I work in the commercial construction industry so I can give you a bit of advice:
Heading onto an active jobsite (even after hours) to dive the dumpsters can get you in serious trouble. Our site managers may not even appear to be onsite- but they work long hours and after all the days labor and trades are gone from the site, the site manager is usually there. Every one of my guys would run you off and tell you not to come back, possibly threaten you with a trespass charge. It is to protect US more than you. Because if you jump in there and hurt yourself, that is not something a site manager wants to deal with.
On a ground up build- you won't find much of use anyway, unless you collect slugs of dried concrete, 10" or less pieces of cut-off lumber, halves of bricks, or bottles of dip spit. All the plumbers take anything of value (copper and brass) and even on a remodel, if the plumber doesn't want the "scrap" the demolition guys are astute at scooping it up. I tell all the guys onsite "Take it, take any scrap you want" because I'm paying $500 a dumpster. More scrap they take and save me space- the more debris I can put in it to maximize out my $500 bill for the 40 yarder!
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