Storage insurance means two different things depending on which side of the door you are on. An operator insures a building full of other people's property; a business storing goods insures property it cannot see.
The operator's position
A self storage operator insures the building, its own equipment and its liability as occupier, and its trading conditions almost always say that goods are stored at the customer's risk. That is the whole commercial design: the operator does not insure the contents, and customers are required to insure their own or to buy cover offered alongside the unit. Where an operator handles, moves or packs goods, that changes the position and brings the goods into their custody.
The customer's position
A business storing stock, records, equipment or seasonal goods away from its own premises is usually outside its main policy, which is written to the address on the schedule. Goods in storage need naming, at the right value, with the operator's site conditions in mind. Insurers ask about the building, its security and whether the unit is sprinklered, and some will not write certain goods, particularly anything flammable or high value, in a shared facility.
What the trading conditions actually do
Storage contracts limit the operator's liability sharply, frequently by weight or to a modest cap per unit, and exclude consequential loss. A customer reading those conditions before a loss understands that a claim against the operator will not replace the goods even where the operator was at fault. That limitation is exactly why the customer's own cover, or the cover sold with the unit, is the practical answer rather than a fallback.
The risks a unit actually carries
Water ingress, damp and condensation damaging paper, textiles and electronics; pest damage; fire spreading between units; and theft, usually of a unit rather than a building. Deterioration through damp is the loss customers least expect and is often excluded or conditioned, particularly for goods stored long term. Anybody storing documents, stock or equipment for months should read the wording on gradual causes rather than assume a theft and fire policy covers the likely loss.
Questions people ask about storage insurance
Does a storage operator insure my goods?
Normally not. Trading conditions usually state that goods are stored at the customer's risk and limit the operator's liability sharply.
Is stock in storage covered by my business policy?
Only if it names the storage location. A commercial policy is written to the address on the schedule and does not follow goods to a third party facility.
Is damp damage covered?
Often excluded or conditioned, particularly for long term storage. Gradual causes such as damp and condensation are the losses customers least expect.