What Is Inland Marine Insurance and What Does It Cover?

Inland marine insurance covers business property that moves: equipment traveling between jobsites, goods in transit on trucks, materials waiting to be installed, and customers' property in your care. Despite the name, it has nothing to do with boats. It exists because commercial property insurance largely stops at the walls of your building, and most businesses own property that doesn't stay there.

If you've ever seen "inland marine" on an insurance proposal and wondered why a landlocked contractor needs marine coverage, you're not alone. The name is a historical accident, but the coverage behind it solves a very current problem. Here is what it covers, how it differs from your property policy, and how the most common forms work.

Inland Marine Insurance

Inland marine insurance is property coverage for goods and equipment that move: property in transit, at jobsites, in storage, or in someone else's care. It descends from ocean marine insurance and fills the gaps a location-based property policy leaves open.

Why is it called inland marine insurance?

The name comes straight from the coverage's ancestry. Ocean marine policies insured cargo crossing the seas against a wide range of perils, while early property policies covered a building at a fixed location against fire and little else. When cargo came ashore and kept moving by barge, rail, and wagon, marine insurers followed it inland, and the policies they wrote became known as inland marine. The label stuck even as the coverage expanded far beyond transit.

Today most inland marine forms are called floaters because they are not tied to a listed location, the coverage floats with the property anywhere in the coverage territory. Many of the standard forms in this line are published by the American Association of Insurance Services (AAIS) rather than ISO, which is why inland marine form numbers look different from the CP and CG numbers on the rest of your policy. Plenty of insurers also write their own proprietary versions.

What does inland marine insurance cover?

Inland marine is a category, not a single policy. It covers business property with a mobility or transportation element, and the coverage is sold as separate floaters that each address one exposure. Nearly every business has at least one of these:

• Property in transit: a transportation floater covers your goods while they travel, and motor truck cargo coverage protects a trucker hauling other people's freight.
• Contractors equipment: contractors equipment insurance covers cranes, backhoes, generators, forklifts, and tools on your premises, at jobsites, and in transit. Despite the name, farms, golf courses, and warehouses use it too.
• Installation floaters: cover a contractor's materials, from the moment they leave the supplier, through transit and jobsite storage, until they are installed and accepted.
• Builders risk: covers a structure under construction, and can extend to materials in transit to the site or stored off-site. Our builders risk guide covers it in depth.
• Bailee coverage: protects customers' property in your care, the dry cleaner's racks, the repair shop's bench. Once a customer's insurer pays for property you damaged, it can come after you for reimbursement, and your liability policy probably won't respond.
• Electronic data processing (EDP) floaters: cover computer hardware and electronic data on broader terms than the property policy offers.

How is inland marine different from commercial property insurance?

The difference is geography. A commercial property policy built on the Building and Personal Property Coverage Form (CP 00 10) covers your business personal property in the described building, or in the open within 100 feet of the building or premises.

Past that line, coverage falls off a cliff. The off-premises extension gives you just $10,000, property in transit gets only $5,000 under the Causes of Loss Special Form, and builders' machinery and tools away from your premises are covered only for specified causes of loss, a list that does not include theft. Inland marine forms flip the logic: coverage follows the property, usually on open perils terms, with limits you actually chose.

Here is how the two approaches compare for property that leaves the building:

Inland marine forms also tend to be broader and more flexible than property forms covering the same item. Contractors equipment floaters, for example, often include flood and earthquake, perils the standard property policy excludes outright. That flexibility is why a machine that technically could sit on your property policy is often insured on a floater anyway.

What are the common types of inland marine floaters?

Buyers usually meet inland marine through one of a handful of standard floaters. The five you will see most often are bailee coverage, builders risk, installation floaters, contractors equipment, and transportation coverage, and brokers routinely combine two or three of them for a single contractor.

A plumber might carry an installation floater for fixtures headed to jobsites, a contractors equipment floater for the excavator and tools, and rely on the general contractor's builders risk for the structure itself. Add motor truck cargo for haulers, warehouse legal liability for storage operators, and EDP floaters for technology-heavy firms, and the category covers most property that a location-based policy handles poorly. The right question is never "do I need inland marine" but "which of my property moves, and what covers it while it does."

How is property valued under an inland marine policy?

Valuation deserves as much attention as the limit, because inland marine forms use several different approaches. Contractors equipment is often insured at actual cash value, replacement cost minus depreciation, with many insurers reserving replacement cost for items around five years old or newer. Installation floaters typically value a loss at the cost to repair, replace, or rebuild with materials of like kind and quality, including labor, reasonable overhead and profit, and delivery charges.

An agreed amount option locks in a stated value at inception for hard-to-value or modified equipment. Ask which basis applies to each item before you sign, not at claim time.

Coinsurance adds a second trap. Many floaters are written with an 80, 90, or 100 percent coinsurance clause, which penalizes you for insuring property below the required percentage of its value. A contractor who insures $30,000 of jobsite materials for $20,000 under an 80 percent clause needed a $24,000 limit, so even a $10,000 partial loss gets shaved at settlement. Values move with the used-equipment market, so review schedules yearly. Book value and original purchase price are the two most common wrong answers.

This guide is for educational purposes and summarizes standard ISO and AAIS policy language. Your policy's specific terms, conditions, and endorsements control. Talk to a licensed broker about your actual exposures.