Buying a boat with a Sale and Purchase Agreement in NZ

Updated for 2026

Whether you’re buying your first trailer boat or upgrading to a bigger launch, getting the paperwork right matters just as much as the sea trial. A Sale and Purchase Agreement (S&P Agreement) is the document that protects both buyer and seller when a boat changes hands, and in New Zealand’s private boat market, most transactions happen without one.

That’s a risk worth avoiding.

Why you need an S&P agreement when buying a boat

New Zealand has no mandatory registration system for most recreational vessels. Unlike a car, there’s no WoF, no rego, and often no paper trail connecting a boat to its owner. When you buy privately, you’re largely relying on the seller’s word, unless you put something in writing.

A signed S&P Agreement protects you by:

• Confirming the agreed price and payment terms in writing
• Recording that the vendor is the legal owner and the boat is free of debt
• Setting clear conditions around sea trials and surveys
• Establishing what happens if either party pulls out

For the seller, it’s equally useful. It confirms the buyer’s commitment, records the deposit terms, and limits the risk of disputes after the boat has changed hands.

If the transaction is a significant one for you financially, it’s worth getting a lawyer involved. But for most private boat sales in New Zealand, a well-drafted template will do the job.

What to check before you sign anything

Before you get to the agreement itself, do your homework on the vessel.

Run a PPSR check. The Personal Property Securities Register is New Zealand’s official database of financial interests over personal property, including boats. A search costs around $10 and tells you whether a finance company or other lender holds a security interest over the vessel. If a boat has an outstanding loan against it, that debt can follow the boat to you as the new owner. It has happened to NZ buyers before, with costly consequences.

Check the NZ Boat Register. The NZ Boat Register is a free, voluntary platform where owners can record their vessel details, photos, and serial numbers. If the seller has registered their boat, it’s a good sign of transparency and makes it easier to verify the vessel’s history. You can also check whether a boat has been reported stolen. See our article on the Mariner blog for more details.

Verify the seller’s identity. NZ Police recommend always meeting a private seller at their home, not a car park or boat ramp, so you can confirm they actually live there. Someone who won’t meet at home, or can’t provide ID that matches the boat’s paperwork, is a red flag worth taking seriously.

What goes into a boat sale and purchase agreement

Mariner’s free sample S&P Agreement covers all the key sections you’d want in a private boat sale. Here’s what each section does.

• The basics

  The agreement starts with the vessel details (name, make, model, sail number if applicable), the names of both parties, and the date of signing. Getting these right matters. Vague descriptions create room for disputes later.

• Purchase price and payment

  This section records the agreed sale price and how payment will be made. In most private sales, the buyer pays a deposit on signing, with the balance due once the sea trial is completed to their satisfaction. Ownership doesn’t transfer until cleared funds are confirmed, which protects the seller if a payment falls through.
  

• Conditions of sale

  This is where you record whether a boat survey, mechanical inspection, and sea trial are required or waived. Don’t skip this section. It sets the conditions under which the sale proceeds, and what happens if those conditions aren’t met.
  

• Sea trial

  The agreement allows 14 days from signing to arrange the trial, and 20 days maximum for it to be completed, weather permitting. If the buyer isn’t satisfied with the vessel or her gear, they have two days after the trial to notify the seller in writing. At that point, the agreement is cancelled and the deposit is refunded in full.
  

• Survey and inspection

  If a survey is required, the seller places the vessel on the hard at their own risk and expense. The buyer arranges and pays for a recognised marine inspector to carry out the inspection within 14 days of signing. If defects are found, the buyer can cancel the agreement and get their deposit back, or require the seller to remedy the issues. The seller then has the option to fix the problem or cancel.
  

• Ownership and clear title

  The vendor warrants they are the sole legal owner of the vessel, and that it will pass to the purchaser free from any mortgage, charge, or encumbrance. This is where your PPSR check becomes relevant. The agreement records the vendor’s guarantee of clear title in writing, so if something comes up later, you have a signed document to rely on.
  

• Remedies on default

  If the buyer fails to settle by the agreed date and doesn’t respond to a written seven-day notice, the seller can cancel the agreement and keep the deposit. Interest of 17% per annum applies to any unpaid balance from the due date. This protects the seller from a buyer who commits and then goes quiet.
  

• Risk and prior charges

  The vessel remains the seller’s risk until settlement. The seller is also responsible for all outstanding costs, including mooring, slipping, storage, and maintenance, up to the settlement date. These clauses prevent disagreements about who is liable if something happens to the boat before handover.
  

• Acknowledgement

  The buyer signs to confirm they’ve entered the agreement based on their own inspection, not on verbal promises from the seller. This is standard for private secondhand sales in New Zealand. There is no implied warranty of fitness for purpose when buying privately.

Getting the sample agreement

Mariner has produced a free sample S&P Agreement that covers all of the above. It’s similar to agreements Mariner staff have used when buying and selling their own boats - you can download it here.

We’re not lawyers, and we’d encourage you to get legal advice for any large or complicated transaction. But for most private boat sales in New Zealand, this template gives both parties a solid starting point.

Once the deal is done

After the agreement is signed and the boat has changed hands, it’s worth registering your new vessel on the NZ Boat Register if it isn’t already. It takes five minutes, it’s free, and it creates a clear digital record connecting you to the boat. That’s useful for insurance claims, emergency response, and any future sale.

This article is provided for general information purposes only and does not constitute legal advice. For advice specific to your situation, consult a qualified lawyer.