by Calculated Risk on 3/18/2013 02:46:00 PM

Weekly Update: One of key questions for 2013 is Will Housing inventory bottom this year?. Since this is a very important question, I'm tracking inventory weekly this year.

In normal times, there is a clear seasonal pattern for inventory, with the low point for inventory in late December or early January, and then peaking in mid-to-late summer.

The NAR data is monthly and released with a lag.  However Ben at Housing Tracker (Department of Numbers) kindly provided me some weekly inventory data for the last several years. This is displayed on the graph below as a percentage change from the first week of the year (to normalize the data).

In 2010 (blue), inventory followed the normal seasonal pattern, however in 2011 and 2012, there was only a small increase in inventory early in the year, followed by a sharp decline for the rest of the year.

So far - through March 18th - it appears inventory is increasing at a sluggish rate, but faster than in 2011 and 2012. Housing Tracker reports inventory is down -22.2% compared to the same week in 2012 - still a rapid year-over-year decline.

Click on graph for larger image.

Note: the data is a little weird for early 2011 (spikes down briefly).

The key will be to see how much inventory increases over the next few months. In 2010, inventory was up 15% by the end of March, and close to 20% by the end of April.

For 2011 and 2012, inventory only increased about 5% at the peak and then declined for the remainder of the year.

So far in 2013, inventory is up 6.0% (above the peak percentage increase for 2011 and 2012) Right now I think inventory will not bottom until 2014, but it is still possible that inventory will bottom this year.