In 2014 there were 2,822 private households in St. Moritz with an average household size of 1.84 persons. Of the 884 inhabited buildings in the municipality, in 2000, about 29.1% were single family homes and 40.8% were multiple family buildings. Additionally, about 19.9% of the buildings were built before 1919, while 8.6% were built between 1991 and 2000. In 2013 the rate of construction of new housing units per 1000 residents was 9.32. The vacancy rate for the municipality, , was 3.18%.