by Calculated Risk on 4/08/2013 06:25:00 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) has 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 mostly 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 April 8th - inventory is increasing faster than in 2011 and 2012.

Click on graph for larger image.

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

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 8.5% (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.

This graph shows the NAR estimate of existing home inventory through February (left axis) and the HousingTracker data for the 54 metro areas through early April.  

Since the NAR released their revisions for sales and inventory in 2011, the NAR and HousingTracker inventory numbers have tracked pretty well.

The third graph shows the year-over-year change in inventory for both the NAR and HousingTracker.

HousingTracker reported that the early April listings, for the 54 metro areas, declined 20.0% from the same period last year.

The year-over-year declines will probably start to get smaller since inventory is already very low.