Buying a house in a flood zone: what the flood policy will cost you, and how to keep the seller’s rate
Enter the seller's flood bill and the full-risk premium from their declarations page: your next five bills.
Renewals before your bill reaches the full-risk price
2 renewals
Increases of up to 18 % a year on the capped part. Next five bills: $7,904 in total.
| Renewal 1 (capped) | $1,400 |
| Renewal 2 | $1,626 |
| Renewal 3 | $1,626 |
| Renewal 4 | $1,626 |
| Renewal 5 | $1,626 |
| Five years at the full-risk price at once | $8,130 |
Fixed charges kept outside the cap: $72 a year (Federal Policy Fee and HFIAA surcharge). Rates FEMA sets each year can move the full-risk price itself.
Compiled by Radif Partners · Where the numbers come from · FEMA and OpenFEMA files, rules read in 42 U.S.C. and 44 CFR · not a quote
When you buy a house in a high-risk flood zone with a mortgage, the lender will require flood insurance before closing, and the price you pay depends less on the house than on what happens to the seller's policy. The seller can assign the federal policy to you, or you can buy a new federal policy within one year of the sale: either way you keep the statutory discounts the seller had, and the bill keeps climbing by at most 18 % a year toward the full-risk premium. Let the policy lapse instead and the next one is priced at full risk at once. Two figures on the seller's declarations page tell you what is coming: the premium paid and the Full-Risk Premium, which must always be shown. In A zones, the median single-family bill was $1,197 on July 31, 2026, against a median full-risk bill of $1,626; from there, 2 more renewals of increases remain. If you will rent the house out, the cap becomes 25 % and the surcharge rises.
Ask for the declarations page before you sign
A listing says whether the house is in a flood zone; it rarely says what the flood policy costs. The document that does is the seller's declarations page. FEMA's manual requires every federal declarations page to show the Full-Risk Premium, "Always shown", and, when they apply, the Annual Increase Cap Discount, the Pre-FIRM discount and the Newly Mapped discount (Flood Insurance Manual, Appendix I). The gap between the discounted premium and the full-risk premium is the increase still to come.
A seller who has no flood policy, or a policy only because the lender required it years ago, still gives you information: the house's flood zone, its elevation certificate if one exists, and its claim history, which you can ask about. A house with several past claims may be a severe repetitive loss property, which climbs 25 % a year rather than 18 %.
Keep the seller's discount: assignment or a new policy within a year
Two routes keep the discounts. The seller can assign the policy to you: the assignment endorsement must be signed by the seller on or before closing, and you have until the closing date plus 29 days to send it to the insurer. Or you can buy a new federal policy that takes effect within one year of the sale, which receives any statutory discount the prior policyholder had, as long as the building was insured with building coverage at the time of the sale. Both rules are in FEMA's manual, and FEMA's pricing page sums it up: policyholders "are able to transfer their discount to a new owner" (FEMA).
What does not transfer is the seller's situation. The manual says the annual increase cap "is based on the information provided by the new owner": if the seller lived in the house and you will rent it out, the policy moves to the 25 % track for non-primary residences, and the HFIAA surcharge goes from $25 to $250 (42 U.S.C. 4014(a)(2)).
| If you buy the A-zone median house | Main home | Rented out |
|---|---|---|
| First bill after the sale | $1,400 | $1,703 |
| Bill in year five | $1,626 | $1,851 |
| Five bills added up | $7,904 | $9,107 |
| Renewals before full risk | 2 | 2 |
Discounts tied to the house's history
Two discounts depend on when the house was built or mapped. A Pre-FIRM building, built before the community's first flood map or by the end of 1974, can receive a Pre-FIRM discount on a new policy only if it is a primary residence, not a business and not a severe repetitive loss property; the discount then phases out year by year. A house newly mapped into a high-risk area can receive the Newly Mapped discount if the policy starts within 12 months of the map revision. Both are lost if a policy in the applicant's name lapses, with narrow exceptions. A buyer who was never named on the old policy is a different policyholder, so the seller's past lapse does not count against the buyer for the Pre-FIRM rule.
No 30-day wait at closing
A new federal policy normally starts 30 days after it is bought. The exception that matters to a buyer: when the policy is bought in connection with making, increasing, extending or renewing a loan, there is no waiting period, and coverage starts at the closing, provided the application and the payment are made at or before closing (44 CFR 61.11).
Would the policy cover a flood shortly after you buy?
Would the policy pay for that flood?
Yes
| Rule applied | Bought with a mortgage loan: starts at closing |
| Waiting period | 0 days |
How much coverage the lender will require
For a loan secured by a building in a special flood hazard area, the lender must require flood insurance at least equal to the outstanding principal or the maximum available for the type of building, whichever is less (42 U.S.C. 4012a); for a house, that maximum is $250,000. Contents coverage is not required by that rule; most owners add it anyway, and 79 % of single-family policies carried some on July 31, 2026. Houses facing the waves cost the most: in V zones the median bill was $1,796.
To see the medians where you are buying, type the ZIP code in the lookup on the home page. The flood zones page explains what each zone letter means, and the mandatory purchase page who must buy.