How much dwelling coverage you need (it's not your home's price)

The single most consequential number on a homeowners policy is the dwelling coverage limit — the maximum the insurer will pay to rebuild your house. Most people assume it should equal what they paid for the home or what it would sell for today. Both are wrong, often dangerously so, because market value and rebuild cost are different numbers that move independently. Getting this figure right is the difference between a fully funded rebuild and a five- or six-figure shortfall at the worst possible time.

Rebuild cost, not market value

Market value includes the land, the neighborhood, and the school district — none of which burn down. Rebuild cost (replacement cost) is purely the cost of labor and materials to reconstruct the structure. In a hot market with expensive land, rebuild cost can be far below market value — leading people to over-insure. But after a regional disaster, or in an area with cheap land and expensive construction, rebuild cost can exceed market value — and that's where underinsurance ruins people. The insurer estimates this figure, but their default calculators are often low; a firm number comes from a replacement-cost appraisal or a detailed calculation with your agent.

The layers above your base limit

• Extended replacement cost: pays 25-50% above your dwelling limit if construction costs spike (common after a regional disaster drives up labor and materials). Cheap, and the endorsement that saves underinsured homes after wildfires and hurricanes.
• Guaranteed replacement cost: rebuilds your home no matter the cost, even beyond your stated limit — the strongest protection, offered by fewer carriers.
• Inflation guard: automatically nudges your dwelling limit up each year to track construction inflation, so the figure doesn't quietly fall behind.
• Ordinance or law: pays the extra cost of rebuilding to current building codes, which a base policy excludes — important for older homes.

How to get the number right

1. Ask your insurer how they calculated your current dwelling limit, and whether it's a detailed replacement-cost estimate or a rough default.
2. For an accurate figure, get a replacement-cost appraisal or use a detailed cost estimator that accounts for your home's size, materials, and finishes.
3. Add extended replacement cost (25-50%) as a buffer against construction-cost spikes.
4. Turn on inflation guard so the limit tracks rising costs automatically.
5. Re-check after any major renovation — an addition or a kitchen remodel raises your rebuild cost and can push you below the 80% threshold if you don't update the limit.

The bottom line

Your dwelling limit should reflect what it costs to rebuild your house, not what it would sell for — two numbers that can differ by a lot in either direction. Insure to full replacement cost, keep clear of the 80% coinsurance trap, and add extended replacement cost plus inflation guard so a regional cost spike doesn't leave you short. This is not a set-and-forget figure: renovations and construction inflation both move it, and the annual review is where you catch the drift before a fire does.