Home and flood insurance when you buy a US house

Two policies, two jobs

A US home insurance policy, also called homeowners insurance, pays for damage to the house and its fixtures, to your belongings, and for liability if someone is injured on your property. The National Association of Insurance Commissioners (NAIC), the body of the state insurance regulators, lists the usual extended perils as windstorm, hail, explosion, smoke, theft and vandalism, among others. It also lists what is left out: flood and earthquake need separate policies.

Flood is the one that surprises buyers, because they assume the home policy includes it. FEMA puts it simply: most homeowners insurance does not cover flood damage, and flood insurance is a separate policy that can cover the building, the contents or both.

What the lender will demand

Home insurance

The NAIC notes that most lenders require homeowners insurance. For loans that Fannie Mae buys, the Selling Guide spells out the standard. You choose the insurer, as long as the policy meets the guide. The policy must be written on a replacement cost basis, roofs excepted, and cover fire, windstorm including named storms, hail and the other listed perils. The maximum deductible for these perils on a one- to four-unit property is 5% of the coverage amount. Another lender may set different terms, so ask for its list at the start.

Flood insurance

Flood cover is required by law, not only by the lender's preference, in one situation. The Flood Disaster Protection Act of 1973 makes flood insurance a condition of federal financial assistance for buildings in special flood hazard areas. The Office of the Comptroller of the Currency explains what that means for you: if the property is in such an area, any federally regulated lender will require flood insurance before it gives you a mortgage, and it needs proof of adequate cover before closing. Fannie Mae's guide adds that all flood zones beginning with the letter A or V count as special flood hazard areas, and that cover must equal the lesser of the replacement cost of the building, the maximum NFIP amount or the unpaid loan balance.

Outside those areas the rule is softer. A lender may still require flood insurance, which the OCC calls a matter of contract between you and the lender. Treat it as a question for the lender, and treat the premium as something to price either way.

How to find the flood zone before you offer

FEMA publishes the flood maps. Its Flood Map Service Center lets you search an address and view the map data or download a FIRMette, a map extract for that address. Do this for every house on your shortlist, then ask the seller or agent for any flood history and whether an elevation certificate exists. Your lender will run its own flood determination, but you can know the answer weeks earlier.

A zone label is not a promise. FEMA's page says floods can happen anywhere.

What a federal flood policy covers, and what it does not

FloodSmart, the NFIP's consumer site, lists the residential limits of up to $250,000 for the building and up to $100,000 for the contents, as checked on 5 October 2026. Building cover includes the electrical and plumbing systems, furnaces and water heaters, and built-in appliances. It does not cover property outside the building such as landscaping, septic systems, decks, fences or swimming pools. It does not cover temporary housing or additional living expenses while the house is repaired, and personal property in a basement is excluded.

Two consequences follow. A house worth more than the building limit needs top-up cover, and the NAIC says private insurers tend to offer higher limits and optional extras. Private cover also has terms of its own, so compare them line by line. Second, a flood claim does not pay for a hotel, so keep a cash reserve.

The 30-day waiting period

FEMA says to plan ahead, because there is typically a 30-day waiting period for an NFIP policy to go into effect, unless the cover is required by a government-backed lender or is related to a community flood map change. FloodSmart lists the same exceptions in its policy terms, including a policy bought at the same time as the mortgage transaction.

In practice this means the following:

• Buying with a mortgage in a high-risk zone: the policy is bought for closing and the waiting period does not hold you up. Ask your agent to confirm the effective date.
• Buying with a mortgage outside a high-risk zone: if you take flood cover voluntarily, ask whether the waiting period applies to it. Do not assume it does not.
• Buying with cash: nothing forces cover at closing and the 30 days apply. If you want to be insured on the day you take the keys, buy it a month ahead, which means before you own the house.

Wind and hurricane deductibles are a third item

In coastal states, wind damage from storms is often handled by its own deductible. Florida law gives a clear example. A policy with a hurricane deductible must say prominently that it contains a separate deductible for hurricane losses, and insurers must offer $500, 2%, 5% and 10% of the policy dwelling limit, with adjustments for higher-value homes. A percentage deductible grows with the insured value: 5% of a $400,000 dwelling limit is $20,000, which you pay before the insurer does. That is arithmetic on the statute's percentages, not a quote for any policy.

Fannie Mae's cap of 5% of the coverage amount applies to loans it buys. Other states use different terms, such as named-storm or wind and hail deductibles, so ask each insurer what the deductible is and how it is calculated. Our Florida guide explains the state's insurance market in more detail.

What escrow does with the premium

Many lenders require an escrow account. The CFPB describes it as an account set up by your lender to pay property-related expenses, specifically property taxes and homeowners insurance. A portion of your monthly mortgage payment goes into it, so you do not face one or two large bills a year. The CFPB adds that taxes and premiums change from year to year, and your escrow payment, and your total monthly payment, change with them.

Ask the lender whether the flood premium is collected through escrow too, and ask for the full estimate of monthly cost, including all insurance. Our guide to closing costs and title insurance covers the one-off costs at closing.

Getting quotes before you make an offer

• Pick the address first. Quotes depend on the exact property, so wait until you have a house you would genuinely buy, then ask an independent agent for quotes on that address.
• Ask for the facts that move the price. Ask the seller for the age of the roof, the flood zone, any elevation certificate and the claims history.
• Get three quotes: home, wind where it is separate, and flood. Put the deductible for each on one line, in dollars as well as percentages.
• Give the quotes to the lender early. The lender's required coverage may change the policy you need.
• Add the premiums to your budget. Include them in the monthly figure you compare with Miami and South Florida or any other market you are considering.

We cannot say what it will cost: premiums depend on the address, the roof, the flood zone and the insurer. Take the actual figure from the quote.

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