The headlines say construction spending grew above expectations. The backward revision this month was significant enough to distort the month-over-month readings - and the rolling averages did improve.

Econintersect analysis:

• Growth decelerated 0.1% month-over-month and Up 5.2% year-over-year. The deceleration was due to a 1.5% additional growth in the previous month (backward revision)
• Inflation adjusted construction spending up 3.4% year-over-year.
• 3 month rolling average is 4.9% above the rolling average one year ago, and up 1.2% month-over-month. As the data is noisy (and has so much backward revision) - the moving averages likely are the best way to view construction spending.

Unadjusted Construction Spending - Three Month Rolling Average Compared to the Rolling Average One Year Ago

US Census Analysis:

• Up 2.2% month-over-month and Up 4.8% year-over-year (versus the reported 2.0% year-over-year growth last month).
• Market expected +0.3 % to 1.6% month-over-month (consensus +0.7) versus the +2.2% reported

Construction spending (unadjusted data) was declining year-over-year for 48 straight months until November 2011. That was almost four years of headwinds for GDP.

Indexed and Seasonally Adjusted Total Construction Spending (blue line) and Inflation Adjusted (red line)

This month's headline statement from US Census:

The U.S. Census Bureau of the Department of Commerce announced today that construction spending during April 2015 was estimated at a seasonally adjusted annual rate of $1,006.1 billion, 2.2 percent (±1.5%) above the revised March estimate of $984.0 billion. The April figure is 4.8 percent (±2.0%) above the April 2014 estimate of $960.3 billion. During the first 4 months of this year, construction spending amounted to $288.7 billion, 4.1 percent (±1.5%) above the $277.3 billion for the same period in 2014.

PRIVATE CONSTRUCTION - Spending on private construction was at a seasonally adjusted annual rate of $725.2 billion, 1.8 percent (±1.2%) above the revised March estimate of $712.1 billion. Residential construction was at a seasonally adjusted annual rate of $353.1 billion in April, 0.6 percent (±1.3%)* above the revised March estimate of $351.1 billion. Nonresidential construction was at a seasonally adjusted annual rate of $372.1 billion in April, 3.1 percent (±1.2%) above the revised March estimate of $361.0 billion.

PUBLIC CONSTRUCTION - In April, the estimated seasonally adjusted annual rate of public construction spending was $280.9 billion, 3.3 percent (±2.8%) above the revised March estimate of $271.9 billion. Educational construction was at a seasonally adjusted annual rate of $63.3 billion, 3.6 percent (±4.3%)* above the revised March estimate of $61.2 billion. Highway construction was at a seasonally adjusted annual rate of $87.1 billion, 8.5 percent (±9.0%)* above the revised March estimate of $80.3 billion.

Unadjusted Total Construction Spending Year-Over-Year (blue line) and Month-over-Month (red line) Change

Unadjusted Private Construction Spending Year-Over-Year (blue line) and Month-over-Month (red line) Change

Unadjusted Public Construction Spending Year-Over-Year (blue line) and Month-over-Month (red line) Change

Private construction had been fueling construction growth.

Public construction is expanding 2.7% year-over-year (up 3.1% year-to-date) - all numbers are unadjusted. Private construction is up 6.0% year-over-year (up 4.5% year-to-date) - all numbers are unadjusted. Construction spending would have to increase by more than 45% to equal the average for 2006, 2007 and 2008. The sector is in a deep depression.

Caveats on the Use of Construction Spending Data

Although the data in this series is revised for several months after issuing, the revision is generally minor. This series is produced by sampling - and the methodology varies by sector being sampled.

The headline data is seasonally adjusted. Econintersect uses the raw unadjusted data.Econintersect determines the month-over-month change by subtracting the current month's year-over-year change from the previous month's year-over-year change. This is the best of the bad options available to determine month-over-month trends - as the preferred methodology would be to use multi-year data (but the New Normal effects and the Great Recession distort historical data).

The data set for construction spending is not inflation adjusted. Econintersect adjusts using the BLS Producers Price Index - subindex New Construction (PCUBNEW-BNEW). However in the inflation adjusted graph in this post, FRED does not have this series - andEconintersect has used Producer Price Index: Finished Goods Less Energy (PPIFLE), Monthly, Seasonally Adjusted which has similar characteristics.

Construction (which historically is an major economic driver) is a literal shadow of its former self. Its contribution to GDP is down $400 billion from its peak level in 2006. The main driver of construction spending is the private sector. Here is the historical breakdown. The graph below uses US Census seasonally adjusted data.

Obvious from the above graph that public spending on construction is falling off, while private spending is slightly trending up. The overall effect is that construction spending is near the same place it was in early 2010.