Understanding Motorboat Insurance Cover and Policy Conditions

Last reviewed by Stephen Corbett UK Boat Lead October 2026

Understand the main motorboat insurance terms for engine damage, outboard security, trailers, navigation limits, surveys, agreed value and exclusions.

Motorboat insurance can differ a lot in how it treats engines, security, trailers, travel areas, operators and claim pay-outs.

Knowing these rules can help you compare cover more clearly and avoid choices that do not fit how or where you use your boat.

This guide explains the parts of a motorboat policy that often need closer attention, including engine damage, outboard security, navigation limits, surveys, agreed value and common exclusions.

For a quick summary of cover or to ask for a quote, visit our motorboat insurance page.

Inboard and outboard engines

Insurers will normally ask whether your motorboat has an inboard or outboard engine.

The type, age, horsepower and value of the engine can affect the policy terms, premium and security rules.

Inboard engines

They install an inboard engine inside the boat's hull.

Inboard-powered craft can include:

• Motor cruisers
• Sports cruisers
• Cabin boats
• Fishing boats
• Larger leisure motorboats

The insurer may ask for:

• The engine make and model
• Engine age
• Horsepower
• Fuel type
• Number of engines
• Maximum designed speed
• Maintenance history
• Details of changes

Damage to an inboard engine may be covered when it results from an insured event. Standard policies do not normally cover an engine simply because it has broken down or worn down over time.

Outboard engines

An outboard engine is mounted outside the boat, normally at the stern.

Outboard motors can be attractive to thieves because they can sometimes be removed and resold quite easily.

For this reason, insurers may ask for:

• Approved outboard locks
• Extra security devices
• Removal of smaller portable engines
• Locked indoor storage
• Trackers or locks
• Engine serial numbers
• Proof of purchase
• Photos of the engine

The requirements can vary by engine size, value and mobility.

Check the security rules carefully before leaving the motorboat alone.

These checks are common in outboard motor theft insurance claims.

Engine damage and breakdown

A motorboat policy may cover engine damage when it is caused by an insured event.

Examples can include:

• Fire
• Theft
• Collision
• Impact
• Flooding after an insured incident
• Accidental damage

This is different from mechanical or electrical breakdown.

Standard motorboat insurance does not normally cover:

• Mechanical breakdown
• Electrical failure
• Wear and tear
• Corrosion
• Slow wear
• Defective parts
• Lack of servicing
• Poor maintenance
• Damage caused by wrong fuel
• Damage from an existing fault

Some insurers may offer extra machinery cover.

Where this is available, check whether it applies to:

• The engine
• Gearboxes
• Drives
• Cooling systems
• Electrical equipment
• Fuel systems
• Older machinery

Extra excesses, age limits and exclusions may apply.

Outboard theft and security rules

Security rules in a motorboat policy are conditions of cover, not just advice.

Depending on the insurer, you may need to use:

• An approved outboard lock
• A trailer hitch lock
• A wheel clamp
• A lock
• A tracking device
• Locked or gated storage
• Extra security when the boat is alone

The policy may also say:

• Where keys must be kept
• Whether a portable outboard must be removed
• Whether the boat can be left on a trailer
• Whether specific devices must be fitted
• Whether proof of fitted security is needed

A theft claim could be affected if the required devices or storage were not in place.

Keep:

• Purchase receipts
• Photos
• Hull ID details
• Engine serial numbers
• Registration documents
• Security-device receipts
• Installation certificates

For practical advice about protecting boats, outboards and trailers, read our boat security and theft-prevention guide.

Trailer and road transit cover

Many motorboats are stored or moved on trailers.

Trailer and transit cover varies between policies.

Depending on the insurer, a policy may cover:

• Accidental damage during road transit
• Theft of the motorboat from the trailer
• Theft of the trailer
• Damage while loading or unloading
• Launching and recovery
• Storage while the boat is on the trailer
• European road transit

Check whether the trailer is:

• Included within the boat's insured value
• Covered under a separate limit
• Listed separately on the policy
• Available only as an optional benefit

You should also check:

• The maximum trailer value
• Security rules
• Whether cover applies when detached from the towing vehicle
• Whether launching damage is included
• Whether recovery costs are covered
• Whether overseas journeys are allowed

The towing vehicle's motor insurance will not normally cover damage to the motorboat itself.

The trailer must also be suitable, maintained, roadworthy and secured in line with the policy terms.

Mooring and storage rules

Where the motorboat is usually kept is an important part of the risk.

The insurer may ask whether the boat is:

• Kept in a marina
• Kept in a harbour
• Kept on a swinging mooring
• Kept on a fore-and-aft mooring
• Stored on a trailer
• Stored in a locked compound
• Kept on a driveway
• Stored ashore during winter
• Left in the water all year

The insurer may also look at:

• Flood exposure
• Storm exposure
• Tidal conditions
• Mooring care
• Site security
• How often the boat is checked
• Winter prep
• Lifting arrangements

Tell the insurer if the boat's normal mooring or storage place changes.

Moving the boat to another marina, mooring or storage site without telling the insurer could affect the policy terms or a future claim.

Laid-up periods and winter storage

Some motorboat policies include a set laid-up period.

During this period, the boat may have to stay:

• Ashore
• At a set place
• Out of use
• Winter ready
• Safely stored

Different excesses or limits may apply during the laid-up period.

Damage caused by poor winter prep, slow wear or lack of maintenance may not be covered.

Check whether the policy needs:

• The engine to be winter ready
• Water systems to be drained
• Batteries to be disconnected
• Valuables to be removed
• The boat to be inspected often
• Covers and moorings to be checked
• Specific storage arrangements

Keep records of servicing, winter prep and inspections.

Navigation and cruising limits

Navigation limits define the area in which the motorboat is insured.

A policy may cover:

• Inland waters only
• Rivers and canals
• Lakes and reservoirs
• UK coastal waters
• A set distance offshore
• Cross-Channel journeys
• European coastal waters
• Named countries or sea areas

The policy may also include:

• Seasonal limits
• Offshore distance limits
• Weather rules
• Rules for longer passages
• Limits on overnight journeys
• Limits on single-handed use

Using the boat outside the agreed navigation limits without permission could affect the cover.

Before a longer journey

Before taking the boat on a longer trip, check:

• Whether the destination is within the policy limits
• Whether Channel crossings are included
• Whether European waters are covered
• Whether extra permission is needed
• Whether seasonal limits apply
• Whether extra safety gear is needed
• Whether the operator meets the experience rules
• Whether overnight passages are allowed
• Whether single-handed use is covered

Contact the insurer before travelling if anything is unclear.

Water-skiing, wakeboarding and towing

Motorboats are often used for towing activities such as:

• Water-skiing
• Wakeboarding
• Kneeboarding
• Towing inflatables
• Towing another boat

These activities may not be covered automatically.

Where cover is available, conditions may apply to:

• The experience of the driver
• The use of a skilled observer
• The number of people onboard
• Safety equipment
• The area
• Third-party liability limits
• Leisure versus commercial use

Competition, tuition and commercial activity may be excluded.

Tell the insurer about any towing activities before buying the policy.

High-speed and high-performance motorboats

Higher-powered or faster motorboats may need specialist underwriting.

The insurer may consider:

• Maximum designed speed
• Engine horsepower
• Number of engines
• Hull design
• Boat length
• Operator experience
• Skills
• Claims history
• Mooring arrangements
• Cruising area

A high-performance motorboat may be subject to:

• A higher excess
• Named operators
• Minimum experience rules
• Restricted navigation limits
• Extra security rules
• A marine survey
• Specialist policy wording

Always give accurate information about the boat's speed, engines and performance.

Racing and competitive use

Standard leisure policies often exclude:

• Racing
• Speed trials
• Timed events
• Competitive events
• Practice for competition

Specialist cover may be available, but it usually needs to be agreed before the activity starts.

Inform the insurer if you will use the motorboat for racing or any organized competitive event.

Commercial and charter use

A standard leisure policy may not cover:

• Passenger hire
• Charter
• Tuition
• Paid excursions
• Deliveries
• Commercial fishing
• Business entertainment
• Hire and reward

Commercial use normally needs specialist insurance.

Using a leisure policy for an undeclared commercial activity could invalidate the cover.

Who can operate the motorboat?

Policies differ in who they allow to operate the boat.

A policy may cover:

• The owner only
• Named operators
• Family members
• Other people using the boat with permission

Restrictions may apply by:

• Age
• Experience
• Skills
• Claims history
• Maximum boat speed
• Navigation area

Do not assume that anyone with your permission is automatically covered.

Check the permitted-operator wording before letting another person use the boat.

Boating experience and training

Some insurers may ask about boating experience and relevant training.

These may include recognised training in:

• Powerboat handling
• Navigation
• Coastal cruising
• Marine radio operation
• Safety procedures

Training does not guarantee a lower premium, but it may help the insurer judge the operator's experience.

Higher-performance and offshore boats may face stricter rules.

Agreed value and market value

The basis used to settle a total-loss claim can be an important difference between policies.

Agreed-value cover

With agreed-value cover, the insurer agrees the value of the boat when the policy begins.

If the boat is later declared a total loss, the agreed amount may be the base of the settlement, subject to the policy terms.

The insurer may ask for:

• A purchase invoice
• A professional valuation
• Recent photos
• A marine survey
• Proof of improvements
• Receipts for major equipment

Review the agreed value at renewal and after major improvements.

Market-value cover

A market-value policy usually settles a total-loss claim according to the boat's value just before the incident.

This may take account of:

• Age
• Condition
• Value loss
• Equipment
• Maintenance
• Previous damage
• Comparable boats for sale

The settlement may therefore be different from the original purchase price.

Low cover

Low cover happens when the insured value is lower than the boat's true value.

This could affect the amount paid after a claim.

Review the insured value after:

• Replacing the engine
• Installing major new equipment
• Refitting the interior
• Completing structural work
• Making major improvements
• Big changes in market value

Tell the insurer about material changes and keep receipts or valuations.

Marine surveys and valuations

An insurer may ask for a marine survey before offering cover.

A survey is more likely to be requested when the motorboat is:

• Older
• High value
• Oddly built
• Home-built
• Heavily changed
• In poor shape
• New to the insurer

A marine survey may assess:

• The hull
• Structural condition
• Machinery
• Fuel systems
• Electrical systems
• Steering
• Sea valves
• Safety equipment
• General maintenance

The insurer may ask for repairs or recommendations to be done before full cover is given.

Survey versus engine inspection

A marine survey is not always the same as an engine inspection.

A general survey may not include a full internal check of the engine.

For an older or higher-value boat, the insurer may ask for:

• A hull survey
• An engine inspection
• A valuation
• An electrical inspection

Ask the insurer exactly what type of report is needed.

A survey requested for insurance should not automatically be treated as a full pre-purchase inspection.

Anyone thinking of buying a used motorboat should discuss the right survey with a qualified marine surveyor. Our guide to buying your first motorboat covers other things to think about before you buy.

Salvage and wreck-removal cover

After a serious incident, the motorboat may need to be recovered, salvaged or removed.

These costs can be high, especially if the boat:

• Sinks
• Grounds
• Blocks a waterway
• Presents a pollution risk
• Must be recovered from a hard-to-reach place

Check whether salvage and wreck-removal costs are:

• Included within the boat's insured value
• Paid in addition to the insured value
• Subject to a separate limit
• Included within the liability limit

This can make a big difference after a major loss.

Policy excesses

The excess is the amount you must pay towards a claim.

A policy may include:

• A compulsory excess
• A voluntary excess
• A separate theft excess
• A machinery excess
• A storm-damage excess

Choosing a higher voluntary excess may lower the premium, but it raises the amount you must pay after a claim.

Check how you apply multiple excesses and ensure that the total amount is affordable.

For more information about the things that affect premiums, read our guide to the cost of boat insurance.

Common motorboat policy exclusions

Exclusions differ by insurer, but common examples can include:

• Wear and tear
• Slow wear
• Corrosion
• Rust
• Osmosis
• Mechanical breakdown
• Electrical breakdown
• Poor maintenance
• Defective design
• Defective construction
• Existing damage
• Undeclared changes
• Racing
• Speed testing
• Commercial or charter use
• Use outside navigation limits
• Theft where security rules were not followed
• Damage caused by an unapproved operator
• Loss while the operator is under the influence of alcohol or drugs

Do not rely on a cover summary alone. Read the full policy wording and schedule.

Wear, maintenance and slow wear

Insurance is generally meant to cover sudden insured incidents rather than routine maintenance.

Wear and slow wear can come from:

• Age
• Repeated use
• Weather exposure
• Salt water
• Corrosion
• Lack of maintenance

The policy may require the motorboat to be kept in a seaworthy and well-maintained condition.

This may include:

• Regular engine servicing
• Hull inspections
• Mooring checks
• Winter prep
• Replacing worn equipment
• Keeping safety systems working
• Following maker advice

Keep service records, receipts and inspection reports.

To learn more about boat maintenance, engine, electrical, and weather problems, check out our guide for boat owners.

Personal belongings and equipment

Some policies can cover personal belongings and boating equipment.

This may include:

• Navigation equipment
• Safety equipment
• Clothing
• Portable electronics
• Fishing equipment
• Tools
• Mooring equipment

Limits and exclusions may apply, and some items may need to be listed separately.

Check whether belongings are covered:

• While onboard
• During transit
• While stored ashore
• When left alone
• Outside the UK

Cash, jewellery, mobile phones and other valuables may be excluded or subject to lower limits.

Personal accident cover

Personal accident cover may pay a fixed benefit if an insured person suffers a serious injury or dies after an accident involving the boat.

This is different from third-party liability cover.

Check:

• Who is insured
• What injuries are covered
• The benefit limits
• Age limits
• Activity exclusions
• Whether towing activities are included

Personal accident cover may be included or offered as an optional benefit.

Emergency assistance

Some insurers provide emergency help or access to a helpline.

This may include support after:

• Breakdown
• Grounding
• Collision
• Fire
• Loss of steering
• Fuel problems
• Electrical failure

Do not assume that all towing, recovery or breakdown costs are covered.

Check:

• The area
• Maximum call-out limits
• Towing rules
• Excluded causes
• Whether offshore help is available
• Whether separate membership is needed

Changes to report

Tell the insurer if there is a material change to the risk.

This could include:

• Fitting a new engine
• Increasing the horsepower
• Changing the mooring
• Changing the storage place
• Increasing the boat's value
• Making major changes
• Adding a new operator
• Beginning commercial use
• Entering races or competitions
• Extending the navigation area
• Taking the boat to Europe
• Starting water-skiing or towing activities

Do not wait until a claim to disclose a major change.

Making a motorboat insurance claim

If an incident occurs, take reasonable steps to prevent more loss or damage without putting anyone in danger.

Depending on the situation, you may need to:

• Contact the emergency services
• Make sure everyone is safe
• Prevent more damage where possible
• Notify the harbour or navigation authority
• Report theft or vandalism to the police
• Get a crime reference number
• Take photos
• Collect witness details
• Keep damaged items
• Contact the insurer promptly
• Avoid admitting liability

Follow the insurer's claims instructions.

Do not arrange major repairs without approval unless emergency action is needed to prevent more damage.

Our 10-step boat safety checklist provides general preparation and safe-operation advice.

Evidence that can support a claim

The insurer may ask for:

• Photos
• Purchase invoices
• Repair estimates
• Survey reports
• Maintenance records
• Engine service records
• Police reports
• Witness statements
• Marina reports
• Weather evidence
• Proof of ownership
• Security-device evidence

Good record-keeping can make the claims process easier.

Technical motorboat insurance FAQs

Does boat insurance cover engine failure?

Standard policies do not normally cover mechanical or electrical breakdown.

Insurance may cover engine damage if it is caused by an insured event, such as fire, theft, collision, or accidental damage.

What is the difference between insured engine damage and breakdown?

Insured damage is usually caused by a sudden event covered by the policy.

Breakdown usually means an internal failure, a bad part, wear or slow wear. This is often excluded unless extra machinery cover has been added.

What are navigation limits?

Navigation limits define the area in which the boat is insured.

They may restrict offshore distances, countries, sea areas, seasons or some journey types.

Does agreed value differ from market value?

Yes.

The insurer sets the agreed value when the policy begins. Market value is based on what the boat was worth just before the loss.

The settlement basis depends on the policy wording.

When might an insurer require a marine survey?

A survey may be needed for an older, higher-value, modified, home-built or oddly built boat.

The insurer may also ask for a survey if it has worries about condition or care.

Are salvage costs included in the insured value?

This varies by policy.

The insured value may include salvage and wreck-removal costs, pay them in addition, or be subject to a separate limit.

Can changing the engine affect the insurance?

Yes.

A new or more powerful engine can change the boat's value, speed and risk. Inform the insurer before or immediately after changing the engine.

Can changing the mooring affect the policy?

Yes.

A different marina, harbour, mooring or storage place may have a different theft, storm or flood risk. You should tell the insurer about the change.

Can security rules affect a theft claim?

Yes.

A theft claim may be affected if the required locks, storage arrangements or other security rules were not followed.

Related guides

You may also find these guides useful:

• Buying your first motorboat
• Boat security and theft prevention
• Guide to the cost of boat insurance
• Common issues for boat owners
• 10-step boat safety checklist
• Guide to different types of boat

Check the policy details before buying

Motorboat policies can differ in their treatment of engines, trailers, security, operators, navigation areas, surveys and claim settlements.

Read the policy wording and schedule carefully, and make sure the cover matches how and where the boat will be used.

When you are ready, you can compare motorboat insurance quotes.

Cover is subject to insurer terms, conditions, limits and exclusions.

Q&A

Question: What should I check if I keep my motorboat on a trailer at home or in storage?

Short answer: Check whether the trailer is covered, whether it has a separate limit, and what security rules apply when the boat is on the trailer. The policy may need hitch locks, wheel clamps, locked or gated storage, or extra protection when the boat is alone. You should also confirm if the insurance covers theft or damage when the trailer is detached from the towing vehicle.

Question: Why is it important to tell the insurer before changing the engine or increasing horsepower?

Short answer: A new or more powerful engine can change the boat's value, speed, performance and theft risk. These factors may affect the premium, excess, navigation limits, permitted operators or security rules. If the insurer is not told about a major change, it could affect the policy terms or a future claim.

Question: What documents and evidence should I keep before any claim occurs?

Short answer: Keep purchase invoices, photos, engine serial numbers, hull ID details, service records, survey reports, valuation evidence, security-device receipts and installation certificates. Good records can help prove ownership, condition, value, maintenance and compliance with policy security rules.

Question: Does a marine survey mean the engine has been fully inspected?

Short answer: Not always. A basic marine survey checks the hull, structure, systems, and overall condition, but not the engine internally. For older or pricier boats, insurers might request separate inspections for engines, valuation, or electrical systems.

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