Builder confidence in the market for newly-built, single-family homes rose one point to 47 on the National Association of Home Builders/Wells Fargo Housing Market Index (HMI).

"The March HMI mirrors last month's sentiment, as builders continued to be affected by poor weather and difficulties in finding lots and labor," said NAHB Chairman Kevin Kelly, a home builder and developer from Wilmington, Del. 

"A number of factors are raising builder concerns over meeting demand for the spring buying season," said David Crowe, NAHB chief economist . "These include a shortage of buildable lots and skilled workers, rising materials prices and an extremely low inventory of new homes for sale."

Derived from a monthly survey that NAHB has been conducting for 30 years, the NAHB/Wells Fargo Housing Market Index gauges builder perceptions of current single-family home sales and sales expectations for the next six months as "good," "fair" or "poor." The survey also asks builders to rate traffic of prospective buyers as "high to very high," "average" or "low to very low." Scores for each component are then used to calculate a seasonally adjusted index where any number over 50 indicates that more builders view conditions as good than poor.

The index's components were mixed in March. The component gauging current sales conditions rose one point to 52 and the component measuring buyer traffic increased two points to 33. The component gauging sales expectations in the next six months fell one point to 53.

The three-month moving averages for regional HMI scores all fell in March. The Northeast dropped three points to 35, the Midwest fell three points to 53, the South posted a four-point decline to 49 and the West registered a two-point drop to 61.

HMI tables can be found at nahb.org/hmi. More information on housing statistics is also available at housingeconomics.com.