What Is a Pre-Purchase Marine Survey,
& What Does It Include?

Buying a boat is a major investment, and a pre-purchase marine survey is one of the most important steps a buyer can take to protect that investment before completing the purchase. A pre-purchase survey provides an objective evaluation of the vessel’s condition, systems, equipment, and overall value so the buyer can make a more informed decision.

At Steel Rose Marine Services, a pre-purchase survey is designed to give prospective buyers a thorough understanding of the vessel before they commit to ownership. The survey typically includes an inspection of the vessel both in and out of the water, along with an in-water trial run when requested and appropriate.

What does a pre-purchase marine survey include?

A pre-purchase survey is the most comprehensive type of marine survey. Depending on the vessel and its systems, the inspection may include:

• Hull, deck, superstructure, and structural components
• Through-hulls, seacocks, and underwater fittings
• Propulsion and steering systems
• Fuel systems
• AC and DC electrical systems
• Batteries, chargers, and shore power systems
• Bilge pumps and drainage systems
• Navigation and communication equipment
• Plumbing and potable water systems
• Heads and sanitation systems
• Heating and air-conditioning systems
• Safety equipment
• Anchoring and deck equipment
• Sailboat spars, standing rigging, and deck-level rigging components
• Interior condition and installed equipment

The exact scope will vary based on the vessel’s design, size, age, equipment, systems, and accessibility.

Is a haul-out necessary?

A haul-out is strongly recommended as part of a pre-purchase survey because important portions of the vessel cannot be properly inspected while the boat is in the water.

When hauled, the surveyor can inspect areas such as the hull bottom, keel, rudder, propellers, shafts, struts, underwater fittings, and other components below the waterline that are critical to the vessel’s safety and overall operation.

What happens during the in-water trial run?

The trial run provides an opportunity to evaluate the vessel’s systems, performance, and operation while underway, typically near her home port in calm to moderate conditions.

Depending on the vessel, this may include checking:

• Engine operation at varying RPM
• Transmission shifting and response
• Steering response while maneuvering
• Back-down testing to assess engine-mount and drivetrain movement
• Engine instruments and gauge functionality
• Cooling-system performance and signs of overheating
• Navigation-electronics functionality
• Autopilot functionality and ability to hold course
• Trim-system operation and response
• Bow or stern thruster operation and response
• General vessel handling while underway and during docking and undocking

What does the buyer receive after the survey?

Following the inspection, the client receives a detailed professional report documenting the vessel’s condition and significant findings.

The report typically includes:

• Vessel specifications and identification information
• Condition statements for major systems and equipment
• Findings related to standards compliance, deficiencies, maintenance, safety, and general marine practice
• An overall condition statement
• An opinion of fair market value and replacement cost
• Surveyor’s certification
• Photographs

The goal is to provide information that is practical, thorough, understandable, and useful when making a purchase decision. The survey report also provides a dated record of the vessel’s condition at the time of the inspection and may remain useful throughout future ownership.

Can a marine survey help with purchase negotiations?

A marine survey is not performed for the purpose of negotiating the purchase price, but its findings can give a buyer useful information when deciding how to proceed.

Significant deficiencies, deferred maintenance, or unexpected repair needs may influence whether a buyer chooses to continue with the purchase, request repairs, renegotiate the price, or walk away from the transaction altogether.

My role as your surveyor is not to tell you whether to purchase the vessel or how to negotiate the transaction. It is to provide a thorough and objective overview of the vessel so you can decide how to proceed with confidence. The final decision remains between the buyer and seller.

How long does a pre-purchase survey take?

The amount of time required depends heavily on the vessel’s size, type, configuration, systems, condition, accessibility, and overall complexity.

A smaller, simpler boat may take only a few hours to inspect, while a larger cruising vessel with multiple systems, engines, cabins, and equipment may require a full workday or longer.

Haul-out scheduling, trial-run time, vessel accessibility, and overall condition can also affect the length of the survey.

Do I need to be there for the pre-purchase survey?

The prospective buyer is not required to attend the survey, but when possible, attendance is strongly encouraged.

I will provide a detailed written report and am happy to discuss the survey and its findings at length, but nothing fully replaces seeing the vessel and any notable deficiencies firsthand.

The survey is also an excellent opportunity to become familiar with some of the vessel’s less visible components and systems that may not normally be accessed during a typical showing with a broker.

How do you inspect the engine(s)?

During a pre-purchase survey, the engines are first visually inspected for signs of leakage, corrosion, wear, damage, deterioration, and other potential deficiencies.

When possible, the engines are then evaluated while operating at the dock and during the in-water trial run. This may include assessing abnormal vibration, power delivery, operating temperature, gauge readings, cooling performance, and overall operation across a range of RPM, including wide-open throttle when appropriate.

This inspection does not include disassembly or examination of internal or inaccessible engine components. However, it can identify conditions that may warrant further evaluation by a qualified marine mechanic or engine technician.

What about sailboats and rigging?

A typical pre-purchase survey of a sailboat includes a deck-level inspection of the mast, standing rigging, running rigging, chainplates, terminals, and accessible associated equipment.

For buyers who want a more detailed inspection, a separate rigging survey can be added. This may include climbing the mast to inspect the entire rig and associated equipment for corrosion, cracking, damage, point loading, and other deficiencies that may not be visible from deck level.

A rigging survey can identify potential deficiencies and failure points. Depending on the findings, additional evaluation by a professional rigger may be recommended, including specialized testing, rig-tension assessment, dye-penetrant testing, or further evaluation for repair or replacement.

How much does a pre-purchase marine survey cost?

Survey pricing varies based on vessel length, complexity, systems, location, haul-out requirements, and the overall scope of work. Pricing is typically calculated on a per-foot basis, with adjustments made for the vessel’s layout, systems, configuration, and complexity.

For example, a 40-foot sailing catamaran would generally require more time to survey than a similarly equipped 40-foot monohull because of its additional hull, systems, and overall layout. Likewise, a multi-deck 40-foot motor yacht with extensive onboard systems may require considerably more time than a simpler vessel of the same length.

Steel Rose Marine Services publishes general pricing information on the website to help clients understand typical costs before requesting a formal quote. View survey pricing details.

Do I really need a survey before buying a boat?

For most used-boat purchases, a professional pre-purchase survey is highly recommended.

Boats contain many interconnected structural, mechanical, electrical, plumbing, and safety systems. Problems are not always obvious during a casual inspection, particularly to someone unfamiliar with the vessel.

A thorough marine survey can help identify significant concerns before the transaction is completed and provide a clearer understanding of the vessel’s condition and what future ownership may involve.

A recent pre-purchase survey may also satisfy the requirements of some insurance providers and can be useful when seeking vessel financing. Insurance requirements vary by carrier, vessel age, value, and other factors, but many marinas require liability coverage and many insurers require a current survey for certain vessels.