A residential lot in Wilmette is worth what remains after the cost and margin of the next home are removed from the price that home can achieve, and the worked illustration in the research puts that remainder in a concrete range. Starting with a new build sale of 2,300,000 dollars, subtracting roughly 950,000 dollars in hard and soft construction costs, and allowing a builder margin near 20 percent leaves a residual land value in the neighbourhood of 890,000 to 980,000 dollars, before site preparation costs of 30,000 to 45,000 dollars (Frontier Capitals, 2026). The illustration is labelled a simplified model, not a promise or a village wide price list, because the finished value, the build cost, and the lot itself change from street to street. The surrounding evidence explains why land carries so much weight here: Wilmette has effectively no vacant residential land, sampled older homes averaged 27.5 percent of new construction prices on comparable lots, and new construction in 60091 has sold from 1,800,000 dollars to 2,900,000 dollars depending on street, lot width, and closeness to the lake and the village center (Frontier Capitals, 2026; Redfin, 2026).
Key Findings
- The worked residual illustration produces a land value of 890,000 to 980,000 dollars from a 2,300,000 dollar new build, before site preparation of 30,000 to 45,000 dollars.
- Construction cost in that illustration is roughly 950,000 dollars in hard and soft costs, and the builder margin sits near 20 percent.
- Sampled older homes averaged 27.5 percent of new build prices on comparable lots, with an older home near 633,000 dollars against the same 2,300,000 dollar benchmark (Frontier Capitals, 2026).
- Builders acquired 12 of 12 sampled pre-1981 homes in 60091, a 100.0 percent rate on a sample of 12 that must always be reported with its sample size (Frontier Capitals, 2026).
- New construction on comparable lots has sold from 1,800,000 dollars to 2,900,000 dollars, the range that moves the residual more than any other single input (Redfin, 2026).
- No builder maximum price beyond the worked residual illustration exists in the source material, so no higher universal figure is claimed in this report.
How is the residual figure built, line by line?
Line one is the expected finished sale. It should come from closed new construction on lots genuinely comparable to the subject lot, in the same part of Wilmette, with similar width and a similar relationship to the lake, the village center, and the New Trier district. Asking prices for unfinished or unsold homes are weaker evidence because they record hope rather than a completed bargain. Closed records for homes and new construction in this ZIP code provide the starting point for that selection (Redfin, 2026).
Line two is construction cost. The illustration uses roughly 950,000 dollars for hard and soft costs on the 2,300,000 dollar example, covering the build itself and the professional, permit, and carrying expenses around it. A larger finished home, a more demanding design, or a more difficult site raises that line and lowers the land remainder by the same movement. A builder who understates this line can offer more for land on paper and lose the project in practice, which is why sellers should be wary of a residual that depends on unusually cheap construction.
Line three is margin, near 20 percent in the illustration. Margin is not a gratuity. It pays for the risk that prices move during a long build, that costs rise after the land is bought, and that capital is tied to one Wilmette street for an extended period. Remove the margin from the calculation and the resulting land figure describes a project no prudent builder should undertake, even if the arithmetic looks generous to the seller.
Line four is site preparation, given in the research as 30,000 to 45,000 dollars after the residual range. Clearing, grading, and preparing an occupied residential lot for a new foundation are real costs that sit between buying a house and owning a buildable site. Village requirements, including foundation construction requirements recorded in building material, form part of the environment in which those costs arise (Village of Wilmette, 2026). The final land value for a specific lot is therefore the residual range reduced by the preparation figure that the specific site requires, and adjusted again where dimensions or zoning change what can be built.
What public records say about a Wilmette lot before any builder speaks?
The official record starts with the parcel itself. County parcel and assessment records for Wilmette establish the public identity of the property, its assessment history, and the record a buyer or lender will consult (Cook County, 2026). A seller who reads those records first enters any land conversation knowing the same basic facts the other side will use.
Dimensions and zoning come from the more detailed assessor material for this ZIP code, which records parcel dimensions, zoning, and assessed land values (Cook County Assessor, 2026). Width and depth decide the footprint and orientation of the next home. Zoning decides whether the assumed home is permitted at all. Assessed land value offers an official reference point, although it is an assessment figure rather than a market bid and should not be confused with one.
A separate assessor office record set covers lot dimensions, assessed land values, and recent sale prices together, which helps a seller place the parcel beside actual transactions rather than beside opinion (Cook County Assessor's Office, 2026). Recent sale prices in that material can reveal whether lots and older homes on the street have been moving at land level or at household level. That distinction is the beginning of a credible lot valuation, because a street where older homes sell to families at strong prices sets a different floor from a street where purchases are consistently made for replacement.
Title history completes the public picture. Recorded title, lien, and easement material can disclose constraints that affect what a builder can do with the site, from easements that limit placement to liens that must be cleared at closing (Cook County Recorder of Deeds, 2026). A lot with a clean title and no placement constraint is worth more to a project than the same measured lot carrying a restriction, even where the two parcels look identical from the sidewalk.
Why do two Wilmette lots of similar size carry different values?
Finished value is the largest reason. A lot on a lakefront street, or on one of the oldest streets where replacement homes command the top of the local range, supports a higher first line in the residual than a lot where finished homes close near the bottom of the 1,800,000 dollar to 2,900,000 dollar span (Redfin, 2026). Because construction cost does not fall in proportion to finished value, a stronger street can leave a disproportionately larger remainder for land.
The second reason is what the lot allows. A wide parcel can hold a house with the room arrangement North Shore households expect, plus garage and outdoor space that a narrow parcel forces into compromise. The sample of older homes used a minimum lot of 6,600 square feet, which gives sellers a reference point for the sampled pool, not a threshold below which a lot has no building value (Frontier Capitals, 2026). Shape, slope, trees, and access all adjust the allowance a builder makes, and they adjust it through cost and through expected finished appeal rather than through a published per foot formula. No such formula exists in the source material, and none is offered here.
The third reason is the standing house and how the market reads it. Where the existing home has strong household value, the lot is rarely sold separately from that value, and the owner should compare the combined household price against the land residual before concluding that the land alone is worth a particular figure. Where the existing home contributes little household value, the transaction becomes a land transaction in substance, whatever the deed calls it. The analysis in the report on the difference between market value and land value in Wilmette separates those two readings for owners facing exactly this choice.
Community context supports the general level without fixing any parcel price. Housing data from the American Community Survey describes the established Cook County stock and the households competing for space within it (U.S. Census Bureau, 2025). Wilmette demand rests on location, schools, Metra access to the Loop, and Lake Michigan to the east, in a village that is the southern anchor of the North Shore. Those forces explain why builders keep returning to existing lots. They do not tell a seller on a particular street whether the residual is closer to the bottom or the top of the illustrated range, which only street level finished sales can do.
How should an owner use the illustration without overstating it?
Use the illustration as a set of questions with numbers attached. What have new homes on comparable lots on this street actually closed for? What would a builder familiar with Wilmette charge to construct the home those closings represent? What margin would that builder require in the current season? What will preparation of this specific site cost? Each answer should come with a document, a closing record, or a bid, because the residual is only as honest as its weakest input.
Automated valuation pages are not a substitute for that work. Home value estimates for 60091 can help an owner notice a broad movement, but they are built to value a house as a residence, not to run a builder residual on the lot beneath it (Zillow, 2026). An estimate can therefore sit below a genuine land bid on a strong lot, or above any supportable bid on a weak one, without the model being useful evidence in either direction. Treat the estimate as background noise and ask for the calculation. The same office records also let an owner check a recent sale price on the street against the assessed land value for that parcel, rather than treating either figure as a bid (Cook County Assessor's Office, 2026).
Owners should also resist converting the illustration into a per square foot price and applying it across the village. The research gives a residual range for a specified finished value, and it gives a sample ratio and a sample minimum lot size. It does not give a land rate that can be multiplied by the dimensions of an unrelated parcel. A seller who encounters such a rate should ask which closed sales produced it, and should expect the answer to name streets and dates rather than a slogan. The broader valuation approach is laid out in the guide to determining a Wilmette property value.
What does selling the lot through the standing house actually cost?
Most Wilmette lots reach a builder with a house standing on them, so the sale ledger matters to the land question. On a sale of 750,000 dollars, a 5 to 6 percent commission removes 37,500 dollars to 45,000 dollars (National Association of Realtors, 2025). Seller side closing costs commonly add 1 to 2 percent, and the commission and closing lines together commonly exceed 50,000 dollars. A listed older home commonly spends 60 to 120 or more days on the route to closing, and Wilmette property taxes of 18,000 to 35,000 dollars a year mean each month carries 1,500 dollars to nearly 3,000 dollars in taxes alone, before other holding costs (Frontier Capitals, 2026). A seller comparing a land bid with a household bid should compare both after those deductions, not the household gross against the land net.
Inspection bargaining belongs in the household column as well. Concessions on older North Shore homes routinely run from 15,000 to 35,000 dollars for masonry, electrical, and plumbing findings, which can pull a household price toward the land figure late in the transaction (Frontier Capitals, 2026). A land buyer does not need the standing systems to perform, so that concession pattern does not apply in the same way.
The direct off market route makes the land comparison cleaner through five benefits. Privacy is assured, with no showings, no open houses, and no public marketing period, which matters when an owner does not want the village discussing a family property before terms are settled. Closing is flexible, available in 7 to 21 days when speed is needed or months out with a leaseback style arrangement, rather than the 60 to 120 plus days of the listed route. The commission line disappears entirely, saving the typical 5 to 6 percent, equal to 37,500 dollars to 45,000 dollars on a 750,000 dollar sale (National Association of Realtors, 2025). No seller closing costs are charged, removing the typical 1 to 2 percent, with the two avoided lines commonly exceeding 50,000 dollars together at that price. No inspections or repairs are required, so the owner avoids 10,000 to 30,000 dollar repair credits and the 15,000 to 35,000 dollar concession negotiation that follows many inspections. For a lot whose value is in the ground, those terms let the ground be priced without charging the owner for presenting the house. Owners can confirm the relevant geography through the coverage page and request the residual discussion through the contact page.
How can a land seller verify that a bid matches the method?
Role clarity comes first, because a land bid can be quoted by parties with very different capacities to close. Frontier Capitals works as a wholesaler, sourcing off market deals to builders, and it does not hold itself out as a builder. That statement tells a seller exactly what the firm does: it agrees a purchase with an owner and places the property with a builder. The seller should then verify that the arrangement is funded and that the contract terms match the description.
Ask to see proof of funds, in the buyer name and dated within the past 30 days. Verify recorded deeds in the buyer entity name in county records, where closed purchases can be inspected directly (Cook County Recorder of Deeds, 2026). Require earnest money of typically 1 percent or more, so the buyer carries a real cost for failing to complete. Treat an assignment clause paired with a nominal deposit as a warning, because that pairing marks a contract not meant to close with the person who signed it. Finally, ask to see the residual inputs behind the bid, including the finished value the buyer used and the preparation allowance for the site. A bid consistent with the method in this report can survive those questions. A bid built on pressure usually cannot.
Methodology and limitations
The Wilmette sample used in this report covers 12 pre-1981 homes in 60091, all 12 acquired by builders, for a builder demand rate of 100.0 percent (Frontier Capitals, 2026). The caveat attached to that rate is that 12 homes form a small sample, so the rate is evidence of builder presence in the sampled older stock and not a census of the ZIP code or a promise for a specific lot. The land figure at the centre of this report is the worked residual illustration, which is a simplified model: a 2,300,000 dollar new build sale, roughly 950,000 dollars in hard and soft construction costs, a builder margin near 20 percent, a residual of 890,000 to 980,000 dollars, and site preparation of 30,000 to 45,000 dollars still to be allowed. No builder maximum price beyond that illustration exists in the source material. No inspection and no appraisal formed part of this report. An individual lot can fall outside the illustrated range in either direction where its finished value, dimensions, zoning, title, or preparation cost differ from the illustration assumptions.
Conclusion
A Wilmette residential lot in the worked illustration is worth 890,000 to 980,000 dollars before site preparation, derived from a 2,300,000 dollar finished home after roughly 950,000 dollars of construction cost and a margin near 20 percent. The durable lesson is the method rather than the range: land here is priced backward from a finished Wilmette home that the market has already proven it will buy, on a street where no vacant alternative exists. An owner who obtains closed finished values, a real construction figure, and a documented bid can learn what a specific lot is worth with far more confidence than an owner who starts with the age or condition of the house standing on it.
For a residual discussion about a particular Wilmette property, call Frontier Capitals at 401-219-4207 or email [email protected].
If your lot were priced only by the home that could stand on it next, rather than by the home standing on it now, would you expect the number to rise or fall?
Frequently Asked Questions
What is the headline land figure in the research?
The simplified illustration gives 890,000 to 980,000 dollars before site preparation of 30,000 to 45,000 dollars, from a 2,300,000 dollar new build after roughly 950,000 dollars of construction cost and a margin near 20 percent.
Is that figure the value of every Wilmette lot?
No. It is a worked illustration tied to its finished value and cost assumptions, and a specific lot moves with its street, dimensions, zoning, title, and preparation cost.
Why is land so valuable in a village with high house prices?
Because Wilmette has effectively no vacant residential land, so a new home requires an existing property, and finished homes on comparable lots have sold from 1,800,000 dollars to 2,900,000 dollars (Redfin, 2026).
How does the standing house affect the lot figure?
A house with strong household value adds a competing use and should be compared on net proceeds, while a house with little household value leaves the transaction to be priced mainly as land.
What documents should support a land bid?
Proof of funds dated within 30 days, recorded deeds in the buyer entity name, earnest money of typically 1 percent or more, and a visible residual calculation behind the price.
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.
- Redfin, 2026. Recently sold homes and new construction, ZIP code 60091, Wilmette IL. Market data.
- National Association of Realtors, 2025. Typical seller commission structures, Chicago market. Industry report.
- Cook County, 2026. Parcel and assessment records, Wilmette IL. Official record.
- Cook County Assessor, 2026. Parcel dimensions, zoning, and assessed land value records for 60091. Official record.
- Cook County Assessor's Office, 2026. Parcel records: lot dimensions, assessed land values, and recent sale prices. Official record.
- Zillow, 2026. Home values and recently sold, 60091. Market data.
- U.S. Census Bureau, 2025. American Community Survey housing data. Government data.
- Village of Wilmette, 2026. Building permit records and foundation construction requirements. Official record.
- Cook County Recorder of Deeds, 2026. Title, lien, and easement records. Official record.