The July decline was the largest since a 7.2 percent drop in April 1984.
February's decline was the biggest since a 9 percent drop in January 1988.
But building permits fell 5.4 percent last month, the biggest decline since a 9 percent drop in January.
The decline was the steepest since a 12.7 percent drop in February.
January's 3 percent decline in total orders was the biggest since a 7.4 percent drop last July.
It was the biggest quarterly improvement since a 20.1 percent drop in the final quarter of last year.
It was the first decline since a 3.3 percent drop in March.
Last month's decline was the largest since a 5.3 percent drop in December.
The October decline was the largest since a 6.7 percent drop in January, 1987.
It was the first decline since a 1.2 percent drop last April.