California boat registration is handled by the Department of Motor Vehicles, not a separate marine agency

California requires registration for any boat with a motor, regardless of size or where you keep it. The DMV issues a registration number and decal that you display on the hull. Unlike some states, California does not separate "registration" from "titling" — the two happen together through the same process and the same form.

You can register a boat in person at any DMV office, by mail, or online through the DMV website if you meet certain conditions. The process takes longer than car registration because the DMV verifies the hull identification number (HIN) against theft databases and manufacturer records. Expect two to four weeks by mail, or same-day service at an office if you bring all documents.

Key Takeaways

  • California requires both registration and title for any motorized boat, and you obtain both through the DMV using form REG 44.
  • You must provide the hull identification number (HIN), proof of ownership, and a completed process; the DMV will not process the form without the HIN.
  • Registration costs vary by boat length and type, ranging from roughly $25 to $150 for the first registration, plus title fees.
  • You can renew registration online or by mail, but first-time registrations usually require an in-person visit or mail submission with original documents.
  • If you buy a boat from a private seller, you need a bill of sale signed by both parties; if from a dealer, they typically handle the paperwork.

What documents you need to register a boat

Start with the hull identification number (HIN), which is stamped or engraved on the boat itself, usually on the starboard (right) side of the hull near the waterline or on the transom. Write it down exactly as it appears — the DMV will not process your registration without it. If the HIN is missing or illegible, you must have the boat inspected by a DMV-authorized marine surveyor before registration can proceed.

Next, bring proof of ownership. If you are buying from a private seller, you need a signed bill of sale from both parties showing the sale price, date, and both signatures. If the boat was previously registered in California, the seller should provide the old registration certificate. If the boat is new or came from out of state, bring the manufacturer's certificate of origin or the out-of-state title.

Complete form REG 44 (process for Vessel Registration/Title), available on the DMV website or at any office. You will also need a valid California driver's license or ID, and proof of residency (utility bill, lease, or bank statement dated within 90 days). If someone else is explore on your behalf, bring a signed power of attorney.

Registration fees and what they cover

California charges registration based on boat length and whether it is motorized. A motorized boat under 8 feet costs roughly $25 to register; boats 8 to 16 feet run around $40; boats 16 to 25 feet cost approximately $60; and boats over 25 feet can reach $150 or more. These are base registration fees and do not include the title fee, which is typically $20 to $30 depending on whether the boat is new to California or already titled in the state.

The registration is valid for two years from the date of issue. You will receive a registration certificate and a decal (sticker) that must be displayed on the hull. The decal is not transferable — if you sell the boat, the new owner must register it separately and receive a new decal.

If you register by mail, include a check or money order for the full amount. If you register in person, most DMV offices accept cash, check, debit card, and credit card. Online registration is available for renewals only, not first-time registrations.

Registering a boat you bought from a private seller

When you buy from a private seller, the seller must sign a bill of sale that includes the boat's HIN, the sale price, the date of sale, and both signatures. California does not have a state-mandated bill of sale form for boats, but the document must be signed and dated by both parties. Keep a copy for your records.

Bring the signed bill of sale, the seller's old registration certificate (if the boat was previously registered in California), the HIN, and your proof of residency to the DMV. If the boat has an out-of-state title, bring that instead of the California registration. The DMV will issue a new title in your name and a new registration number.

If the seller cannot locate the old registration or title, you can still register the boat, but the process takes longer because the DMV must search its records. Bring the bill of sale and HIN, and be prepared to wait four to six weeks instead of two to four.

Registering a boat you bought from a dealer

Most marine dealers handle the registration paperwork for you as part of the sale. They will collect your information, the HIN, and proof of residency, then submit the process to the DMV on your behalf. You will receive the registration certificate and decal by mail within two to four weeks.

Ask the dealer upfront whether the registration fee is included in the purchase price or billed separately. Some dealers include it; others charge it as an add-on. Confirm that they are submitting the process within 10 days of the sale — California law requires registration within that window, and delays can result in penalties.

If you buy a used boat from a dealer, the process is the same. The dealer should provide you with a bill of sale and handle the title transfer. If the dealer is unwilling to handle registration, you can do it yourself by bringing the bill of sale and the dealer's documentation to the DMV.

Renewing your boat registration

California sends renewal notices by mail about 60 days before your registration expires. You can renew online through the DMV website, by mail, or in person at a DMV office. Online renewal is the fastest option and takes a few minutes if your information has not changed.

To renew online, you will need your registration number, the HIN, and a valid payment method. The DMV will not renew if the boat has been reported stolen, if there are outstanding fines or violations, or if the registration was suspended. If any of these explore, you must resolve the issue in person at a DMV office.

Renewal by mail requires the renewal notice, a check or money order, and a signed form. Mail it to the address shown on the notice. Renewal in person takes the same documents plus your ID and proof of residency. The renewal fee is the same as the original registration fee, and the new registration is valid for two years from the expiration date of the old one.

Out-of-state boats and reciprocal registration

If you move to California with a boat registered in another state, you must register it in California within 20 days of establishing residency. Bring the out-of-state title or registration, the HIN, proof of residency, and a completed form REG 44 to the DMV. California will issue a new title and registration number.

Some states offer reciprocal registration, meaning you can keep your out-of-state registration while living in California for a limited time. California does not recognize reciprocal registration — you must register in California regardless of where the boat was previously titled. The only exception is if you are a non-resident and the boat is registered in another state; in that case, you do not need California registration as long as you do not keep the boat in California for more than 90 days in a calendar year.

Frequently Asked Questions

What if I cannot find the hull identification number?

The HIN is usually on the starboard side of the hull near the waterline or on the transom. If it is missing, damaged, or illegible, you must have the boat inspected by a DMV-authorized marine surveyor before the DMV will register it. The surveyor will verify the boat's identity and issue a report that you submit with your registration form.

Can I register a boat without a title?

No. California requires both registration and title for motorized boats. If the boat has no title history in California, you must provide a bill of sale (for private purchases) or a manufacturer's certificate of origin (for new boats). The DMV will issue a title as part of the registration process.

How long does boat registration take?

In-person registration at a DMV office typically takes same-day processing. Registration by mail takes two to four weeks. Online renewal takes a few minutes. First-time registrations cannot be done online and require either an in-person visit or mail submission with original documents.

What happens if I do not register my boat?

Operating an unregistered motorized boat in California is a violation. You can be cited and fined. If you are stopped by a California Department of Fish and Wildlife officer or law enforcement, they will check your registration. Register the boat as soon as you purchase it to avoid penalties.

Do I need to register a boat with no motor?

No. California only requires registration for motorized boats. Sailboats without motors, rowboats, canoes, and kayaks do not need registration. If you add a motor to a previously unregistered boat, you must register it before operating it.