Yacht Survey Checklist: What a Marine Surveyor Checks

By-owner guide · Updated June 2026 · Educational only

A marine survey is the single most important step between agreeing on a price and handing over money. This yacht survey checklist walks both sides of the deal through exactly what a surveyor inspects, so buyers know what to expect and sellers know how to prep. Whether you're buying or selling on YachtBazar's by-owner listings, going into the survey informed protects your wallet and your timeline.

A pre-purchase boat survey is a top-to-bottom condition and valuation inspection performed by an independent, accredited marine surveyor (look for SAMS or NAMS accreditation). The buyer normally pays for it — budget roughly $20–$25 per foot — and it's almost always required for financing and insurance. The result is a written report with a fair-market valuation and a list of findings sorted by urgency. That report is your leverage to renegotiate, request repairs, or walk away.

What Does a Marine Surveyor Check?

A full pre-purchase survey covers the hull, structure, systems, and safety gear. Expect the boat to be hauled out so the surveyor can inspect below the waterline. Here is the core boat survey checklist a competent surveyor works through:

• Hull and structure — moisture readings on the hull and deck, blisters, delamination, stress cracks, keel-to-hull joint, and a sounding (percussion) test for voids or rot.
• Below the waterline — running gear, prop shaft and cutless bearing, rudder play, through-hull fittings and seacocks, and the condition of bottom paint and zincs/anodes.
• Engine and mechanical — visual inspection, belts, hoses, mounts, and fluid checks. Note: most surveyors do NOT do an internal engine teardown — budget a separate engine survey or oil analysis for high-value diesels.
• Electrical and plumbing — battery banks, wiring condition, panel, shore-power and galvanic isolation, bilge pumps, and fresh/raw-water systems for leaks.
• Fuel and steering — tanks, lines, fittings, and the full steering system for play or corrosion.
• Rigging and sails (sailboats) — standing and running rigging, chainplates, mast step, and sail condition.
• Safety gear — flares, fire extinguishers, life jackets, CO detectors, navigation lights, and ground tackle.
• Sea trial — the boat run under power (and sail) to check performance, vibration, shifting, charging, and temperature under load.

How Sellers Should Prep for a Survey

A clean, well-documented boat surveys better and closes faster. Sellers, do this before the surveyor arrives:

• Clean the bilge, lockers, and engine bay so the surveyor can actually see and reach components.
• Gather maintenance records, the original purchase paperwork, and a complete equipment inventory.
• Fix obvious small items — dead bilge pump, missing fire extinguisher, frayed wiring — that would otherwise become red flags.
• Make sure all systems run: start the engine, test electronics, and confirm tanks aren't empty for the sea trial.
• Be honest about known issues. Surveyors find them anyway, and disclosure builds the trust that closes a by-owner sale.

Pricing your boat realistically before the survey avoids a painful renegotiation. Use our free boat price research tool to set a number the survey valuation will support, then list it free on sell my boat or, for larger vessels, sell my yacht.

How Buyers Should Use the Report

Read the findings in priority order. "Vessel is in average/above-average condition for her age" is the language you want; a cluster of safety or structural items is your cue to renegotiate or walk. The survey valuation also tells you whether the asking price is fair. Buying directly from the owner already saves you the broker commission — brokers typically charge around 10%, which is $5,000 on a $50,000 boat or $30,000 on a $300,000 yacht (more in our yacht broker commission guide). Put part of those savings toward a thorough survey; it's the best money you'll spend.

Closing the Deal Safely

Once the survey checks out and you've agreed on final terms, paper the sale properly. Use our free bill of sale and purchase agreement templates, and follow the safe-payment guide so the funds move securely — survey, contract, and verified payment are the three pillars of a clean by-owner transaction. Need a slip for your new boat? Browse the docks and slips marketplace. Still have questions? Owners and buyers compare notes every day in the YachtBazar community forum.

Big marketplaces like YachtWorld and Boat Trader are excellent for broker- and dealer-listed inventory, where a listing typically runs through a paid listing or a broker who charges roughly 10%. YachtBazar is the free, by-owner-first alternative — list your boat at no cost and let buyers contact you directly. A solid survey is what makes that direct deal safe for everyone.