Summary: There are three alternatives insureds may select from when arranging the scope of coverage desired under ISO's commercial property program. A policy written under the simplified language commercial property program of Insurance Services Office must incorporate one of three alternative causes of loss forms—basic form CP 10 10 10 12, broad form CP 10 20 10 12, or special form CP 10 30 10 12—which are differentiated by the scope of covered perils (referred to in the forms as causes of loss rather than perils) each provides. A fourth cause of loss form, CP 10 40 10 12, provides earthquake coverage for insureds who choose to add it to their policies. A number of optional causes of loss endorsements are also available to modify the terms of the policy.

The basic form includes eleven causes of loss that are insured under the policy. The broad form includes the same eleven, plus three additional causes of loss and additional coverages applicable to collapse and fungus, wet and dry rot, and bacteria. The special form is the broadest cause of loss form. It covers all causes of loss except those that are excluded or limited.

This discussion reviews the causes of loss forms. The most recent edition of these forms is dated October 2012.