The exclusions section of a homeowners policy is the part people read after something has happened, which is the worst possible time. Read in advance, it is more interesting than it sounds, because nearly every exclusion is there for a structural reason rather than out of stinginess, and knowing the reason tells you whether the gap can be filled and how.
Seven common ones. Policies vary by insurer and by state, so treat this as a guide to the conversation rather than as a description of your own document.
1. Flood
The largest and most consequential exclusion in American property insurance, and the one most homeowners are genuinely surprised by. Damage from surface water rising and entering the building is not covered by a standard policy.
The reason is that flood does not behave like the risks insurance is built on. Ordinary insurance works because losses are scattered: a fire here, a burst pipe there, funded by everyone's premiums. Flood arrives all at once across an entire region, so every policyholder in the pool claims in the same week. Private markets struggled with that, which is why flood coverage in the United States is handled largely through a separate federal program with private participation. Whether you can buy it at all, and what it costs, comes down to where your address sits on the FEMA flood map for your community.
Worth knowing that flood claims are common outside mapped high risk areas, and that a policy is available in most participating communities regardless of zone.
2. Earth movement
Earthquake, landslide, sinkhole, and settling are excluded for the same reason as flood. The losses correlate geographically and arrive together.
Earthquake coverage is generally purchased separately or added by endorsement, and in some states it is offered through a state backed arrangement. Sinkhole coverage varies enormously and is a specific conversation in the regions where it matters. Settling of a foundation over time is a different exclusion with a different reason, covered below.
3. Wear, tear, and maintenance
The broadest exclusion and the one that generates the most disagreement at claim time. Deterioration, rot, rust, and mechanical breakdown from age are not covered.
The reason is that insurance covers sudden and accidental events, not the predictable decline of a building. A roof that reaches the end of its life is a maintenance expense that was always going to arrive. If policies covered it, the premium would simply be the cost of replacing everyone's roof spread over the years, plus administration, which is a worse deal than saving for it yourself.
The practical consequence is that the line between a storm damaged roof and a worn out roof is where most residential claims are actually decided, and documented maintenance is what puts you on the right side of it.
4. Mold
Usually excluded or sharply limited, with an important carve out: mold that results directly from a covered event, such as water from a burst pipe, is often addressed, while mold arising from ongoing dampness is not.
The reason is the same maintenance principle. Mold is a consequence of moisture that persisted, and persistent moisture is a condition rather than an event. This is why the speed of drying after any water intrusion matters so much to a claim, and why the moisture readings a restoration crew logs are worth keeping.
5. Sewer and drain backup
Water backing up through a floor drain or a fixture is typically excluded from the base policy, which surprises people because it feels like ordinary plumbing trouble.
The reason is partly that the cause is often outside the property, in a municipal system, and partly that the risk is heavily concentrated in particular neighborhoods and particular storms. The good news is that this is one of the easiest gaps to close: an endorsement adding backup coverage is widely available and usually inexpensive relative to what it covers. Anyone with a finished basement should be asking about it by name.
6. Vacancy
Most policies restrict or suspend certain coverage once a dwelling has been unoccupied beyond a stated period, commonly measured in weeks.
The reason is that empty buildings behave differently. Nobody notices the leak, nobody hears the alarm, and vandalism risk rises. This one catches people during a renovation, after inheriting a property, or when a house sits on the market. It is entirely manageable by telling your insurer and moving to a policy written for the situation, and the failure is almost always a failure to mention it.
7. Business use of the home
Property used for a business and liability arising from business activity are generally excluded or severely limited on a personal policy.
The reason is that the personal policy was priced for a household. A homeowner who now has customers arriving, inventory in the garage, and employees on the property has changed the risk substantially. The fix is straightforward and inexpensive at the small end: an endorsement for incidental business use, or a small commercial policy once the operation is real.
What to do with the list
Read your own declarations page and the exclusions with three questions in mind. Which of these could actually happen here, given the geography and the building. Which of them can be bought back, and at what cost. And which of them are really telling me to maintain something rather than to buy something.
Most households find one or two genuine gaps and can close them for a modest amount at the next renewal. That is a good outcome from an hour of reading, and it is a far better time to discover it than in the week after.
One general point worth carrying away. An exclusion is not the insurer declining to help. It is a statement that this particular risk does not fit inside a pooled product priced for households, which usually means it is available somewhere else, on different terms, from a program built for it. Almost every item on this list has a route to coverage attached, and the households that get caught are the ones who assumed the standard policy was the only product that existed.