Total construction spending registered a small gain in April but showed mixed patterns among major segments, according to a recent analysis of new Census Bureau data by the Associated General Contractors of America.

“The report underscores patterns that have prevailed for several months: surging home and apartment construction, volatile private nonresidential activity and shrinking public investment,” said Ken Simonson, the association's chief economist. “This uneven result is leading to selected materials cost increases and localized reports of worker shortages despite continuing hard times for many contractors and workers.”

Construction put in place totaled $861 billion in April, rising 0.4% since March and up 4.3% since April 2012. Private residential construction spending inched down 0.1% in April but jumped 19% from a year earlier. Private nonresidential spending climbed 2.2% for the month and 0.6% year-over-year. Public construction spending dropped 1.2% for the month and 5.1% over 12 months.

“New apartment and home construction were standouts again and should remain very strong for the rest of 2013,” Simonson said. “Growth has been more inconsistent among private nonresidential categories, reflecting reluctance of businesses to commit to investing in structures amid ongoing economic uncertainty. Meanwhile, there appears little prospect that public agencies will start investing in infrastructure any time soon.”

Over the past 12 months, the biggest jump in construction spending has occurred in new multifamily construction, which soared 3.4% for the month and 49% year-over-year. New single-family construction rose 1.4% and 39%, respectively. But overall residential gains were held down by a decline in improvements to existing structures of 3.3% for the month and 7.0% from April 2012.

The largest private nonresidential category, power construction—which includes oil and gas field and pipeline projects as well as power plants, renewable power and transmission lines—leaped 10.8% in April following a steep downward revision in the March estimate. Despite the one-month surge, power construction spending was down 2.8% since April 2012. The second-largest private segment, manufacturing construction, slumped 2.6% for the month but added 2.2% over 12 months.

Highway and street construction, the largest public category, increased 0.5% in April but slipped 3.4% from a year earlier, Simonson noted. The next largest public niche, educational construction, tumbled 4.4% and 13%, respectively, he added.