Home replacement cost calculator

Your home’s replacement cost is what it would take to rebuild it from the ground up at today’s prices. It’s the single number your dwelling coverage should be based on, and it’s the number most homeowners get wrong.

That number matters because dwelling coverage is a ceiling, not a promise. If your policy covers $225,000 and rebuilding actually costs $300,000, the remaining $75,000 comes out of your pocket. 

And that gap is common — when the Marshall Fire destroyed nearly 1,000 Colorado homes, 74% of policyholders who filed claims were underinsured. Those homeowners weren’t just short on cash. They were far less likely to rebuild at all, and roughly twice as likely to sell the lot and walk away.

Use the calculator below to get a starting estimate, then compare it against the dwelling coverage limit on your current policy.

How to estimate the replacement cost of a home

Two numbers get you a working estimate — how big your home is, and what it costs to build in your area right now. Here’s the formula:

Square footage × local rebuild cost per square foot = replacement cost

So for a 1,500-square-foot home in an area where rebuilding runs $150 per square foot, that’s 1,500 × $150, or an estimated $225,000 to rebuild.

Your local rebuild cost is what contractors in your area charge for labor and materials, not what your home would sell for. You can get it from your insurance agent, a local general contractor, your county assessor’s office, or a free tool like Cost To Build.

The formula is fast and free, but it’s a ballpark. It won’t account for your foundation type, custom finishes, or an unusual floor plan.

Three ways to estimate your home’s replacement cost, from roughest to most accurate

An appraiser inspects your home in person and prices out the specific materials and construction it would take to replace it. It’s the most expensive option and the one worth paying for if your home is unusual, historic, or recently renovated.

What is replacement cost, exactly?

Replacement cost is the dollar amount it would take to rebuild your home to its previous condition after it’s destroyed, priced at today’s construction costs rather than what you paid when you bought it.

This figure sets your dwelling coverage, the part of your homeowners policy that covers your home’s physical structure.

How replacement cost compares to market value

Replacement cost is what it would take to rebuild your home’s structure. Market value is what a buyer would pay for the property, including the land. The two rarely match — in expensive markets, replacement cost is often lower because so much of the price is the land, while in rural areas or after a construction cost spike, it can run higher.

What affects your rebuild cost?

Two homes with identical square footage can have very different replacement costs. The main drivers are below.

• Square footage. Costs scale almost directly with size, so a house twice as large costs roughly twice as much to rebuild. Finished basements and converted attics count.
• Local construction and labor costs. The same house costs far more to rebuild in a high-wage metro than a rural market, and costs surge regionally after a disaster when everyone needs a builder at once.
• Building codes. A rebuild has to meet today’s code, not the code your house was built under. Older homes often need updated wiring, insulation, or fire-resistant roofing, and standard policies don’t always pay the difference, which is what building code coverage is for.
• Interior and exterior materials. Insurers estimate using standard finishes unless you tell them otherwise. Stone counters, custom millwork, and slate roofing cost several times their builder-grade equivalents.
• Foundation type. A slab is cheapest to replace. Basements, crawl spaces, and hillside foundations need excavation and structural work a flat pour doesn’t.
• Attached structures. Garages, decks, and porches count toward dwelling coverage. Detached ones like a shed fall under a separate limit, typically around 10%.
• Renovations. A remodel adds whatever a builder would charge to redo the work. A $40,000 kitchen may not add $40,000 in market value, but it adds close to that in rebuild cost.

How much dwelling coverage do you need?

Your dwelling coverage should match or exceed your replacement cost. That’s the whole rule. If you want to see how the math plays out on a specific size of house, we ran the numbers on dwelling coverage for a 2,500-square-foot home.

The amount you carry is your payout ceiling. With $500,000 in dwelling coverage, your insurer pays up to $500,000 to rebuild, no matter what construction actually costs that year. Anything above that limit is yours to cover.

How to protect yourself if your estimate falls short

Replacement cost coverage comes in three levels. Standard pays up to your dwelling limit, extended adds 25% or 50% above it, and guaranteed covers the full rebuild no matter the cost.

Note that extended and guaranteed coverage are added through an endorsement to your policy. Guaranteed replacement cost offers the strongest protection but isn’t available from every insurer or on every home.

What does your policy pay, actual cash value or replacement cost value?

Actual cash value (ACV) pays what your property is worth today after depreciation, while replacement cost value (RCV) pays what it costs to replace new, and on a single claim that difference can run into thousands of dollars. ACV deducts depreciation, so a ten-year-old roof pays out at ten-year-old value. RCV skips the deduction entirely. 

Most policies use RCV for your home’s structure but ACV for your belongings, which is why a settlement can feel adequate on the rebuild and thin on everything inside it.

When to recalculate your replacement cost

Review your replacement cost once a year, ideally before your policy renews. It’s also a good moment to compare quotes from the best home insurance companies. Rebuild costs shift with material and labor prices even when nothing about your house changes.

Your annual check-in

• Compare your current estimate against the dwelling limit on your policy
• Note any home improvements worth $5,000 or more
• Check last year’s property tax assessment for changes
• Look at whether local building codes have been updated

Recalculate now if any of these apply

• It’s been more than three years since your last review
• You’ve completed $50,000 or more in renovations, like a kitchen remodel, new roof, or addition
• You’ve added square footage, such as a bedroom, garage, deck, or finished basement
• Your home’s market value has jumped 10% or more

What replacement cost doesn’t cover

Replacement cost coverage pays to rebuild your home’s structure. It doesn’t cover your land, your home’s market value, or damage from excluded events like flooding, earthquakes, or neglect. Floods and earthquakes are the gaps most likely to catch homeowners off guard, and both require a separate policy.

Having insurance isn’t the same as having enough to rebuild

When the Marshall Fire swept through Boulder County at the end of 2021, it destroyed nearly 1,000 structures in a matter of hours. The families who lost homes weren’t uninsured or careless. They had policies, paid their premiums, and filed claims like anyone would. A 2025 study from the Federal Reserve Bank of Philadelphia tracked what happened next.

• Average dwelling coverage among 3,000 policyholders was $591,100
• The average rebuild actually cost $757,100
• That left a typical shortfall of roughly $166,000 per household
• Rebuilding ran $350 per square foot
• Three in four homeowners were underinsured
• More than a year later, only 30% had filed a rebuilding permit

Costs climbed because labor and materials spike after a disaster, when every homeowner in a region needs a contractor at once. That isn’t specific to Colorado or to wildfire. The same crunch follows hurricanes, tornadoes, and floods anywhere they hit at scale, and it lands hardest on the people who set their coverage years earlier and never revisited it.

The homeowners who came up short were far less likely to rebuild and roughly twice as likely to sell the lot and move on. Rechecking your replacement cost once a year and padding it by about 15% is very little work set against that.

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