I do not know the percentage of the housing stock either, but housing stock here is very conservative. Many people still live in 100+ year old houses. New houses are being built, but the turnover rate is probably less than 1 per cent of all units a year right now, due to the vast bureaucracy.
But among the newly built houses, I see quite a lot of prefabricated houses out of wood. And the process of building them is rather quick. Once the lot is ready, a semi and a crane arrive and the house just grows in front of your eyes. Brick houses take a lot longer to build.
