dia olick explains. >> reporter: across america single family homes and apartment buildings are going up, but the process is slow and expensive because of a severe shortage of skilled construction labor. developers small and large are feeling the pain, even warren buffet.av >> we six or so home building operations in vious places, kansas city and denver and austin, texas, and there is requirege of the labor in home building throughout the country. >> reporter: in the apartment market the shortage is actually causing an over s of new building. that may sound backwards, but here's why. first, the construction industry lost over a million skilled workers during the housing crash and most never returned. then, after therash when homeownership was at a record low, developers tried to meet the high demand for rental apartments, but it took them ag really lime to build what they started because they didn't have enough labor so a lot of the new buildings that were supposed to behe finished demand was high were not. >> so what happened, supply that was supposed to come out in 16 what came on i