In Ireland banks may not lend more than 3.5 times the borrower’s income. Across Ireland in Marchaverage house prices were 7.4% ahead of a year earlier. In Dublin they were up 10.5%.http://www.cso.ie/en/statistics/ ... releasearchive2016/
Note however that Irish house prices are still about 34% below levels at the silly peak in 2007 before thereality of massive excess building was realised.
In the UK banks can do very little lending where debt exceeds 4.5 times the borrower’s income. One of thehouse price gauges, from Halifax, rose 10.1% in the year ending March. Another, Nationwide, estimated arise of 5.7%.
It is not certain that introducing debt to income restrictions in New Zealand will radically affect house pricesbut we would expect sales to decline and the pace of price rises to slow.