A common and costly mistake in homeowners insurance is setting dwelling coverage based on a home's market value or purchase price, rather than what it would actually cost to rebuild it. These numbers can diverge significantly, and insuring to the wrong one either wastes money or leaves you underinsured.
Why market value and rebuild cost differ
Market value includes the land, which doesn't burn down or need rebuilding, and reflects whatever buyers are currently willing to pay in a given local market — a figure driven by supply, demand, and location as much as the physical structure. Rebuild cost, by contrast, is based purely on current local construction costs: labor, materials, and the specific features of your home, multiplied by square footage and adjusted for quality level.
How rebuild cost is typically estimated
Insurers and appraisers commonly use a cost-per-square-foot estimate for your specific region, adjusted for the home's age, materials, architectural complexity, and any custom features, then add costs for site-specific factors like debris removal and code-upgrade requirements (older homes often need upgrades to meet current building codes during a rebuild, which standard coverage may not fully address without an endorsement).
Why this number needs regular updates
Construction costs shift over time, sometimes significantly — material price swings, labor shortages, and general inflation can all move rebuild costs faster than a policy's coverage limit updates automatically. A policy insured to an accurate figure five years ago can be meaningfully underinsured today if it hasn't been revisited.
What to do
Ask your insurer or an independent appraiser for a current rebuild-cost estimate specifically (not a market value estimate), and revisit it every couple of years or after any major renovation. See also our breakdown of replacement cost vs. actual cash value, which affects how any payout is actually calculated.