The prison is located in a largely rural area close to the village of Ranby in Nottinghamshire, about one mile from Ranby village which lies 3 miles from Retford and 6 miles from Worksop on the A620.
The prison opened in 1971 on the site of a former army camp. It has seen a steady expansion from 2004 with the development of modern house blocks. The most recent expansion was C wing, which opened in 2008. Workshops, a new kitchen, a library and education facilities have been added as part of previous expansions. The recent expansion of the prison has enabled a larger number and variety of work places, including the conversion of the former clothing exchange store and original C wing into the health care building and performance suite.
The accommodation at the prison is as follows:
- A wing is a two-storey building, built in 1983, with spurred single-cell accommodation. It has places for 192 prisoners, including a spur for prisoners with disabilities and the over-40s.
- C wing is a quick build wing, offering 60 places in double occupancy with integral showers and sanitation.
- D (118), E (124), F(126) and G (124) wings have a mixture of single and double cells with integral sanitation on each wing.
- H and I wings have accommodation for 60 prisoners in single cells with integral sanitation; H wing is the drug-free wing.
- J and K wings opened in September 2004 and accommodate 226 prisoners in a mixture of single and double cells, some of which are constructed to safer cells standard.
The #1 governor is Susan Howard, and the prison can accommodate up to 1098 prisoners. HMP Granby is managed by HMPS and is part of the East Midlands group of prisons.