What is an excluded peril on most standard property forms that can be added by endorsement?

An excluded peril that can be added by endorsement on most standard property forms is earthquake. In standard property insurance policies, certain perils are typically excluded to limit the insurer's exposure to high-risk events. Earthquakes are often classified as high-risk and are excluded from standard coverage to help keep premiums at manageable levels.

By using an endorsement, a policyholder can purchase additional coverage specifically for earthquakes, allowing them to protect their property against this peril. This flexibility enables individuals and businesses located in seismic areas to obtain relevant coverage tailored to their specific needs.

Flood and theft are also commonly excluded but typically have more straightforward separate policies, while fire is usually included in standard property policies. Thus, earthquake stands out as a peril that frequently requires an endorsement for coverage.