Boat Surveys: What to Actually Look For When Buying

Boat hauled out for inspection

A boat survey is the most expensive due-diligence check most people ever pay for, and the one that pays back most reliably. A $1,500-$2,500 survey on a $200,000 boat can either confirm you're getting what you think you're getting, or save you from a $40,000-$100,000 mistake. The difference between a good survey and a bad one is whether the surveyor knows what to look for on the specific kind of boat you're considering.

This is what a good marine survey actually covers, what to look for in a surveyor, and what to verify yourself before signing.

What a survey is (and isn't)

A marine survey is a one-day inspection by a certified marine surveyor that documents the vessel's condition. The survey produces a written report typically 30-80 pages covering structural, mechanical, electrical, and safety conditions.

A survey is NOT:

A warranty or guarantee
An appraisal (though many include a fair market value estimate)
A sea trial (those are separate, often conducted simultaneously)
A guarantee that no problems exist (surveyors find what's visible in a one-day inspection)

What a survey IS:

A thorough independent assessment by a trained professional
A document insurance companies and lenders rely on
A negotiation tool — major findings often translate to price reductions
A multi-year maintenance roadmap

Types of surveys

Pre-purchase survey ($1,500-$4,000 for typical cruising boats): comprehensive condition assessment before purchase. The most common type. Usually includes haul-out, sea trial, full hull inspection, mechanical, electrical, plumbing.

Insurance survey ($500-$1,500): focused on insurability — meets insurance company requirements, identifies safety issues, documents value. Less comprehensive than pre-purchase.

Damage/condition survey ($800-$2,500): post-incident or post-storm assessment of damage and repair recommendations.

Appraisal-only survey ($500-$1,000): fair market value documentation without condition assessment.

For buying, get the pre-purchase survey — it's the comprehensive version.

Finding a good surveyor

The two main certifications:

SAMS (Society of Accredited Marine Surveyors) — Accredited Marine Surveyor (AMS) is the senior credential
NAMS (National Association of Marine Surveyors) — Certified Marine Surveyor (CMS) is the senior credential

Both are legitimate. Look for AMS or CMS credentials specifically (not just members — both organizations have multiple membership levels).

Beyond certification:

Specialization matches your boat. Sailboat surveyors vs. powerboat surveyors vs. mega-yacht surveyors vs. wooden boat surveyors all have different expertise.
Local familiarity. A surveyor who's surveyed the make/model multiple times knows where to look for common issues.
References from buyers, not sellers. A surveyor recommended by a broker may favor the deal closing. Ask buyers who've used them.
Willing to provide sample reports. Good surveyors are happy to show you what their reports look like.
No financial interest in the transaction. Surveyor shouldn't be related to the broker, marina, or seller.

Budget $1,500-$3,000 for the survey itself plus $500-$1,500 for the haul-out, depending on boat size and location. The buyer pays — never accept the seller paying for the survey (the surveyor's loyalty is to whoever pays).

What a good survey covers

A comprehensive pre-purchase survey covers all of these:

Hull

Gelcoat condition and color match
Blistering, cracking, crazing
Stress cracks (often around hardware mounts)
Bottom paint condition and history
Hull-to-deck joint integrity
Through-hull fittings and seacocks (operation, condition)
Keel attachment (encapsulated vs. bolted, evidence of grounding)
Rudder condition, bearings, post seal
Strut and bearing condition
Propeller damage and pitch
Cutless bearing wear

Deck and superstructure

Soft spots indicating core saturation
Hardware bedding and backing plates
Stanchion bases and lifeline anchorage
Cleats, chocks, and deck fittings
Toe rail and rub rail condition
Hatches, ports, and dodger frames
Mast step (corrosion, water damage)
Standing rigging (cracks at swages, wire condition)

Engine and mechanical

Engine hours and service records
Oil analysis (recommended — small extra fee)
Coolant condition
Belt and hose condition
Mounts and alignment
Transmission and drive
Fuel system (tanks, filters, hoses)
Starting and charging system
Exhaust system

Electrical

AC and DC distribution panels
Wire condition (especially in engine room)
Shore power inlet and cord
Battery banks and chargers
Ground fault protection
Lightning protection (if fitted)
Inverter and battery monitor condition

Plumbing

Freshwater system (tank, pump, water heater)
Head(s) and holding tank
Pump-out system
Bilge pumps (manual and electric, float switches)
Through-hull seacocks and hose clamps

Sailing systems (sailboats)

Standing rigging detailed inspection (often a separate rigger inspection)
Running rigging condition
Sail condition (separate sailmaker inspection ideal)
Winches (function, brakes, mounting)
Mast and boom condition
Spreaders and rigging hardware

Safety equipment

Fire extinguishers (date, condition)
Life jackets (count, condition, sizing)
Flares (date)
VHF radio (function)
EPIRB (if fitted, registration and battery)
First aid supplies

Documents reviewed

Title and registration
USCG documentation (if applicable)
Insurance history
Service records
Previous survey reports (if seller has them)

What you should verify yourself

Even before the survey, things you can spot:

Walk the boat in daylight. Look for:

Stress cracks radiating from hardware
Soft spots underfoot (especially around deck hardware)
Standing water in the bilge that shouldn't be there
Salt deposits indicating leaks
Engine oil/coolant leak signs
Burned smell or evidence of electrical fires

Talk to dockmates. Other boat owners in the marina often know more about a specific boat than the seller will share. Two minutes of conversation at the slip can save thousands.

Check the engine room thoroughly:

Engine appearance (clean engines were cared for; greasy/dirty engines often weren't)
Hour meter reading
Battery age and condition
Wiring neatness

Sea trial yourself, not just the surveyor's. Run the engine through its full RPM range, check for:

Smoke (white = water in fuel; blue = oil burning; black = rich mixture)
Vibration
Steering response
Transmission engagement

Negotiate based on findings. Almost every survey finds something. Major findings (structural, engine, electrical) are negotiating points — either price reduction or seller-paid repair.

What to do with the survey report

After the survey:

Read the entire report — not just the executive summary.
Categorize findings as Safety (must fix), Material Defect (price negotiation), Maintenance (informational).
Get quotes on major repairs before responding to the seller.
Negotiate based on actual repair quotes, not estimates from the survey.
Don't expect the seller to fix everything — that's not how it usually works. Negotiate the price down to cover the work.
Be willing to walk if the findings are bad enough. The boat market always has more boats.

Common deal-breaker findings

A few survey findings that often justify walking away:

Major deck core saturation ($20-$50K+ to repair properly)
Hull blistering throughout ($20-$80K depending on hull size)
Engine showing signs of major rebuild needed (replace engine: $20-$100K+)
Major structural cracks in stringers, bulkheads, or hull
Standing rigging beyond service life with no recent replacement (one-off cost, but watch out for the inspector signing off on rigging that should be replaced)
Evidence of major saltwater intrusion in electrical, fuel, or engine systems
Holding tank or sanitation system rotted out (full replacement)

A surveyor's report that flags one of these is doing you a favor — the seller can either negotiate substantially or you can walk and find a better boat.

Cost of NOT surveying

Buyers who skip the survey to save the fee typically:

Discover hidden problems within months ($5K-$50K in surprise repairs)
Can't get insurance (insurers require surveys for older boats)
Can't finance (lenders require surveys for loans)
Have less leverage in any negotiation
Buy boats that turn into money pits

The survey isn't optional for any boat over $25K-$30K.

For shops to handle survey-revealed issues

Most survey findings translate to specific service needs:

Hull and gelcoat issues → hull repair shops
Engine issues → marine engine shops
Electrical issues → marine electrical shops
Rigging issues → rigging shops
Plumbing issues → plumbing & sanitation shops

Browse our services directory for shops in any category.

Bottom line

A pre-purchase survey is the cheapest insurance you can buy when purchasing a boat. Spend the money, work with a credentialed independent surveyor who specializes in your kind of boat, read the entire report, and negotiate based on findings. The survey isn't a guarantee but it dramatically reduces the chance of nasty surprises.

For broader buying considerations, see our boat insurance guide and the services directory for shops to handle any findings.

Photos by Unsplash contributors.