What a Marine Survey Covers and What It Costs

The survey is the single most important piece of due diligence in a boat purchase, and the one most buyers understand least. It is not a formality, it is not the seller's job to arrange, and it is not something to skip because the boat looks clean at the dock.

Who orders it and who pays

The buyer orders the survey and the buyer pays for it. That is not a courtesy, it is the point. A surveyor works for whoever hires them, and a report commissioned by the seller is a report written for the seller. If a seller offers you a recent survey they paid for, read it, but order your own anyway.

Choose the surveyor yourself. If the seller recommends someone, that is a reason to look elsewhere, not a shortcut. Look for accreditation through SAMS or NAMS, ask how many vessels of your type they survey a year, and ask for a sample report before you book.

What it costs

Pricing is usually by length. Expect roughly 20 to 30 dollars per foot for a pre-purchase survey, so a 35-foot vessel typically runs 700 to 1,000 dollars, and larger yachts scale from there. Rates vary by region and by how specialized the vessel is.

The haul-out is separate and is usually the buyer's cost as well, commonly a few hundred dollars depending on the yard and the size of the boat. Engine surveys, oil analysis, and sea trial time may be billed separately or by a different specialist. Budget for the total, not just the survey line item.

On a boat in the six figures, this is a rounding error against the purchase price and the cheapest insurance you will ever buy. Buyers who skip it to save a thousand dollars are the ones who discover a soft transom or a blistered hull after the money is gone.

What the surveyor actually inspects

A proper pre-purchase survey is a systematic condition assessment, not a walkthrough. The hull is examined out of the water, sounded for delamination and moisture, and checked for blistering, prior repairs, and keel or strut issues. Through-hulls, seacocks, shafts, rudders, and running gear all get inspected.

Structural elements come next: stringers, bulkheads, the transom, and the deck, with moisture readings taken where core saturation is likely. Electrical systems are checked for corrosion, improper wiring, and overloaded circuits. Plumbing, fuel systems, steering, and safety equipment are all covered.

Engines are a separate discipline. Many general surveyors will note obvious problems but recommend a dedicated engine survey with compression testing and oil analysis, particularly on diesels. On a boat where the engines represent a large share of the value, order both.

Sea trial and haul-out

A survey without a haul-out is not a pre-purchase survey. Everything below the waterline is invisible in the slip, and that is where the expensive problems live. A survey without a sea trial misses how the vessel actually performs under load, whether it tracks, and how the engines behave at temperature.

Schedule both. Expect the whole process to take most of a day for a mid-size vessel, and expect the written report a few days after.

Pre-purchase versus insurance survey

They are not the same document. A pre-purchase survey is a full condition and valuation assessment written for a buyer deciding whether to proceed. An insurance survey is narrower, focused on whether the vessel is an acceptable risk and whether required safety equipment is present.

A pre-purchase survey will usually satisfy an insurer. An insurance survey will not tell you what you need to know before buying. If your lender or insurer asks for a survey, order the pre-purchase version and it covers both needs.

How to read the report

Findings are typically sorted by urgency. Items flagged as safety-related or required for compliance need addressing before the vessel is used. Recommendations are things that should be corrected in the near term. Observations are noted conditions that are not currently problems.

Almost every used boat produces a list. A long list is not automatically a bad boat, and a short list on an old vessel is a reason to wonder how thorough the surveyor was. What matters is the severity and the cost of the items flagged, not the count.

The report will also state a fair market value and often a replacement value. Lenders and insurers care about these numbers. So should you, because a survey that values the boat well below your agreed price is leverage in a renegotiation.

The survey has to be written into the deal first

None of this protects you unless the purchase agreement says what happens when the survey finds something. Before your deposit moves, the agreement should state the contingency window, who pays for haul-out and sea trial, and whether you may withdraw, request a price adjustment, or require repairs based on the findings.

Written in advance, a bad survey is a negotiation. Not written in advance, it is a fight over a deposit. See how deposits and escrow protect both sides and the documents a private sale requires. If you are selling rather than buying, the full private sale process covers what to expect when the buyer's surveyor arrives.