Prison Categories Explained
Thematic illustration — not a photograph of a named prison.
Prisons are categorised by security level to match the risk posed by different prisoners. Understanding these categories helps explain why prisoners are held where they are.
UK Prison Categories
In England and Wales, male prisons are classified into four categories:
- Category A: Maximum security for prisoners whose escape would pose the highest risk to the public, the police, or national security. Category A prisons include HMP Belmarsh, HMP Wakefield, and HMP Manchester (Strangeways). Within Category A, prisoners may be further classified as Standard, High, or Exceptional risk.
- Category B: High security for prisoners who don't need maximum security but for whom escape must be made very difficult. Category B prisons serve as local prisons (receiving prisoners from courts) and training prisons. Examples include HMP Pentonville and HMP Wandsworth.
- Category C: Training prisons for prisoners who can be trusted in semi-open conditions but who lack the reliability to be placed in open conditions. Category C prisons focus on education, work, and rehabilitation programmes. HMP Bullingdon operates partly at this level.
- Category D: Open prisons for prisoners who can be trusted not to escape and who present a low risk to the public. Open prisons have minimal physical security and prisoners may be permitted to leave the facility for work, education, or home visits. Examples include HMP North Sea Camp and HMP Sudbury.
How Categorisation Works
New prisoners are assessed and categorised during the reception process. The categorisation considers the nature of the offence, sentence length, escape risk, and any intelligence about the prisoner's behaviour or associations.
Prisoners typically progress through the categories during their sentence, moving from higher to lower security as they demonstrate good behaviour and reduced risk. This progression is reviewed regularly and forms part of the sentence planning process.
Women's Prisons
Women's prisons in England and Wales are not formally categorised using the same system. Instead, they are classified as either closed or open. Most women's prisons operate at a level roughly equivalent to Category B or C.
US Federal Security Levels
- Minimum: Camp-style facilities with limited or no fencing. Inmates are typically non-violent offenders serving short sentences. Work assignments often involve community service.
- Low: Double-fenced perimeters with dormitory housing. Greater staff supervision than minimum facilities.
- Medium: Strengthened perimeters with cell-type housing. Internal security measures are more rigorous.
- High: Highly secure with reinforced fencing and close staff supervision. Movement is highly controlled. USP Leavenworth is an example.
- Administrative/Supermax: The most restrictive, including ADX Florence. These facilities house inmates who pose the greatest threat to safety and security.
State Prison Systems
Each US state operates its own classification system, which may use different terminology. Most states use some variation of Minimum, Medium, Maximum, and Supermax designations, but the specific criteria for each level vary.