What Questions to Ask When Buying a Used Boat
Twenty questions for buying a used boat from a private seller or a broker, covering engine hours, salt or fresh water use, storage and winterizing, structural soft spots, the trailer, the sea trial, and what it costs to keep the boat each year.
The questions
Open any question for the note
Why are you selling it?
Why ask it
Ask first and then stop talking. Boats get sold for ordinary reasons, a move, a bigger boat, children, a knee, but they also get sold the season a costly repair comes due. A rambling or rehearsed answer is worth noting. So is the phrase barely used, which is offered as reassurance but describes a boat that has been sitting, and sitting does its own damage.
How many hours are on the engine, and how do you know?
Why ask it
Hours matter more than years, and the meter is not always trustworthy: engines get swapped, gauges fail, and hour meters can be reset. Cross-check the figure against service invoices and the general wear on the controls and upholstery. Low hours on an older boat is a mixed signal, since engines suffer from sitting as well as from use.
Has it been used in salt water or fresh, and was it flushed after each trip?
Why ask it
Salt water shortens the life of nearly everything mechanical and electrical, and the damage is often hidden until you look at fasteners, clamps, and wiring terminals. Ask specifically about flushing, and then look for corrosion around the engine mounts, in the bilge, and on the trailer frame to see whether the answer holds up.
Where has it been kept: in the water, on a lift, on a trailer, or under cover?
Why ask it
A boat kept in the water year-round accumulates blistering, growth, and wet bilges. A trailered boat under cover usually presents the best. Storage also tells you about the owner: someone who paid for indoor storage generally paid for maintenance too. Ask what it cost them, since that number becomes yours.
Was it winterized every year, and by whom?
Why ask it
In any climate that freezes, a missed winterization can crack a block or a manifold, and the damage may not appear until the boat is under load. Ask for the invoices rather than the assurance. An owner who did it themselves may well have done it properly, but you want to hear the actual steps described.
When were the impeller and water pump last replaced?
Why ask it
The impeller is a cheap rubber part whose failure overheats an expensive engine, and it degrades with age even when the boat sits unused. A seller who knows the date has been maintaining the boat on a schedule. A seller who has never heard of it is telling you what other routine items have also been skipped.
On a sterndrive, when were the bellows and gimbal bearing last done, and on an inboard, when were the manifolds and risers last inspected?
Why ask it
These are the expensive, invisible items specific to each drive type, and both are on service intervals rather than failure schedules. Perished bellows sink boats. Rusted-through risers let water into cylinders. Ask for the last service date and, if there is not one, price the work before you make an offer, because it will be your first bill.
Can I see the service records and receipts?
Why ask it
Paperwork separates a maintained boat from a described one. Look for annual servicing, the drive and gear oil changes, and any large job such as a rebuild or a repower. Multi-year gaps matter more on a boat than on a car, because a season of sitting causes its own damage to fuel, seals, and batteries.
Has it ever taken on water, been submerged, or been in a collision?
Why ask it
Ask directly, and ask whether an insurance claim was ever filed. A submerged engine is rarely the same afterward whatever was done to it. Repaired impact damage is common and often fine; what you want is to know where it is, so a surveyor can look there specifically rather than discovering it for you later.
Are there any soft spots in the transom, the floor, or the stringers?
Why ask it
This is the question that decides whether a cheap boat is cheap. Water in the core of a fiberglass structure rots it from inside, and the repair can cost more than the boat. Push firmly on the floor with your heel, look for flexing at the transom when the engine is tilted, and treat any evasion here as an answer.
Has the hull had blister repair or bottom work, and when was it last painted?
Why ask it
Bottom work is normal maintenance on a boat kept in the water, and knowing when it was last done tells you when you will be paying for it. Ask whether the hull has ever been stripped or barrier-coated. A fresh coat of bottom paint applied just before a sale is worth asking about, since it can also cover recent repairs.
How old is the fuel tank, and when were the fuel lines last replaced?
Why ask it
Tanks and lines age quietly and the failures are serious: a leaking metal tank under a floor is a major job, and old lines can degrade internally and block filters. Ask when the filters were last changed and whether the tank has ever been drained. Any smell of fuel in the bilge deserves attention before anything else.
How old is the canvas and upholstery, and what shape is it in?
Why ask it
People treat these as cosmetic and they are not: a full canvas set or a re-upholstered interior can cost a significant fraction of the boat's value. Check the stitching, the zips, and the underside of cushions for mildew. Sun-damaged canvas that tears when you tug at a seam has to be replaced, not repaired.
Which electronics work right now, and which do not?
Why ask it
Ask the negative version, because that is the one that gets an honest answer. Then switch everything on yourself: sounder, chartplotter, radio, lights, bilge pump, blower, horn, trim gauges, and the stereo. Marine electronics fail from damp and vibration, and a screen that will not boot on the dock will not boot on the water.
Is the trailer included, and when were the bearings, tires, and brakes last serviced?
Why ask it
The trailer is easy to overlook and it is the part most likely to strand you on the way home. Check the tire date codes rather than the tread, since trailer tires age out before they wear out. Ask about bearing service, look at the frame for rust where the water reaches, and confirm the lights work.
Is there a lien on it, and do you have the title and registration in your name?
Why ask it
Boats are financed like cars and the paperwork is less standardized. Check that the hull identification number on the transom matches every document, and that the seller's name matches the title. A lender still holding the title, or a trailer titled to someone else, is the kind of thing that halts a private sale on the day money is meant to change hands.
Can I take it out for long enough to reach cruising speed and full operating temperature?
Why ask it
A sea trial is not optional. You want a cold start, time at cruise, a hard acceleration, and time at idle, plus a look at the temperature gauge throughout. Most serious problems, overheating, vibration, a slipping drive, steering play, only appear under load. A seller who will not put the boat in the water is answering the question for you.
Can I have a marine surveyor inspect it out of the water?
Why ask it
On any boat worth real money, a survey with the hull hauled is the cheapest insurance available, and insurers often require one anyway. A surveyor will moisture-test the hull, check the structure, and price the deficiencies, which gives you a negotiating document. Refusal to allow a haul-out is a reason to walk away rather than an inconvenience.
What has this boat cost you a year to keep?
Why ask it
Ask for the actual numbers: slip or storage, insurance, annual service, bottom paint, launch and haul fees, registration, and fuel at the rate this hull really burns. Owning a boat costs a real percentage of its value every year, and a seller who has kept the boat well can usually tell you what that came to.
What would you fix first if you were keeping it?
Why ask it
A good closing question because it invites honesty without accusation, and most owners answer it. What comes back is usually the item they have been putting off: a stiff trim tab, a weeping seal, a battery that will not hold, the canvas. Whatever they name becomes the first line of your own budget.
Buying a used boat without inheriting a project
Practical guidance for the conversation itself
Before you drive out to see it
- Look up what this model is known for. Most production boats have one or two documented weaknesses, and knowing them tells you where to look and what to ask.
- Ask for the hull identification number and the engine serial number by message, and check them against the listing photos.
- Ask for photos of the bilge, the transom from below, and the engine from both sides. What is refused tells you something before you spend the day travelling.
- Find out where you will keep it and what that costs, before you agree a price. Slips and dry storage have waiting lists in many places.
- Get an insurance quote for the specific boat and your own experience level. Some insurers decline older hulls or require a survey.
- Line up a surveyor and find out their availability and whether they can attend a haul-out.
Your own walk-through, in order
- 1Open the bilge first and look and smell: standing water, fuel, oil, or a fresh coat of paint over the whole area.
- 2Press the floor with your heel across the whole cockpit and listen for the difference between solid and spongy.
- 3Grab the outdrive or outboard and pull sideways and up. Play here means bearing or bracket wear.
- 4Look at the transom around the engine mounts for cracking, staining, or filler.
- 5Check every through-hull, hose clamp, and fastener for corrosion. Doubled clamps on hoses below the waterline are a good sign.
- 6Lift cushions and hatches, and look into every locker for water staining and mildew.
- 7Start the engine cold, if the seller has not already warmed it, and listen to the first thirty seconds.
- 8Switch on everything electrical at once and watch the voltage gauge.
The survey and the sea trial
Order them in the right sequence
Agree a price subject to survey and sea trial, then do both. That way the surveyor's findings are a basis for adjusting the price rather than a reason to start negotiating from scratch. Put the contingency in writing, including who pays for the haul-out.
Attend both if you can
A surveyor will explain far more standing next to the hull than the report will say in writing, and you will learn how the boat is put together. On the sea trial, drive it yourself rather than watching the owner drive it.
Get a compression test or an engine survey separately
Many hull surveyors do not cover engines in depth. On any boat where a repower would be a substantial cost, a mechanic's assessment of the engine, including compression and a look at the oil, is a separate and worthwhile expense.
The costs that surprise first-time buyers
- Slip fees or dry storage, which are often the largest annual line and rise every year.
- Insurance, which may require a survey and can be refused on older hulls.
- Annual service, plus launch, haul-out, pressure wash, and bottom paint on anything kept in the water.
- Registration, and in some places a personal property tax on the boat and the trailer.
- Fuel, at the rate the hull actually burns rather than the figure in the brochure.
- The tow vehicle. A trailer package can exceed what a family car is rated to pull, and finding that out afterwards is expensive.
- The first season of catching up on whatever the previous owner deferred, which is the cost most people forget to budget for.