• Despite booming sales in recent years, new homes are not selling as quickly as existing homes.
  • A new study by one of the nation’s leading housing economists found that short-term transitions, such as the conversion of foreclosures to rental in recent years, are sensitive to changes in market conditions and can be reversed if markets return to their original dynamics.
  • When markets dynamics revert to ownership from rental, a number of properties change status quickly. The resulting inventory increase acts like a buffer on demand, which could delay the demand for new construction.

Over the past three years, new homes have been on fire, increasing every year. Last year they were up 12.2 percent over 2015 and reached the highest annual total since 2006. With every sales increase, new homes are helping to fill the inventory deficits that plague most markets.

However, sales could have been even better.

December new home sales ended the year with a months’ supply of 5.6 months, 11.5 percent larger than a year ago. By comparison, existing homes, which also set a sales record last year, ended the year with a supply of only 3.6 months, a decrease of 7.7 percent from 2015.

A new study by one of the nation’s leading housing economists for the Research Institute for Housing America, a think tank operated by the Mortgage Bankers Association, raises even more reasons to be worried.

The study, by Professor Stuart S. Rosenthal of Syracuse University, investigated the market dynamics of houses as they transition from ownership to rental and vice versa.

His analysis of the housing boom and the bust recovery found that shot-term transitions, such as the conversion of foreclosures to rental, are very sensitive to changes in market conditions, such as falling price changes that may create defaults that transform homes into rentals.

Moreover, he believes short-term transitions, like the boom in single family rentals, can be reversed if market conditions revert back to their previous values.

One of the implications of his research is that the transition of homes from ownership-to-rental may delay the recovery of new home construction because as markets recover, a portion of the newly transitioned rentals will quickly revert back to ownership as prices rise and investors take their profits. These homes act like a buffer on demand for owner-occupied housing and have the potential to delay recovery of new construction.

Rosenthal notes new construction is already suffering.

While home prices are returning their 2006 peaks, permits for single-family construction are still far below their 2005 peak. Moreover, he believes the worst may be yet to come, since more homes are still transitioning from ownership to rental than from rental to ownership.

So if he’s right, the return to 2006 -level prices is a sign that market conditions are reversing and heralding the coming transition from rental to ownership.

That will be good news for existing home inventories, but not-so-good news for homebuilders.

Steve Cook is editor and co-publisher of Real Estate Economy Watch. Visit him on LinkedIn and Facebook.

Email Steve Cook.

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