In 1851, an ad-hoc group of structures built by prison labour using local materials existed.
None of these structures survived, other than the boundaries of the prison that were established.
The second phase of construction, undertaken in the late 1850s and early 1860s, was the construction of Inspector General William Champ's model prison complex, based on British and American precedents.

In 1924, Pentridge replaced the Melbourne Gaol as the main remand and reception prison for the metropolitan area.
In 1929, Melbourne Gaol was closed and its prisoners relocated to Pentridge.
The Victorian Government confirmed its intention to close Pentridge and replace it with two new male prisons, each accommodating around 600 prisoners, in December 1993.
In April 1995, the Office of Corrections ordered that the six main towers at Pentridge be closed, since most of the high security prisoners from the gaol had been relocated to Barwon as part of the downgrading of Pentridge to a medium security prison.
The prison was finally closed in 1997 and sold by the State Government of Victoria.

Since the site was closed, almost all of the buildings identified as being of no significance in the 1996 Pentridge Conservation Management Plan (1996 CMP) prepared by Allom Lovell & Associates have been demolished with the approval of Heritage Victoria.
The remaining heritage buildings and landmarks of significance, including A, B, D, E and H Divisions, B Annexe, Pentridge's iconic entrance, the Administration Building, the Warden's Quarters, the Rock-Breaking Yards, the Guard Towers/Posts (or Observation Posts) and the wall surrounding the site have been retained and will undergo restoration works to ensure their stability and preservation into the future.
The site as a whole is also classified as a place of state significance by the National Trust of Australia (Victoria) (National Trust).
The National Trust has adopted the levels of significance identified in the 1996 CMP.
In 1851, an ad-hoc group of structures built by prison labour using local materials existed. None of these structures survived, other than the boundaries of the prison that were established. The second phase of construction, undertaken in the late 1850s and early 1860s, was the construction of Inspector General William Champ's model prison complex, based on British and American precedents.
In 1924, Pentridge replaced the Melbourne Gaol as the main remand and reception prison for the metropolitan area. In 1929, Melbourne Gaol was closed and its prisoners relocated to Pentridge. The Victorian Government confirmed its intention to close Pentridge and replace it with two new male prisons, each accommodating around 600 prisoners, in December 1993. In April 1995, the Office of Corrections ordered that the six main towers at Pentridge be closed, since most of the high security prisoners from the gaol had been relocated to Barwon as part of the downgrading of Pentridge to a medium security prison. The prison was finally closed in 1997 and sold by the State Government of Victoria.
Since the site was closed, almost all of the buildings identified as being of no significance in the 1996 Pentridge Conservation Management Plan (1996 CMP) prepared by Allom Lovell & Associates have been demolished with the approval of Heritage Victoria. The remaining heritage buildings and landmarks of significance, including A, B, D, E and H Divisions, B Annexe, Pentridge's iconic entrance, the Administration Building, the Warden's Quarters, the Rock-Breaking Yards, the Guard Towers/Posts (or Observation Posts) and the wall surrounding the site have been retained and will undergo restoration works to ensure their stability and preservation into the future. The site as a whole is also classified as a place of state significance by the National Trust of Australia (Victoria) (National Trust). The National Trust has adopted the levels of significance identified in the 1996 CMP.
HM Prison Pentridge