HMP Cardiff is a Category B local prison in the capital of Wales, serving courts across South Wales.
About HMP Cardiff
HMP Cardiff is a Category B male establishment situated in Cardiff, Cardiff, within the Wales region. Operated by HM Prison and Probation Service (HMPPS), the prison has an operational capacity of approximately 819 and has been in operation since 1832.
Category B prisons hold those who don't require maximum security, but for whom escape still needs to be made very difficult. Many local prisons that serve courts fall into this category, holding both remand and sentenced prisoners.
How to Visit HMP Cardiff
If you want to visit someone at HMP Cardiff, you'll first need to be placed on the prisoner's approved visitor list. The prisoner themselves will need to submit your details — including your full name, date of birth, and address — for a basic security check. This process can take a few days to a couple of weeks, depending on the prison.
Once you've been approved, you can book visits in one of two ways:
- Online: Use the GOV.UK prison visit booking service — it's free and available 24/7
- By phone: Call HMP Cardiff directly on 029 2092 3100 during working hours
On the day of your visit, make sure you arrive at least 30 minutes before your allocated time. You'll need to bring valid photo ID (passport, driving licence, or national identity card). There are restrictions on what you can bring into the prison — generally no phones, cameras, or electronic devices are allowed. Most prisons allow a small amount of cash for the vending machines in the visits hall.
Contacting HMP Cardiff
You can reach HMP Cardiff by phone on 029 2092 3100. Phone lines are typically open Monday to Friday during standard office hours. For written correspondence, the postal address is:
If you need to send money to someone at HMP Cardiff, the easiest method is through the GOV.UK Send Money to a Prisoner service. It's free and takes just a few minutes online.
Sending Items to Prisoners at Cardiff
Rules on sending items vary by prison, but generally you cannot send parcels directly to prisoners. Most prisons use an approved catalogue system where prisoners can order items using money in their prison account. Some establishments allow books to be sent via approved retailers such as Amazon or Blackwell's — but always check with the prison first by calling 029 2092 3100.
Phone Calls at HMP Cardiff
Prisoners at HMP Cardiff can make outgoing calls using the prison phone system (typically BT or a dedicated provider). They'll need credit on their phone account, which can be topped up by family and friends. Calls to UK landlines generally cost around 1p per minute, while mobile calls are more expensive. For more detail on costs, see our guide on how much prison phone calls cost.
Prisoners cannot receive incoming calls. All outgoing calls (except those to legal representatives) are recorded and may be monitored.
Frequently Asked Questions About HMP Cardiff
What category is HMP Cardiff?
HMP Cardiff is classified as a Category B prison. Category B prisons hold those who don't require maximum security, but for whom escape still needs to be made very difficult. Many local prisons that serve courts fall into this category, holding both remand and sentenced prisoners.
What is the capacity of HMP Cardiff?
The prison has an operational capacity of approximately 819 prisoners. This number represents the certified normal accommodation plus any additional temporary beds. Actual population levels can fluctuate and sometimes exceed capacity.
How do I contact HMP Cardiff?
You can call HMP Cardiff on 029 2092 3100 during weekday working hours. For written correspondence, address letters to the prisoner's full name and prison number at Knox Road, Cardiff, Cardiff, CF24 0UG.
How do I book a visit to HMP Cardiff?
First, you need to be on the prisoner's approved visitor list. Once approved, book online at gov.uk/prison-visits or call 029 2092 3100. For more detailed information, see our guide on how to book a prison visit.
Who runs HMP Cardiff?
HMP Cardiff is operated by HMPPS. HM Prison and Probation Service is an executive agency of the Ministry of Justice, responsible for running most prisons in England and Wales.