The term ship under construction means the construction of a ship from the moment of laying the keel or similar procedure until the moment it is handed over to the buyer or customer. Market needs in the world dictate the need to build new ships. The idea of building a new ship starts from the fact that some legal entity, ie a potential shipowner or commercial company wants to gain a profile in the market by using the ship certain news, and for this reason begins negotiations with potential shipbuilders representing the shipyard. Pursuant to the provisions of the construction contract, the contracting authority is enabled to constantly monitor the construction process of the contracted ship, to control the quality of the material and to control the quantity of material intended for installation. The supervision of the contracting authority takes place in parallel with the supervision of the classification society.