Trulia’s Bubble Watch shows whether home prices are overvalued or undervalued relative to their fundamental value by comparing prices today with historical prices, incomes, and rents. The more prices are overvalued relative to fundamentals, the closer we are to a housing bubble – and the bigger the risk of a price crash. Sharply rising prices aren’t necessarily a sign of a bubble. By definition, a bubble develops when prices look high relative to fundamentals.

Bubble watching is as much an art as a science because there’s no definitive measure of fundamental value. To try to put numbers on it, we look at the price-to-income ratio, the price-to-rent ratio, and prices relative to their long-term trends. We use multiple data sources, including the Trulia Price Monitor, as leading indicators of where home prices are heading. We combine these various measures of fundamental value rather than relying on a single factor because no one measure is perfect. Trulia’s first Bubble Watch report, from May 2013, explains our methodology in detail. Here’s what we found this quarter. (This report contains larger-than-usual revisions of previous Bubble Watch estimates. See note.)

We estimate that home prices nationally are 3% undervalued in the third quarter of 2014 (2014 Q3). In 2006 Q1, during the past decade’s housing bubble, home prices soared to 34% overvalued before dropping to 13% undervalued in 2012 Q1. One quarter ago (2014 Q2), prices looked 5% undervalued; one year ago (2013 Q3), prices looked 6% undervalued. This chart shows how far current prices are from a bubble…

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http://seekingalpha.com/article/2533125-bubble-watch-home-prices-3-percent-undervalued-with-few-metros-bubbling-up?ifp=0