“A lot of the sub-contractors are seeing an increase in business, yet they’re reluctant to hire staff or have an inability to hire skilled labor, so we’re seeing delays with framers coming onto our properties to frame the houses, we’re seeing challenges with drywall finishers and painters,” says Paul.

Many builders are also seeing supply constraints, as they did not expect to see such a surge in demand. Demand is strong in large part because there is such a small supply of existing homes for sale nationwide, and because banks have been exceedingly slow to work through foreclosures in some states.

(Read More: Home Prices See Record Gain in April)

“About one third of homes sold are completed, down pretty significantly from where we were earlier in the cycle, which was in the 50 to 60 percent range,” notes David Goldberg, an analyst at UBS.

While the major public builders have not voiced concern publicly over risks to their backlogs, the analysts that cover them say if rates continue to rise, they will not be able to ignore it.

—By CNBC’s Diana Olick. Follow her on Twitter @Diana_Olick or on Facebook atfacebook.com/DianaOlickCNBC.

Questions? Comments? RealtyCheck@cnbc.com

Article source: http://www.cnbc.com/id/100849156

Inventories are tightest on the low end of the market, where investors came in and bought most of the distressed properties and are now holding them as single-family rentals. There is about a four-month supply of homes priced under $100,000, while there is around a twelve-month supply of homes priced over $500,000. That’s why sales of those low-end homes are down 16 percent from a year ago, and sales of higher-end homes are up 25 percent, according to the Realtors.

(Read More: Housing’s Big Challenge: Student Debt)

“The housing shortage is going to continue,” claimed Yun, who says the builders need to ramp up housing starts by 50 percent. He admits that is unlikely to happen due to land, labor and supply constraints.

Weak supplies are pushing home prices up far faster than wage growth, which is keeping first-time buyers especially on the sidelines. These buyers made up just 30 percent of the market in March, compared to the historical norm of 40-45 percent. They just can’t compete with all cash investors.

(Read More: Why Housing Affordability Is at Risk)

But if prices get too high, investors could leave the market. Their share was already down in March to 19 percent compared to 22 percent just one month ago. The danger is that they will start to unload the homes they own, which would bring much-needed supply back but which could also turn home prices in the other direction.

Article source: http://www.cnbc.com/id/100660999