The kitchen cost $180,000. The market paid for about a third of it. That gap has a name in appraisal practice: superadequacy. It is the over-improvement, the feature built to a level the neighborhood does not support. In estate planning it shows up constantly, because families improve homes for themselves over thirty years. Then they value them by what was spent. The estate tax regulations, the trust documents, and the siblings at the table all need a different number.
- What superadequacy actually means, and why long-held family homes are full of it
- Why contractor invoices, insurance replacement cost, and the tax assessment are not fair market value, and which regulation says so
- How an appraiser treats an over-improved property, and what executors should gather before the inspection
What Superadequacy Means, and Why Estate Files Are Full of It
The Dictionary of Real Estate Appraisal defines superadequacy as an excess in the capacity or quality of a structure or component, judged by market standards. So it is a form of functional obsolescence, not a bonus. The classic examples are the twelve-car garage in a market of three-car garages, or a 5,000 square foot house on a block of mid-century ranches.
The principle behind it is contribution. An improvement is worth what it adds to the value of the whole property, not what it cost to build. But that is not how families remember it. A $180,000 kitchen in a neighborhood where houses sell between $450,000 and $550,000 does not add $180,000. Buyers at that price point will not pay for it. So the market discounts it.
Estate files attract this problem for a simple reason. People who live in one house for decades improve it for their own use. The addition for the grandchildren, the elevator, the commercial-grade range, the finished basement with a second kitchen. None of it was built with a resale buyer in mind. Then the owner dies, and the family remembers every invoice.
Cost Is Not Value, and the Estate Tax Regulations Say So
For federal estate tax, property is included at fair market value on the date of death (or the alternate valuation date if the executor elects it). The regulation at 26 CFR 20.2031-1(b) defines that as the price a willing buyer would pay a willing seller, neither under compulsion, both reasonably informed. It adds that value is not a forced-sale price. It also says property may not be returned at its local tax-assessed value unless that figure happens to equal fair market value.
Read that against the records most estates hand over. Contractor invoices measure cost. The homeowner’s insurance policy carries replacement cost. That is what it would take to rebuild, not what a buyer would pay. The Cook County assessment is a mass-appraisal estimate the regulation specifically declines to accept on its own. None of these is the number the return asks for.
The same willing-buyer standard governs lifetime gifts. So when a parent deeds the over-improved lake house to one child, the gift value is what the market would pay for it, superadequacy and all. Whether that produces a reportable gift, and how basis carries, are questions for the CPA and the attorney. The appraiser’s job is to get the value right so those questions have a sound starting point.
Where the Over-Improvement Bites
Beneficiary equalization is where it hurts first. Suppose a will leaves the house to one sibling and cash to the other two. The intent is that everyone receives roughly equal value. If the estate carries the house at cost, the sibling taking the house is shortchanged. They receive an asset the market would not buy at that number. If the estate carries it at an old assessment, the reverse happens. Either way, someone has a grievance, and the executor is holding the pen.
Trust funding has the same exposure. A trust funded with real estate at an inflated number looks better on paper than it performs when the trustee eventually sells. Charitable planning is stricter still. A donation of real estate needs a qualified appraisal, and the appraiser must sign the form.
Then there is the return itself. An estate that reports a high value on an over-improved property is paying tax on value the market does not recognize. But the opposite error is worse. One that reports the assessment is inviting a question the regulation already answered. A supported appraisal, prepared for the estate and tied to the date of death, closes both doors. Our estate appraisal work is built for exactly that use.
How an Appraiser Handles a Superadequate Property
Two approaches do most of the work. In the cost approach, the appraiser estimates what it would cost to reproduce the improvements today. Then depreciation comes off, including a specific deduction for the superadequacy. The report shows the over-improvement, names it, and explains why it does not carry its cost into value.
In the sales comparison approach, the appraiser looks for what buyers actually paid for similar houses in the same market. If comparable sales with high-end kitchens sold for only modestly more than sales without them, then that difference is the adjustment, not the invoice. Often the honest answer is that the feature earns a small premium or none at all.
Chicago makes this vivid. A house in Lincolnwood or Skokie with a $400,000 renovation competes with other Lincolnwood and Skokie houses, not with Winnetka. The Cook County Assessor values residential property by statistical model at 10% of estimated market value, working from recorded characteristics. A renovation the model never saw does not move the assessment, and even when it does, the assessment is still not the estate’s number.
The report should say all of this in plain language. Counsel should be able to hand it to a skeptical beneficiary or an examiner, and the reasoning should hold without a phone call.
What Executors and Heirs Should Gather Before the Appraisal
If you are the executor or the child who ended up with the keys, three things help the appraiser and protect you. First, collect the improvement history: permits, invoices, and dates for anything major in the last fifteen years. But do not add them up and call the total value. Hand them over as a record of what was done and when.
Second, pull the current insurance declarations page and the most recent Cook County assessment notice. Both are useful context. Neither is the value, so do not average them with the invoices to get one. The appraiser reconciles the evidence; that is the service you are paying for.
Third, confirm the effective date with the attorney before ordering. Date of death, the alternate valuation date, or a gift date each produce a different report, so the date comes first. An appraisal to the wrong date is a document you pay for twice.
The Number That Keeps Siblings Speaking
Consider a hypothetical: a Wilmette house held for 34 years, with a two-story addition, a home elevator, and a kitchen the owner loved. The invoices total $610,000 over the years. The insurance replacement cost is higher still. The Assessor’s model, working from an older record, implies something lower than either. But none of those is what a buyer would pay in the current Wilmette market for that house with those features.
Order the appraisal early. Tie it to the date the attorney specifies, with the intended use stated as estate administration or gifting. Ask the appraiser to address the over-improvements directly rather than bury them in an adjustment grid. Then give the report to the CPA before the return is drafted, not after. The value question is the one that goes to the market. The tax and legal questions stay with the professionals who own them.
Is the Family Home Worth What Was Spent on It?
PahRoo prepares estate, trust, and gift appraisals across Chicago and the North Shore, tied to the date your matter requires and written to explain an over-improved property to a beneficiary or an examiner. Michael Hobbs, MAI, SRA, signs every report.
Frequently Asked Questions
What is superadequacy in an appraisal?
Superadequacy is an excess in the capacity or quality of a structure or component relative to what the market expects, as defined in the Dictionary of Real Estate Appraisal. It is a type of functional obsolescence. The improvement cost more than it contributes to market value.
Does an estate have to value the house at what the family spent on it?
No. For federal estate tax, 26 CFR 20.2031-1(b) requires fair market value on the applicable date: the price between a willing buyer and willing seller. Construction cost, insurance replacement cost, and the tax assessment are not that number.
Can the Cook County assessment be used on the estate tax return?
Only if it happens to equal fair market value on the valuation date. The regulation says property may not be returned at its local tax-assessed value otherwise. In Cook County the assessment is a mass-appraisal estimate, so an estate-purpose appraisal is the supported route.
How does an appraiser account for an over-improvement?
In the cost approach, by deducting functional depreciation for the superadequacy. In the sales comparison approach, by adjusting only for what comparable buyers actually paid for the feature, which is often much less than it cost. The report should explain both.
What should an executor give the appraiser?
The improvement history with permits, invoices, and dates; the insurance declarations page; the latest assessment notice; and the effective date confirmed by the attorney. Provide them as records, not as a value estimate.
Estate and Trust Appraisals From the North Side and the North Shore
From our Lincolnwood office, PahRoo appraises family homes, two-flats, and small commercial holdings for estate attorneys and CPAs throughout Chicago and Cook County. Our residential appraisals are written for estate administration, gifting, and trust funding, with the effective date and the treatment of any over-improvement stated plainly. When the estate includes income property, our commercial appraisal team handles it from the same office.
