HOMEOWNERS GUIDE

How much homeowners insurance do I need: the dwelling coverage worksheet

One number decides most of the answer: the cost to rebuild your home. The NAIC consumer guide states the rule plainly: your dwelling coverage should equal the full replacement cost of your home. This worksheet walks the four steps in order: estimate the rebuild, check the limit against the 80 percent line, read off the limits that are set as percentages of it, then choose the two limits that are yours alone.

Disclaimer: Education and worksheet only, not a quote and not insurance advice. Percentages below are the NAIC guide’s typical limits; your insurer may set different ones, and your declarations page is the record of your policy.

Step 1: Estimate what rebuilding would cost

Start from the structure, not from a price tag. Rebuilding cost is the cost to put back a similar home, with similar materials and features, on the same lot, at current local labor and material prices. It excludes the land, which does not burn down, and it ignores what a buyer would pay, which is why it so often differs from market value. Our replacement cost vs market value guide works through the distinction in full. For the worksheet, you need one figure you can defend: the insurer’s own rebuilding estimate with its inputs shown (square footage, construction type, roof, kitchens and bathrooms, special features), checked against a local builder’s per-square-foot range for similar construction. If the two disagree widely, one of them is using wrong facts about your home, and renewal is the free moment to find out which. Owned solar panels fixed to the roof belong in that figure too; our solar panels and homeowners insurance guide shows how an 8 kW system moves the dwelling limit and the 80 percent line.

Step 2: Check the limit against the 80 percent line

The NAIC’s A Consumer’s Guide to Home Insurance gives the threshold every homeowner should know: if your dwelling coverage drops below 80 percent of the full replacement cost of your home, your insurance company may reduce the amount it will pay on a claim. That reduction is not limited to total losses; proportional settlement can reach partial claims too, which are the claims most people actually file. Do the one multiplication on your own figures: rebuild cost times 0.8 is your floor. A limit at or above the full rebuild cost is the guide’s recommendation; a limit between the floor and the full cost is a deliberate gap you are self-insuring; a limit below the floor risks reduced payments on top of the gap.

Step 3: Read off the limits that ride on Coverage A

Most of the other property limits on a standard policy are not chosen independently. They are expressed as percentages of the dwelling limit, which is why setting Coverage A right matters beyond the house itself. The NAIC guide’s typical limits table (Table 2, Limits of Coverage) reads:

Work the percentages once on a labeled hypothetical so the sizes are concrete. Take a rebuilding cost of $420,000 and set Coverage A at that full figure. The 80 percent floor is $336,000. Coverage B at the typical 10 percent is $42,000 for the detached garage, shed and fences. Coverage C at 50 percent is $210,000 for everything you own inside the home. Coverage D at 20 percent is $84,000 of additional living expense room if a covered loss puts you out of the house. Now drop Coverage A to $300,000 to save premium and watch the whole structure shrink with it: B falls to $30,000, C to $150,000, D to $60,000, and the limit sits below the $336,000 floor, so claim payments themselves may be reduced. The NAIC guide’s own example makes the same point at a smaller scale: a $150,000 dwelling limit at 50 percent gives $75,000 of personal property coverage. One decision, four consequences.

Step 4: Choose the two limits that are yours

Coverage E (personal liability) and Coverage F (medical payments) do not follow the dwelling limit; the NAIC table lists both as you choose. Liability is the limit that responds when you are sued over an injury or damage to someone else, and it protects assets and future income rather than the house. Weigh it against what you own and what you earn, not against the rebuild figure, and if your exposure runs past what a home policy offers, our umbrella insurance guide explains the layer that sits above Coverage E and your auto limits, including the underlying limits insurers require first. Medical payments is the smaller, no-fault limit for guests hurt on your property; it is usually chosen in the low thousands and rarely drives the premium.

Put the worksheet together on your declarations page

Take out your declarations page and fill the four lines: rebuilding estimate, dwelling limit as a percentage of it, the B, C and D limits as printed (not as assumed), and the E and F limits you chose. Our declarations page guide decodes each line in order, including the five mismatches to check. Two findings need a phone call before renewal: a dwelling limit under the 80 percent line, and printed percentages that differ from what you were sold. A third finding, a contents limit that no longer matches what you own, is what our scheduled personal property guide is for: the special limits inside Coverage C cap jewelry, firearms and collectibles far below the headline figure. Then carry the corrected spec into renewal shopping with the quote comparison worksheet, so each quote is priced on the same limits you just set.

Cross-check the estimate with the square-foot method

Insurer estimates arrive as a single number, and a single number is hard to argue with. The square-foot method gives you a second, independent route to the same answer so the two can be compared. Get a local builder’s rough rebuilding range per square foot for homes like yours, similar construction, similar finish level, and multiply it by your home’s living area. On labeled hypothetical figures that match the worked example above: a builder’s range centered on $210 per square foot across 2,000 square feet lands at $420,000, the same rebuilding cost the worksheet started from. When your two routes land near each other, you have a defensible figure. When they disagree by a wide margin, the disagreement itself is the finding: the insurer’s estimate may be counting a finished basement you do not have, or missing the addition you built, or pricing a standard kitchen where yours is custom, and each of those is a specific, fixable input rather than an argument about the total.

Know what the method cannot see. A per-square-foot figure averages a whole house, so it flattens exactly the features that make rebuilding expensive: vaulted ceilings, complex rooflines, masonry, custom millwork, and the second kitchen in a finished basement all cost more than the average foot, while a simple rectangular plan costs less. Treat the cross-check as a tripwire, not a verdict. If it trips, ask the insurer or agent to walk the estimate’s inputs line by line, square footage, construction class, roof shape and material, interior finish grade, and correct the inputs that describe somebody else’s house. The same conversation serves you in both directions: an estimate built on features your home does not have is premium paid every year on a rebuild that will never happen, and the NAIC guide’s instruction to review the dwelling coverage from time to time is, in practice, this review of inputs.

Two limits beside the dwelling figure deserve their own check. Code upgrades after a loss are paid from a separate ordinance or law limit, if the policy has one at all. And liability should be sized against the largest realistic claim; a dog bite claim averaged $65,450 in 2025, per the Insurance Information Institute.

When the right answer changes

Three events move the number. A renovation raises rebuilding cost while the limit stays at the old figure; our renovation guide works that gap in full. Labor and material inflation moves rebuilding cost quietly between renewals, which is why many policies carry inflation guard adjustments worth reading rather than trusting blindly. And a change in the property itself, a finished basement, a converted garage, an added bathroom, changes the estimate inputs. Recheck the worksheet at every renewal with fresh eyes; the arithmetic takes minutes, and the 80 percent line does not send a warning when you drift under it.

Common questions

The same worksheet matters at payoff, when a lender no longer sets the limit; the payoff guide lists the coverage choices to revisit.