March 13, 2026
By now, you’ve learned what real estate insurance is (Part 1), the types of policies available (Part 2), and 14 essential terms you’ll encounter when dealing with real estate insurance (Part 3).
Now that you've got the core terminology down, it's time to put it to work. And one of the first real decisions you'll face as a new investor is one that trips a lot of people up: how much coverage should you actually buy? It sounds like it should be simple. It's not. But once you understand the core concept, it clicks pretty fast.
When people buy their first investment property, they tend to insure it for what they paid for it. You bought a building for $500,000, so you insure it for $500,000. Feels logical.
But remember: replacement cost has nothing to do with what you paid. It's what it would cost to rebuild the structure from scratch at today's prices. And that number can be very different from your purchase price.
Your property's market value includes everything: the land, the location, the neighborhood, nearby amenities, school districts, and current demand. It's what a buyer would pay for the whole package.
But your insurance only needs to cover the cost of rebuilding the structure itself. Not the land. Not the location. Just the physical building. And here's why that matters: land cannot be destroyed. If your building burns to the ground, the lot is still sitting there. Your insurer has no reason to pay you for something that wasn't lost.
So let's say you own a rental property with a market value of $800,000. You might think that's your coverage number. But let's break it down. The land is worth $300,000. The structure would cost $350,000 to rebuild. That adds up to $650,000, which means your dwelling coverage should be based on the $350,000 it would take to rebuild the structure, not the $800,000 market value.
If you insured for the full $800,000, you'd be paying premiums on $450,000 worth of coverage you could never collect. That $450,000 is the difference between $800,000 and $350,000—the portion of your market value that represents the land and other factors insurance simply doesn't cover.
The reverse is just as dangerous. In markets where construction costs are high, your rebuild cost might actually exceed what you paid. Underinsure, and you'll pay the difference out of pocket when it matters most.
You already know what coinsurance is from Part 3. Now let's see what it actually looks like when it goes wrong.
Here's the scenario:
Your property has a replacement cost of $350,000. Your policy includes an 80% coinsurance requirement. That means you're required to carry at least $280,000 in coverage (that's $350,000 x 80%). But to keep your premiums low, you only insured the property for $175,000. A fire then causes $100,000 in damage.
You'd expect your insurer to just cut you a check for $100,000, right? Not so fast. Your insurer first checks whether you met the coinsurance requirement. You were supposed to carry $280,000 in coverage but only carried $175,000. That means you only covered 62.5% of what was required ($175,000 divided by $280,000).
So instead of paying the full $100,000 claim, they pay only 62.5% of it. That comes out to $62,500. The remaining $37,500 comes out of your pocket, even though you had insurance.
That's the coinsurance trap. The penalty isn't just for total losses. It applies to every claim, including small ones, any time you're underinsured. Getting your coverage amount right from the start is the only way to avoid it.
You have a few options, depending on how precise you want to be.
The simplest starting point is a cost-per-square-foot estimate. Local construction cost data can give you a rough rebuild cost per square foot for your market. Multiply that by your property's square footage and you have a working ballpark. Just make sure you're using local figures, because costs vary a lot by region.
A more reliable option is a replacement cost estimator from your insurance broker. Most insurers have tools that factor in your property's size, age, construction type, and local labor costs to generate a recommended coverage number. Ask your broker to run one before you finalize your policy.
For larger or more complex properties, a professional appraisal focused specifically on replacement cost is worth the investment. It gives you and your insurer a defensible, agreed-upon number from the start.
Dwelling coverage is the big one, but your policy limit decisions don't stop there.
Your liability coverage limit deserves just as much attention. If a tenant or visitor gets hurt on your property and sues, this is what protects you. A $100,000 limit can disappear fast in a serious lawsuit. Most experienced investors carry at least $300,000 to $500,000 per property, and many add an umbrella policy on top for broader protection.
Your loss of rental income coverage should reflect your actual rent, not a round number you picked at random. Check how many months the policy covers too. Six months might not be enough if your property suffers major structural damage and repairs drag on.
If your rental is furnished or you supply appliances, add up the real replacement cost of everything inside. That's your personal property coverage number.
Construction costs have climbed significantly in recent years, which means the replacement cost of your property today is probably higher than when you first bought your policy. A coverage amount that was accurate two years ago might leave you underinsured right now.
Make it a habit to review your coverage annually, especially after renovations. Some policies include an inflation guard endorsement that adjusts your coverage amount automatically each year. Ask your broker if that's available on your policy.
Getting your coverage amounts right isn't the most exciting part of being an investor. But it's one of the most important things you can do to make sure your policy actually delivers when you need it.
Next up in the Real Estate Insurance 101 series: How to Read a Policy Without Falling Asleep, where we'll walk through what's actually in a standard policy document and show you exactly what to look for before you sign.
Disclaimer: This content is meant for informational purposes only and is not intended to be construed as financial, tax, legal, or insurance advice.
