What is a marine survey and do I need one?
Figures on this page are illustrative examples based on typical market conditions and an assumed 6.5 percent rate. They are not offers. Your terms are set by your lender.
A marine survey is an independent inspection of a boat's structure, systems, and condition by a credentialed surveyor that establishes its condition and market value. In one sentence: if you are financing a pre-owned boat you will need one, because lenders require it before approving the loan. It is required when financing a used boat and factors into your loan timeline.
A marine survey is an independent inspection of a boat’s structure, systems, and condition, performed by a credentialed surveyor, that establishes the vessel’s condition and market value.
If you are financing a pre-owned boat, you need one: lenders require a survey before approving the loan. Requirements vary by lender, though: some require a full survey with electrical and sea trials, some do not, and others may only ask for a sea trial. Even paying cash, a survey is the closest thing boating has to a home inspection, and skipping it means buying whatever problems the hull is hiding.
- An independent, credentialed inspection of hull, systems, and condition.
- Establishes the vessel's condition and market value.
- Required by lenders before financing a pre-owned boat.
- Worth doing even for cash buyers. It is boating’s home inspection.
What the surveyor actually does
The result is a written report covering condition and valuation, which goes to you, your insurer, and your lender.
A typical survey day
For a vessel under 80ft, the whole thing is usually done in a day. Larger boats can span several. Here is how the day tends to run.
- 1Dockside, early morning. Starting around 8 AM, the surveyor works through the systems at the dock: electronics, then under the hatches and floorboards, testing what runs and marking down anything that does not.
- 2Sea trial. The surveyor runs the engines across different RPM levels and confirms features like the anchor system, steering, and autopilot all work under way.
- 3Haul-out. Sometimes this comes before the sea trial. The boat is lifted so the surveyor can check the running gear, look for underwater damage, and sound the hull for delamination on fiberglass boats.
- 4The report. The surveyor combines the findings into one report, often several pages long. It goes to you, and you pass it on to your lender when one is required.
A surveyor's job is to find issues, and every boat has them. Just like a home inspection, there is always something. That list becomes your negotiating tool: you can ask the seller to cover a repair, split the cost, or agree who handles what.
Survey vs. home inspection
| Home inspection | Marine survey | |
|---|---|---|
| Required by lender | Usually optional | Required for pre-owned vessel loans |
| Credential | State home inspector license | SAMS or NAMS accreditation |
| Scope | Static structure | Structure plus propulsion, systems, and on-water performance |
| Valuation | Separate appraisal | Condition and valuation in one report |
Who pays and who chooses
The buyer pays for the survey and the haul-out, and the buyer chooses the surveyor. That independence is the point: the surveyor works for you, not the seller or the broker. Lenders typically accept reports only from surveyors accredited by the Society of Accredited Marine Surveyors (SAMS) or the National Association of Marine Surveyors (NAMS).
Where the survey fits in your financing
The survey happens after your offer is accepted and during the loan application, before closing. Getting pre-qualified before you make an offer means the survey is the only major step left once you find the boat. See the full timeline from pre-qualification to funding.
Takeaways
- Budget for a survey on any pre-owned purchase.
- Lenders will not fund a used-boat loan without one.
- Use the findings to negotiate price or walk away.
- Skipping it means buying whatever the hull is hiding.