Most homeowners have never read their insurance policy. They assume it covers "everything." Then the sewer backs up, or the basement floods, or mold spreads through a wall — and they discover that insurance pays nothing.
Here is every major homeowners insurance exclusion you need to know — and what to do about each one.
1. Floods
The most expensive exclusion in American residential insurance. Floods are excluded from every standard homeowners policy in the US — no exceptions.
What "flood" means to insurers: water that enters from outside, at ground level or below. This includes:
- Storm surge from hurricanes
- Overflowing rivers, creeks, or drainage ditches
- Heavy rainfall that overwhelms storm drains
- Flash floods
- Tidal flooding
The fix: A separate flood insurance policy through the NFIP or a private flood carrier. Premiums average $700–$1,500/year. Outside high-risk zones, NFIP policies can be $300–$600/year. There's a 30-day waiting period — you cannot buy flood insurance when a storm is approaching.
2. Earthquakes
Like floods, earthquake damage is universally excluded from standard homeowners policies. Earth movement of any kind — earthquakes, aftershocks, sinkholes, landslides, mudslides — is specifically carved out.
This matters far beyond California. The New Madrid Seismic Zone runs through Missouri, Tennessee, Arkansas, and Illinois. The Pacific Northwest is at risk. Virginia had a 5.8 magnitude quake in 2011 that damaged the Washington Monument.
The fix: Separate earthquake insurance. In California, the California Earthquake Authority (CEA) offers policies. Nationwide, private carriers and some major insurers offer earthquake endorsements. Deductibles are typically 5–25% of dwelling coverage — build this into your financial planning.
3. Sewer and Drain Backup
This is the most commonly underpurchased endorsement in homeowners insurance. When a sewer main backs up or a sump pump fails, sewage enters through floor drains, toilets, and basement walls. The remediation cost — tear-out, drying, replacing flooring, walls, contents — routinely runs $10,000–$40,000.
Standard homeowners policies exclude this. Sewer backup is not the same as water damage from a burst pipe (which is covered). It requires a specific endorsement.
The fix: Sewer backup coverage endorsement — typically $50–$150/year for $10,000–$25,000 of coverage. One of the best values in insurance.
4. Mold
Mold coverage is complicated — policies vary widely. Here's the general rule:
- Sudden event mold: If a burst pipe causes water damage and mold results, the mold remediation may be partially covered as part of the covered water loss — but often only up to a sublimit (frequently $10,000)
- Gradual / neglect mold: Not covered. A slow leak under a sink that you didn't fix, condensation from a window, chronic bathroom moisture — mold from these sources is excluded
- Pre-existing mold: Not covered
Mold remediation can cost $10,000 for a small area and $50,000+ for whole-house infestations. The best strategy: maintain your home, fix leaks immediately, and ensure adequate ventilation.
5. Normal Wear and Tear
Insurance is designed for sudden, accidental losses — not gradual deterioration. These are never covered:
- Aging roof that starts leaking after 20 years
- Old plumbing that fails after decades of use
- Foundation cracking due to soil settlement over time
- HVAC systems that break down after years of use
- Peeling paint, rotting wood, deteriorating siding
This is why home maintenance matters for insurance purposes, too. A poorly-maintained roof that suffered wind damage may have a claim denied or reduced due to pre-existing deterioration.
6. Pest Damage (Termites, Rodents, Birds)
Termite damage, rodent infestations, bird nesting damage — all excluded. Pest damage is considered preventable through maintenance. Termite damage alone averages $3,000 per home and is not covered by any standard homeowners policy. Regular pest inspections are your only protection here.
7. Power Outage Spoilage
Refrigerator and freezer contents lost to power outages? Excluded from standard policies, though some carriers offer food spoilage coverage as an endorsement ($25–$50/year). Utility company liability for extended outages is limited, and claims often go unpaid.
8. Nuclear Hazard, War, Government Action
Government seizure, war-related damage, and nuclear events are universally excluded. These are "uninsurable" events that the private insurance market cannot absorb.
9. Business Activity (Home Offices)
If you run a business from home, equipment losses and liability arising from business activity are excluded from standard homeowners policies. Business property coverage is capped at $2,500. A client injured at your home office is a business claim — not a homeowners claim.
10. Intentional Damage
Any damage you intentionally cause is excluded. This includes arson (burning your own home is fraud), damage during domestic disputes, and property destruction you deliberately cause. There are no grey areas here.
The Coverage Gap Checklist
Use this checklist to identify your gaps:
- ☐ Flood: Do you have a flood policy? (Required in flood zones; strongly recommended everywhere)
- ☐ Earthquake: Are you in a seismic risk area? (More than just California)
- ☐ Sewer backup: Do you have the endorsement? ($50–$150/year)
- ☐ Mold sublimit: Check your policy — what is the cap?
- ☐ Home business: Do you work from home? (Coverage needed)
- ☐ Home maintenance: Is your roof, plumbing, and foundation in good condition? (Required for coverage to apply)
Bottom line: Standard homeowners insurance is excellent for fire, theft, wind, hail, and liability. But the gaps — floods, earthquakes, sewer backup, mold, wear and tear — represent exactly the losses that devastate families financially. An annual review with an independent agent takes 30 minutes and can identify every gap in your current coverage.