Yeah I've seen the same thing, I've got plenty of anecdotal evidence and some papers I've read on the wage suppression in construction because of illegal immigrants. They've had a suppressing impact on wages in that industry, no question. How much, and whether it's severe, I don't think it easy to know. I do know that the net effect, taking into account the benefits to homeowners and contractor bottom-lines, as well as the improvement in quality of life for every homeowner that couldn't find a reliable, affordable housekeeper, gardener or nanny, is real and notable. I don't think for a second we can ignore those positive impacts.
I would further add that construction, like a lot of manual labor jobs, aren't as desired by native-born Americans, and were in short supply before the boom in illegal immigration from Mexico. There's no question to anyone in the real estate industry that you couldn't meet the demand of construction without illegal labor, which is unfortunate but true, so in many ways those south of the border saw that, heard about that demand and it's a big reason they come, because their labor was so desired. It's a very natural free market force. But the focus shouldn't be on making it illegal to hire that labor, it should be on enforcing stricter wage laws on contractors, including OT, and making sure that the border is both safer and better monitored so there are fewer illegal immigrants coming across. That last part conservatives are right about, just for the wrong reasons (which, to about half of conservatives, is because illegal immigrants are "Foreigners!"). But that border security needs to be simultaneous with more federal dollars flowing to legal migration causes, because the demand for construction labor in particular is critical to meeting the demands of the economy. Real estate has an outsized impact on growth, always has.