Why Price Per Square Foot Can Mislead DuPage County Homebuyers and Sellers

Price per square foot is easy to calculate, which is exactly why it is often given more authority than it deserves. It can be a useful reference when two homes are genuinely similar. It is not a complete valuation method, and it can produce the wrong conclusion when buyers or sellers compare homes that differ in location, condition, layout, lot, construction quality or the way finished space is counted.

Across Elmhurst, Glen Ellyn, Wheaton, Lombard, Naperville and the surrounding Western Suburbs, two homes in the same town can appeal to different buyers and trade at very different prices per square foot. The more varied the housing stock, the less reliable a town-wide average becomes.

The formula is simple. The comparison is not.

Price per square foot equals the sale price divided by the reported finished area. The calculation itself is not the problem. The problem is assuming that every square foot, every location and every home feature contributes equal value.

Consider two nearby homes. Home A sells for $750,000 and is reported at 2,500 square feet, or $300 per square foot. Home B sells for $735,000 and is reported at 2,250 square feet, or about $327 per square foot. It may be tempting to call Home A the better value. But Home B might have a fully renovated interior, a more functional layout, a quieter interior location and walkability to the Metra and downtown. Home A might need major updates and include space that buyers value less. The lower price per square foot does not automatically mean the better purchase.

1. Above-grade and below-grade space are not interchangeable

A finished basement can be valuable, but it is not normally analyzed as if it were identical to above-grade living space. Ceiling height, natural light, access, finish quality and utility all affect how buyers react to it. Reported square footage can also vary among MLS records, assessor data and appraisal measurements.

Fannie Mae’s property-measurement guidance notes that finished areas may be reported separately because of factors such as below-grade walls, low ceilings, inferior quality or separation from the main living area. It also emphasizes that valuation adjustments should reflect market reaction rather than a mechanical formula.

2. Location can change within a few blocks

The same city name does not create the same market position. Proximity to a downtown, train station, busy road, commercial use, park, school boundary or flood-prone area can affect demand. Even within one subdivision, an interior lot may compete differently from a home backing to traffic or nonresidential property.

This is why the strongest comparable sale is not always the closest home or the newest sale. It is the property that competes for the same buyer. Fannie Mae’s appraisal policy similarly directs appraisers to consider market area, site, room count, finished area, style, condition and location when selecting and adjusting comparable sales.

3. Condition and renovation quality matter

A renovated home and an outdated home of the same size are not direct substitutes. Buyers react differently to thoughtful, permitted improvements than to cosmetic work that leaves major systems, windows, roofing or functional problems unresolved. A new kitchen may add appeal, but the whole property still matters.

4. Functional square footage can be more valuable than total square footage

Buyers experience a home through its layout, not a spreadsheet. A smaller home with good flow, adequate storage, a first-floor office and appropriately sized bedrooms may feel more useful than a larger home with awkward additions, pass-through rooms or wasted hall space.

5. Lot, garage and outdoor utility are left out of the formula

Price per square foot focuses on the house and largely ignores the site. Lot width, privacy, drainage, mature trees, outdoor entertaining space, garage configuration and usable yard can materially affect demand. These features are especially important when comparing older Western Suburbs neighborhoods where lots and detached improvements vary widely.

6. Property type and construction era must match

A ranch, two-story home, split-level, townhouse and condominium should not be combined into one simple average. Construction quality, association obligations, land ownership, maintenance expectations and buyer pools differ. Even two detached homes may not be comparable if one is newer construction and the other is a vintage home with a major addition.

7. Boundaries and ongoing ownership costs affect buyer decisions

Mailing address alone does not establish the same school, municipality, tax district or service profile. Property taxes, association dues, insurance considerations and expected maintenance can change the monthly cost of ownership. Buyers often price those differences into what they are willing to pay, even though none appears in the price-per-square-foot calculation.

8. Sale terms can distort a headline number

A recorded sale price may include seller-paid credits or reflect financing, possession, repair and timing terms that affected the agreement. Market conditions may also change between the comparable sale date and today. A useful analysis looks behind the number instead of treating every closing as identical.

When price per square foot is useful

The metric becomes more useful when the comparison group is narrow and consistent. It can help identify an outlier or prompt better questions when the homes share the same property type, similar location, comparable above-grade finished area, similar condition, similar construction quality and a reasonably close sale date.

• Use it as a screening tool, not a final answer.

• Confirm what square-footage source is being used.

• Separate above-grade and below-grade finished areas.

• Compare similar property types, locations and condition levels.

• Review the actual comparable sales and their terms.

How I evaluate value for buyers

For a buyer, I begin by identifying the homes that truly compete with the property under consideration. I compare recent sales, active competition, condition, location, layout, lot, taxes and likely buyer objections. Price per square foot is one checkpoint, but it does not replace a property-specific analysis.

That process helps answer the more important question: Is this home reasonably positioned for what it offers, and do its advantages justify the price relative to the alternatives available to this buyer?

How I evaluate value for sellers

For a seller, I avoid building a pricing recommendation around a broad city average. The goal is to select the smallest credible set of comparable properties, then explain the differences a likely buyer will notice. A defensible list price should reflect the home’s real competitive position, not simply multiply its reported size by an average pulled from unrelated sales.

The bottom line

Price per square foot is useful context, but it is not the value of a home. Buyers can overpay for a weak fit or overlook a strong one when they rely on it too heavily. Sellers can also misprice a property when they apply a neighborhood average without accounting for the features and tradeoffs that actually drive demand.

If you are comparing a specific property or preparing to sell in DuPage County, I can provide a property-level analysis using relevant MRED sales and current competition. Schedule a buyer or seller consultation with John Salidas at https://www.thenewageofrealestate.com/real-estate-services or call (630) 825-9722.

Sources and methodology

This article reflects John Salidas’s market-analysis process and general real estate guidance. For appraisal measurement and comparable-sale principles, see Fannie Mae’s Standardizing Property Measuring Guidelines: https://singlefamily.fanniemae.com/media/30266/display and UAD 3.6 Policy: https://singlefamily.fanniemae.com/media/42571/display. An appraisal, broker price opinion and comparative market analysis serve different purposes; this article is not an appraisal.