What you need to register a boat in Massachusetts

Massachusetts requires registration for any boat with a motor, regardless of size, and for sailboats 17 feet or longer. You register through your town or city harbormaster's office, not through the Registry of Motor Vehicles. The harbormaster issues a registration number that you must display on both sides of the hull.

Registration is valid for one year from the date of issue. You'll need to renew it annually, and the harbormaster's office will send you a renewal notice before expiration. The cost varies by town but typically ranges from $25 to $75 for the registration itself, plus any local mooring or launch fees your town charges.

Key Takeaways

  • Register your boat through your town or city harbormaster, not the state Registry of Motor Vehicles.
  • Any motorized boat or sailboat 17 feet or longer must be registered in Massachusetts.
  • You need proof of ownership, the boat's hull identification number (HIN), and proof of residency to register.
  • Registration numbers must be painted on both sides of the hull in characters at least 3 inches tall.
  • Renewal happens annually and the harbormaster's office will contact you with instructions before your registration expires.

Documents and information the harbormaster will ask for

Bring a bill of sale, title, or other proof you own the boat. If you're registering a used boat, the seller should provide documentation showing they owned it. For new boats, the manufacturer's documentation serves as proof of ownership until you obtain a title.

You'll also need the boat's hull identification number (HIN), a 12-character code usually found on the starboard (right) side of the hull near the top. Have your driver's license or other state ID ready to prove residency. Some harbormasters may ask for proof of liability insurance, though this is not a statewide requirement — check with your specific town office.

How to find your town harbormaster's office

Search "[your town name] harbormaster" online, or call your town hall and ask for the harbormaster's office or waterways department. Many towns list harbormaster contact information and office hours on their municipal website. Some harbormasters work seasonally, so confirm office hours before you visit.

If your town is landlocked or has no harbormaster, contact the Massachusetts Environmental Police at 508-427-3151 for guidance on where to register. Coastal towns and towns with significant inland water access all maintain harbormaster offices.

Displaying your registration number on the hull

Once registered, you receive a number in the format "MA" followed by digits. Paint or permanently affix this number on both the port (left) and starboard (right) sides of the hull, as close to the bow as practical. Characters must be at least 3 inches tall, in a contrasting color to the hull, and clearly visible from the water.

The registration number is not the same as your boat's HIN. You keep the HIN permanently; the registration number changes if you move to a different state or let your registration lapse. Do not remove or obscure the number while the boat is in use.

Renewing your registration each year

The harbormaster's office will mail you a renewal notice before your registration expires. You can renew by mail, in person, or online if your town offers it. Bring the renewal notice and payment to the harbormaster's office, or follow the instructions on the notice if renewing by mail.

Renewal is straightforward if nothing about the boat has changed. If you've sold the boat, transferred ownership, or changed the boat's name, tell the harbormaster when you renew. If your registration lapses, you cannot legally operate the boat until you renew it.

What happens if you move or sell your boat

If you move out of state, you must register the boat in your new state and cancel your Massachusetts registration. Contact the harbormaster's office where you registered to request cancellation. If you sell the boat, the new owner must register it in their name and town of residence.

If you sell to someone in a different Massachusetts town, the buyer registers with their local harbormaster. You should notify your harbormaster in writing that you no longer own the boat, though the buyer's new registration will effectively replace yours in the system.

Mooring and launch permits separate from registration

Registration is different from a mooring permit or launch permit. Registration proves you own the boat and are allowed to operate it. A mooring permit gives you the right to keep your boat in a specific location in town waters. A launch permit allows you to use a town boat launch.

You may need all three documents depending on where you keep and use your boat. Some towns bundle these fees; others charge separately. Ask the harbormaster's office what permits you need based on where you plan to moor or launch your boat.

Frequently Asked Questions

Do I need to register a sailboat with no motor?

Only if it is 17 feet or longer. Sailboats under 17 feet do not require registration in Massachusetts, even if they have a small motor. The length is measured from the foremost part of the bow to the aftermost part of the stern.

What if I buy a boat from out of state?

You still register it through your Massachusetts town harbormaster. Bring the bill of sale or title from the previous owner and proof of your residency. The harbormaster will issue a new Massachusetts registration number regardless of where the boat was previously registered.

Can I register a boat if I don't live in Massachusetts?

No. You must be a Massachusetts resident to register a boat with a Massachusetts harbormaster. If you own property in Massachusetts but live elsewhere, contact the harbormaster's office to discuss your situation — some towns may have options, but residency is the standard requirement.

What if my registration number gets damaged or fades?

Repaint or replace it so it remains clearly visible. You do not need to contact the harbormaster unless the number itself changes. If the hull is repainted and the number becomes illegible, restore it to the same specifications before operating the boat.

Is there a penalty for operating an unregistered boat?

Yes. Operating an unregistered motorized boat or sailboat 17 feet or longer is a violation of Massachusetts boating law and can result in a fine. The amount varies but can be substantial. If your registration has expired, renew it when ready before using the boat.