The four 'mini-prisons' announced by the Ministry of Justice will hold a total of 1,260 prisoners.
Under the plans, the 'houseblocks' will be built at HMPs Parc in Bridgend, Peterborough in Cambridgeshire, The Mount in Hertfordshire and Thameside in London.
Six prisons in England will close, along with sections of three others.
Justice Secretary Chris Grayling says the plans will "bring down the cost" of operating the prison system, with the target of saving £63m annually.
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A largely dry day with just a risk of isolated showers especially in the north and west. Heavy and persistent rain overnight.
On a visit to Wales Labour leader Ed Miliband sets out a ten-point promise on how his party will deal with immigration.
One of the men was described as carrying an object similar to a handgun in the bakery delivery van hold-up