Between 2010 and 2024, Conservative governments repeatedly claimed they were expanding prison capacity to cope with rising demand. Ministers pointed to thousands of new prison places being built as evidence they were investing in the criminal justice system. However, the overall picture tells a very different story.
Official Ministry of Justice figures show that between May 2010, when the Conservatives entered government, and April 2024, the prison estate in England and Wales experienced a net increase of just 482 prison places—effectively around 500 additional places over 14 years. That statistic has become central to the debate over Britain’s overcrowded prisons and the emergency measures now being taken to reduce inmate numbers.
The figures help explain why Prime Minister Andy Burnham recently argued that today’s prison crisis is rooted in years of underinvestment. Speaking in August 2026, he said that “just 500 places were added and 23 prisons were closed” between 2010 and 2024, pointing to what he described as a failure to expand capacity in line with demand.
Conservative leader Kemi Badenoch has countered by saying the previous government created 14,000 new prison places during its time in office. On the face of it, this appears to contradict Burnham’s claim. In reality, both statements are based on the same Ministry of Justice data; they simply measure different things.
The Conservatives did indeed create approximately 14,142 new prison places over the period. However, those gains were almost entirely cancelled out by losses elsewhere across the prison estate.
More than 11,650 prison places disappeared because prisons were closed or accommodation became unusable through deterioration and dilapidation. A further reduction of just over 2,000 places resulted from other changes in operational capacity. Once these losses are taken into account, the overall increase amounted to only 482 places.
That distinction between gross additions and net capacity is crucial.
Building new prison blocks undoubtedly increased capacity in some locations, but simultaneously allowing older facilities to close without sufficient replacement meant that the prison system as a whole barely grew. Meanwhile, the prison population continued to rise, fuelled by longer sentences, tougher sentencing policies and growing court backlogs.
The result was an increasingly overcrowded prison estate operating close to maximum capacity for years. Governors repeatedly warned about the strain on staff, rehabilitation programmes and prisoner safety. Overcrowding also limited the ability to separate dangerous offenders, provide education and training, and reduce reoffending.
By the time the Conservatives left office following the 2024 general election, the prison system was facing one of its most severe capacity crises in decades. Successive governments have since been forced to consider controversial measures, including expanding early-release schemes, to prevent prisons from running out of space altogether.
The Ministry of Justice figures therefore demonstrate that while thousands of prison places were constructed between 2010 and 2024, the overall size of the prison estate barely changed. The net increase of roughly 500 places over fourteen years illustrates why many experts argue that prison construction failed to keep pace with both population growth and tougher sentencing policies.
As political parties continue to debate responsibility for today’s prison crisis, the official figures suggest that headline claims about thousands of new prison places tell only part of the story. The more significant measure is the overall capacity available to house prisoners and on that measure, England and Wales ended fourteen years of Conservative government with virtually no meaningful expansion at all.
