The U.S. economy will grow less than previously estimated through 2012, reflecting a slump in confidence, limited consumer spending and a struggling housing market, a survey showed.

Gross domestic product in the world's largest economy will expand 1.7 percent this year, less than the May forecast of 2.8 percent, according to results of a survey by the National Association for Business Economics issued today in Washington. Growth in 2012 will average 2.3 percent after a previous projection of 3.2 percent.

Some 54 percent of respondents lowered their growth forecasts because they said the legislation stemming from the debt-ceiling debate will fail to reduce the long-term budget deficit. Unemployment projected to stay above 8.5 percent until late next year and Europe's debt crisis were also among panelists' top concerns.