Grendon Prison: visits, calls and family info

Buckinghamshire England and Wales HP18 0TL Last inspected August 2023
Grendon Prison
Grendon Prison. Photo: Andy Gryce , CC BY-SA 2.0

Someone you care about is in Grendon Prison. Here is how to book visits, get the phone calls going, and send money in, with links to the official pages for the details that change.

The official page for Grendon Prison Visiting times, booking contacts and property rules change, so always check the official Grendon Prison page before you travel or send anything.

Where it is

Grendon Prison is in Buckinghamshire. Postcode for sat navs: HP18 0TL. Get directions from where you are.

Plan for longer than the sat nav says. You usually need to arrive 45 minutes before the visit starts for checks.

Getting there by public transport

Walking times are rough estimates from straight-line distance. Check timetables before you travel, especially for weekend visits.

Booking a visit

Visiting times

  • Wednesday, Saturday and Sunday: 1:45pm to 3:45pm

These change. Always confirm on the official Grendon Prison page before you travel. We checked them in July 2026.

How to book

If they are on remand you can usually book straight away. If they are convicted, they must send you a visiting order first. Children can visit, and many prisons run relaxed family days: see children and prison.

What to expect at the gate

Phone calls

They ring you, from approved numbers only, and they pay for the call. Your number has to be submitted and checked first, which takes days: see why numbers take time to approve. Once calls are flowing, most families can cut the cost sharply: check the call cost calculator and the cheaper calls guide.

Not heard from them? Our contact tool works through the common reasons.

Sending money and things in

Money goes through the free official service, Send money to someone in prison. You need their prisoner number and date of birth. There is a weekly cap on what they can spend: see how much is worth sending. For letters, photos, clothes and books, read what you can send in, then check Grendon Prison's own rules on the official page before posting anything.

What inspectors found at Grendon Prison

Independent inspectors visit every prison, test it against four standards, and publish what they find. This is from the most recent full inspection of Grendon Prison, in August 2023:

Safety How safe people are from violence and self-harm
Good
Respect Decent living conditions and being treated fairly
Good
Things to do Work, education and time out of the cell
Not good enough
Preparing for release Family contact, planning and support for getting out
Good

From the full HM Inspectorate of Prisons report, where each standard is scored from poor up to good. Contains public sector information licensed under the Open Government Licence v3.0. Things can change quickly after an inspection, for better and worse.

Every prison also has an Independent Monitoring Board: ordinary people who go in regularly and publish a yearly report on daily life inside. Worth a read if you want more detail.

If money is tight

On a low income, the Assisted Prison Visits Scheme can pay your travel to Grendon Prison, and hardly anyone claims it: check if you qualify.

Contacts and complaints

Contact Grendon Prison

Who runs it
HM Prison and Probation Service (a public prison)
Governor
Olivia Phelps (as listed by the prison, July 2026; leaders change)
Main phone (24 hours)
01296 445 000
Book a visit
01296 445 243
Address
HMP Grendon, Grendon Underwood, Buckinghamshire, HP18 0TL
Video call bookings
socialvisits.grendon@justice.gov.uk

Worried about someone right now

If you fear for a prisoner's safety, ring the prison on 01296 445 000 and ask for the Safer Custody team or the orderly officer, and say it is an emergency. For urgent family news like a death or serious illness, ask for the chaplaincy. The free Prisoners' Families Helpline (0808 808 2003) can help you reach the right person.

Making a complaint about the prison

As a family member you cannot use the prisoner's internal complaints system, but you can raise concerns. Contact the prison first (01296 445 000) and keep a note of who you spoke to. If it is not sorted out, these are independent of the prison:

The official steps are set out on GOV.UK: making a complaint about a prison.

How the prisoner makes a complaint

The person inside asks a member of staff for a complaint form (often called a "COMP 1") and can put in a complaint about almost anything. If they are unhappy with the answer, they can escalate it, and then write confidentially to the Prisons and Probation Ombudsman. They also have confidential access to the Independent Monitoring Board and to their own MP, which staff cannot read or block. Serious safety issues can go straight to Safer Custody.

The bigger questions

When will they get out? Can they get a tag? What happens to the benefits? Start with the release date tool, the tag checker and the benefits checklist. And if it all just happened, read the first 48 hours.

Checked: 15 July 2026 We update this page when the rules change.