A little window dressing not going to work
The few changes in housing policy are not going to make any difference. The target of 30% of the buyers household income is fixed and viewed as affordable and reasonable to take. No need to bother about cost of construction, no need to bother about the risk that the buyers will be exposed to. In such cases, the bigger the income the bigger the stone mill hanging on the neck. And when a crisis comes, the bigger the income/stone mill, the bigger the losses and pain. We have got through that many times. Preventing people from buying what the people think is affordable to them, and dictating what is affordable to the people is another mean policy like the mean testing in hospital admissions. The govt decides on what the people should spend as reasonable and affordable. The people cannot decide what is prudent for themselves. And like the deaf frog, no need to listen, just move on, bring it higher for the good of the people.