Total housing inventory at the end of May fell 3.5 percent to 3.80 million existing homes available for sale, which represents a 9.6-month supply at the current sales pace, down from a 10.1-month supply in April.

Yun said the appraisal problem is serious. “Lenders are using appraisers who may not be familiar with a neighborhood, or who compare traditional homes with distressed and discounted sales,” he said. “In the past month, stories of appraisal problems have been snowballing from across the country with many contracts falling through at the last moment. There is danger of a delayed housing market recovery and a further rise in foreclosures if the appraisal problems are not quickly corrected.”

An NAR practitioner survey in May showed first-time buyers accounted for 29 percent of transactions, and that the number of buyers looking at homes is nearly 10 percentage points higher than a year ago. “This is the time of year when we see large increases in the number of repeat buyers, who are benefitting from sales to entry-level buyers,” Yun said. “Investors appear less active, but are more prevalent in areas with large price corrections.”

NAR President Charles McMillan, a broker with Coldwell Banker Residential Brokerage in Dallas-Fort Worth, said appraisals and the tax credit are key issues. “To maximize the potential for a housing recovery and subsequent economic recovery, we need realistic appraisals that are based on proper comparisons and done by a local specialist,” he said. “In addition, the first-time buyer tax credit should be expanded to all buyers of primary homes regardless of income. Extending the credit into 2010 would allow more time for the market to catch up with underlying demand, in part because many families with children, who normally time their purchase based on school year considerations, do not have enough time to move before the start of school in late August.

“Freeing a pent-up demand in housing will absorb inventory at a faster pace, strengthen communities and stabilize home prices earlier,” McMillan said.