the northern edge of the County Town of Kent. It was completed in 1819 and was constructed from local Kentish ragstone quarried from the site, to a design by architect Daniel Asher Alexander, and was the most advanced model of its time.

HMP Maidstone is a Category ‘C' Training Prison that works in partnership through a multi agency approach to provide a safe, decent and constructive regime that challenges offending behaviour, reduces re-offending and prevents further victims. Regime activities including workshops, gymnasium, and education are integrated. HMP Maidstone is the Sex Offender Delivery Centre for Kent & Sussex. We aim to Create a therapeutic environment that supports, embraces and empowers change with a primary focus on risk reduction and public protection. This Treatment Centre has been developed as part of an integrated approach to regime delivery. Maidstone is also a centre for Category C Foreign National Prisoners (FNP) with more than 18 months left to serve, and provides liaison & forums with the UK Border Agency.

Main line rail links and motorways to London ensure that Maidstone today is a much sought after location for prisoners, giving ease of access to friends and families for visits.