Typically, a boat Hull Identification Number is issued by the vessel’s manufacturer or importer. However, if your vessel is home-built, then they can be issued by your respective State Registrars/DMVs.
If your vessel measures at least five net tons and is wholly owned by a citizen of the United States, you can apply for Coast Guard documentation for your vessel. You can apply for Initial Vessel Documentation through this form here.
Should you wish to make your home-built vessel a documented vessel, ensure it meets the standards above and apply for a Hull Identification Number from your State Registrar as you go through the vessel documentation process.