Thank you so much for submitting designs. We like the drop shadow of #7 as it gives the design depth but not crazy about the font -- "i" resembles a "U". Also, can you make inc very secondary to the logo...right now it is too prominent. for example, on #7, we would not want ICI AND Inc under the logo...we are fine with Inc under the logo in a very subtle way.
#5 is fun bit too a bit too playful for us...we like the idea of using interlocking designs that resemble steel beams but it seems more of a desingers logo rather than a construction company that has to make every angle work together. Hope this makes sense.