I can't speak for the US, but in the UK such sign boards are far less complicated than those seen in Germany. Generally they include construction company details, maybe just a logo. More recently there is a trend to apologise for any inconvenience during a rebuild/build and to give a phone number to contact in case of said inconvenience. I don't think you're going to find a direct equivalent of this term. I haven't yet seen 'Your construction company' or some such, but maybe you could use that instead.