In the US, as an amateur boat builder in 2012, the answers is yes. The boat will not comply with the ABYC and USCG safety standards but those apply only to production boats.US Coastguard Safety Standards
In the US, things may vary slightly by state but the general procedure is the same. You should keep your invoices for materials. Once the boat is complete or close to completion, go to the local DMV (Department of Motor Vehicles) with your invoices and request a title. After checking your invoices and filling a form with the main characteristics of the boat, you will be given a title. Use the title to pay the local registration taxes. This will give you a registration number and you are ready to go.
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