What Is Not Covered Under an HO3 Home Insurance Policy?
Flood, earthquake, and routine wear are excluded, along with sewer backup and mold unless you add them back as endorsements.
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Flood and earthquake
An HO3 excludes both outright, no matter the cause of the water or ground movement. If your non-renewal mentions a flood zone change or your area's earthquake risk, you need separate policies for those, not an endorsement on this one.
Wear and neglect
An old roof or outdated wiring that led to your letter isn't something the policy would have covered anyway. Gradual damage from age, deferred maintenance, or ignored small leaks falls under wear and tear, which every HO3 excludes regardless of insurer.
Sewer backup and mold
These are excluded by default but can usually be added back as endorsements, often for a modest cost. If a past claim for either is part of why you were dropped, ask any new insurer directly whether they'll offer the endorsement or exclude it going forward.
What this means for replacement
A new insurer will underwrite your house again, checking the same roof age and wiring that triggered your non-renewal. Knowing what an HO3 never covers helps you see whether your letter was about an exclusion or about risk the insurer chose not to take on.
Since the exclusions are the same everywhere, what separates one HO3 policy from another is the underwriting behind it, and insurers weigh an aging roof or old wiring differently. One company's non-renewal doesn't mean every insurer sees your house the same way. Comparing quotes now shows which ones will still write the coverage you need, and at what cost, before your current policy ends.
What else does an HO3 leave out
Beyond flood, earthquake, and wear, an HO3 excludes a handful of other things worth knowing before you sign a new policy. Damage from termites and other pests is excluded, since it's treated as preventable with regular upkeep, not something sudden or accidental. The same goes for rust, rot, and corrosion that build up over time rather than happen in a single event.
Acts of war and nuclear hazard are excluded, though these rarely come up in an actual claim. More relevant to most homeowners is the exclusion for intentional damage. If you caused the loss on purpose, there's no coverage for it, and insurers investigate claims that look staged or exaggerated with that exclusion in mind.
Earth movement is excluded beyond just earthquakes. Sinkholes, landslides, and settling or shifting soil fall under the same exclusion, so if your house sits on ground that's prone to any of those, you'd need a separate policy or endorsement to cover it, similar to how flood and earthquake work. Ordinance or law is another one worth checking. If your house is damaged and local building codes require upgrades during the rebuild, a standard HO3 doesn't pay for the extra cost of meeting current code. That's usually available as an endorsement, and it matters more for older houses that were built under rules that have since changed.
Power failure is excluded too, but only when the failure happens off your property. If a transformer down the street fails and your food spoils or your pipes freeze, that's not covered, even though the same damage from a failure inside your house might be. None of these exclusions are unusual or specific to any one insurer. They're standard across the HO3 form, so a new policy will carry the same limits. What changes from one insurer to the next is willingness to write the policy at all, and what it costs once they've looked at your house.
What about personal belongings and liability limits
An HO3 covers your house on an open-perils basis, meaning it covers everything except what's specifically excluded. Personal belongings work differently. They're covered only for a named list of perils, like fire, theft, and windstorm, even though the house itself is covered more broadly. That gap catches people off guard. If something damages your belongings in a way that isn't on that list, there's no coverage for the contents even if the house itself would be covered for the same event.
Certain belongings also carry built-in dollar limits regardless of how much coverage you bought overall. Jewelry, firearms, cash, and business equipment kept at home are the common ones. A typical policy might cap jewelry theft at a couple thousand dollars unless you've scheduled specific items separately. If you have anything valuable in these categories, check your declarations page for the sublimits, not just the total personal property coverage number.
Liability has its own exclusions worth knowing, especially if your non-renewal involved a dog breed or a pool. Intentional injury you cause isn't covered, and neither is liability arising from running a business out of the house, which needs its own policy. Some insurers also exclude or limit liability for certain dog breeds or for pools and trampolines, which may be part of why your previous policy was dropped or made more expensive. A new insurer may ask about these directly during underwriting.
None of this changes what the house itself is covered for, but it matters when you're comparing replacement policies. Two HO3 policies can have identical exclusions for the dwelling and still differ widely in how they cover belongings, what they cap, and how they treat liability for things like dogs or home business equipment. Asking about these specifics now, rather than after a claim, is the only way to know what you're actually buying.
Before you pick a replacement policy
Pull your old declarations page and check the sublimits on jewelry, the endorsements you had for sewer backup or mold, and the deadline in your letter. Compare those same lines against any new quote.
