the present invention relates to a method of constructing a semi - submersible unit comprising a side wall , wherein the method comprises the steps of : placing a hull in a body of water , the hull comprising an opening for receiving an end piece , the end piece constituting at least a portion of the side wall ; lowering the hull into the body of water , and connecting a deck structure to the hull to form a semi - submersible unit . the present invention also relates to a kit for constructing a semi - submersible unit comprising a side wall , wherein the kit comprises hull comprising an opening and a deck structure . moreover , the present invention relates to a semi - submersible unit constructed according to the method and / or from a kit according to the present invention .