Driven away in droves during downturn, construction workers return to find jobs have changed

The construction sector is making a rebound after losing more than 2 million jobs during the economic downturn.

In the past four years, hundreds of thousands of workers have returned to construction, making it among the nation's fastest growing job sectors.

Some markets lack enough construction workers to keep up with the pace of building. Four out of five contractors in a recent survey say they're having trouble filling positions such as carpenters, roofers and equipment operators.

Wages are going up in some hot construction markets such as North Dakota, Utah, Houston and Miami.

In some places, construction workers are getting signing bonuses of $5,000 to $10,000.