Inland Marine Insurance Explained
Inland marine insurance covers business property that moves, travels or sits somewhere other than your own address, from a crew’s tools to a customer’s goods in your care. This guide explains the odd name, the definition behind it, the forms small businesses use and how the limits are set.
Inland marine in brief
- It is property insurance for things that move or live away from your premises, which a commercial property policy reaches only at the address it lists.
- The name comes from ocean cargo insurance, and a definition adopted by insurance regulators still decides what qualifies.
- Policies are usually built as floaters for one kind of property: tools, installations, cargo or customers’ goods.
- Vehicles are never part of it; they belong on commercial auto.
Why property on land is insured as “marine”
Inland marine grew out of ocean marine insurance, the transportation coverage for ships and their cargo, and kept the marine name as that protection reached property on land. IRMI’s summary of the Nationwide Marine Definition says property that qualifies generally must be movable, be in transit, or have some other relationship to transportation or communication.
That last category explains a few surprises on the list. Bridges, tunnels, pipelines, power and phone lines, radio and TV towers and outdoor cranes are inland marine risks under the definition, because they are instruments of transportation and communication even though none of them moves.
The marine definition California applies
Regulators’ Nationwide Marine Definition decides what can be written on a marine form, and California still applies its 1953 version rather than the NAIC’s 1976 revision.
The NAIC’s revision sorts marine risks into six groups: imports, exports, domestic shipments, instrumentalities of transportation and communication, personal property floaters and commercial property floaters. The commercial group is where most business policies sit, including installation and builders risks, contractors’ mobile equipment, property in the hands of bailees, and accounts receivable and valuable papers. The 1953 version contains most of the same classes but has no electronic data processing class.
What inland marine insurance coverage protects
Insureon describes inland marine as a type of property insurance designed for movable items. Its coverage list includes property in transit over land, property stored off site, property in your temporary care, equipment in a fixed but movable spot, such as a pressure washer mounted on a truck, and portable electronics.
The line that matters is the address. A commercial property policy covers business property at the location listed on the policy, and inland marine protects the property once it leaves that address. A landscaper’s mowers on a trailer, a photographer’s cameras at a venue and a repair shop holding a customer’s equipment all fall on the inland marine side. The truck pulling the trailer does not: Insureon notes that inland marine does not cover vehicles, which need commercial auto.
Common inland marine forms for small businesses
Most buyers meet inland marine through one of these forms, each named by Insureon or listed as a marine class by the IMUA:
- Contractor’s equipment or tools floater: the crew’s tools and machines on trucks and job sites, explained on our tools and equipment insurance page.
- Installation floater: fixtures and systems an installer is putting in, such as HVAC units damaged before the customer accepts the work.
- Builders risk: the structure and materials during construction; IRMI says most builders risk is written on inland marine forms, and our builders risk insurance page covers it.
- Motor truck cargo: goods damaged while carried on the business’s own truck.
- Bailee’s customer: customers’ property in your care, the exposure of a dry cleaner, repair shop or warehouse.
- Accounts receivable and valuable papers: the money you cannot collect, or the records you must rebuild, after a fire destroys them.
Scheduled vs blanket inland marine limits
A scheduled policy lists each item with its own value, usually by make, model and serial number. Insureon says contractor’s equipment under $2,500 can be insured as miscellaneous tools and equipment, while items over $2,500 may need to be scheduled one by one, at a higher cost.
Blanket coverage works the other way round: one limit covers a whole class of unscheduled property, with no item listed by name. Blanket is easier to keep current when gear comes and goes, and scheduling gives certainty on expensive single items. A business can use both, scheduling the excavator and the drone and carrying a blanket amount for the rest. Whichever you choose, ask whether a per-item cap applies inside the blanket amount.
Three other terms change what a claim pays. Open perils forms cover every cause of loss the policy does not exclude, while named perils forms cover only the causes they list. Some forms carry a coinsurance clause that reduces a claim when values are set too low. And Insureon notes that actual cash value forms, which deduct depreciation, cost less than replacement cost forms.
What inland marine insurance costs
Published figures give a starting point, not a Mithril1 quote. Insureon’s May 2026 cost page puts the median for its small-business customers at $48 a month, with annual premiums ranging from around $150 to over $4,500 a year. Its sample of 100,000 small business owners is made up mostly of firms with fewer than five employees, so those numbers describe solo and very small operations at standard limits.
Price varies with the type of business. In the same data, retailers pay about $137 a month and cleaning businesses about $42 a month, so a retailer at the median pays $1,644 a year against $504 for a cleaning business, more than three times as much for the same line of coverage.
Your premium rises with expensive single pieces that must be scheduled, replacement cost valuation and a lower deductible. It falls with a higher deductible, actual cash value valuation and smaller items insured as miscellaneous tools and equipment. When you are ready, tell us what you need to cover; we request tools and equipment or builders risk quotes, and the insurer decides after reviewing the property list and your loss history.
A few useful answers
Common questions
What is inland marine insurance in plain terms?
Property insurance for business property that moves or stays somewhere other than your main address: tools on job sites, goods on your truck, installations in progress and customers’ property in your care.
Why is it called inland marine if nothing goes near water?
It grew out of ocean marine insurance, which covered goods in transit. The name stayed when the same kind of coverage was applied to property moving and working on land.
Doesn’t my commercial property policy already cover my equipment?
Only at the location the policy lists. Once the equipment leaves that address, inland marine is the coverage written for it.
Does inland marine insurance cover my work truck?
No. Vehicles need commercial auto. Inland marine can cover equipment mounted on the truck and cargo you carry on it.
Is builders risk a type of inland marine insurance?
Usually. IRMI says most builders risk policies are written on inland marine forms, and the marine definition lists installation and builders risks as a commercial floater class.
Can I get inland marine insurance through Mithril1?
You can, when an insurer accepts the property schedule, values and claims history you send. We help you build the list and request quotes for tools and equipment or builders risk coverage.