Guides
Construction cost inflation and your property limits
How rising rebuilding costs create underinsurance, the 2026 cost indexes to watch (Verisk 360Value, BLS PPI) and how coinsurance and agreed value respond.
When rebuilding costs rise faster than your building limit, you become underinsured without changing a thing. Under a coinsurance clause, that shortfall turns into a reduced claim payment even on a partial loss. Check your building and equipment limits against current reconstruction costs every year, not at inception only, and ask whether an agreed value or inflation guard option fits your policy.
What the 2026 data say
Three public series measure different things, and they point in different directions.
Verisk 360Value (reconstruction cost). Verisk's 360Value Quarterly Reconstruction Cost Analysis for Q3 2026 measures changes from July 2025 to July 2026, built from Verisk's Xactimate cost research. It reported:
- total U.S. reconstruction costs (materials and retail labor) up 4.0%, versus 4.2% for July 2024 to July 2025;
- commercial reconstruction costs up 4.1% year over year and 1.08% from April to July 2026, with Rhode Island (6.85%), Oklahoma (6.57%) and Iowa (5.79%) the largest state increases;
- combined labor rates up 4.7%, more than double the 2.05% increase in materials. Verisk called labor "the primary driver" of reconstruction cost inflation.
Verisk publishes the report quarterly, so check the newest edition at renewal.
BLS Producer Price Index, inputs to construction industries. The Bureau of Labor Statistics PPI tracks what contractors pay for materials and energy. Associated Builders and Contractors (ABC), analyzing BLS data in a September 10, 2026 release, reported that overall construction input prices rose 1.2% in August 2026 and were 8.9% higher than a year earlier, with nonresidential construction input prices up 1.2% for the month and 8.8% year over year. ABC attributed the rise to broad materials increases, including iron and steel, softwood lumber, switchgear and copper wire and cable, plus energy, citing the trade dispute with Canada and oil prices above $100 a barrel. The BLS publishes the next PPI release on October 15, 2026.
Turner Building Cost Index. Turner Construction's index of nonresidential building costs rose 8.0% in 2022, 6.0% in 2023, 3.9% in 2024 and 4.1% in 2025 on an annual average basis (turnerconstruction.com/cost-index).
Why do the series differ? The PPI measures input prices at the producer level and moves with commodities and energy. Verisk measures the installed cost of repairing and rebuilding, which includes labor and local pricing and which moves more slowly. Contractor margins and bid prices lag input costs. None of them is your building's cost. They tell you the direction and the order of magnitude; your own valuation tells you the number. Tariffs, energy prices and labor shortages can reverse quickly, so reread the latest releases before renewal.
How inflation becomes a claim problem
Underinsurance usually builds quietly.
- A building is insured at $2.0 million when it is valued at inception.
- Three years of cost increases of 4% a year raise the true replacement cost to about $2.25 million. (Hypothetical arithmetic: 1.04 cubed is about 1.125.)
- If the policy has an 80% coinsurance clause, the required limit is $1.8 million, so the owner still meets it.
- Then costs jump, or the owner adds a mezzanine and does not report it. If the required limit climbs past $2.0 million, a partial loss pays only the proportion of the loss that the limit carried bears to the limit required.
Under the ISO coinsurance formula, the payment equals the loss times the limit carried divided by the limit required, less the deductible. See the coinsurance clause and how underinsurance is penalized and run numbers with the coinsurance penalty calculator. Even with no penalty, a total loss is paid up to the limit, so an inadequate limit leaves you short of the rebuild.
Equipment, tenant improvements and stock follow separate price paths. Machinery and electrical gear can move faster than a shell building, and tenants insure their own betterments (see tenant improvements).
Property policy features that interact with cost inflation
| Feature | What it does | Watch for |
|---|---|---|
| Replacement cost valuation | Pays to repair or replace with like kind and quality, without depreciation | Usually paid only when repairs are made; see replacement cost vs actual cash value for business property |
| Coinsurance (often 80%, 90% or 100%) | Penalizes limits below a percentage of value | Penalty applies to partial losses |
Agreed value (optional coverage on CP 00 10) | Suspends coinsurance for the policy period based on a signed statement of values | Values must be current; carriers often require a new signed statement each term |
Inflation guard (optional coverage on CP 00 10) | Raises the limit by a stated annual percentage, pro rata | The percentage is fixed on the declarations and may lag actual costs |
| Blanket limits | One limit across several buildings | A margin clause can cap what any one building recovers |
Ordinance or law (CP 04 05) | Pays for undamaged-portion loss, demolition and increased construction cost | Code upgrades can add materially to a rebuild |
Ask your broker whether the policy has an inflation guard percentage and whether it is above or below recent cost changes. Agreed value is not a license to ignore valuation: the limit still pays no more than the limit, and the agreement rests on the values you certify. See agreed value, blanket limits and margin clauses.
A valuation routine
- Start with a real valuation. Use a replacement cost estimate from your carrier's valuation tool or an independent appraiser, not the purchase price or tax assessment, which reflect land and market value. The building's insurable value excludes land and foundations that would not be rebuilt, depending on the form.
- Update annually. Trend values by an index appropriate to your building type (commercial reconstruction cost, regional factors), then compare with the limit. Document the method on your the statement of values: what property underwriters need.
- Update when you change something. Renovation, a new roof, new equipment or a use change can add value far above the trend.
- Account for code. Add ordinance or law limits for older buildings; see ordinance or law coverage: paying for code upgrades after a loss.
- Include time. Longer rebuilds raise business income exposure. See how to calculate a business income limit and the business income (interruption) limit calculator.
- Review catastrophe demand surge. After a regional event, labor and material prices spike. Standard forms don't add a specific surge allowance, so limits need cushion in cat-exposed regions.
- Ask the lender. Mortgage lenders often require replacement cost coverage at a stated limit.
A hypothetical example
Say a light-manufacturing building in Oklahoma is insured for $3.0 million with 90% coinsurance and no agreed value. A fresh valuation puts the replacement cost at $3.9 million. The required limit is 90% of that, $3.51 million. A $500,000 partial fire loss, with a $10,000 deductible, would pay: $500,000 times ($3.0 million divided by $3.51 million), which is about $427,350, less $10,000, about $417,350. The owner absorbs the roughly $82,650 difference. The figures are invented to show the formula.
Key takeaways
- Rebuilding costs rise on their own schedule. Verisk's 360Value showed commercial reconstruction up 4.1% from July 2025 to July 2026, while ABC's analysis of BLS data put construction input prices up 8.9% year over year in August 2026.
- Coinsurance turns outdated values into a reduced payment on partial losses.
- Agreed value and inflation guard help, but only if the values and percentages are current.
- Revalue every year and after any improvement, and add ordinance or law coverage for older buildings.