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Inventory Index: Figuring Housing Inventory in Months

By
Real Estate Agent with I serve buyers and sellers everywhere in San Luis Obispo County BRE #01839596

I never was much of a numbers person, but I am finding that some numbers are indispensable in the business of real estate. One such number is the Inventory Index (II), which gives you a quick view of how many months it will take to deplete the current housing inventory.

It's generally considered that much under 3 months is a seller's market, while much over 5 months means you are in a buyer's market.

EASY TO FIGURE

The II can be applied to a city, county, state, or even a neighborhood, if there are enough sales and listings to make the index meaningful. Define your area, then determine how many listings are currently available (include for sale only, not pending, contingent, etc.). I use only SFRs, condos, and PUDs, and do not include mobile homes, apartment buildings, etc., though you can calculate the II for these as well.

Then find the number of sales in the last month in the same area, and divide the number of available listings by the number of sales in the past month. The result is the II, or about how many months worth of houses remain to be sold.

Here are the figures for some of our local cities:

  • San Luis Obispo: 6.5 months
  • Arroyo Grande: 8.0 months
  • Morro Bay: 7.7 months
  • Atascadero: 5.1 months
  • Paso Robles: 6.8 months

Despite the improvement in the local market, these figures show we are still very much in a down market for sellers.

Posted by

Sonsie Conroy             
CA Lic. No. 01839596
Keller Williams Central Coast Realty
San Luis Obispo, CA
Cell: 805-235-2351
Email: sconroy@slonet.org
Website:www.sloliferealestate.com

Lydia Pollard
RE/MAX Realty Specialists Inc. Brokerage - Mississauga, ON

Sonsie,

Thanks for the explanation.
I didn't know it was so easy to figure out.

Aug 13, 2010 05:37 PM
John Pusa
Glendale, CA

Sonsie - Excellent information on the index figuring housing inventory. Thank you for an educational blog.

Aug 13, 2010 05:57 PM
Harrison K. Long
HomeSmart, Evergreen Realty - Irvine, CA
REALTOR , GRI, Broker associate, Attorney

Sonsie ... I like your calculating market time by using number of open listings (numerator) and divide that by number of homes sold the past thirty days (denominator), and that would equal the basic number of numbers that it would theoretically take to sell all homes now for sale on the market.

Some market analyzers around here include number of pendings and backups with the sold, which skews the figures unrealistically.

Aug 13, 2010 06:10 PM
Not a real person
San Diego, CA

We're kind of mixed down here. I think probably about 80% of our neighborhoods are neutral or in a seller's market while the other 20% are in a buyer's market.

Happy Labor Day Weekend!

Sep 03, 2010 11:14 PM
Jim Frimmer
HomeSmart Realty West - San Diego, CA
Realtor & CDPE, Mission Valley specialist

I’ve never found any use for the housing inventory statistic, at least no use that makes any difference to buyers and sellers and I do my job correctly.

Nov 18, 2010 08:10 AM
Sonsie Conroy
I serve buyers and sellers everywhere in San Luis Obispo County - San Luis Obispo, CA
Energetic, Enthusiastic, Knowledgeable Realtor

Jim, you can certainly do your job well without having this information at your fingertips, but I find that sellers want an idea of how long it might take to sell their homes. This figure gives an estimate, which of course you can improve upon by pricing it right, making it attractive, etc.

Nov 26, 2010 12:02 PM
Not a real person
San Diego, CA

I’ve never found much use for the inventory number because I’ve never seen anyone want to buy all the inventory. It’s all about price, condition, location.

Jan 26, 2011 12:50 PM
Sonsie Conroy
I serve buyers and sellers everywhere in San Luis Obispo County - San Luis Obispo, CA
Energetic, Enthusiastic, Knowledgeable Realtor

Ray, I don't use it in every instance, but sellers often do want to know about how long they can expect their properly-priced, well-located, clean and attractive home might take to sell.

Of course that inventory number really isn't any good at all if you are dealing with a home that has an incurable defect such as being next to a freeway or in a blighted neighborhood. The only fix for those kinds of conditions is price. Somebody will buy that home if it is priced low enough to "cure" the defect.

Jan 26, 2011 01:43 PM