Flood Damage Not Covered by Flood Insurance

Basement and Below-Grade Exclusions

The NFIP's basement exclusions are among the most consequential and least understood provisions in the policy. Personal property stored in a basement or any area below the lowest elevated floor receives no coverage at all. This means furniture, electronics, clothing, stored belongings, exercise equipment, and anything else you keep in a below-grade space is excluded from your contents claim regardless of how much contents coverage you carry.

The building coverage for basements is limited to essential systems and structural components. Covered items in basements include the foundation walls, the structural floor above, stairways and staircases that provide access to the basement, electrical outlets and wiring, central air conditioning equipment, furnaces, water heaters, fuel tanks, sump pumps, and well water tanks. These items are covered because they are integral to the building's function and cannot reasonably be relocated above grade.

What building coverage does not include in basements: finished walls (drywall, paneling, wallboard), finished floors (carpet, tile, hardwood), finished ceilings, interior partition walls, built-in cabinetry, and any improvements that make the basement a livable space. If you have a finished basement with a family room, home theater, bathroom, or bedroom, the finishes in that space are not covered. The structural shell is covered, but everything that makes it a living space is not.

This exclusion applies to any area that FEMA defines as below grade, which includes walkout basements, garden-level apartments, and any enclosed area where the floor is below ground level on all sides. A walkout basement that has a door at ground level on one side but is below grade on the other three sides is still classified as a basement for NFIP purposes and is subject to the same exclusions.

Property Outside the Building

Flood insurance covers only the insured building and its contents. Property located outside the building's walls is excluded from coverage. This includes landscaping (trees, shrubs, lawns, gardens), fences and retaining walls, patios and decks that are not structurally attached to the building, swimming pools, hot tubs, septic systems, wells, driveways, walkways, and any other structures or improvements on the property that are not part of the insured building.

Detached garages are also excluded unless they are specifically listed on the flood insurance policy as an insured building. If your property has a detached garage, workshop, or storage building, each requires its own separate flood insurance policy or an endorsement on the primary policy. Many homeowners discover this exclusion only after a flood destroys a detached structure they assumed was covered under their primary policy.

Outdoor property damage from flooding can be expensive to repair. Replacing a destroyed fence costs $3,000 to $10,000, regrading and replanting landscaping costs $2,000 to $15,000, and rebuilding a damaged retaining wall can cost $5,000 to $20,000 or more. None of these costs are recoverable through your flood insurance policy.

Vehicles and Watercraft

Flood insurance does not cover vehicles, including cars, trucks, motorcycles, ATVs, and golf carts. If floodwater damages your vehicle, the coverage comes from your auto insurance policy's comprehensive coverage, not from your flood insurance. Comprehensive auto coverage is an optional add-on to your auto policy, and if you do not carry it, flood damage to your vehicle is entirely uninsured.

Watercraft, including boats, jet skis, canoes, and kayaks, are also excluded from flood insurance coverage. Self-propelled vehicles of any kind are explicitly excluded from the NFIP policy. If floodwater damages a boat stored in your garage or driveway, neither your flood insurance nor your homeowners insurance covers the loss. Separate marine insurance or a boat insurance policy is needed for watercraft protection.

Financial Instruments and Valuables

The NFIP excludes coverage for currency, precious metals, stock certificates, bond certificates, deeds, bills, and similar financial instruments. If you store cash in your home and it is destroyed by floodwater, the policy pays nothing for that loss. The same applies to gold, silver, platinum, coins kept for their metal value, and any paper securities or financial documents.

Personal property that is difficult to value is also subject to limitations. Artwork, antiques, and collectibles are covered under the contents portion of the policy, but only at actual cash value. A painting that you purchased for $5,000 twenty years ago may have appreciated significantly, but the NFIP will pay only the depreciated value of the physical object, not its collector or appraised value. Homeowners with valuable collections should consider a separate valuable articles policy or floater that covers these items at their appraised value.

Living Expenses and Temporary Housing

The NFIP does not provide additional living expense (ALE) coverage. If your home is uninhabitable after a flood and you need to stay in a hotel, rent a temporary apartment, or pay for meals because your kitchen is unusable, flood insurance pays nothing toward those costs. This is one of the most significant gaps between flood insurance and standard homeowners insurance, which typically includes ALE coverage for covered losses.

Temporary housing after a flood can cost $2,000 to $5,000 per month depending on your area, and major flood damage repairs can take three to six months or longer. Without ALE coverage, a homeowner could face $10,000 to $30,000 in temporary living costs that no insurance policy covers. FEMA disaster assistance may provide some temporary housing assistance after a presidential disaster declaration, but this assistance is limited, slow, and not guaranteed.

Some private flood insurance policies include ALE coverage as a standard feature or optional add-on. If temporary housing costs are a concern, a private flood policy with ALE coverage addresses this gap in a way that the NFIP cannot.

Moisture and Mold Not From the Flood

Flood insurance covers mold only when it results directly from a covered flood event and the policyholder took reasonable steps to prevent mold growth. Mold that develops from non-flood sources, such as chronic humidity, condensation, plumbing leaks, roof leaks, or poor ventilation, is excluded from flood insurance coverage entirely. For a detailed explanation of mold coverage conditions, see our guide on flood insurance and mold coverage.

Moisture damage that occurs gradually rather than from a sudden flood event is also excluded. If your foundation has a chronic water intrusion problem that worsens over time, the resulting damage to walls, floors, and stored belongings is not covered by flood insurance even if the water enters from outside the building. Flood insurance covers sudden inundation from flood events, not ongoing moisture problems.

Earth Movement and Erosion

Flood insurance does not cover damage caused by earth movement, even when the earth movement is triggered by flooding. If floodwater saturates a hillside and causes a landslide that damages your home, the landslide damage is excluded from flood coverage because the proximate cause of the damage is earth movement, not the flood itself. Similarly, sinkholes, mudflows on non-natural slopes, subsidence, and erosion are excluded perils under the NFIP.

There is one exception: mudflow is covered by the NFIP if it meets the specific NFIP definition. The NFIP defines a covered mudflow as a river of liquid and flowing mud on the surface of normally dry land, caused by unusual and substantial accumulation of water. Mudflow coverage under the NFIP has a narrow definition that excludes many events that homeowners would reasonably describe as mudflows, so the coverage is less comprehensive than it may appear.

Coastal erosion is a particular concern because it can undermine foundations and destroy property without a single dramatic flood event. Long-term shoreline erosion that gradually removes land beneath or around your home is not a covered peril. Even if a major storm accelerates erosion and your home is damaged as a result, the erosion component of the damage is excluded from the flood claim.

Sewer and Drain Backup

The NFIP does not cover sewer backup or drain backup unless the backup is caused directly by flooding. If heavy rain overwhelms the municipal sewer system and sewage backs up into your home through floor drains, that damage is excluded from your flood insurance unless a general condition of flooding also exists in the area. The distinction is whether the backup results from a flood event or from a localized infrastructure failure.

When a flood and a sewer backup occur simultaneously, which is common during major flood events, the flood insurance covers the flood damage but may not cover the additional contamination from the sewer backup. Adjusters evaluate these overlapping situations on a case-by-case basis, and the resulting coverage determinations can be contentious.