Here is a report into low-cost-low-impact housing. Unfortunately, here in Manchester, the council has demolished council housing, instead of retro-fitting the houses to improve their energy efficiency. And then handed the land over to property developers, with the stipulation that the new homes should meet code 5 of the national standards. Code 6, is the new minimum standard they should be building to, though I believe they should be built to the superior Passivhaus standards.
low-cost-low-impact-housing-2012-high-res.pdf (application/pdf Object).