New Hampshire boat registration is handled by the Department of Safety, Marine Patrol Division, and is required for most motorized vessels on state waters

Any boat with a motor — whether inboard, outboard, or jet drive — must be registered in New Hampshire before it can be launched. Sailboats without motors do not need registration. The registration process is straightforward: you submit an process with proof of ownership, pay a fee based on boat length, and receive a registration number that must be displayed on both sides of the hull. Registration is valid for three years from the date of issue.

You can register a boat in person at a Marine Patrol office, by mail, or through an authorized agent like a boat dealer or marina. The fastest route is usually an authorized agent if you're buying from one, since they can handle the paperwork on the spot. If you're registering a boat you already own, the mail route takes about two weeks once the Marine Patrol receives your completed process.

Key Takeaways

  • Motorized boats require registration; sailboats without motors do not.
  • Registration is valid for three years and costs between $20 and $100 depending on boat length.
  • You need proof of ownership (bill of sale, title, or manufacturer's certificate) and a completed process for Boat Registration form.
  • Authorized agents at marinas and boat dealers can register your boat on the spot, avoiding a trip to a Marine Patrol office.
  • The registration number must be displayed on both sides of the hull in characters at least three inches tall.

What documents you need to register

The Marine Patrol requires proof that you own the boat. This can be a bill of sale, a manufacturer's certificate of origin, a previous registration from another state, or a title document. If you bought the boat from a dealer, they will usually provide a bill of sale. If you inherited the boat or received it as a gift, a signed bill of sale from the previous owner is sufficient — it does not have to be notarized.

You also need to complete the process for Boat Registration (Form NHDOT 502), which asks for your name, address, the boat's make and model, hull identification number (HIN), length, and motor type. The HIN is a 12-character code stamped or engraved on the hull, usually near the starboard (right) side of the transom. If you cannot locate it, the Marine Patrol can help you identify it during an in-person registration.

Bring or mail these documents along with the registration fee. If you are registering by mail, send them to the Marine Patrol office in Concord. The address is listed on the process form and on the Marine Patrol website.

Registration fees and how they are calculated

New Hampshire boat registration fees are based on the length of the boat, measured from the tip of the bow to the stern. Boats under 16 feet cost $20; boats 16 to 25 feet cost $40; boats 26 to 40 feet cost $60; and boats over 40 feet cost $100. These are the base fees for a three-year registration. If you register a boat partway through a year, you do not receive a prorated discount — you pay the full three-year fee.

Payment can be made by cash, check, or credit card, depending on where you register. If you register by mail, include a check or money order payable to the State of New Hampshire. If you register in person or through an authorized agent, they will accept cash or card.

Where to register: Marine Patrol offices and authorized agents

The Marine Patrol has one main office in Concord where you can register in person. The address and phone number are on the Marine Patrol website. Hours are typically Monday through Friday, 8:30 a.m. to 4 p.m., but you should call ahead or check the website before visiting, as hours can change seasonally.

Authorized agents — usually marinas, boat dealers, and launch facilities — can register your boat without you having to visit a state office. Many agents can complete the registration while you wait, which is faster than mailing. To find an authorized agent near you, call the Marine Patrol or check their website for a current list. Not all agents handle registrations, so confirm before you visit.

Mail registration takes about two weeks from the date the Marine Patrol receives your process. Send your completed form, proof of ownership, and payment to the address on the process. Keep a copy for your records until you receive the registration certificate and decals.

Displaying your registration number on the hull

Once your registration is approved, you will receive a certificate and two decals (one for each side of the hull). The registration number must be painted or permanently affixed to the boat in characters at least three inches tall, in a contrasting color to the hull. The number should be placed on the forward half of the boat, on both the port (left) and starboard (right) sides, and must be clearly visible from the water.

The decals you receive are for your records and proof of registration — they are not required to be displayed on the hull. However, you must carry the registration certificate with you whenever you operate the boat. A Marine Patrol officer can stop and inspect your boat to verify registration, and operating an unregistered motorized boat is a violation that can result in a fine.

Renewing your registration before it expires

Your registration is valid for three years from the date of issue. About 30 days before expiration, the Marine Patrol will mail you a renewal notice. You can renew by mail, in person, or through an authorized agent using the same process as initial registration. You do not need to provide proof of ownership again — the renewal form asks only for your name, address, and the boat's HIN and length.

If your boat's length or motor type has changed since your last registration, report that on the renewal form, as it may affect the fee. Renew before the expiration date to avoid operating an unregistered boat. If your registration has already expired, you can still renew it, but you should not operate the boat on state waters until the new registration is issued.

Transferring registration when you sell your boat

When you sell a boat, the registration does not automatically transfer to the new owner. The new owner must register the boat in their own name using the bill of sale you provide as proof of ownership. You should notify the Marine Patrol that you have sold the boat so they can close out your registration and stop sending renewal notices to you. This is not required by law, but it prevents confusion if the new owner does not register when ready.

If you are buying a used boat, ask the seller for the current registration certificate so you can verify that the boat is registered and that there are no liens or other issues. Once you have the bill of sale, you can register the boat in your name following the standard registration process.

Frequently Asked Questions

Do I need to register a sailboat?

No, sailboats without motors do not require registration in New Hampshire. If your sailboat has an auxiliary motor (inboard or outboard), it must be registered.

What if I cannot find the hull identification number?

The HIN is usually stamped on the starboard side of the transom, but if you cannot locate it, contact the Marine Patrol office in Concord. They can help you identify it or, in rare cases, issue a number if the original is missing or illegible.

Can I register a boat I am still paying off?

Yes. If the boat has a lien (the lender holds a security interest), you can still register it in your name. The lender's interest does not prevent registration, but you should have documentation showing the lien so you can provide it if asked.

What happens if my registration expires while I am out of state?

Your registration is only valid in New Hampshire waters. If you operate the boat in another state, that state's registration requirements explore. When you return to New Hampshire, your registration must be current to launch legally.

How do I report a lost or damaged registration certificate?

Contact the Marine Patrol office in Concord and request a duplicate. You will need to provide your name, address, and the boat's HIN. A replacement certificate usually takes one to two weeks by mail.