The construction aggregate conceals different sector estimates. In its March 1, 2017 report, Census put January private construction at a seasonally adjusted annual rate of $911.6 billion, up an estimated 0.2 percent. Its 90 percent sampling margin was 0.8 percentage point, so the apparent increase did not establish a positive direction. [pr201701][pr201612]

Public construction's estimated 5.0 percent decline, by contrast, had a 1.8-point sampling margin that excluded zero. The public annualized rate was $268.7 billion. Private residential construction was separately estimated at $476.4 billion annualized, with an uncertain monthly direction. Calling this a general housing surge would erase both the private-sector scope and the uncertainty attached to that estimate. [pr201701][pr201612]

The February 1 release adds full-year context: it estimated total construction during 2016 at $1,162.4 billion, up 4.5 percent with a 1.0-point sampling margin. Public construction's annual estimate of a 1.0 percent decline had a 1.5-point margin and was uncertain. These annual totals describe a different period and measurement frame from January's annualized rates. [pr201701][pr201612]

For readers assessing investment incentives, the first task is to identify which sector actually supplies the signal. The releases do not show that private spending displaced public projects, that policy caused the divergence or that dollar changes equal changes in physical output. Those would require additional evidence. Census's preliminary figures and sampling-only intervals also leave room for revision and other errors; this is a composition analysis, not an investment recommendation or a demonstrated causal mechanism. [pr201701][pr201612]

Source documents

  1. Monthly Construction Spending, January 2017https://www.census.gov/construction/c30/pdf/pr201701.pdf
  2. December 2016 Constructionhttps://www.census.gov/construction/c30/pdf/pr201612.pdf