What is the difference between umbrella and excess liability insurance?
An umbrella policy provides broader coverage and may cover claims excluded by underlying policies, while excess liability simply extends the limits of the underlying policy without broadening coverage.
Umbrella and excess liability policies both provide additional liability limits above the underlying insurance, but they differ in important ways that affect the scope of protection.
A commercial umbrella policy provides coverage above the underlying liability policies (general liability, auto liability, employer's liability) and may also provide broader coverage than the underlying policies. This means an umbrella policy might cover certain claims that the underlying policies exclude, subject to a self-insured retention (SIR). The umbrella acts as both an extension of limits and a potential gap-filler. There is no single standardized ISO umbrella form; most umbrella policies are written on proprietary insurer forms, which means terms and breadth of coverage vary significantly between carriers.
An excess liability policy, by contrast, follows the exact terms and conditions of the underlying policy. It simply extends the dollar limits without broadening the coverage scope. If the underlying general liability policy excludes a particular type of claim, the excess policy excludes it as well. Excess policies are often described as "following form" because they adopt the same coverage grants and exclusions as the underlying policy.
For apartment owners, the practical difference matters most when a claim falls outside the scope of the underlying policy. An umbrella might provide coverage (subject to the SIR), while an excess policy would not. However, excess policies can be less expensive because they take on less risk. The choice between umbrella and excess depends on the owner's risk profile, the scope of the underlying coverage, and the available market options.