Yes, building caissons is definitely not a “Do It Yourself” activity, and you will need to get a qualified, experienced contractor to do this work.  You will also need a competent engineer to design the caisson system, and inspect the work after its completed.  Weinstein Construction can partner with civil engineering firms near you to provide you with exceptional quality engineering plans for your project. The City’s building inspector will also inspect the work.  In short, you will need experts such as the professionals at Weinstein Construction to do this work for you!