What a Marine Surveyor Actually Checks (and What They Do Not)
The survey is the best money you will spend and the most commonly misunderstood. It is a condition report on a structure, not a warranty on a machine.
By Boatmere Brokerage Desk · Updated · 8 min read
A survey report is the single most useful document in a boat purchase and it is routinely misread. Buyers treat it as a pass or fail. It is neither. It is a dated condition report on a structure, written by somebody with no stake in whether you buy, and its value is in the detail rather than the verdict.
It also does not cover the engines, which surprises a startling number of first-time buyers on the day.
What does a marine surveyor check?
A pre-purchase survey covers the hull, deck, systems and safety equipment, and produces an opinion of condition and fair market value. Specifically:
- Structure. Hull laminate, stringers, bulkheads, keel joint, transom. Percussion testing across the deck and hull to find delamination by sound.
- Moisture. A meter across cored areas of deck and hull, with readings recorded by location. Elevated readings around fittings are the classic finding.
- Below the waterline. Blistering, previous repairs, running gear alignment, cutless bearing wear, rudder play, prop condition, anode state.
- Through-hulls and seacocks. Material, bonding, and whether every one of them actually operates. Seized seacocks are one of the most common written recommendations.
- Electrical. Against ABYC standards — wire gauge, over-current protection, battery securing, galvanic isolation, AC shore power polarity.
- Fuel systems. Tank condition where visible, hose age and marking, fills, vents, and grounding.
- Steering and controls. Play, hydraulic condition, cable runs.
- Safety gear. Flares, extinguishers, placards, and whether they are in date.
At the end you get findings graded by urgency. Most reports separate them into items requiring immediate attention for safe operation, items to address in the near term, and recommendations.
What it does not cover
This list matters more than the one above, because it defines what you still have to buy.
Engines and transmissions. Almost universally excluded. The surveyor will note visible condition and defer to a mechanical survey.
Rigging on a sailboat, usually. Standing rigging inspection is often a separate specialist, and on any boat with rigging over ten years old it is worth commissioning.
Tankage interiors. Nobody can see inside an aluminium fuel tank foamed into a stringer bay. This is a genuine blind spot on boats of a certain age and construction.
Anything hidden. A surveyor does not dismantle. If a panel is screwed down, it generally stays screwed down, and that is standard practice rather than laziness.
Future performance. A survey is a snapshot on a date. It is not a warranty and every report says so in the first page of limitations that people skip.
SAMS, NAMS, and why accreditation matters
Marine surveying is not a licensed profession in the United States. Anybody can print a card. The two credible accrediting bodies are SAMS, the Society of Accredited Marine Surveyors, and NAMS, the National Association of Marine Surveyors. Both require testing, continuing education and adherence to an ethics code.
SAMS accredits more surveyors across recreational marine. NAMS skews toward commercial work and larger yachts. Either is fine.
What is not fine is a surveyor recommended by the selling broker with no accreditation and no report samples. Ask for the accreditation number, ask to see a redacted sample report, and hire the surveyor yourself. The relationship needs to be between you and them and nobody else in the transaction.
Costs, honestly
| Item | 2026 typical cost | Notes |
|---|---|---|
| Hull and systems survey | $22 to $30 per foot | $700 to $1,000 for a 32 ft |
| Haul-out and short haul | $12 to $20 per foot | Buyer pays, usually |
| Engine survey, outboards | $400 to $700 | ECU pull, compression |
| Engine survey, diesels | $700 to $1,200 | Oil analysis, borescope |
| Oil analysis, per engine | $35 to $60 | Worth it every time |
| Rigging inspection, sail | $400 to $900 | Over 10 years, essential |
For a 32-foot sportfish that is around $2,000 all-in. Against a $300,000 purchase it is two-thirds of one percent, and it is the only two-thirds of a percent in the transaction that is working purely for you.
Haul the boat
Non-negotiable for a purchase. Roughly half of what determines a boat's condition sits below the waterline — bottom laminate, blistering, keel joint, through-hulls, shafts, struts, cutless bearings, rudders.
An in-water survey is a legitimate product for an insurance renewal on a boat you already own. As a basis for spending three hundred thousand dollars, it is not adequate, and a seller who resists a haul-out is telling you something.
Go to the haul-out yourself. Stand there while the boat comes out and watch the surveyor work. You will learn more in ninety minutes than the report will ever convey, and you will see the surveyor's face when they tap something that sounds wrong.
How to use the report
Not as a negotiating cudgel, or at least not only that.
- 01Read the limitations page. It tells you what was not inspected and therefore what you still do not know.
- 02Separate the safety findings from the cosmetic ones. Insurers will require the first category fixed before binding, so those are real money on a deadline.
- 03Get quotes for the significant items before you renegotiate. "The survey found issues" is weak. "Here are three yard quotes averaging $14,200" is not.
- 04Keep the report forever. It is the baseline for every future survey and it will be requested when you sell.
- 05Action the recommendations and keep the invoices. A survey with closed-out recommendations is worth real money at resale.
The uncomfortable truth is that almost every used boat surveys with findings. A clean report on a fifteen-year-old boat should make you more suspicious, not less. What you are looking for is the absence of structural surprises and a list of maintenance items you can price.
We commission an independent survey on brokerage listings above $250,000 and publish the findings on the listing, including the bad ones. It costs us deals occasionally. It also means the buyer who does fly out already knows what they are looking at.
Frequently asked questions
- What does a marine surveyor check?
- Hull and deck structure, moisture content of cored laminates, through-hulls and seacocks, steering and rudder gear, electrical systems against ABYC standards, fuel systems, safety equipment, and the boat's overall condition and value. Engines are normally excluded and surveyed separately by a mechanic.
- How much does a pre-purchase boat survey cost?
- Typically $22 to $30 per foot in 2026, so $700 to $1,000 for a 32-footer, plus the haul-out at $12 to $20 per foot. A separate engine survey adds $400 to $1,200 depending on whether oil analysis and compression testing are included.
- What is the difference between SAMS and NAMS?
- Both are accrediting bodies with testing, continuing-education and ethics requirements. SAMS accredits a larger number of surveyors across recreational marine; NAMS tends toward commercial and larger yachts. Either accreditation is acceptable to insurers and lenders; an unaccredited surveyor often is not.
- Does the survey include the engines?
- Usually not. Most marine surveyors explicitly exclude engine internals and will recommend a separate mechanical survey. Treat the two as different purchases: the surveyor tells you about the structure, the mechanic tells you about the machinery.
- Should the boat be hauled for the survey?
- Yes, always for a purchase. Roughly half of a boat's condition — bottom, running gear, through-hulls, keel joint, blistering — is invisible in the water. An in-water survey is acceptable for an insurance renewal and inadequate for a purchase decision.
