In a 2008 paper, Paul Cheshire and Christian Hilber estimated the “shadow tax" imposed by such regulations on office prices in London and other major cities. They found a shadow tax rate of planning restrictions (above construction costs) of about 800% in London’s West End, and of nearly 500% in the City of London. The comparable rate is about 300% in Paris, 68% in Brussels, and 50% in Manhattan. (The Manhattan estimate is for the year 2000; other city estimates are for the early 2000s.)
Motsvarande siffra för Stockholm: 330 procent.