The relatively small dwellings that were built twenty to thirty years ago are no longer regarded as acceptable. New regulations concerning noise and heat insulation as well as government aid available to finance such projects have, in addition, stimulated the rebuilding and thus the design of more generously proportioned dwellings, including, of course, staircases.
The style of living has changed. The time when sober interiors were the order of the day has gone. Excessive nostalgic reversal to previous styles has also passed.