How much flood insurance do I need?

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How much flood insurance you need is the cost to rebuild your house plus the value of everything inside it. The National Flood Insurance Program will sell you up to $250,000 for the house and $100,000 for your belongings, and building a typical single-family home cost an average of $428,215 in the National Association of Home Builders’ most recent construction cost survey. When rebuilding your house costs more than the program will sell you, the only place to get the rest is a private flood insurer.

Private insurers handle that two ways. One is a policy that replaces your NFIP coverage entirely and is written for the full cost of rebuilding your house. The other is an excess policy that sits on top of an NFIP policy and starts paying once the federal limits are used up.

Ask a local contractor what it would cost to rebuild your house today, and add up what it would cost to buy your possessions again. Take both numbers to an agent and get quotes on each route — the premiums tell you which one insures your full rebuild for less, and either one leaves you with coverage that matches what a total loss would actually cost you.

How to calculate how much flood insurance you need

Start with what it costs to rebuild, add what you own, then measure both against the NFIP caps and your lender’s minimum.

The formula: Home replacement cost + value of possessions = flood insurance you need

A rebuild cost above $250,000, or possessions worth more than $100,000, means an NFIP policy can’t cover a total loss on its own.

How much flood insurance to buy

Calculating how much flood insurance you need starts by understanding how much it will cost to replace your home and possessions and then checking to see what your mortgage lender requires. Working with a professional will enable you to find the most accurate amount.

“The best way to figure out how much insurance you need is to sit down with an agent and evaluate your options together,” says Allen Anderson, senior vice president of personal lines at Selective Insurance.

Here’s a closer look at each step in the process of calculating how much flood insurance to buy:

Determine your house’s replacement cost: Average construction costs are $162 per square foot, according to the latest Cost of Constructing a Home survey from the National Association of Home Builders. You can multiply this number by your home’s square footage to get a rough estimate of your replacement cost. For a more exact figure, talk to a local contractor or use an online cost-to-build calculator.
Tally your possessions: You should have a home inventory already, but if you don’t, now is the time to make one. Assign a value to your possessions and add up the numbers to see how much coverage you need for contents. You can also find personal property calculators online to help with this process.
Check with your lender: Mortgage lenders will require flood insurance if your property is in a high-risk flood area, and you’ll need to maintain at least as much insurance as they require. Remember: their requirement is just the floor, and you can – and probably should – buy more, depending on the replacement cost of your home.
Calculate your insurance gap: Coverage through NFIP is capped at $250,000 for a single-family home and $100,000 for its contents. Subtract these amounts from your home’s replacement value and the value of your personal possessions to determine your insurance gap. This is the amount of private flood insurance you need to buy for full coverage.

Insure the building to at least 80% of its full replacement cost

The NFIP pays replacement cost — the price of rebuilding at today’s labor and material prices, with no deduction for wear and tear — only when the home is a single-family dwelling, it’s your principal residence for at least 80% of the year, and your building coverage equals at least 80% of the full replacement cost or the $250,000 maximum, according to FEMA’s Summary of Coverage. Fall below that and claims are settled at actual cash value, which is the replacement cost minus depreciation.

Should you get federal NFIP or private flood insurance?

Homeowners can buy insurance through the federal National Flood Insurance Program or a private insurance company. Which you choose depends on how much coverage you need and where you live.

If you live in a high-risk flood zone and have a government-backed mortgage, you’ll be required to purchase an NFIP policy. If you need coverage beyond the NFIP policy limits, live in a lower-risk area or don’t have a government-backed mortgage, private insurance is an option for you.

Your situation	Better fit	Why
High-risk zone, government-backed mortgage	NFIP	Coverage is mandatory and no lender can reject the federal policy
Rebuild cost above $250,000	Private	No NFIP policy pays past $250,000 on the building
Possessions worth more than $100,000	Private	NFIP contents stop at $100,000, paid at depreciated value
You’d need somewhere to live during repairs	Private	The NFIP pays nothing toward temporary housing
Finished basement	Private	The NFIP excludes finished walls, flooring and belongings below ground
Your home has flooded before	NFIP	The NFIP can’t drop you over your risk while premiums are paid
Newer or elevated home outside a high-risk zone	Private	Carriers price your property, not your community’s flood map
Community doesn’t take part in the NFIP	Private	Federal policies are sold only in participating communities

Where private flood insurance falls short

Private insurance is often cheaper than NFIP, but these policies don’t come without drawbacks.

Private insurance may not be available to homeowners in some high-risk areas
Private insurance can be cancelled if an insurer deems your property too risky

“In the end, transparency about your property and possessions will help you obtain appropriate coverage and peace of mind,” Anderson says.

Don’t wait too long to get flood insurance

No matter how you buy flood insurance, don’t wait until a storm is on the horizon to purchase a policy. New NFIP policies have a 30-day waiting period, while private insurers require policies be in effect for 10 to 14 days before covering a loss.

“It’s important to remember that if you wait to buy insurance until the threat of flood is imminent, it may not protect you from the potential financial losses caused by a flood,” according to Anderson.

What each policy covers

Federal terms are identical for everyone. Private terms vary by carrier, so read the right-hand column as what exists in the market, not what any one policy includes.

Below is a look at what types of coverage you can receive through the NFIP vs. a flood policy from a private insurance company.

Feature	NFIP	Private flood insurance
Building coverage	$250,000 for a single-family home	Set by carrier, well above the federal cap
Contents coverage	$100,000, paid at depreciated value	Set by carrier, replacement cost available from some
Temporary housing	Not covered	Offered by some carriers
Increased Cost of Compliance	Up to $30,000, inside the $250,000 limit	Varies by carrier
Debris removal	Covered	Covered
Waiting period	30 days, with exceptions	Set by carrier, often shorter
Renewal	Can’t be dropped for risk while premiums are paid	Carrier can non-renew

Replacement cost doesn’t equal market value

Don’t make the mistake of thinking your home’s market value is the same as its replacement cost.

The market value factors in your home’s age and condition. Rebuilding from the ground up is typically more expensive. If you rely on your tax assessment or the value from a site like Zillow, you could find yourself underinsured.

What actually gets paid by flood insurance (and what doesn’t)

Flood insurance pays for direct damage caused by floodwaters. It covers the cost to repair or rebuild your home and replace damaged possessions, up to your policy limits. Exterior property features such as fences and swimming pools aren’t covered, and if you have an NFIP policy, it won’t pay for temporary living arrangements.

Covered	Not covered
Structure and foundation	Decks, patios, fences, pools, hot tubs, seawalls, septic systems, landscaping
Electrical and plumbing systems	Temporary housing and living expenses (NFIP)
Furnaces, water heaters, central air	Business interruption and loss of use (NFIP)
Refrigerators, stoves, built-in appliances	Cars and most self-propelled vehicles
Permanent carpeting, paneling, cabinets, blinds	Currency, precious metals, stock certificates
Detached garage, up to 10% of building coverage	Most personal property in a basement (NFIP)
Clothing, furniture, electronics	Finished flooring and walls below the lowest floor (NFIP)
Debris removal	Mold or mildew the owner could have prevented

What happens if you don’t have enough flood insurance?

If your home is damaged by a flood and you don’t have coverage, every dollar of damage above your limits comes out of your own savings. The average NFIP claim payment between 2020 and 2024 was $82,614, according to FloodSmart, FEMA’s flood insurance site.

Skipping a policy because you’re outside a high-risk zone carries the same exposure. Nearly one-third of NFIP claims filed between 2014 and 2024 — 29% — came from properties outside current high-risk areas, per FloodSmart, and coverage in those areas costs less than in a Special Flood Hazard Area.

“Just because you don’t live in an area where you are required to have flood insurance to get a mortgage doesn’t mean you don’t live in a flood zone,” says Allen Anderson, senior vice president of personal lines at Selective Insurance.

With flood insurance, it’s usually better to be safe than sorry, Anderson says. Homeowners who live in lower-risk areas may think they can skip coverage, but 20% of flood damage insurance claims are for homes in low to moderate risk areas, according to the Insurance Information Institute.

When your flood coverage starts

Buy your policy before storm season, not during one. A new NFIP policy takes effect 30 days after you apply and pay, so a policy bought once a storm is named pays nothing toward that storm.

Buying in advance is what puts those 30 days behind you — the coverage is already active when water reaches the house.

FEMA shortens or waives the wait in three narrow cases, none of which help a homeowner racing an approaching storm.

Buying at a loan closing. Coverage tied to making, increasing, extending or renewing a loan starts at closing, as long as the application and premium land at or before closing.
Newly mapped into a high-risk zone. One-day waiting period, available for 13 months from the map’s effective date.
Flooding after a wildfire on federal land. One-day waiting period if you buy within 60 days of the fire being contained.

Private carriers set their own waiting periods, often around 10 to 14 days, and several waive the wait for a loan closing or a policy rolling over from another insurer. Even the shortest private wait runs longer than the notice most storms give.

Frequently Asked Questions

Does homeowners insurance cover flood damage?

No. Standard homeowners insurance policies won’t cover flood damage. You’ll need a separate flood insurance policy to pay for damage caused by floodwaters.

Are basements covered by flood insurance?

NFIP policies limit what is covered in basements. Mechanical systems, such as furnaces, are covered as are any components plugged into a power supply. That means appliances such as washers, dryers and freezers are covered. However, NFIP policies exclude personal property stored in the basement as well as finished floors and walls.

Private flood insurance may provide greater coverage for basement contents and improvements. So if your basement is finished, you may want to explore your coverage options on the private market.

What is a Special Flood Hazard Area?

A Special Flood Hazard Area (SFHA) is an area designated by FEMA as a high-risk zone where the NFIP’s floodplain management regulations have to be enforced. It’s also where purchasing flood insurance is mandatory for mortgage holders.

When is flood insurance required?

Any homeowner who lives in a high-risk flood area and has a government-backed mortgage must purchase flood insurance. Keep in mind that even if you live outside of high-risk flood areas and flood insurance isn’t federally required, your mortgage lender may still require that you obtain flood insurance to get approved for a loan.

Will flood insurance pay for mold and mildew damage?

Mold and mildew damage is covered by flood insurance if it is a result of floodwaters and the damage could not be avoided.

If you delay clean-up or fail to remove wet carpeting and furnishings that contribute to mold growth, the damage may not be covered by insurance. Also keep in mind that NFIP policies won’t cover any damage to finished basements beyond mechanical and structural components.

Maryalene LaPonsie

Staff Writer

Maryalene LaPonsie is a staff writer for Insure.com. She has 25 years of professional writing experience. She specializes in personal finance — insurance, investing and retirement.