Used Boat Inspection Checklist: What to Check Before You Buy

Why a checklist beats a casual walkaround

Sellers show the bright work first. Soft decks, frozen seacocks and wiring that fails Coast Guard rules hide under cushions and bilge boards. BoatUS's February 2026 survey guide puts the order plainly: a prepurchase survey usually needs time in the water, a short haul and a trial run, and the surveyor works for you, not the broker. Even if you skip a paid survey on a small skiff, walk the same ground yourself so you know what you are signing.

Photograph the hull identification number, capacity plate, engine serials and any damage the seller calls cosmetic. Compare those shots to the title later. If they do not match, stop.

Papers first: title, HIN, capacity plate and recalls

Ask for the title or state registration, a bill of sale draft and any service records before you schedule a haul. Match the hull identification number on the paperwork to the number on the boat. Under 33 CFR Part 181, a US HIN is twelve characters with no slashes, hyphens or spaces. The first three characters are the manufacturer identification code. Characters nine and ten encode month and year of manufacture or certification, and eleven and twelve are the model year. The primary HIN sits on the starboard outboard side of the transom near the top on boats that have a transom.

Monohull boats under 20 feet (except sailboats, canoes, kayaks and inflatables) must carry a Coast Guard capacity plate under 33 CFR Part 183. The plate shows maximum persons, maximum weight and, on outboards, maximum horsepower. A missing, altered or unreadable plate is a red flag on a trailerable runabout.

Then search the Coast Guard recall list. As of 5 Nov 2026 the public database at uscgboating.org/content/recalls.php held about 1,700 records and lets you search by manufacturer identification code, company, model or model year. Use the first three characters of the HIN as the MIC. An open campaign is not automatic grounds to walk, but you want a written plan from the seller or dealer before money moves.

Hull and structure

Start on the hard if you can. Look for gelcoat cracks that radiate from cleats, stanchions and the hull-to-deck joint, and for soft spots when you walk the foredeck and cockpit sole. BoatUS flags water intrusion, bulkhead or stringer rot, hull-to-deck separation and fiberglass delamination as the early deal breakers a surveyor checks first, because those repairs can erase the bargain.

From outside, check the transom for flex around the outboard bracket or sterndrive, oil or water stains below the swim platform, and blisters below the waterline after a haul. On wood-cored boats, dark stains around hardware often mean wet core. Tap lightly with a plastic mallet if you know what solid laminate sounds like; if you do not, leave sounding to a surveyor. Inside, open every bilge hatch you can reach and look at stringer tops, tabbing and bulkhead landings for softness or fresh resin covering an old repair.

Engine and drive

Record hour meter readings and ask whether the meter was ever replaced. Cold-start the engine after it has sat, which is what BoatUS recommends for survey day, and watch the exhaust for heavy smoke at idle. Look under the cowling or in the engine space for salt crust, oil in the bilge, weeping gaskets and chafe on fuel or raw-water hoses. On sterndrives, check the bellows, shift cable boot and anode condition. On outboards, check tilt/trim, tell-tale flow and prop damage.

A short trial run is not a heavy-weather sea trial. BoatUS describes it as a run away from the dock so the surveyor can watch temperatures, RPMs, leaks and strain under load. Have someone competent at the helm. You can take the wheel briefly once clear of the dock, but liability still sits with the seller until closing. If the engines are a large share of the boat's value, BoatUS advises a separate mechanic survey on those engines; their February 2026 piece put that work at about $500 per engine at the time of writing. I am not quoting general surveyor day rates here because they vary by market and boat.

Systems: electrical, fuel, bilge and safety gear

Gasoline inboard and sterndrive boats fall under the electrical and fuel system rules in 33 CFR Part 183. You do not need to recite the tables on the dock, but you can spot common failures: batteries that slide around, missing overcurrent protection near the battery, fuel hoses without USCG type markings, soft or cracked fill hoses, and bilge blowers that do not move air. ABYC writes the voluntary standards many surveyors use as a yardstick for design and repair; the Coast Guard even incorporates selected ABYC material by reference in Part 183. You will not find published ABYC "survey fees" because ABYC is a standards body, not a survey network.

Run bilge pumps on both auto and manual. Confirm float switches work. Check seacocks for smooth travel and hoses that are double-clamped below the waterline. Power up navigation lights, the horn, and any CO alarms. Confirm fire extinguishers and visual distress signals are present and not past their service dates. BoatUS notes that surveyors catalogue safety gear and flag missing or expired Coast Guard required equipment in the report.

Trailer, if it is part of the deal

A trailer can cost as much to fix as a midlife outboard. Match the tongue VIN to the title, then check tire date codes, bearing play, bunks or rollers, winch strap, lights and brakes. Bent axles and deep frame rust matter. Title the trailer with the same care as the boat.

When to hire a surveyor

Hire an independent surveyor when the boat is large enough that a hidden structural or systems failure would hurt, when a lender or insurer will demand a condition and value survey, or when you simply want a written record before you buy. BoatUS points buyers to the two main US associations: the Society of Accredited Marine Surveyors (SAMS) and the National Association of Marine Surveyors (NAMSGlobal). Check that your candidate is listed, ask for a sample report, and confirm your insurer accepts that affiliation. Do not use the seller's surveyor.

SAMS Accredited Marine Surveyors keep continuing education under a code of ethics. NAMSGlobal certifies members across yachts and small craft and other marine work. Either path beats a handshake inspection at the ramp. Attend the survey, ask questions, and keep the report. BoatUS says a typical prepurchase report can run around 30 pages and often takes a few days to arrive, so build that lag into your purchase agreement.

Walk real listings with this list in hand

Print the checklist, then compare asking prices and condition notes on live inventory. Start with common fiberglass brands such as Sea Ray, Bayliner and Boston Whaler, and browse state pages for Florida and Texas if that is where you will boat. A clean listing photo is not a survey. Make the seller earn the sale against the points above.