My family does not hire illegals. And in my experience those who do hire illegals don't build to housing codes. I tell you horror stories. I even know of a two-story house that is held together by hardyboard. Hardyboard is not even support to be used in Georgia because the high humidity destroys it.
Of course things are finally changing, because starting next year, by a new state law only state licensed contractors can build houses and these jacklegs will be put out of business.
They moved lumber, bricks, carried squares of shingles, etc. They cleaned up, monitored the fire, etc on another day.
So the illegals can be hired easily.