The S&P CoreLogic Case-Shiller U.S. National Home Price NSA Index, covering all nine U.S. census divisions, reported a 5.8% annual gain in December, up from 5.6% last month and setting a 30-month high. The 10-City Composite posted a 4.9% annual increase, up from 4.4% the previous month. The 20-City Composite reported a year-over-year gain of 5.6%, up from 5.2% in November.

Seattle, Portland, and Denver reported the highest year-over-year gains among the 20 cities over the 11 months leading up to December. Seattle led the way with a 10.8% year-over-year price increase in December, followed by Portland with 10.0%, and Denver with an 8.9% increase. Twelve cities reported greater price increases in the year ending December 2016 versus the year ending November 2016.

MONTH-OVER-MONTH

Before seasonal adjustment, the National Index posted a month-over-month gain of 0.2% in December. Both the 10-City Composite and the 20-City Composite indices posted 0.3% increases. After seasonal adjustment, the National Index recorded a 0.7% month-over-month increase, while the 10-City and 20-City Composites each reported 0.9% month-over-month increases. Eighteen of 20 cities reported increases in December before seasonal adjustment; after seasonal adjustment, all 20 cities saw prices rise.

ANALYSIS

"Home prices continue to advance, with the national average rising faster than at any time in the last two-and-a-half years," says David M. Blitzer, Managing Director and Chairman of the Index Committee at S&P Dow Jones Indices. "With all 20 cities seeing prices rise over the last year, questions about whether this is a normal housing market or if prices could be heading for a fall are natural. In comparing current home price movements to history, it is necessary to adjust for inflation. Consumer prices are higher today than 20 or 30 years ago, while the inflation rate is lower. Looking at real or inflation-adjusted home prices based on the S&P CoreLogic Case-Shiller National Index and the Consumer Price Index, the annual increase in home prices is currently 3.8%. Since 1975, the average pace is 1.3%; about two-thirds of the time, the rate is between -4% and +7%. Home prices are rising, but the speed is not alarming.

"One factor behind rising home prices is low inventory. While sales of existing single family homes passed five million units at annual rates in January, the highest since 2007, the inventory of homes for sales remains quite low with a 3.6 month supply. New home sales at 555,000 in 2016 are up from recent years but remain below the average pace of 700,000 per year since 1990. Another factor supporting rising home prices is mortgage rates. A 30-year fixed rate mortgage today is 4.2% compared to the 6.4% average since 1990. Another indicator that home price levels are normal can be seen in the charts of Seattle and Portland OR. In the boom-bust of 2005-2009, prices of low, medium, and high-tier homes moved together, while in other periods, including now, the tiers experienced different patterns."

SUPPORTING DATA

Table 1 below shows the housing boom/bust peaks and troughs for the three composites along with the current levels and percentage changes from the peaks and troughs.

Table 2 below summarizes the results for December 2016. The S&P CoreLogic Case-Shiller Indices are revised for the prior 24 months, based on the receipt of additional source data.

Table 3 below shows a summary of the monthly changes using the seasonally adjusted and non-seasonally adjusted data. Since its launch in early 2006, the S&P CoreLogic Case-Shiller Indices have published, and the markets have followed and reported on, the non-seasonally adjusted data set used in the headline indices. For analytical purposes, S&P Dow Jones Indices publishes a seasonally adjusted data set covered in the headline indices, as well as for the 17 of 20 markets with tiered price indices and the five condo markets that are tracked.