The work is part of a wider £4bn investment programme to create an additional 20,000 prison places across the UK by the mid-2020s.

Procured through the Crown Commercial Services framework, the prison places will be in new houseblocks with a standard design and construction approach.

Each houseblock will include 60 single-occupancy rooms and be supported by other relevant ancillaries. This is subject to approval processes following completion of the preconstruction period that has been awarded for £6.5m.

The projects will be built under an alliance contract.

Alistair McNeil, sector director at ISG, said: “The significant expansion and investment in the UK’s prison estate is a major undertaking.

“Incentivising behaviours that foster collaboration, knowledge sharing, transparency and operational performance creates a culture of innovation leading to consistently better-built outcomes, benefiting the prison population and wider society.”

ISG was recently appointed to the MoJ’s five-year, £2.5bn Constructor Services Framework and is currently delivering its single largest refurbishment project to date – a £61m upgrade scheme at HMP Birmingham.