A House Price Index (HPI) measures the price changes of residential housing.An index that measures the price of residential housing (specifically single-family properties) which is published by National Bank of Canada.The Teranet – National Bank House Price Index™ is an independent representation of the rate of change of Canadian single-family home prices. The measurements are based on the property records of public land registries, where sale price is available.
Source: http://www.housepriceindex.ca/