You did not add a room. You did not finish the basement. You did not so much as repaint the trim. And yet your assessed value climbed. For thousands of Indiana property owners every cycle, the explanation is not a physical change at all — it is a quiet update to the cost schedules the Department of Local Government Finance (DLGF) publishes for assessors.
The DLGF released updated cost schedules for the January 1, 2026 assessment date. Those changes will flow into the bills payable in 2027. (The bills you received this spring were driven by the 2025 assessment date.) Understanding this mechanism is the difference between accepting a number you do not owe and filing a clean, evidence-backed appeal.
What a Cost Schedule Actually Is
Indiana assessors value most improvements — houses, garages, pole barns, commercial buildings — using the cost approach. The idea is simple: estimate what it would cost to replace the structure new today, then subtract depreciation for age and condition.
The "cost to replace new" half of that equation does not come from the assessor's gut. It comes from standardized tables the DLGF maintains: dollar-per-square-foot figures for framing, roofing, plumbing, HVAC, finishes, and dozens of other components. These are the cost schedules (often called cost tables).
When construction prices rise statewide, the DLGF periodically resets those tables upward so that assessed values track real-world building costs. That reset is exactly what landed for the 2026 assessment date.
The two forces moving your value
Two distinct mechanisms push assessed values around, and it helps to separate them:
| Mechanism | What it does | How often |
|---|---|---|
| Cost-schedule reset | Updates replacement-cost dollars per unit | Periodically, by DLGF rule |
| Annual trending | Adjusts values toward recent market sales | Every year |
A cost-schedule reset changes the baseline of what your structure is presumed to cost to rebuild. Annual trending then nudges the result toward what comparable properties are actually selling for. Both can move your number even when the property itself is frozen in time.
Why a Reset Hits Unchanged Properties
This is the part owners find counterintuitive. If the schedules say a square foot of mid-grade residential framing now costs more to replace, then every property built with that framing gets revalued upward — regardless of whether anyone touched it.
A cost-table reset is one of the most common reasons an assessment moves with no physical change to the parcel. It is not an error and it is not arbitrary. It is the system doing what it was designed to do: keep replacement-cost math current.
That does not mean the new number is automatically correct for your property, however.
Warning
A statewide cost-schedule update is applied broadly. It cannot account for the cracked foundation in your crawlspace, the functionally obsolete floor plan, or the fact that your roof is 25 years old. When a uniform reset overshoots the real condition of your specific structure, that gap is precisely what an appeal targets.
When a Reset Overshoots and Becomes Appealable
A reset becomes appealable when the resulting assessed value exceeds what the property would actually sell for, or when the cost approach was applied with the wrong inputs. Common over-shoot scenarios:
- Wrong grade or quality classification. If the schedules treat your home as a higher construction grade than it really is, the reset multiplies that error.
- Stale depreciation. Replacement cost may rise, but if the assessor did not also account for your structure's true age and wear, the depreciation offset is too small.
- Cost above market. The cost approach can produce a value higher than recent sales of comparable homes. In Indiana, the sales-comparison evidence generally controls when it points lower.
- Mismeasurement or phantom features. A reset amplifies any square-footage or feature error already baked into the record card.
For background on how broad these swings have become, see our coverage of 12% assessed-value growth in 2025.
What to Check on Your Record
Before you decide whether to appeal, pull your property record card and confirm the inputs the cost approach relied on:
- Living area / square footage — measure or verify against your own records.
- Construction grade and quality — is it consistent with similar homes nearby?
- Year built and effective age — depreciation should reflect real condition.
- Listed features — fireplaces, finished basements, decks, outbuildings.
- Land value — separate from improvements; confirm it is reasonable for your lot.
Your county's assessment notice — the Form 11 — is the document that opens your appeal window. Do not let it sit.
How the Appeal Works
If the reset pushed you above market, the strongest counter is comparable sales. Pull recent arm's-length sales of similar properties and show the board your assessed value sits above what the market actually paid. We walk through assembling that package in our guide to comparable sales evidence for PTABOA appeals, and the full procedure lives in the 2026 appeal guide.
You can also confirm how the cost tables changed at the source. The DLGF maintains its rules and schedules through its official site, and a summary of the 2026 cost-table changes is published by DMA.
Find Your Property
Want to see how your assessment compares to your neighbors before you appeal? Start with our Indiana property explorer or jump straight to a county like Marion County to view parcel-level data.
Our property lookup tool surfaces your assessed value, classification, and comparable sales in one place. If the cost-schedule reset overshot your property, our tax appeal service builds the evidence package and files on your behalf.
For the official rules behind the schedules, the DLGF is the authoritative source.