Returning to post war building (the FIRST world war, that is) this really should be the model.
Millions of houses thrown up in a few years. To the extent that it's possible to pretty much interchange developments from Harrow (where I grew up) through Watford, Oxford, Bristol, Birmingham, Manchester, Leeds, Liverpool, Newcastle, Exeter, and all the towns in between. The street I grew up in took just over a year to build - 400+ houses. When we moved in, our neighbours had lived there since day one in 1933. The builders were about 10 houses ahead, and the local primary/middle school was bang in the middle of the road and finished a couple of months later.
That's how you solve a housing crisis. Not piss about with the fonts on mortgage offers.