A marine survey is a professional inspection of a boat that evaluates its physical condition, safety compliance, and fair market value, and it’s what buyers, insurers, and lenders rely on before putting money on the line. Surveyors generally charge around $20 to $25 per foot of boat length, plus separate costs for the boatyard haul-out and any add-on testing. The report that comes out of it drives price negotiations on a purchase, decides whether an insurer will write a policy, and documents value for estates, divorces, loans, and charitable donations.
Which Type of Survey You Need
Three types cover almost every situation, and picking the right one matters because they aren’t interchangeable.
A pre-purchase survey is the most thorough. The surveyor inspects the entire vessel, documents every deficiency, and estimates fair market value. Buyers routinely use the findings to request a price reduction or require specific repairs before closing. Skipping this to save a few hundred dollars is one of the more expensive mistakes in recreational boating, because hidden problems like core rot or corroded wiring can cost thousands to fix once the title is in your name.
A condition and valuation survey is what insurers order to decide whether a boat meets their underwriting standards and what to insure it for. Carriers want compliance with safety standards from groups like the American Boat and Yacht Council and the National Fire Protection Association.1The American Boat & Yacht Council. Standards Development A boat that falls short can be denied coverage outright, or the insurer may require specific upgrades before issuing a policy.
An appraisal survey focuses narrowly on fair market value for legal or financial purposes: estate settlements, divorce proceedings, marine loan applications, and charitable donations. The IRS requires a qualified appraisal for any noncash charitable contribution valued above $5,000, which covers most boat donations,2Internal Revenue Service. Instructions for Form 8283 and IRS Publication 561 specifically recommends that boat valuations rely on a marine surveyor’s assessment because physical condition is so central to a vessel’s worth.3Internal Revenue Service. Publication 561 – Determining the Value of Donated Property
What a Survey Costs
Most surveyors charge by the foot, generally around $20 to $25 per foot, often with a minimum fee that applies to small boats. A 20-foot runabout may cost the same as a 25-footer because of that floor. Complex vessels with multiple engines, generators, or extensive systems push rates higher.
The surveyor’s fee is only part of the bill. The haul-out is paid separately to the boatyard and includes the travel lift and a pressure wash, sometimes with an environmental fee layered on. On a 35-foot boat, haul-out costs alone can add a few hundred dollars. If the surveyor recommends supplemental oil analysis on a diesel, expect roughly $25 to $50 per sample depending on the lab. Budget for all of it before scheduling, so the final number doesn’t come as a surprise.
What the Surveyor Inspects
Hull and Deck
The hull is where the most expensive problems hide. Surveyors use moisture meters to find water trapped inside fiberglass laminates and percussion hammers to detect voids and delamination. Some also use infrared thermography to spot temperature differences on the hull surface that signal moisture intrusion, which can reveal problems moisture meters miss. Major structural repairs on a mid-sized boat can run well into five figures, so this part of the inspection carries real financial weight.
Engine and Drive Systems
The engine, transmission, and drive get a thorough look: engine mounts, cooling hoses, exhaust risers, shaft alignment, corrosion, fluid leaks, and signs of overheating. On diesels, surveyors sometimes recommend oil analysis, which tests for internal wear metals, salt contamination, and fuel or coolant in the oil. That testing can catch engine problems that aren’t visible from outside the block.
Fuel and Electrical
Fuel system hoses must meet specific federal fire safety standards, with different fire resistance and permeation ratings required depending on where the hose sits in the system.4eCFR. 33 CFR Part 183 Subpart J – Fuel Systems Non-compliant hoses are a fire risk and a common survey deficiency. On the electrical side, surveyors evaluate both AC and DC systems for improper wiring, corroded connections, and missing circuit protection. Electrical faults are second only to fuel issues as a source of onboard fires.
Safety Equipment
Federal regulations require recreational boats to carry specific safety gear, and the surveyor confirms every item is present, accessible, and serviceable.5eCFR. 33 CFR Part 175 – Equipment Requirements Fire extinguishers must be an approved type and not expired. Visual distress signals have a marked service life and can’t be used past it. Life jackets have no expiration date but must be free of rips, tears, and deteriorated or waterlogged flotation. A boat missing required gear won’t satisfy an insurer or a lender.
How the Inspection Unfolds
The process has three parts, and all three usually happen in a single day if the boatyard is ready.
It starts dockside, with the boat still in the water. The surveyor works through the interior, tests electronics, checks plumbing, and runs every system that operates while stationary.
Next is the haul-out. A travel lift pulls the boat from the water at a boatyard, and the yard typically pressure-washes the bottom before the surveyor begins. With the hull exposed, osmotic blistering, waterline damage, deteriorated anodes, and problems with the rudder, propeller, shaft, and through-hull fittings become visible. This phase is often the most revealing of the entire survey.
The sea trial follows, back in the water. The surveyor runs the engine at various RPM settings and records temperatures, fuel consumption, and vessel speed against the manufacturer’s specifications. Steering response, transmission shifting, and tracking at speed get evaluated here. A big gap between observed and expected wide-open-throttle RPM can point to propeller trouble, bottom fouling, or an engine issue that wouldn’t show up at the dock.
Finding a Qualified Surveyor
Many insurers and lenders require credentials from either the Society of Accredited Marine Surveyors (SAMS) or the National Association of Marine Surveyors (NAMS).6The American Boat & Yacht Council. Surveying a Boat Both groups hold members to a code of ethics and require continuing education.7Society of Accredited Marine Surveyors. Society of Accredited Marine Surveyors – Home Both maintain searchable directories on their websites, which is the simplest starting point.
Hire locally when you can. A surveyor who works your region will know the boatyards, understand what area carriers expect, and have experience with the vessels common in those waters. Whoever you choose should have no financial tie to the seller, broker, or boatyard doing the haul-out. Independence is the whole point.
Preparing the Boat
A prepared boat gets a faster, more accurate inspection. A cluttered one eats hours and generates findings that reflect disorganization rather than real defects.
Have the paperwork ready: the Hull Identification Number, which every manufacturer must affix to the hull under federal rules,8eCFR. 33 CFR 181.23 – Hull Identification Numbers Required current registration, and maintenance logs covering engine service, bottom paint, and past structural work. An engine with a full log of oil changes and impeller replacements raises different questions than one with no records at all.
Physically, clear personal gear from lockers and compartments so the surveyor can see the inside of the hull, reach the bilge, and access through-hulls and seacocks. Fully charge the batteries and connect shore power so electrical systems can be tested. Hand over all keys and security codes before the inspection starts. Locked hatches and dead batteries only extend the day and add to the fee.
How Long the Report Stays Valid
A survey is a snapshot of the boat on the day it was inspected, not a warranty. Most insurers accept surveys within the last two to three years, though requirements vary by carrier and tend to tighten with older boats and higher values. If you’re financing, the lender will almost certainly want a current survey, and “current” for loan underwriting usually means within the past 90 days. Ask your carrier and lender for their specific windows before scheduling, so you don’t pay for a survey that expires before the deal closes.
Reading the Final Report
The surveyor delivers a written report within a few business days. It lists every finding and recommendation, usually sorted by priority. Items flagged as safety deficiencies or required repairs matter most because they drive insurability and seaworthiness. Recommended improvements and maintenance notes are lower priority but worth reading for what they signal about costs down the road.
For buyers, the report is a negotiation tool. Sellers expect some issues to surface; the question is whether what’s listed justifies a price adjustment or specific repair demands as a condition of closing. For insurance applications, the carrier may require certain deficiencies to be addressed within a fixed timeframe before binding coverage. In either case, the value number at the bottom is far less important than the detailed findings above it.
If the Surveyor Misses Something
A survey isn’t a guarantee that every defect has been found. Surveyors are expected to exercise reasonable care and deliver a competent inspection, but no inspection catches everything. Many surveyors include contract clauses that limit or disclaim liability for missed defects, and whether those clauses hold up varies by jurisdiction. Some courts have struck down broad disclaimers on public policy grounds; others have enforced them.
If you believe a surveyor missed something ordinary competence should have caught, maritime tort claims generally must be filed within three years of the date the cause of action accrued. For hidden defects, that clock may start when you discover the problem rather than when the survey was performed. Read the surveyor’s contract before hiring, keep the report and all correspondence, and recognize that a credentialed surveyor carrying professional liability insurance gives you more recourse than an uninsured one if something goes seriously wrong.