Most homeowners know that earthquakes are excluded from a standard policy. Fewer realize that the exclusion doing that work is broader than earthquakes and captures a whole family of ground-related losses, several of which are far more common than a quake in most of the country.
What the exclusion covers
The earth movement exclusion in standard HO-3 forms is written expansively. It typically encompasses:
- Earthquake, including aftershocks and land shock waves
- Landslide, mudslide and mudflow
- Subsidence, meaning the sinking of land
- Sinkholes and the collapse of underground cavities
- Earth sinking, rising or shifting generally
- Settling, cracking, shrinking, bulging or expansion of foundations, floors and walls
The last item is the one that catches ordinary homeowners with no geological drama in sight. Foundation cracks and settling on expansive clay soils are excluded as a routine matter, and they are one of the most common uncovered property problems in the country.
Some forms provide an exception for ensuing fire or explosion: if earth movement causes a fire, the fire damage may be covered even though the movement itself is not. That is a narrow carve-out, not a general rescue.
Why it is excluded
The reasoning is the same for all catastrophe perils that insurers separate out. Earth movement losses tend to be geographically concentrated, severe, and correlated, meaning many policyholders in an area suffer at once. They are also difficult to distinguish from gradual deterioration and from construction defects, which are excluded for different reasons. Pricing them inside a general policy would spread a highly localized cost across everybody.
Flood and earthquake are excluded on the same logic and handled the same way, through separate coverage.
Buying the coverage back
Earthquake is available as a separate policy or an endorsement in most states, usually with a percentage deductible calculated on Coverage A rather than a flat amount. Some states have residual market mechanisms for it. Covered in earthquake insurance explained.
Landslide and mudflow are harder. Mudflow specifically is generally treated as a flood peril and may be covered by a flood policy rather than by earthquake coverage, while a dry landslide is typically neither. Difference-in-conditions policies in the surplus lines market are the usual route where standard coverage does not exist. See admitted versus surplus lines carriers.
Sinkhole coverage varies by state, and one state has built an entire framework around it.
Florida's two-tier approach
Florida separates the peril into two distinct coverages, and the distinction is precise.
Catastrophic ground cover collapse must be provided by every insurer writing property coverage in the state. It is defined narrowly and requires a set of conditions to be met together, including that the structure has been condemned and ordered vacated by the authority with power to do so. The statute states expressly that settling or cracking of a foundation, structure or building on its own does not qualify.
Sinkhole loss coverage is broader. It covers structural damage to the building, including the foundation, caused by sinkhole activity, without requiring condemnation. Insurers must make it available for an additional premium, and may require an inspection of the property before issuing it. Policies may carry a sinkhole deductible expressed as a percentage of the dwelling limit, with several percentage options offered.
Insurers issuing policies that exclude sinkhole loss coverage are required to notify policyholders prominently that the policy covers catastrophic ground cover collapse and does not otherwise cover sinkhole losses.
The practical reading for a Florida homeowner: the mandatory coverage is real but very narrow, and it is not the same thing as sinkhole coverage. If the house is damaged but still standing and habitable, catastrophic ground cover collapse generally does not respond.
Other states with karst geology, mining subsidence or expansive soils have their own arrangements, and several operate mine subsidence programs. Statutes change. Confirm the current position with your state's Department of Insurance rather than relying on a summary.
Telling ordinary settling from a real problem
Not every crack is a claim, and most are not.
| Often ordinary | Worth professional assessment |
|---|---|
| Fine hairline cracks in drywall at corners | Cracks wider than a quarter inch, or widening over time |
| Small vertical cracks in a foundation wall | Stair-step cracking through masonry |
| Nail pops and minor trim separation | Doors and windows that stop closing |
| Cracks stable over years | Floors visibly sloping, or a chimney separating from the wall |
| Cracks appearing in a new build's first year | Circular depressions in the yard, or a sudden new one |
If the pattern is concerning, the right professional is a structural engineer or a geotechnical engineer, not a contractor offering a free assessment and a repair contract in the same visit. An engineer's report is also the document that carries weight if there is a claim.
What is not the earth movement exclusion
Two common problems are excluded for different reasons and are sometimes misattributed here.
Water seeping through a foundation is a water exclusion issue rather than an earth movement one. See water damage: what a home policy covers and water backup coverage.
Construction defects are excluded as faulty workmanship, design or materials. That is a claim against a builder, a warranty, or nobody, depending on the age of the home and state law.
If you are buying
Ground conditions are a due diligence question, not an insurance question, and the time to ask is before closing.
- Ask whether the area has a history of sinkholes, mining subsidence, landslide or expansive soils. State geological surveys publish this.
- Ask the seller directly about foundation repairs and prior claims. Prior claims also show up in claims history reports.
- Consider a structural or geotechnical opinion where the standard inspection raises anything.
- Ask an agent early what coverage is available for the specific property, since an insurer may decline or require inspection. The sequence is laid out in buying your first home: the insurance timeline.
A prior sinkhole claim or repair on a property affects both insurability and resale, and it is the kind of thing that is far cheaper to discover during the inspection period than after.
What the earth movement exclusion covers, whether sinkhole or earthquake coverage is available, what a state mandates, what deductible applies and what disclosures are required all vary by insurer, by policy form and by state, and the policy documents and state law control. For your own situation, speak with a licensed agent or your state's Department of Insurance. You can also request home insurance quotes and get connected with licensed providers in your area.