What Time of Year Do Prices Increase? by Norris Minick When people hear that house prices are going up 12% a year, most assume that they are going up about 1% a month over the entire year. As we’ve told our clients for years, however, that’s not how it works. In market where prices are surging, nearly all the price increase for a given year occurs between the months of January and June. So, when we have a 10% price increase, a house that sold for $500,000 house in January will tend to sell for $550,000 by the end of June.