Ah, thank you for clarifying. I asked because although I don’t know specifics for all areas, my parents (both former union members, retired for about a decade, and disgusted with unions now), been involved in the building of many houses (electricians). My dad did, however, work for a private contractor for a decade or so, too, off and on, so maybe he built houses there. I was unaware that no labor unions built residential houses, I suppose you learn something new everyday! Thanks again for clearing that up, and sorry I was confused.
Like you, I can't speak for all areas of the country. But here, the union electrical jobs are for big projects like power plants, large commercial buildings, overpasses, etc. but not generally for housing construction (single family homes). There may be a local company that is organized but it is definately not a big percentage of any residential work.