Run two valuations side by side and compare the nets, because a Wilmette property is worth more as land whenever the lot value under the next house exceeds what the existing house can net from a household sale. The research gives owners both sides of that test. On the land side, a simplified residual illustration for 60091 takes a 2,300,000 dollar new build sale, subtracts roughly 950,000 dollars of construction cost and a builder margin near 20 percent, and leaves 890,000 to 980,000 dollars for the land before site preparation of 30,000 to 45,000 dollars. On the house side, sampled older Wilmette homes traded at an average of 27.5 percent of new build prices on comparable lots, roughly 633,000 dollars against that same 2,300,000 dollar example, and builders acquired all 12 pre 1981 homes in the sample, a 100.0 percent rate carried here with its small sample caveat (Frontier Capitals, 2026). When the residual for a specific lot sits at or above the likely household net, after commission, closing costs, concessions and months of taxes are charged against the household figure, the property is telling its owner that the land is the asset. This report sets out the test in steps any owner can follow with public records.
Key Findings
- The land test compares a residual figure for the lot with a net figure for the house, and the research supplies both: 890,000 to 980,000 dollars of residual under a 2,300,000 dollar build, before preparation, against an average older home trade near 633,000 dollars at the 27.5 percent sample ratio (Frontier Capitals, 2026).
- Builders acquired 12 of 12 sampled pre 1981 Wilmette homes, which means the land reading won every sampled contest in the oldest segment (Frontier Capitals, 2026).
- The household figure must be reduced by commission of 5 to 6 percent, seller closing costs of 1 to 2 percent, inspection concessions of 15,000 to 35,000 dollars and monthly taxes of 1,500 to nearly 3,000 dollars before it can be compared fairly.
- Lot width is the physical fact that most often decides the test, because at the 6,600 square foot sample minimum the width binds the buildable envelope and the finished price (Frontier Capitals, 2026).
- Parcel dimensions, zoning, assessed land values and recorded deeds are all public for 60091, so the entire test can be run from records without paying for an appraisal (Cook County Assessor, 2026; Cook County Recorder of Deeds, 2026).
What is the first step, valuing the house as a house?
Begin with the reading most owners already have in their heads and discipline it with records. A house value for a pre 1981 Wilmette home is what a household will pay to live in it, financed against comparable sales of similar existing homes. Sold listing records for the village separate older stock from new construction, and the distinction matters, because new homes on comparable lots have closed from 1,800,000 dollars to 2,900,000 dollars while older homes averaged only 27.5 percent of those figures in the sample (Redfin, 2026; Frontier Capitals, 2026). An owner who benchmarks a 1960s colonial against a finished 2025 build on the next street has answered the wrong question before starting.
Automated estimates deserve a warning at this step. Valuation pages blend nearby new construction into the figure for an older address, which can lend the house value it does not possess for a household buyer comparing real older alternatives (Zillow, 2026). County assessment records offer a steadier, if rougher, cross check, since they separate the assessed value of the land from the assessed value of the building on each parcel (Cook County, 2026). Where the county already assigns most of the parcel value to the land, the market is usually saying the same thing, and the owner should listen.
Then charge the house figure with its selling costs, because the test compares nets. Commission at the typical 5 to 6 percent takes 37,500 to 45,000 dollars on a 750,000 dollar sale (National Association of Realtors, 2025). Seller closing costs at 1 to 2 percent take more, and the pair commonly exceed 50,000 dollars at that level. Inspection concessions on older North Shore homes routinely run 15,000 to 35,000 dollars, and carrying the house through 60 to 120 plus days of market time at Wilmette tax levels of 18,000 to 35,000 dollars a year adds 1,500 to nearly 3,000 dollars a month. The research ledger lands a 750,000 dollar list price in the high 500,000s net after a normal cycle, before price reductions, and that net, not the list price, is the number the land figure must beat. The fuller proceeds method is set out in the report on how Wilmette homeowners determine a property value, which pairs naturally with the test here.
What is the second step, valuing the lot as a building site?
Now price the property the way its most systematic buyers price it. Find the finished evidence first: what have new homes actually closed for on comparable lots on or near the street, inside the recorded range of 1,800,000 dollars to 2,900,000 dollars (Redfin, 2026)? Choose the point in the range that the lot can honestly support, giving weight to street, lot width and proximity to the lake and the village center, the three factors the research names. Then run the residual exactly as the research illustration runs it, labeled a simplified model: finished price, minus roughly 950,000 dollars of hard and soft construction cost on the 2,300,000 dollar example, minus a margin near 20 percent, leaving 890,000 to 980,000 dollars, then subtract site preparation of 30,000 to 45,000 dollars for a working land figure in the mid 800,000s to mid 900,000s on that example. Owners with a higher finished point, toward 2,900,000 dollars, will land higher; owners at 1,800,000 dollars will land far lower, which is the point of running the steps rather than borrowing the example answer.
Physical facts discipline the finished point before the arithmetic starts. Pull the parcel dimensions and zoning from assessor records and compare the lot with the 6,600 square foot sample minimum (Cook County Assessor, 2026). At that minimum, width binds the envelope and the finished house shrinks, so the finished point should be chosen low. A wide, regular lot earns a higher point. Check the deed and easement record for anything that removes usable land (Cook County Recorder of Deeds, 2026). Check village permit history on the street to see what scale of house has actually been approved and built nearby (Village of Wilmette, 2026). County housing context (U.S. Census Bureau, 2025) and the federal price index (Federal Housing Finance Agency, 2026) together supply the background here: in a built out village in Cook County where finished values stay firm, land residuals remain meaningful. The difference between the two valuations is defined more formally in the report on the difference between a Wilmette home market value and its land value, which owners may find useful once their own two numbers exist.
Two background sources deserve a separate word, because owners often ask them to do more than they can. The QuickFacts household and housing context for Cook County describes the county the lot sits in, including the settled character that makes Wilmette land scarce, and it helps an owner understand the setting without pricing the parcel itself (U.S. Census Bureau, 2025). The federal house price index adds the direction of wider price movement over time, which tells an owner whether the finished market behind the residual has been strengthening or cooling, again without valuing any single lot (Federal Housing Finance Agency, 2026). Used at that background level, both sources support the test. Asked to replace the recorded sales and the parcel record, both would mislead it.
How do the two numbers get compared, and what tips the decision?
Place the net house figure and the working land figure side by side and ask three questions. First, which is larger today, on evidence rather than on hope? Second, how wide is the gap, because a narrow gap can be reversed by negotiation, competition among builders, or a household buyer who loves the house, while a wide gap is structural and will not close with staging. Third, how certain is each figure? A written builder bid is a fact in a way a projected list price is not, and an owner is entitled to convert the land side from estimate to fact by inviting bids before deciding, since builders acquired every older home in the sample and are demonstrably active in this market (Frontier Capitals, 2026).
Several signals tip the reading toward land before any bid arrives. The house needs the expensive systems all at once, roof, masonry, electrical and plumbing, the same items that drive the 15,000 to 35,000 dollar concession range. The layout belongs firmly to its decade, with small rooms that renovation cannot enlarge within the existing walls, remembering that the research illustration gives a 150,000 dollar renovation a return of 100,000 to 125,000 dollars with a live in buyer and 0 dollars with a buyer who clears the lot. The street shows new foundations rising within a block or two, visible in permit records (Village of Wilmette, 2026). The county assessment already loads value onto the land side of the parcel (Cook County, 2026). And the lot is wide for its street, the single physical advantage builders pay for out of proportion. Signals tipping the other way are equally recognizable: a house already renewed in its systems, a plan that suits modern family life in the New Trier district, and a lot so constrained that the finished house would be the smallest on the street.
Time also belongs in the comparison, because the two routes run on different clocks and Wilmette taxes make clocks expensive. The house route at 60 to 120 plus days can consume 30,000 to 60,000 dollars of holding cost across four to seven months, while the land route, sold directly, closes on a schedule the owner picks. An owner who finds the two values close should let the clock and the certainty decide, and both usually argue for land when the gap is thin. Owners can cross check their land figure against the report on how much a residential lot is worth in Wilmette before acting on the result.
What should an owner do once the test points to land?
Sell the property as land, to the buyers who price land, through the route built for that asset. The direct off market route carries five benefits that protect the land figure through closing. Privacy: no showings, no open houses and no public marketing period, so the owner is not parading a house that the market has already reclassified as a site. Flexible closing: 7 to 21 days when speed serves the owner, or months out with a leaseback style arrangement when a move needs time, against the 60 to 120 plus days of a listed older home. No commissions: the typical 5 to 6 percent, 37,500 to 45,000 dollars on a 750,000 dollar sale, is never charged (National Association of Realtors, 2025). No seller closing costs: the further 1 to 2 percent is removed as well, and the two avoided lines commonly exceed 50,000 dollars together on a 750,000 dollar transaction. No inspections or repairs: no 10,000 to 30,000 dollar repair credits and no 15,000 to 35,000 dollar inspection concessions, because the buyer is purchasing the lot and has no list of demands about a house that will not stand.
Role honesty and verification close the process. Frontier Capitals keeps its wholesale position explicit in that process, sourcing houses outside public marketing for builders and leaving any claim to building expertise with the builders themselves. That model is legitimate and common, and it still obliges the owner to verify the end buyer behind any offer: proof of funds in the buyer name dated within 30 days, recorded deeds in the buyer entity name checkable in county records (Cook County Recorder of Deeds, 2026), earnest money of typically 1 percent or more, and a hard look at any assignment clause paired with a nominal deposit, which marks a contract not meant to close. Owners can confirm that their address sits inside the geography covered by this research on the coverage page, and can ask for competing builder bids where the lot is strong, because a test that points to land deserves a market check before it becomes a contract.
Methodology and limitations
The test in this report is built from the research sample for 60091: 12 pre 1981 homes, all 12 acquired by builders, an average older home price of 27.5 percent of new build prices on comparable lots and a minimum lot of 6,600 square feet (Frontier Capitals, 2026). The 100.0 percent builder demand rate is quoted with its small sample caveat throughout and is evidence about the sampled oldest segment, not a census of Wilmette. The residual land value method is a simplified illustration from the research, using a 2,300,000 dollar finished sale, roughly 950,000 dollars of construction cost and a margin near 20 percent to leave 890,000 to 980,000 dollars before site preparation of 30,000 to 45,000 dollars, and it is labeled here, as in the research, as a model rather than a valuation of any individual property. The research contains no builder maximum price beyond that illustration. No inspection was performed for this research and no appraisal was performed, and owners who need a formal valuation for legal or tax purposes should commission one separately. Record based steps rely on county parcel and assessor material (Cook County, 2026; Cook County Assessor, 2026) and on sold listing records (Redfin, 2026).
Conclusion
A Wilmette homeowner determines whether a property is worth more as land by doing two honest valuations and comparing nets: the house, priced from older home evidence and reduced by commission, closing costs, concessions and tax heavy months, against the lot, priced by the residual under a finished home the street can support. In the research example the land side leaves 890,000 to 980,000 dollars before preparation while the average older home traded near 633,000 dollars, and builders took all 12 sampled homes, which is why the land reading wins so often in the oldest segment of 60091 (Frontier Capitals, 2026). The test belongs to the owner, not to any buyer, and running it from public records before listing, renovating or negotiating is the cheapest decision protection available in this market.
Owners who would like the two valuations run for a specific Wilmette property can telephone Frontier Capitals at 401-219-4207 or email [email protected].
When you subtract everything a household sale will charge you and everything a builder model leaves for your lot, which number is larger for your house, and how long have you known it?
Frequently Asked Questions
What is the quickest first check for land value?
Look at the county assessment split between land and building on the parcel (Cook County, 2026). If the land already carries most of the assessed value, and new foundations are rising nearby, the property is a strong candidate for the full residual test.
How does the residual method work in one sentence?
Take the finished price a new home on the lot can support, subtract construction cost of roughly 950,000 dollars on the research example and a margin near 20 percent, and the remainder, 890,000 to 980,000 dollars on a 2,300,000 dollar example before preparation of 30,000 to 45,000 dollars, is the working land value.
Can a house in good condition still be worth more as land?
Yes. Condition raises the house side of the test, but a wide lot on a street where finished homes close toward 2,900,000 dollars can produce a residual that passes even a well kept house (Redfin, 2026). The comparison is between numbers, not between conditions.
Why should automated estimates not settle the question?
Because valuation models blend new construction closings into older home figures, lending the house value that belongs to the land and the next build (Zillow, 2026). Recorded older home ratios and the residual method separate the two assets cleanly.
What verifies a builder bid received after the test?
Proof of funds in the buyer name dated within 30 days, recorded deeds for the entity in county records (Cook County Recorder of Deeds, 2026), earnest money of typically 1 percent or more, and no assignment clause paired with a nominal deposit.
Sources
- Frontier Capitals, 2026. 189 neighborhood builder demand sample: 12 homes sampled in 60091, 12 acquired by builders, average older home price 27.5 percent of new build. Market data.
- Cook County, 2026. Parcel and assessment records, Wilmette IL. Official record.
- National Association of Realtors, 2025. Typical seller commission structures, Chicago market. Industry report.
- Redfin, 2026. Recently sold homes and new construction, ZIP code 60091, Wilmette IL. Market data.
- U.S. Census Bureau, 2025. QuickFacts: Cook County, Illinois. Government data.
- Zillow, 2026. Home values and recently sold, 60091. Market data.
- Cook County Assessor, 2026. Parcel dimensions, zoning, and assessed land value records for 60091. Official record.
- Cook County Recorder of Deeds, 2026. Title, lien, and easement records. Official record.
- Village of Wilmette, 2026. Building permit records and foundation construction requirements. Official record.
- Federal Housing Finance Agency, 2026. House Price Index. Government data.