Category: Marine · Reviewed by Al Jabbar, Broker · Specialist Risks · Last reviewed 2026-06-05
Marine insurance is the class of indemnity insurance covering ships, cargo, freight and associated liabilities against losses connected with a maritime adventure, governed in England and Wales by the Marine Insurance Act 1906 and modern Institute Clauses.
Category: Marine insurance Also known as: sea insurance, ocean marine insurance First codified: Marine Insurance Act 1906; earlier Lloyd’s SG Form (17th–19th century) Related legislation: Marine Insurance Act 1906 [1]; Insurance Act 2015 [2]; Carriage of Goods by Sea Act 1992 [3]
Marine insurance is the oldest organised branch of insurance and the historical foundation of the wider London market. It indemnifies an insured with insurable interest in a marine adventure against the losses incident to that adventure. A ‘marine adventure’ includes any situation in which insurable property is exposed to maritime perils, in which the earning of freight, passage money, commission or profit is endangered by exposure of insurable property to such perils, or in which liability to a third party may be incurred by the owner of, or person responsible for, insurable property in consequence of maritime perils [1].
The class divides into four traditional branches. Hull and machinery covers the ship itself, including its engines and equipment. Cargo insurance covers goods in transit. Freight covers the carrier’s expectation of earning carriage. Marine liability covers third-party exposures, including collision liability under hull clauses and the broader mutual cover provided by Protection and Indemnity Clubs [4][5].
In modern practice ‘marine’ is read more broadly than its name suggests. Cargo policies routinely cover transit by sea, air, road, rail and inland waterway. Energy policies covering offshore platforms, drilling rigs and subsea infrastructure are commonly written within the marine market. Builders’ risks for newbuild vessels and yachts, ports and terminals liability, marine warranty surveying and specie cover for bullion and fine arts in transit are all treated as marine business in the London market [4][5].
Marine business is written in both the Lloyd’s market through specialist syndicates and managing agents and the company market through insurers and reinsurers regulated by the Prudential Regulation Authority and the Financial Conduct Authority [6].
The Marine Insurance Act 1906 (‘the MIA 1906’) codifies the common law of marine insurance as developed by courts during the 18th and 19th centuries, much of it through cases heard by Lord Mansfield. The statute remains the foundation of the contract and applies to any contract of marine insurance whether issued at Lloyd’s, in the London company market or elsewhere [1].
Key sections include: s.4 prohibiting wagering contracts; s.5 defining insurable interest; s.17 imposing utmost good faith (substantially modified for non-consumer business by the Insurance Act 2015); s.18–20 governing disclosure and representations (now superseded for commercial contracts by the duty of fair presentation under the Insurance Act 2015); s.33–41 governing warranties; s.39 the warranty of seaworthiness in voyage policies; s.55 setting out perils insured and excluded; s.64–66 defining the various forms of average; s.78 sue and labour; and s.79 subrogation [1][2].
The Insurance Act 2015 modernised the duty of disclosure and the law of warranties. Breach of warranty now suspends rather than discharges the insurer’s liability, and the insurer must pay sums due within a reasonable time under s.13A. The Consumer Insurance (Disclosure and Representations) Act 2012 applies different rules to consumer marine policies (typically pleasure craft) [2].
Carriage of goods by sea between commercial parties is governed by international conventions, notably the Hague Rules 1924, the Hague-Visby Rules 1968 and the Hamburg Rules 1978, enacted in English law principally through the Carriage of Goods by Sea Act 1971 and the Carriage of Goods by Sea Act 1992 [3]. International Maritime Organization conventions, including SOLAS, MARPOL and the Maritime Labour Convention, set the regulatory framework within which marine risks arise [7].
A typical marine programme is structured around the principal exposures of the assured. A shipowner buys hull and machinery cover for the vessel, P&I cover for third-party liabilities through one of the mutual clubs that comprise the International Group, and may add cover for freight, demurrage and defence, war risks, loss of hire and increased value. A cargo owner buys cargo cover on either a per-shipment basis or an annual open cover, choosing between ICC (A), (B) or (C) wordings depending on the commodity and route [4][5].
Placement is generally through specialist marine brokers. London market business is typically subscription business in which multiple syndicates and insurers take a share of the risk under a single slip, with one leader setting terms and following markets supporting on the agreed wording. Standard wordings are the Institute Clauses published by the Joint Hull Committee, Joint Cargo Committee and Joint War Committee, supplemented by bespoke endorsements [5].
Claims are handled by specialist claims teams within insurers, by independent marine surveyors and by average adjusters. Hull claims often involve a collision liability or a grounding investigated by surveyors at the port of refuge. Cargo claims typically involve appointment of a surveyor at destination, recovery against the carrier subject to convention limits, and where applicable contribution to general average administered under the York-Antwerp Rules [1][4].
Hull and machinery is written either on the International Hull Clauses 1/11/03 or, more commonly, the older Institute Time Clauses–Hulls 1/11/95 or 1/10/83. Yacht business uses bespoke pleasure-craft wordings. War risks are written on Institute War and Strikes Clauses, often through the mutual war risks associations.
Cargo cover is provided under ICC (A), (B) or (C), with War and Strikes clauses commonly added. Specie cover, project cargo, fine arts and stock throughput are specialist sub-classes.
Marine liability insurance extends beyond P&I to include charterers liability, ship repairers, stevedores, terminal operators, marina operators and ports and harbours. Marine umbrella cover provides an excess layer above the primary marine programme.
A UK-based shipowner operates a small fleet of three product tankers. The fleet is insured for hull and machinery values totalling £45m through a subscription placement of seven syndicates led by a Lloyd’s marine syndicate, on Institute Time Clauses–Hulls 1/11/95 with 3/4ths running-down clause. P&I cover is placed with a member of the International Group on standard club rules with the International Group pool and reinsurance contract above. Freight, demurrage and defence cover is bought from the same club. War risks are placed separately through a mutual war risks association. The annual premium for the H&M placement is illustrative only and depends on age of vessels, claims record and trading area; the overall programme is reviewed at renewal each year with the broker advising on changes to wordings and the placement panel.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-05. Next review: 2026-12-05.
Apex Insurance Brokers Limited. Authorised and regulated by the Financial Conduct Authority, FRN 724952. Registered in England and Wales, Companies House 07014570. This entry provides general information about UK insurance concepts and is not regulated advice. Consult your insurance broker on your specific position.
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