Collapse coverage: what counts as a collapse

Under the standard ISO HO-3, a collapse 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 intended purpose. The policy pays only when one of six listed causes produced it, such as fire, wind, hidden rot or the weight of people. A floor that drops into the crawlspace overnight because of decay nobody could see is the textbook covered collapse. A foundation that cracks, a wall that bows or a beam that sags over years is not, even if the house is clearly failing.

This guide describes the form HO 00 03 05 11. Your insurer's form may use different words, and as explained below, the words decide these claims.

What the form says

Collapse is an Additional Coverage in Section I, item E.8, not part of the open-perils coverage on the dwelling. The perils section of the HO-3 expressly removes collapse from Coverages A and B and sends it to E.8, so the Additional Coverage is the only door in. It applies only to an "abrupt collapse," and it spells out what is not one:

• A building or part of a building that is in danger of falling down or caving in.
• A part of a building that is still standing, even if it has separated from another part.
• A building or part that is standing but shows cracking, bulging, sagging, bending, leaning, settling, shrinkage or expansion.

Then it limits the causes. The insurer pays for direct physical loss to covered property involving an abrupt collapse only if one or more of these produced it:

Snow deserves a note. The Coverage C list includes "weight of ice, snow or sleet," but the peril is worded as damage to property contained in a building. How that wording applies to the roof structure itself is something to check in your own policy, so ask your agent how your insurer treats snow-load roof failures.

Structures that get less protection

The form carves out a list of items: an awning, fence, patio, deck, pavement, swimming pool, underground pipe, flue, drain, cesspool, septic tank, foundation, retaining wall, bulkhead, pier, wharf or dock. A loss to any of them from hidden decay, hidden insects, the weight of people or contents, rain or construction defects is not covered, unless it is a direct result of the collapse of a building or part of one.

That is why a deck that gives way under a crowded party is usually not a collapse claim, even though "weight of people" is on the list. The deck is on the carve-out list, so the cause does not help it. The injured guests are a separate matter and run to your liability coverage; see Personal liability coverage (Coverage E) explained and Medical payments to others (Coverage F) explained. A retaining wall that fails from hidden rot or water pressure is also outside this coverage, and a foundation that deteriorates on its own is outside this coverage and is usually excluded as wear and tear or settling. foundation cracks and settling: what's covered covers the cracking side of that line.

Why "abrupt" is the fight

Older ISO forms did not define collapse. The 1991 edition of the HO-3 (HO 00 03 04 91) covered "collapse of a building or any part of a building" caused only by the listed causes and said only that collapse "does not include settling, cracking, shrinking, bulging or expansion." The October 2000 edition added the definition that the 2011 edition keeps: abrupt falling down or caving in, plus the rules that a building in danger of falling, or standing parts, are not in a state of collapse. The definition matters because courts had read the undefined word in different ways.

Courts have taken three positions on undefined "collapse" language: it means actual collapse, imminent collapse, or substantial impairment of structural integrity. The best-known recent example is the Connecticut crumbling-foundation litigation, where concrete containing the mineral pyrrhotite cracks and crumbles over time. In Karas v. Liberty Insurance Corp., 335 Conn. 62, decided November 12, 2019, the Connecticut Supreme Court applied a "substantial impairment of structural integrity" test to a policy that did not define collapse, and held that a house still standing must be shown to be in imminent danger of falling down or caving in. Insurance Journal reported that the court sided with the insurers in three decisions because the homes were not in imminent danger. If you live in Connecticut or any state where a crumbling foundation is an issue, that is a reason to read your policy's exact collapse wording and consult a coverage attorney. The point for most readers is simpler: the policy's wording, not the common meaning of the word, sets the test. A form with the ISO "abrupt" definition leaves much less room for argument than an undefined one.

Hidden versus known

"Hidden from view" and "known to an insured prior to collapse" do most of the work in decay and insect claims, and they are where adjusters spend their time. Expect to be asked for:

• The pre-purchase home inspection report and any later inspections, appraisals or four-point reports, to see whether anyone flagged soft wood, termite activity or moisture.
• Contractor and plumber invoices for work near the failed area.
• Photos of the area before the collapse.
• The failed framing itself.

Say a joist under a bathroom has been rotting for years where no one can see it, and one morning the tub drops into the crawlspace. If nothing in your records pointed to the decay, hidden decay is a listed cause and the collapse of that part of the floor can be covered, subject to your deductible (this is a hypothetical). Now change one fact: the floor had been visibly soft for a year, and a plumber had told you about the rot. The decay is no longer hidden or unknown, and the same fall is likely a denied claim. The same floor and the same drop produce a different result.

Because a building that is merely in danger of collapse is not covered, shoring up a sagging beam before it falls is normally your cost. Once a covered abrupt collapse has happened, protecting what remains falls under reasonable repairs. See reasonable repairs: what you can fix before the adjuster comes for what the insurer expects.

How it pays

The Collapse coverage does not increase the limit that applies to the damaged property. A collapsed roof is paid out of the Coverage A limit, collapsed outbuildings are paid under Coverage B, and belongings crushed in the collapse run through Coverage C, with its own settlement terms. Related costs follow the usual provisions:

• If the building code now requires more than a like-for-like rebuild, the Ordinance or Law additional coverage of 10% of the Coverage A limit may help. ordinance or law coverage: paying to rebuild to code covers it.
• If the house cannot be lived in, Coverage D pays additional living expenses. See loss of use and additional living expenses.

When it is not collapse coverage at all

Several causes of building failure are excluded outright, whatever the result:

• Earth movement and sinkholes. The earth movement exclusion removes coverage for earthquake, landslide, subsidence and sinkhole. Florida has its own statutory rules for sinkhole and catastrophic ground cover collapse coverage; see sinkhole and catastrophic ground cover collapse coverage explained.
• Flood and water pressure. Flood and groundwater are excluded under the water exclusion.
• Wear, tear and deterioration. These stay excluded unless one of the listed collapse causes applies.

If a part of your home falls down

1. Stay out and keep others out. Call the local building department if the rest of the structure looks unstable.
2. Photograph the failed area and the surrounding rooms before anything is cleaned up.
3. Do not discard the failed framing. It is the evidence that the decay or insect damage was hidden.
4. Report the claim promptly, describe it as an abrupt collapse, and use the word "hidden" if it applies.
5. Protect what remains with tarps, bracing or boarding, and save the receipts.
6. Gather your records: inspection reports, repair invoices and the date you last saw the area.
7. Consider an engineer's report on cause. engineering reports and causation disputes explains how they are used.
8. If the claim is denied, ask for the denial in writing with the policy language cited. Steps are in homeowners claim denied: what to do next.

The home insurance claim checklist helps keep the paperwork in one place.

Key takeaways

• The HO-3 covers only an abrupt collapse, meaning a falling down or caving in that makes the building or part of it unusable. Sagging, cracking, bulging, settling and danger of collapse do not count.
• The collapse has to come from a listed cause: a Coverage C named peril, hidden decay, hidden insect damage, weight of contents or people, rain on a roof, or construction defects during the work.
• Decks, fences, patios, foundations, retaining walls and similar structures are covered only if a building collapse causes the loss.
• Prior knowledge of the decay or termites can sink a claim, so inspection reports and repair records matter.
• Policy wording varies, and courts have split on what an undefined "collapse" means. Read your own form and keep the failed material as evidence.