Hull and Machinery Insurance: H&M Yacht Guide

Quick answer: Hull and Machinery (H&M) insurance is the physical-damage layer of yacht cover — it pays to repair or replace your hull, engines, and permanently attached equipment after collision, grounding, fire, theft, or qualifying weather events. Private yachts typically see H&M premiums around 0.5–1.5% of agreed hull value per year, with flat deductibles often in the $2,500–$10,000 range and separate windstorm deductibles in hurricane zones. Buy agreed value, not actual cash value. This guide explains coverage scope, deductibles, sub-limits, survey conditions, and how H&M connects to P&I in your full programme — see our yacht insurance guide for the complete picture.

What Is Hull and Machinery Insurance on a Yacht?

Hull and Machinery insurance — abbreviated H&M in broker paperwork and Lloyd’s slips — is the first layer most yacht owners think about when they say “boat insurance.” It indemnifies physical loss or damage to the insured vessel: the hull shell, deck structure, machinery, generators, fixed electronics, and equipment bolted or permanently wired to the yacht.

H&M does not cover your legal liability to third parties. That is Protection and Indemnity (P&I), a separate contract we cover in our P&I yacht insurance guide. A hull-only policy leaves you exposed to bodily-injury and property-damage claims that can exceed the value of the vessel tenfold.

The peril basis matters. Most yacht H&M policies are written on an “all risks” or “named perils plus” basis for the hull, meaning sudden fortuitous events are covered unless specifically excluded. Gradual deterioration, osmotic blistering, and maintenance neglect are routinely excluded — insurers pay for the lightning strike, not the five seasons you skipped bottom paint.

Typical covered events under H&M:

Peril category	Examples	Common exclusion or condition
Collision / contact	Hitting a dock, another vessel, submerged object	Racing contact may be excluded
Grounding	Sand bar, reef, channel edge	Chart negligence may affect claim
Fire / explosion	Engine room fire, electrical short	Fuel system neglect may be disputed
Weather	Named storm, lightning, hail	Hurricane plan compliance required in FL
Theft / vandalism	Outboard stolen, electronics taken	Tender limits may apply separately
Sinking / flooding	Through-hull failure after collision	Gradual leak from worn hose excluded

For how H&M fits alongside financing requirements and total ownership budgeting, cross-read our yacht ownership cost guide and yacht financing guide.

Agreed Value vs Actual Cash Value: The H&M Decision That Matters Most

On total loss — fire, sinking, catastrophic storm damage — the basis of indemnity determines whether you receive $500,000 or $280,000 for the same event.

Agreed value locks the insured hull amount at policy inception (subject to renewal adjustment). Total loss pays that figure in full. No depreciation arithmetic at claim time.

Actual cash value (ACV) pays fair market value at the date of loss. A 12-year-old motor yacht purchased for $650,000 might settle at $380,000–$420,000 under ACV terms. The premium savings are real but small relative to the gap.

Insider tip: When a broker quotes “hull cover” without stating the basis, ask directly: “Is this agreed value or ACV on total loss?” If the answer is vague, treat it as a red flag. Marine lenders almost always require agreed value — binding ACV without telling the bank can breach your loan covenants.

Agreed value renewal mechanics vary by underwriter:

Renewal trigger	Typical insurer response
Major refit ($50K+ systems work)	Re-survey or owner declaration; value increase
Engine replacement	Update machinery schedule; possible premium bump
Market softening	Some insurers reduce agreed value at renewal
Partial loss repaired	Agreed value usually unchanged unless total rebuild
Owner requests increase	Survey or broker valuation letter often required

How H&M Deductibles Work — Flat, Percentage, and Windstorm

The deductible is the owner’s retained loss before the insurer pays. On yacht H&M, three deductible structures appear repeatedly.

Flat deductibles apply per occurrence. Common ranges:

Vessel size / value band	Indicative flat H&M deductible
under 40 ft, under $150K value	$1,000–$2,500
40–60 ft, $150K–$500K	$2,500–$5,000
60–80 ft, $500K–$2M	$5,000–$15,000
over 80 ft / superyacht	$15,000–$50,000+ (policy-specific)

Percentage deductibles express retention as a share of hull value — often 1% for certain perils or territories. On a $800,000 agreed value, 1% means the first $8,000 of each qualifying claim is yours.

Windstorm / named-storm deductibles are separate retentions triggered by hurricane or tropical-storm definitions in the policy. In Florida and Gulf waters these commonly run 2–5% of hull value. A $600,000 yacht with a 3% windstorm deductible retains the first $18,000 on storm damage — before any flat deductible logic applies on some wordings.

Red flag: Comparing two H&M quotes where one shows a $2,500 flat deductible and the other shows $2,500 flat plus 2% windstorm is not an apples-to-apples comparison. Normalise deductibles before you normalise premium.

Deductible buy-down endorsements exist on some programmes — you pay extra premium to reduce windstorm retention. Worth modelling if you keep the boat in South Florida year-round.

Machinery, Electronics, and Sub-Limits Inside H&M

The hull value on your certificate is not always one undifferentiated number. Underwriters schedule machinery and may cap certain equipment categories.

Main engines and generators are usually included in hull value if permanently installed. Repowering during the policy year requires notification — an unreported 40% power increase after a engine swap has triggered partial denial in past claims where the new installation contributed to failure.

Navigation and communication electronics may carry a sub-limit unless itemised. A $40,000 Furuno suite on a $350,000 hull policy might be covered in full on good wordings, but some policies cap electronics at 10–15% of hull value unless scheduled.

Tenders and water toys blur the line between H&M and separate endorsements. A 14-foot RIB stored on davits is often within hull cover; the same tender operating independently two miles from the mother ship may fall outside unless endorsed. Confirm tender LOA limits and whether separate operation is covered.

Personal effects — clothing, cameras, fishing tackle in cabins — are typically excluded or capped at a few thousand dollars. Do not assume your homeowner policy picks up onboard personal property; many exclude watercraft over length thresholds.

Machinery breakdown without an insured peril remains the most common coverage dispute. A seized raw-water pump from overdue impeller replacement is maintenance, not H&M. A seized pump after ingesting debris during a grounding collision sequence may be covered as part of the grounding claim — facts and adjuster interpretation decide.

Survey Requirements and Conditions of Coverage

Marine underwriters treat the survey as the underwriting photograph of your risk. For vessels over ten years old, an in-water survey by a credentialed surveyor is standard.

Typical survey conditions:

• Age trigger: 10+ years since build or last major refit
• Survey age: 24–36 months maximum at binding (insurer-specific)
• Credential: ABYC, NAMS, or equivalent recognised body
• Scope: Hull, deck, rig (sail), machinery, systems, safety gear
• Follow-up: Deficiencies rated “recommend repair” may become binding conditions

A survey listing corroded exhaust risers and a fuel hose past replacement interval can produce a coverage condition: “Replace port fuel line from filter to engine before policy effective date.” Ignoring that letter and suffering an engine-room fire three months later invites a coverage fight.

Our yacht survey checklist walks through what surveyors examine — useful both at purchase and before insurance renewal. If you are buying, align the purchase survey with insurance underwriting so you do not pay twice in the same month.

New-build yachts under two years old often bind without a separate insurance survey, using builder specifications and delivery documentation instead. Custom builds may still require a sea-trial report.

H&M Premium Drivers: What Moves Your Rate

H&M is individually underwritten. Two identical-looking 52-foot motor yachts at the same marina can quote 40% apart depending on owner profile and policy structure.

Primary rating factors:

Factor	Lower rate signal	Higher rate signal
Cruising territory	Maine summer, Great Lakes	Florida year-round, Caribbean
Owner experience	USCG licence, 500+ offshore miles logged	First season, no documented training
Claims history	Clean five years	Two hail claims in three years
Vessel age	3-year-old production hull	25-year-old without refit documentation
Mooring	Hurricane-rated marina, full-time dockmaster	Unprotected mooring ball
Use	Private pleasure, 80 engine hours/year	Liveaboard, high annual mileage
Safety kit	AIS, EPIRB, automatic fire suppression	Missing USCG-required equipment

Indicative annual H&M premium as % of agreed hull value:

Risk profile	Indicative H&M rate (% of hull value)
Coastal Northeast, newer boat, experienced owner	0.4–0.8%
US East Coast ICW, mid-age trawler	0.7–1.2%
Florida / Gulf hurricane exposure	1.0–2.0%+
Offshore passage programme	1.2–2.5% (endorsement-dependent)
Charter without commercial endorsement	Often declined or rated commercially

These ranges are orientation only — bind only on formal quotes with full wording.

Total Loss, Partial Loss, and Salvage

Partial loss — the more common outcome — pays repair costs minus deductible, subject to policy limits and betterment rules. Insurers may depreciate certain components (canvas, batteries) even on agreed-value hull policies for partial repairs. Read the “new for old” clause.

Constructive total loss occurs when repair cost exceeds a policy percentage of agreed value — commonly 75–80%. The insurer may elect to pay total loss rather than fund a rebuild.

Salvage rights belong to the insurer after they pay total loss. Do not sell wreckage without insurer consent. Partial salvage awards can offset deductibles on some wordings.

Agreed value total loss pays the certificate amount. Outstanding marine finance is satisfied first via the loss payee clause; surplus goes to the owner.

Document everything at first notice of loss: photos, timestamps, witness statements, VHF recordings if available. Delayed notice is a coverage defence insurers actually use.

H&M Exclusions Every Owner Should Read

Insurance pays sudden accidental loss, not slow neglect. High-frequency exclusions:

• Wear, tear, and gradual deterioration — osmosis, gelcoat crazing, routine corrosion
• Inherent vice — design defect known to class unless specifically covered
• Unseaworthiness you knew about — sailing with a flagged structural issue
• Racing unless endorsed — club round-the-buoys counts on many wordings
• Commercial use — charter days without commercial endorsement
• War and confiscation — standard market exclusion
• Nuclear and pollution fines — regulatory penalties excluded; cleanup may fall to P&I
• Ice damage in excluded latitudes unless territory endorsement includes high latitudes

Insider tip: Keep a maintenance log with dated invoices. When an engine-room fire claim arrives, the log is your best evidence the fuel line was not “obviously neglected for seasons.”

Binding H&M: Broker Workflow and Lender Coordination

Specialist marine brokers access Lloyd’s syndicates and admitted US marine markets. For yachts over 40 feet or $100,000 in value, avoid generic homeowner endorsements.

Binding checklist:

1. Confirm agreed value basis and certificate amount
2. List all navigation limits and intended passages for the policy year
3. Schedule machinery and high-value electronics if sub-limits apply
4. Name loss payee / mortgagee exactly as lender requires
5. Obtain hurricane plan approval if in FL / Gulf / Caribbean territory
6. File survey and deficiency clearance before effective date
7. Compare windstorm deductible and flat deductible side by side across three quotes

Lenders from our yacht financing guide typically require evidence of insurance within 10–15 days of closing. Gap days between closing and effective H&M are a documented risk — coordinate effective time with your closing attorney.

How H&M Connects to Your Full Insurance Programme

H&M is necessary but not sufficient. A complete private-yacht programme stacks:

• H&M — physical damage to your vessel
• P&I — third-party bodily injury, property damage, wreck removal, pollution
• Medical payments — first-party guest injury regardless of fault
• Uninsured boater — US coastal relevance
• Crew coverage — if professional captain or mate on payroll

Our yacht insurance guide maps the full stack, Florida hurricane rules, and Mediterranean port liability minimums. If you cruise Florida, pair this H&M deep-dive with yacht insurance Florida. Med-season owners should read Mediterranean yacht insurance.

Territory changes mid-year — deciding to extend a Bahamas trip through August in Florida waters — require endorsement. Operating outside navigation limits can void cover entirely.

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Where H&M fits in the buyer journey

Treat this H&M guide as one layer in a wider risk review. Budget premiums in the ownership cost guide, confirm registration and loss-payee wording in the flag registration guide, then send your vessel brief through our matched shortlist if you want broker introductions for binding quotes.

Source and underwriter note

H&M terms depend on policy wording, survey condition, navigation limits, and insurer appetite. Use the ranges here to prepare broker questions — confirm every warranty, deductible, exclusion, and sub-limit with a specialist marine underwriter before binding cover.

Buyer scenarios for hull and machinery insurance

Weekend coastal owner (hull and machinery insurance): Plan 40–60 sea days per year within 200 nm of home port. Prioritise simple systems, familiar yards, and insurance in a jurisdiction your lender accepts.

Liveaboard cruiser (hull and machinery insurance): You need passage-making range, comfortable berths, and predictable service networks in the Med or Caribbean. Budget 15–25% of hull value annually for running costs on this use case.

Charter-offset investor (hull and machinery insurance): You accept crew, management, and VAT/flag planning in exchange for limited personal weeks. Treat charter income as uncertain — never as guaranteed yield.

Apply this lens to hull and machinery insurance before you sign any MOA or build contract.

Frequently Asked Questions

What does Hull and Machinery insurance cover on a yacht? +

H&M covers physical damage to the yacht itself — hull, superstructure, engines, generators, navigation electronics, and permanently attached equipment. Covered perils typically include collision, grounding, fire, theft, lightning, and named-storm damage where policy conditions are met. It pays repair costs or, on total loss, the agreed or actual cash value depending on policy terms.

What is a typical H&M deductible on a yacht policy? +

Flat deductibles on private yacht H&M policies commonly run $1,000–$5,000 per claim for vessels under 60 feet, rising to $5,000–$25,000 for larger yachts. Hurricane-exposed territories often add a separate windstorm deductible — commonly 2–5% of hull value — that applies before the standard deductible. Always confirm both deductibles in writing before binding.

Is agreed value or actual cash value better for H&M? +

Agreed value is the industry standard for yachts worth $100,000 or more. On total loss, the insurer pays the full insured amount with no depreciation deduction. Actual cash value pays market value at loss, which can be 30–50% below purchase price on older vessels. The modest premium difference for agreed value rarely justifies the coverage gap.

Do marine lenders require Hull and Machinery insurance? +

Yes. Virtually every marine lender financing a yacht purchase requires H&M insurance naming the lender as loss payee or mortgagee. Coverage must typically equal the loan balance or agreed hull value, whichever is higher. Lapse in H&M cover can trigger loan default provisions — confirm renewal dates align with lender requirements.

Does H&M cover engine breakdown without a collision or fire? +

Standard H&M policies exclude mechanical or electrical breakdown unless caused by an insured peril such as collision, fire, or flooding from an external source. Wear-and-tear, impeller failure, and overdue maintenance are not covered. Some underwriters offer mechanical breakdown endorsements — confirm scope and sub-limits if you want this layer.

How does a marine survey affect H&M underwriting? +

Underwriters for vessels over ten years old typically require an in-water survey by an ABYC- or NAMS-certified surveyor dated within 24–36 months. The survey sets the agreed value basis and may list deficiencies that must be corrected as conditions of coverage. A clean recent survey strengthens premium negotiation.

What H&M premium should I budget for a private yacht? +

Indicative H&M premiums for private cruising yachts commonly run 0.5–1.5% of insured hull value annually, before territory and experience adjustments. A $400,000 yacht might see $2,000–$6,000 in hull premium. Hurricane zones, offshore passages, and recent claims push rates toward the upper end. Obtain at least three specialist quotes.