There is another fun point to this I have just remembered.
Imagine if the last Labour government had chosen passive house standards as minimum for the UK. Very roughly 1,000,000 houses have been built by then. They could all have zero heating costs.
They could have had solar panels and electric charging points as standard so they would.be pumping energy into the grid and we would have much higher EV uptake.
All for no extra cost because all the construction consortium's would have altered their spreadsheets to take the extra cost from the offer for the land. Land banking companies would have lost 20-30k from each house.