The question people type is about a number: how many dollars of dwelling coverage must I carry? The honest answer is that the number comes out of a test, not a table. Your lender (or the investor that will buy your loan) checks the policy against four things: how the loss is settled, how large the deductible can be, who is named on the policy, and whether the property sits in a mapped flood zone. This post walks through each test at the source rule, shows the arithmetic on one worked house, and ends with the Massachusetts statute that caps what a lender may demand. What a hazard policy is, why escrow exists and how force-placed insurance works are covered on the home insurance cost guide and are not repeated here.
The short version: four tests, no universal dollar figure
| Test | The rule as published | Source and date |
|---|---|---|
| How losses are paid | Replacement-cost basis, with the exception of roofs. A policy that provides these terms is deemed to provide sufficient coverage. | Fannie Mae Selling Guide B7-3-02, effective 08/05/2026 |
| Deductible ceiling | No more than 5% of the property insurance coverage amount, for every required peril, including separate windstorm or wildfire deductibles. | Fannie Mae Selling Guide B7-3-02, effective 08/05/2026 |
| Who is named | A standard or union mortgagee clause without contribution; loss-payable clauses are not acceptable. All titleholders are named insureds. | Fannie Mae Selling Guide B7-3-08, dated 12/14/2022 |
| Flood | Required when the home is in a Special Flood Hazard Area, or in a Coastal Barrier Resources System or Otherwise Protected Area regardless of flood zone. Amount is the least of three numbers (below). | 42 U.S.C. 4012a; Fannie Mae B7-3-06, updated 02/07/2024 |
All four rows were read at the primary source on 2026-10-06. Freddie Mac publishes its own parallel requirements in Chapter 4703 of its Seller/Servicer Guide; this post quotes Fannie Mae because that was the version available to read in full on the day of writing. Your lender may add overlays, so its written requirement controls.
Notice what is missing. There is no row that says 80% of the home's value, 100% of the loan balance, or any fixed multiple. The current Fannie Mae text for one- to four-unit homes tests the policy's loss-settlement terms instead. The rest of this post explains why that works out to "insure the rebuild", and where a lender's own overlay can still push the number higher.
Test one: replacement cost, not market value, not the loan balance
Fannie Mae's rule for one- to four-unit properties says the policy must provide coverage on a replacement-cost basis, with the exception of roofs, and that policies with those terms are deemed to provide sufficient coverage. It also asks for a Special coverage form or equivalent, covering at minimum fire or lightning, explosion, windstorm (including named storms), hail, smoke, aircraft, vehicles, and riot or civil commotion. Separately, the general requirements section requires the insurer to hold at least one of these ratings: A.M. Best B, Demotech A, Kroll Bond Rating Agency BBB, or S&P Global BBB. A bargain policy from an unrated carrier can fail the lender's check even if the dollar limit is right.
The roof exception matters. A policy can settle the roof at actual cash value (depreciated) and still pass. That is the lender's floor, not a recommendation: a roof paid at depreciated value can leave a large gap after a storm, which is why the roof endorsement on your own policy deserves a read.
Three numbers that get confused
The NAIC consumer guide (2022 edition) makes the distinction plainly: your dwelling coverage should equal the full replacement cost of your home, and replacement cost and market value are not the same, because market value includes the land and moves with the real estate market. Replacement cost is the cost to rebuild with materials of similar kind and quality. The loan balance is a third number that has nothing to do with the structure. The table uses one illustrative house to show how far apart the three can sit.
| Figure | Amount | What it measures |
|---|---|---|
| Purchase price | $600,000 | Land plus structure plus location premium |
| Loan balance after 20% down | $480,000 | What the lender is owed |
| Estimated cost to rebuild the structure | $410,000 | Labor and materials to replace the dwelling, excluding land |
Illustrative figures chosen to show the gap; they are not market data. Your own rebuild estimate comes from your insurer or an appraiser's cost approach, not from this table.
On this house a Coverage A (dwelling) limit of $410,000 on a replacement-cost policy satisfies the Fannie Mae test. A limit of $480,000 (the loan balance) would also pass, because the test is the loss-settlement basis, but it would buy $70,000 of coverage that can never be paid, since a replacement-cost policy pays to rebuild, not to retire the loan. A requirement pegged to the loan balance on a home that costs less to rebuild is the situation the Massachusetts statute below addresses.
Test two: the maximum deductible
The ceiling is the one place the rule is a clean percentage. Fannie Mae allows a maximum deductible of 5% of the property insurance coverage amount for all required perils. If a policy carries separate deductibles for different perils, such as wind or wildfire, each one must stay under the 5% line individually. The percentage applies to your Coverage A limit, not to the home's price.
| Dwelling coverage (Coverage A) | 5% ceiling | Typical flat deductible for comparison |
|---|---|---|
| $250,000 | $12,500 | $1,000 to $2,500 flat |
| $410,000 (the illustrative house) | $20,500 | $1,000 to $2,500 flat |
| $600,000 | $30,000 | $1,000 to $2,500 flat |
The ceiling column is arithmetic (coverage x 0.05). The flat-deductible column is a plain-language range for context, not a sourced market average; request an actual quote to see what your insurer offers.
The ceiling rarely bites on a flat dollar deductible, but it bites hard on percentage deductibles. Wind and hail deductibles in some coastal and storm-prone markets are written as a percentage of the dwelling limit. A 5% wind deductible sits exactly at the line and passes; a 10% one fails the test on its face. If a quote shows a percentage wind deductible, do the multiplication before you sign, because a policy that fails will be sent back at underwriting, usually days before closing. Our home insurance cost calculator lets you vary the dwelling limit and see the premium move, which is the fastest way to price a bigger deductible against the premium it saves.
Test three: the mortgagee clause and the named insured
This test costs nothing to pass if you check it early. For one- to four-unit homes, Fannie Mae requires a standard or union mortgagee clause without contribution, customary to the property's location, and says that loss-payable clauses are not acceptable. In plain terms, the mortgagee clause protects the lender's right to be paid even if you, the owner, do something that voids the policy as to you, such as a coverage-voiding act. A loss-payable clause is weaker and does not give the lender that independent protection.
- Spelling matters. The lender's name, followed by "its successors and/or assigns," and its mailing address must appear as the mortgagee. If the lender is not the servicer, the servicer's name and address are specified too. A typo in the clause is a common reason a binder is rejected.
- MERS cannot be the mortgagee. Where a loan is registered with MERS, the guide says MERS must not be named as mortgagee or loss payee; the servicer's name goes there instead.
- Every titleholder is a named insured. The individual policy must name all persons holding title, so a spouse on the deed but not on the policy can fail the test.
- The policy must give written notice of cancellation to the named insured and the mortgagee(s) before the insurer can cancel. Ask your agent to confirm the form does.
Test four: flood, the only federal mandate
Everything above is investor and lender policy. Flood is different because Congress wrote it into law. Under 42 U.S.C. 4012a, a regulated lender may not make, increase, extend or renew a loan secured by improved real estate in an area identified as having special flood hazards unless the property is covered by flood insurance for the term of the loan. The required amount is the outstanding principal balance or the maximum coverage available under the program for that type of property, whichever is less.
Fannie Mae's flood section translates that for one- to four-unit homes into the lesser of three figures: 100% of the replacement cost value of the improvements, the maximum coverage available from the National Flood Insurance Program (NFIP), or the unpaid principal balance. It defines a Special Flood Hazard Area (SFHA) as any zone beginning with the letter A or V, and it applies the same requirement to a property in a Coastal Barrier Resources System (CBRS) unit or Otherwise Protected Area (OPA), regardless of whether the property is in an SFHA. And the deductible may not exceed the maximum the NFIP currently offers for the dwelling form.
| Candidate figure | Amount | Binding? |
|---|---|---|
| 100% of replacement cost value | $410,000 | No |
| Unpaid principal balance | $480,000 | No |
| NFIP maximum building coverage | $250,000 | Yes, the least of the three |
The NFIP residential building limit of $250,000 is from FloodSmart.gov, read 2026-10-06. Contents coverage is a separate NFIP policy limit of $100,000 and is not part of the lender requirement.
The lesson of that table is that a lender's flood requirement stops at $250,000 of building coverage even when the rebuild costs $410,000. The $160,000 difference is yours to decide. Some owners buy excess flood coverage from a private insurer to close it; the lender does not require that. FloodSmart notes that a standard NFIP policy takes effect 30 days after purchase, with an exception for purchases made in connection with a mortgage transaction, which is why a flood policy bought for closing begins on time. Outside an SFHA the federal mandate does not apply, though a lender can still require flood coverage on its own judgment. To see what a policy might cost for your address and elevation, use the flood insurance cost calculator.
FHA flood rule and condos
The FHA handbook, in its current Update 18 (last revised 8/12/2026), sets the amount as the lowest of three figures: 100 percent replacement cost of the insurable value of the improvements (defined as the development or project cost less estimated land cost), the maximum NFIP coverage available for that type of property, or the outstanding principal balance of the mortgage. The land deduction therefore applies to the value of the improvements, not to the loan balance, and the result is the same lowest-of-three structure Fannie Mae uses. For condominiums in an SFHA, the same handbook requires the Condominium Association to obtain flood insurance on the buildings, protecting the interests of unit owners as well as the common areas. Condo master and unit-owner coverage is its own topic; we cover it in the companion post on HO-6 versus the HOA master policy.
Getting the replacement-cost number right
Because the lender's test is about replacement cost, the number that matters is your rebuild estimate, and there are only a few legitimate ways to get one.
- Your insurer's estimator. Most carriers run a cost estimator on square footage, construction type, roof, finishes and ZIP code. It is free and is the number the policy is written against, but it is only as good as the inputs. Wrong finish level (builder-grade versus custom) is the usual error.
- The appraisal's cost approach. A lender's appraisal often includes a cost-approach section, which gives a second opinion you already paid for. Ask for it. It is not an insurance quote, but it will tell you if the carrier's estimate is far off.
- A contractor or estimator you hire. For an older or unusual home, an independent rebuild estimate can prevent a large shortfall.
- An endorsement that moves the risk. Guaranteed replacement cost pays to completely rebuild the home. An inflation guard endorsement raises the dwelling limit annually in line with inflation. The NAIC guide lists both as ways to increase coverage, and adds an ordinance or law endorsement, which pays the extra expense of rebuilding to codes that did not exist when the home was built. A lender does not require these, but they decide whether a total loss is actually covered.
The NAIC guide also warns that if your dwelling coverage drops below 80% of the full replacement cost, the insurer may reduce what it pays on a claim. So the 80% figure exists, but it is an insurer's coinsurance-style penalty, not the lender's requirement. After a few years of construction inflation a limit set at closing can slide under that line, which is another reason to re-quote the dwelling limit at every renewal.
Massachusetts: the statute that caps what a lender may require
Massachusetts is the clearest example of the law pushing the other direction. General Laws chapter 183, section 66 provides that a bank, lending institution, mortgage company or any mortgagee doing business in the commonwealth, when making a mortgage loan, shall not require as a condition of the mortgage that the mortgagor purchase casualty insurance on the mortgaged property in an amount in excess of the replacement cost of the buildings or appurtenances. The statute adds that "replacement cost", "buildings" and "appurtenances" are to be read consistently with the policy forms approved by the commissioner of insurance.
Two features of that text matter for a Massachusetts buyer. First, it is a ceiling and not a floor: it says a lender cannot demand more than replacement cost, and it says nothing about the minimum. Second, it speaks of the buildings and appurtenances, so land value cannot be counted toward the requirement. Together those two features rule out the "insure to the loan balance" shortcut whenever the loan balance exceeds the cost to rebuild, which on a Boston-area condo or a high-land-value lot is routine.
| Item | Amount |
|---|---|
| Purchase price | $600,000 |
| Loan balance | $480,000 |
| Insurer's replacement-cost estimate for the structure | $410,000 |
| Most a covered lender may require under G.L. c.183 s.66 | $410,000 |
| Amount that would exceed the statute | Any requirement above $410,000, such as the $480,000 loan balance |
Illustrative arithmetic only. It shows how the cap would work if it applies to your lender; it is not legal advice.
The federal preemption wrinkle
The statute does not apply to every lender with equal force. In September 2012 the U.S. District Court for the District of Massachusetts held, in Silverstein v. ING Bank, fsb, that the federal Home Owners' Loan Act preempted this very limit as applied to a federal savings bank, because the limit falls within the illustrative list of preempted state laws in the HOLA implementing regulations. The case is summarized in an Orrick client alert. The borrower had alleged that the bank required coverage equal to the outstanding principal balance, which exceeded replacement cost.
What that means in practice: the cap is real law, but whether a given lender can be held to it can depend on what kind of institution it is. The 2012 ruling also predates a change in federal law: 12 U.S.C. 1465, added by the Dodd-Frank Act, says preemption for federal savings associations is decided under the standards applicable to national banks and that the chapter does not occupy the field in any area of State law, so Silverstein's reasoning may not reach newer loans. Treat the statute as strong leverage rather than a guarantee, and see the statute text. The practical move is to send the lender your insurer's replacement-cost estimate in writing and ask what specific figure it requires and under what authority. A lender selling the loan to Fannie Mae already has the Fannie Mae test in front of it, and that test is replacement-cost based.
VA loans: a general standard, not a formula
VA-guaranteed loans require that the home be sufficiently insured against hazards, and the VA rule is general rather than a formula. 38 CFR 36.4329 calls for policies procured and maintained in an amount sufficient to protect the security against the risks or hazards to which it may be subjected to the extent customary in the locality, with a separate flood requirement in special flood hazard areas. It sets no dollar percentage comparable to the Fannie Mae and FHA text above. The practical advice is the same as elsewhere: ask your VA lender for its written insurance requirement before you bind a policy, and give it the replacement-cost estimate. If the lender asks for coverage at the loan balance on a home that would cost less to rebuild, you are in the same situation as the Massachusetts example.
What happens if your policy falls short
If the policy lapses or fails the tests after closing, the servicer can buy force-placed coverage and bill you; the rules on notice and charges are on the home insurance guide, and the short version is that it costs more and protects less than a policy you buy yourself. For flood, the statute is blunter: if you do not buy the required amount within 45 days of the lender's notice, the lender must buy it and may charge you for the premiums and fees.
A pre-closing checklist
- Ask the lender for its written insurance requirement, including any overlay above the investor minimum.
- Get a replacement-cost estimate from the insurer and keep a copy.
- Confirm the policy is written on a replacement-cost basis (roof excepted) on a Special form.
- Multiply Coverage A by 5% and compare every deductible, including percentage wind and hail deductibles, against that figure.
- Check the mortgagee clause wording, the servicer's name and address, and that every titleholder is a named insured.
- Look up the flood zone. If it begins with A or V, price NFIP coverage and decide whether to add excess flood above $250,000.
- Send the binder and the declarations page to the lender, and confirm receipt before closing day.