HMP Grendon

Grendon Prison

Tel: 01296 445000 – Grendon Underwood, Aylesbury, Buckinghamshire HP18 0TL

Save Any Inmate At HMP Grendon

75% On Their Calls

Prison Phone offers phone tariffs that reduce the costs of calls from Grendon prison by up to 75%! This enables prisoners to get the support and love that they are missing from home, while reducing costs for the inmate. Find out more below.

HMP Grendon originally opened in 1962 as a psychiatric prison. Its purpose was to provide inmates with treatment for antisocial personality disorders. Since then, the prison has changed and now runs more in line with standard UK prison practice. However, it does still continue to offer therapeutic care for offenders. HMP Grendon accepts both category B and category C adult male prisoners and inmates must choose to come there, and indicate a genuine desire to change. It has a capacity of 238. If you’d like directions to the prison, please view the map on this page.

Tel: 01296 445000

Operational capacity: 238

Grendon Underwood, Aylesbury, Buckinghamshire HP18 0TL

Prison Phone have been saving inmates at HMP Grendon money on their calls from the prison to any UK mobile phone since 2013.

We do this by allocating a dedicated and secure local number to your mobile phone, this means when the inmate at Grendon prison calls the new local number we have provided they will be charged at just the local landline rate (around 10p per minute) rather than the standard mobile rate (which is around 40p per minute).

This in turn helps to stretch the inmates PINS phone credit further and reduces the amount you need to send in for them to top up!

To open an account in less than 3 minutes please use the button below!

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Here's some facts about Grendon prison.

Did you know?

HMP Grendon is a category B prison in Grendon Underwood, Buckinghamshire. Opened in 1963, the prison can hold up to 238 men at a time. The prison is jointly managed with HMP Springhill, located next-door to Grendon.

Keith Downie escaped from a police vehicle on the M60 near Manchester at the end of a day release. He claimed he was feeling I’ll, so the driver slowed the car to pull into a layby, and Downie jumped out of the car while it was moving. He was seen running towards the Oldham district of Manchester.

There are five separate wings – A, B,C,D, and G wings – housing approximately 40 men each and an induction and assessment unit – F Wing – holding up to 25 prisoners. A Wing was predominantly for sex offenders, and F wing was identified as a therapeutic community for men with learning difficulties.

To view the latest HMIP inspection report, click here.

Visiting hours are between 14:00 – 16:00 in Wednesdays, and 13:45 – 15:45 Saturdays and Sundays.

  • HMP Grendon treats inmates who have committed serious sex offences and violent crimes.


    Grendon prison fact 3
  • The prison enjoys a good reputation for good staff / inmate relations, few incidences of violence and only isolated cases of self-harm.


    Grendon prison fact 2
  • Research has revealed that those who remain at HMP Grendon for longer than 18 months are less likely to reoffend.


    Grendon prison fact 1


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