Bring back the pre-fab.
It will speed up provision, cost a damn sight less, require less subsidy of rents, and incentivise people to use them as a stepping stone.
Former council houses such as the one I lived in, built to the late 60's Parker-Morris standards, are now among the more desirable houses of their type in many areas. Private housing of the same era did not always meet these standards, and the council houses frequently had bigger gardens. Perhaps this explains why so many people wanted to hang on to them.
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