He said: "That the stigma, that the branding together of the residents, all 10,000 needs to be removed and should have been removed long before this and I'm really sorry that that never happened, and I regret that never happened.
"I'm sorry that this release of pressure and understanding of so many of those women was not done before this, because they were branded as being the fallen women, as they were referred to in this state."
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The PM promises to double to 200,000 the number of homes built under an existing scheme aimed at easing Britain's housing shortage.
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The plan, which would effectively strip banks of the benefit of recent corporation tax cuts, forms part of the party's election manifesto.