COVERAGE DECISIONS
Foundation damage and homeowners insurance: settling, leaks and collapse
A homeowners policy does not insure a foundation against moving on its own. The standard form excludes settling, shrinking, bulging and expansion, including the resulting cracks, and it excludes earth movement of every kind. It does pay for foundation damage that a covered event causes, and for ensuing loss the exclusions do not preclude. Which side of that line a crack falls on depends on one fact: what moved first, the water, the soil or the structure.
Read this first. Quoted wording comes from the ISO Homeowners 3 Special Form HO 00 03 10 00 sample published by the Insurance Information Institute, edition 10 00, copyright 1999. Insurers use their own and later forms, and your policy controls. General information, not legal or insurance advice. Flood and earthquake insurance are separate from a homeowners policy.
Sort the cause, then find the clause
Foundation damage sounds like one problem and behaves like ten. A hairline crack, a sagging floor and a wall that has separated from the slab can come from a water line, drying clay, a tree, a bad grading job, a freeze, a truck or a sinkhole, and each has a different clause. The table lists the causes in the order claim files usually surface them, with the clause in the sample form that governs and the result the text points to. It is a map of the wording, not a prediction of any claim.
| What moved first | Clause that governs | What the text points to | Proof that moves it |
|---|---|---|---|
| Soil shrinks and swells; footing settles | Coverage A and B exclusion 2.c(6)(f): settling, shrinking, bulging or expansion, including resultant cracking of foundations | Excluded | Engineer's finding of the settling mechanism |
| Freeze-thaw or ice pressure against the foundation | Exclusion 2.c(2): freezing, thawing, pressure or weight of water or ice, to a footing, foundation or wall that supports a building | Excluded | Weather record and pattern of cracking |
| Sinkhole, subsidence, other earth sinking, rising or shifting | Section I exclusion A.2, earth movement | Excluded; direct loss by fire or explosion that follows is paid | Geotechnical report on the cause |
| Groundwater pressure pushing through the foundation | Section I exclusion A.3.c, water below the surface of the ground | Excluded; see the water guides | Water source and path |
| Bad grading, compaction, design or workmanship | Section I exclusion B.3; ensuing loss not precluded elsewhere is covered | Excluded as the cause; ensuing covered loss may be paid | Construction and grading records |
| Water line or appliance leaks, suddenly | Accidental discharge peril and tear-out; the system itself is not covered | Resulting water damage and tear-out covered; effect on the slab contested | Leak test, plumber's report, dated photos |
| Leak runs for weeks or months | Wear and tear, deterioration and related exclusions in 2.c(6), with an exception for resulting accidental discharge loss | Often disputed; see the burst-pipe guide | Water bills, moisture mapping |
| Covered event strikes: fire, vehicle, wind-driven impact | The named perils for Coverage A and B | Covered, subject to deductible and limits | Photos before and after, police or fire report |
| Building actually falls in | Additional Coverage 8, collapse | Covered only if one of six listed causes produced it | Occupancy status and cause evidence |
Read down the first column and notice how many of the entries describe the same crack. An engineer's report that says only "foundation movement" leaves the claim in the exclusions. A report that names the mechanism, and dates it, is the document that can move a claim between rows.
Three exclusions that end most foundation claims
The first is the settling clause. Item 2.c(6)(f) of the Coverage A and B exclusions says the policy does not insure loss caused by settling, shrinking, bulging or expansion, including resultant cracking, of bulkheads, pavements, patios, footings, foundations, walls, floors, roofs or ceilings. The word "resultant" matters: an owner cannot get around settling by pointing to the crack that follows it. The same item lists wear and tear, marring and deterioration; mechanical breakdown, latent defect and inherent vice; rust, corrosion and dry rot; and birds, vermin, rodents or insects. Those items often appear in the same denial letter, because foundation problems usually have a history.
The second is the freeze-thaw clause. Item 2.c(2) excludes loss caused by freezing, thawing, pressure or weight of water or ice, whether driven by wind or not, to a fence, pavement, patio or swimming pool, to a footing, foundation, bulkhead, wall or any other structure or device that supports all or part of a building, or to a retaining wall or bulkhead that does not support a building, or to a pier, wharf or dock. A frost-heaved footing falls here by name. It is one of the few clauses that names foundations as the thing damaged, and it is why a northern owner's claim for a cracked wall can fail even when the winter was unusually hard.
The third is earth movement. Section I exclusion A.2 defines it as earthquake, including land shock waves or tremors before, during or after a volcanic eruption; landslide, mudslide or mudflow; subsidence or sinkhole; or any other earth movement, including earth sinking, rising or shifting, caused by or resulting from human or animal forces or any act of nature. It applies whether or not the property is physically damaged, and it does not apply to theft. If direct loss by fire or explosion ensues, the policy pays only for that ensuing loss. The California Department of Insurance, in a February 2025 consumer fact sheet on post-wildfire mudflow, lists the same family of standard exclusions: flood, earth movement, earthquake, landslide or mudflow, settling, cracking, shrinking, subsidence or sinkhole, erosion, sinking, rising, shifting, expanding or contracting of earth. It also says that under the efficient proximate cause doctrine there may be coverage where a covered peril such as a wildfire was the efficient proximate cause of an excluded event, which is a California rule that other states do not necessarily follow. Our earthquake guide covers the separate policy for ground shaking.
Collapse is a narrow door
Many foundation problems tempt an owner to say the house is collapsing. The sample form's Additional Coverage 8 sets a test that most foundation problems cannot meet. Collapse means an abrupt falling down or caving in of a building or any part of a building, with the result that the building or part cannot be occupied for its current intended purpose. A building or part in danger of falling down or caving in is not considered to be in a state of collapse. A standing part is not collapsed even if it has separated from another part. And a standing building or part is not collapsed even if it shows evidence of cracking, bulging, sagging, bending, leaning, settling, shrinkage or expansion.
Even a true collapse must come from a listed cause. The form insures direct physical loss involving collapse if it was caused by one or more of: the perils insured against named under Coverage C; decay hidden from view, unless an insured knew of it before the collapse; insect or vermin damage hidden from view, with the same exception; the weight of contents, equipment, animals or people; the weight of rain collecting on a roof; or the use of defective material or methods in construction, remodeling or renovation if the collapse occurs during the work. And item c adds that loss to an awning, fence, patio, deck, pavement, swimming pool, underground pipe, flue, drain, cesspool, septic tank, foundation, retaining wall, bulkhead, pier, wharf or dock is not included under causes two through six unless it is a direct result of the collapse of a building or part of a building. Taken together, the clause pays for a house that has fallen in because of hidden rot, and it does not pay for a foundation that is sinking. The same item c leaves a buried septic tank only the Coverage C perils, such as a vehicle, as a route to collapse coverage; our septic system guide follows that through to the claim. The insect cause works the same way; our termite damage guide covers what known damage does to it and how courts have treated floors that sagged rather than fell.
The slab leak and the endorsement that answers it
The slab leak is where the base form is least helpful. A supply line under the slab fails. Water erodes the soil, and the slab cracks or heaves. The accidental discharge peril covers the discharge and the tear-out needed to repair the line, excludes loss to the system itself, and the form says that under items 2.b and c, any ensuing loss to property described in Coverages A and B that is not precluded by another provision is covered. The settling item says resultant cracking of foundations is excluded. Both sentences are in the same form, and the answer to whose sentence wins depends on facts and, in a dispute, on how the state's courts read them. That uncertainty is why Texas's consumer guide, TDI publication cb025 as updated June 1, 2026, lists damage to foundations or slabs among the common endorsements that companies offer to add coverage, next to sewer backup and building-code upgrades.
A TDI order from 2003, which approved a set of endorsements filed by one insurer, shows what such an endorsement can look like. Its description of a slab or foundation endorsement says it provides coverage up to $15,000 for damage to the slab or foundation of the building if the damage is caused directly by accidental discharge or leakage of water or steam, including constant or repeated seepage over a period of weeks, months or years, from within a plumbing, heating, air conditioning or fire protective sprinkler system or a household appliance. The tear-out provision gives two options: the cost of tearing out and replacing the part of the building needed to repair or replace the system, or the cost to reroute it, and tear-out costs count inside the $15,000 limit. We cite it as an example of what endorsement wording can do, not as any current product, any insurer's current terms or a typical limit, and the order's own description is older than the form edition above.
What to take from it is the list of questions to put to an agent: Is there a slab or foundation endorsement available to us? Does the limit include tear-out? Does it cover continuous seepage over time, which the base form's exclusions would otherwise reach? Does it cover foundation damage from a leak of any kind, or only from the plumbing? If the answer to the first question is no, the foundation's exposure is yours.
Florida writes the sinkhole definitions into statute
One state turns the earth-movement exclusion into a set of defined terms, and the definitions are the best available picture of how much proof a ground-movement claim needs. Under Florida Statutes section 627.706, every insurer authorized to write property insurance in the state must provide coverage for a catastrophic ground cover collapse, and must make sinkhole loss coverage available for an additional premium, to the extent provided in the form to which it attaches. The insurer may require an inspection before issuing sinkhole coverage, may restrict the coverage to the principal building, and may apply a sinkhole deductible of 1, 2, 5 or 10 percent of the policy dwelling limits with premium discounts for each. A policy that excludes sinkhole loss must carry a bold statement of at least 14 points that its coverage is limited to a catastrophic ground cover collapse that leaves the property condemned and uninhabitable.
The mandatory coverage is narrow by definition. A "catastrophic ground cover collapse" is geological activity with four results together: an abrupt collapse of the ground cover; a depression in the ground cover clearly visible to the naked eye; structural damage to the covered building, including the foundation; and the structure being condemned and ordered vacated by the governmental agency authorized to issue the order. The statute adds that damage consisting merely of settling or cracking of a foundation, structure or building is not a loss from a catastrophic ground cover collapse. The optional coverage turns on "sinkhole activity", defined as settlement or systematic weakening of the earth supporting the covered building only if it results from contemporaneous movement or raveling of soils, sediments or rock into subterranean voids created by the effect of water on limestone or similar rock. A "sinkhole loss" is structural damage to the covered building, including the foundation, caused by sinkhole activity, and contents and additional living expense coverage apply only if there is such structural damage.
"Structural damage" is where the definition becomes technical. It requires one of five conditions: interior floor displacement or deflection beyond acceptable variances in ACI 117-90 or the Florida Building Code that makes the interior structure unfit for service or a safety hazard; foundation displacement or deflection beyond ACI 318-95 or code variances that damages primary structural members so that the stresses exceed one and one-third of the nominal strength allowed for new buildings; listing, leaning or buckling of exterior load-bearing walls so far that a plumb line through the center of gravity falls outside the middle third of the base; damage making the building significantly likely to collapse imminently because of ground movement; or, for damage on or after October 15, 2005, damage that qualifies as substantial structural damage under the Florida Building Code. A hairline crack is none of these. An owner in the state who suspects ground movement should therefore ask the engineer a different question from the one asked in other states: not whether the house has moved, but whether the movement meets the statute's measured thresholds. The statute also sets up a neutral evaluation process run by an engineer or geologist with sinkhole expertise, defined in the same section.
We read only section 627.706, not the companion sections on claim investigation and the neutral evaluation procedure, so this page does not describe their deadlines. No other state's statute was read for this topic, and the comparison to Florida is not an assertion that another state's policy forms are the same.
A worked claim, three outcomes
Consider a made-up repair. A $300,000 house with a slab foundation needs a repair that an engineer prices at $28,000: stabilizing piers, regrading and cosmetic repair. The policy has a $2,500 deductible. The same $28,000 estimate lands in three different places depending on the engineer's cause finding.
| Engineer's finding | What the clauses say | Insurer pays | Owner pays |
|---|---|---|---|
| Seasonal clay movement under a corner footing, cracks over six years | Settling and resultant cracking excluded (2.c(6)(f)); wear and deterioration also cited | $0 | $28,000 |
| A vehicle left the road and struck the foundation wall; crack pattern and tire marks at one point | Direct physical loss from a covered peril; Coverage A open perils; foundation exclusions do not name the cause | $25,500 if the full estimate is accepted (estimate less the $2,500 deductible) | $2,500 |
| Supply line burst under the slab; slab heaved; plumber's test confirms a sudden break | Accidental discharge and tear-out covered; the line itself excluded; slab damage contested against the settling and ensuing-loss language; an endorsement, if bought, would answer it | Depends on the endorsement. With a $15,000 slab endorsement that includes tear-out and a $2,500 deductible, up to $12,500, subject to its terms | The balance of $28,000 |
The third row is the one that surprises people, because the arithmetic of the endorsement's limit interacts with the deductible and the tear-out. The $12,500 is shown to demonstrate the mechanics (limit less deductible), not to report an actual product. When a pipe is the cause, the plumber's and the engineer's findings are separate documents, and the claim goes better when both exist and agree.
When the foundation is covered, how the repair is paid
A covered foundation loss is a Coverage A building loss, and the Loss Settlement condition in the sample form sets how it is paid. On a policy whose building limit is at least 80 percent of the full replacement cost of the building immediately before the loss, the insurer pays the cost to repair or replace, after the deductible and without deduction for depreciation, but no more than the least of the building limit, the replacement cost of the damaged part with material of like kind and quality and for like use, or the necessary amount actually spent. If the limit is under 80 percent, the payment is the greater of actual cash value of the damaged part or a proportion of the repair cost equal to the limit divided by 80 percent of replacement cost. A foundation job therefore pays on what the repair actually and necessarily costs, which is another reason to keep the contractor's invoice.
One sentence in that condition is specific to foundations. In working out whether the limit reaches 80 percent of replacement cost, the form says not to include the value of excavations, footings, foundations, piers or any other structures or devices that support all or part of the building and are below the undersurface of the lowest basement floor. The below-grade structure is left out of the test. It does not mean the below-grade structure is excluded from the loss, but it does mean that a limit set from a rebuilding estimate that includes the footings may have a margin the form does not require. Our sizing guide shows how to set the limit, and the replacement cost options guide explains the settlement terms that sit above it.
A couple of edges are left. Increased cost to comply with building codes is not part of the repair cost in this condition except to the extent that Ordinance or Law coverage provides it, and engineered pier or underpinning work is exactly the kind of repair a code official may specify; the ordinance or law guide covers that limit. And if the insurer and owner agree on cause but not on price, the Appraisal condition, which the form frames as a process for a failure to agree on the amount of loss, lets either side demand appraisal, with each party choosing an appraiser within 20 days and the two choosing an umpire. A dispute about cause is a coverage dispute, and the route for it is the appeal and complaint process, not appraisal.
Evidence that moves a foundation claim
Insurers decide these claims on causation, and the owner's file is usually the weaker half. A short list covers most of it.
| Document | What it can show | Clause it bears on |
|---|---|---|
| Engineer's report naming the mechanism | Settling, heave, leak, impact or collapse, with a date range | All of them |
| Plumber's pressure or leak test, with invoice | Whether a line failed suddenly or leaked for a long time | Accidental discharge versus deterioration |
| Water bills for two years | A change in use that dates a leak | Sudden versus gradual |
| Dated photographs of cracks with a scale | How fast a crack moved | Settling versus a single event |
| Pre-purchase inspection and seller disclosure | Whether the damage existed before the policy period | Policy period; concealment condition |
| Grading and drainage records, permits for additions | Whether workmanship or grading is the cause | Exclusion B.3 and its ensuing-loss sentence |
| Weather and frost-depth records | Freeze-thaw as cause | Exclusion 2.c(2) |
The sample form's duties-after-loss condition asks for prompt notice to the insurer, protection of the property from further damage, an inventory, and on request records and documents that support the claim. It also says the insurer has no duty to provide coverage if failure to comply with the duties is prejudicial to it. In practice this means two things for a foundation claim: tell the insurer before a contractor starts breaking concrete, and do not remove evidence that an engineer would want to see.
Before you sign a foundation repair contract
Put the order of operations in writing, because contractors sell foundation work in a hurry and insurers decide it slowly. Report the damage in writing and keep the date. If water is involved, stop the source and keep the failed part. Commission a cause-of-damage opinion before a repair estimate, since an estimate does not address cause. Ask the insurer to inspect before work begins, and keep the contractor's photographs. And read the denial, if one comes, against the exact exclusion it cites; our guide to appealing a denial shows how to answer it, and the burst pipe guide works through the water sections of the same form.
Foundation claim FAQ
Does homeowners insurance cover a cracked foundation?
Usually not when the crack is the result of the soil or the concrete moving on its own. In the ISO HO-3 sample form, the Coverage A and B exclusions list settling, shrinking, bulging or expansion, including resultant cracking of foundations, among the losses it does not insure. A crack caused by a covered event, such as a vehicle striking the house or a fire, is a different loss, because the policy covers direct physical loss from a covered cause. What the engineer finds as the cause decides which of those two situations you are in.
Is a slab leak covered?
The water damage that escapes may be covered, the pipe itself is not, and damage to the slab is the contested part. The sample form covers accidental discharge from a plumbing system and the tear-out needed to repair it, excludes loss to the system itself, and carries an ensuing-loss sentence for the foundation exclusions. Texas's consumer guide lists damage to foundations or slabs as an endorsement many companies offer, which tells you the base form is not expected to answer the question. Ask for the endorsement wording, not a general answer.
What does collapse mean in a homeowners policy?
In the sample form it is an abrupt falling down or caving in of a building or part of a building with the result that it cannot be occupied for its current intended purpose. A building in danger of falling down is not in a state of collapse, a standing part is not collapsed even if separated from another part, and a building that shows cracking, bulging, sagging, bending, leaning, settling, shrinkage or expansion is not collapsed either. The additional coverage applies only if the collapse was caused by one of six listed causes, and it does not extend to foundations, retaining walls and similar structures unless the loss is a direct result of the collapse of a building.
Does a sinkhole count as covered?
Under the standard earth-movement exclusion, subsidence or sinkhole is listed as excluded earth movement, and so is any other earth sinking, rising or shifting, whether caused by human or animal forces or any act of nature. The exclusion carries an exception: if direct loss by fire or explosion follows, the policy pays for that ensuing loss. Some insurers handle sinkhole separately through endorsements, so the answer for a particular house depends on the policy and the state.
Will the insurer pay for an engineer's report?
We did not find a coverage for the cost of an owner's own engineer in the sample form. The policyholder is the party who has to supply support for a claim, and the form's duties-after-loss condition asks for records and, on request, documents that support the claim. Whether the insurer retains its own engineer is the insurer's decision, so some owners commission their own report first and send it with the notice. Keep the invoice either way, in case the policy or the dispute process ever treats it as part of the cost of the claim.
What if the foundation problem was there when I bought the house?
Then the claim is about when the damage began, not when you noticed it. The policy period in the sample form says the policy applies only to loss which occurs during the policy period, and the concealment-or-fraud condition applies if an insured misrepresents a material fact. A pre-purchase inspection report, the seller's disclosure and any earlier repair invoices are the documents that fix the date, and they work in both directions.
Sources and verification
All checked October 23, 2026. Insurance Information Institute, ISO HO 00 03 10 00 sample form (Coverage A and B exclusions 2.c(2) and 2.c(6); Additional Coverage 8, collapse; Section I exclusions A.2, A.3 and B.3; Section I conditions B). California Department of Insurance, consumer fact sheet on flood, mudflow and similar events after a wildfire (February 2025). Texas Department of Insurance, Home insurance guide cb025 (updated June 1, 2026), and Order CO-03-0110 (2003). Fla. Stat. 627.706 (2026 Florida Statutes). Dollar figures in the worked table are invented illustrations.
Most foundation denials turn on whether the loss was sudden, so how water claims are decided is the page to read next if a leak is in your engineer's report.