NEW YORK ( TheStreet) -- National home prices are still undervalued relative to their fundamental value, Trulia economist Jed Kolko noted in a blog post Tuesday, soothing concerns the market is heading into bubble territory. While price gains in some markets are starting to rival those bubble years, this is still more reflective of a "rebound" from the bottom, according to Kolko. "Bubbles are notoriously difficult to predict and hard to confirm until after they've burst: it's impossible to be sure whether price gains are justified by fundamentals until, if and when, a bubble bursts," Kolko wrote. "San Francisco home prices, for instance, are the highest in the country; is that "irrational exuberance" by speculative homebuyers, or are those prices justified by strong job growth, high incomes, great weather, and constraints on the local housing supply?" Trulia looked at various underlying fundamentals in the housing market such as income, rents and historical prices to answer that question. If home prices rise beyond what people can afford, then the gains are unsustainable. Similarly, rent reflects "how much people value housing" even if they don't benefit from price appreciation. The study found that national home prices in the second quarter of 2013 were 7% undervalued relative to fundamentals. During the bubble, prices were 39% overvalued in the first quarter of 2006. In the bust that followed, prices became once again cheap relative to fundamentals and were 15% undervalued in the fourth quarter of 2011.
Prices are below their fundamentals in 91 of the 100 largest metros. Overvalued markets include Orange County, California, Los Angeles, San Jose, San Francisco and the Texas metros of Austin, San Antonio and Houston. But even these markets are not as overvalued today as they were in the bubble years. Orange County was 71% overvalued in the first quarter of 2006. Meanwhile, despite the strong gains in Las Vegas, the market remains among the most undervalued. Several Florida cities also remain undervalued relative to fundamentals. Housing analysts have become increasingly bullish on the housing recovery. Affordability is the best it has been in years, they say, thanks to rock bottom interest rates. Meanwhile, investor demand is helping clear distressed inventory from the market at a rapid pace, removing the overhang from the market. The lack of new construction in recent years and the dwindling supply of existing homes has led to a shortage of inventory nationwide, causing prices to surge even higher.