Why Your Home Might Be Underinsured — and How to Fix It

If your home burned to the ground tomorrow, would your insurance pay enough to rebuild it? For most California homeowners, the honest answer is no. Studies consistently show that 60 to 70 percent of American homes are underinsured — meaning the dwelling limit on the policy is less than what it would actually cost to rebuild. In California, where construction costs are among the highest in the nation, the gap can be staggering.

Why Replacement Cost Calculators Get It Wrong

When you bought your policy, your agent likely used a replacement cost calculator — software like Marshall & Swift, CoreLogic, or 360Value — to estimate what your home would cost to rebuild. These tools ask basic questions: square footage, year built, number of bathrooms, type of roof. They produce a number. That number is almost always too low.

Here is why. These calculators use average construction costs across broad geographic areas. They do not account for your specific lot conditions (slope, access, soil type). They underweight custom features. They use historical cost data that lags the market. And they rarely factor in what actually happens after a catastrophe: demand surge. When thousands of homes need rebuilding simultaneously, labor and materials costs spike 20 to 50 percent above normal market rates.

Construction Costs Have Exploded

Between 2020 and 2025, construction costs in California rose 40 to 60 percent depending on the region and the type of construction. Lumber prices, while off their pandemic peaks, remain elevated. Labor shortages persist in the skilled trades — framers, electricians, plumbers, HVAC technicians. Code requirements have increased (energy efficiency, fire hardening, seismic upgrades). Every one of these factors increases what it costs to build a home.

If your policy limit has not increased by 40 to 60 percent in that same period, you are likely underinsured. The typical inflation guard endorsement adds 3 to 5 percent per year. That means your limit has grown roughly 15 to 25 percent since 2020 — well short of actual cost increases.

Why Inflation Guard Is Not Enough

The inflation guard endorsement automatically increases your dwelling limit by a fixed percentage each year — typically 3 to 5 percent. It is better than nothing. But it was designed for eras of modest, predictable inflation. It cannot keep pace with the kind of rapid cost increases California has experienced. It also does not account for demand surge, code upgrades, or the specific cost realities of your particular home and location.

Extended Replacement Cost

An extended replacement cost endorsement pays a specified percentage above your dwelling limit if the actual rebuild cost exceeds your coverage. Common options are 25 percent or 50 percent above the stated limit. If your dwelling limit is $600,000 and you have a 50 percent extended replacement cost endorsement, the insurer will pay up to $900,000 to rebuild your home.

This is a critical safety net. It is not a substitute for having an accurate dwelling limit, but it provides a buffer against unexpected cost increases and demand surge. If your insurer offers it, buy it.

Guaranteed Replacement Cost

Guaranteed replacement cost is the gold standard. With this endorsement, the insurer agrees to pay whatever it actually costs to rebuild your home — regardless of your stated dwelling limit. There is no cap. If your limit is $600,000 but the rebuild costs $850,000, the insurer pays $850,000.

Guaranteed replacement cost has become extremely rare in California. Most major insurers stopped offering it after the 2017-2018 wildfire seasons exposed how dramatically they had underestimated rebuild costs. If you have it, do not give it up. If you can find it, buy it. For a detailed comparison, see our article on replacement cost vs. guaranteed replacement cost.

How to Get a Real Rebuild Estimate

An independent estimate from a licensed general contractor who builds homes in the area is usually more accurate than the calculator the agent or carrier used at issuance. A common question to ask the contractor is something like: “If this home was destroyed and you had to rebuild it from the foundation up, with current code compliance, what would it cost?” Many policyholders ask for that estimate in writing.

The estimate should include:

• Site preparation and debris removal
• Foundation (including any required soil engineering)
• Framing, roofing, siding, and all structural components
• Plumbing, electrical, and HVAC systems
• Interior finishes — flooring, cabinets, countertops, fixtures
• Current building code requirements (Title 24 energy, fire hardening, seismic)
• Permits and architectural/engineering fees
• General contractor overhead and profit (10% overhead + 10% profit is the carrier-recognized baseline of approximately 20%; total rebuilds often run higher in practice)

The Consequences of Being Underinsured

If your dwelling limit is less than the actual rebuild cost, you face one of two outcomes after a total loss:

1. You pay the gap out of pocket. If rebuilding costs $800,000 and your limit is $600,000, you need $200,000 from somewhere else — savings, a loan, or selling the lot.
2. You build a smaller or cheaper home. You downgrade materials, reduce square footage, or eliminate features to fit within the policy limit.

For partial losses on commercial or certain specialty policies, being underinsured can trigger a coinsurance penalty — a formula that reduces the payout proportionally, even when the loss is well within the policy limit. (Standard California residential HO-3 policies typically do not have a true coinsurance clause; the analogous residential mechanism is the Loss Settlement Condition.)

How to Fix It

You might consider working through the following steps:

1. Get a contractor's rebuild estimate for the home.
2. Compare it to the current Dwelling limit on the declarations page.
3. If the estimate exceeds the limit, contact the agent and request an increase.
4. Ask about extended replacement cost (typically 25% or 50% above limit) where guaranteed-replacement-cost endorsements are unavailable.
5. Check that the Other Structures, Personal Property, and Loss of Use limits are proportionally adequate.
6. Confirm there is ordinance-or-law coverage in place for code upgrades.
7. Set a calendar reminder to repeat this review annually.

The Market Reality

California's insurance market is in crisis. Carriers are leaving the state, limiting coverage, and raising premiums. In this environment, getting adequate coverage is harder and more expensive than it used to be. But being underinsured is not a solution — it is just a different kind of risk. You are paying premiums for protection that will not actually protect you. Either get adequate coverage or understand — clearly, with open eyes — exactly how much of the rebuild cost you are self-insuring.

For more on what your homeowner policy covers and where the gaps typically hide, review your full policy and understand what you are buying. The time to discover you are underinsured is today — not the day after a fire.

This article is for informational purposes only and does not constitute legal advice. Insurance policies and applicable law vary by state and by policy form. Consult with a licensed professional regarding your specific situation.

Written by Leland Coontz III, Licensed Public Adjuster, CA License #2B53445.