Why Two 3,000 Square Foot Homes Can Sell for Very Different Prices in Fairfield County
By Matt Caiola
If you have compared two listings that both say 3,000 square feet and wondered why one is priced so much higher than the other, one common answer is how much of that square footage is above ground, and the headline square footage number shown on Zillow and other real estate listing portals does not always make that clear.
Being an active agent in these towns, I have a good sense of how buyers react to a finished lower level, but I wanted to see what the data showed, so I took every single-family home that closed across Greenwich, Darien, New Canaan, Westport, Wilton, Ridgefield, Fairfield, Stamford and Norwalk between September 2025 and August 2026, a total of 3,102 sales, and compared homes of about the same total size.
As it turns out, among homes with between 2,750 and 3,250 total square feet, homes with all of that space above grade sold for a median of $1,531,250, compared to $1,180,000 for homes with part of that total below grade, a difference of $351,250.
Above Grade vs. Total Square Footage
Above grade means finished living space at or above ground level, such as the main floor and the bedrooms upstairs. Below grade means a finished lower level, such as a finished basement. Total square footage adds the two together.
The difference matters because in most cases buyers and appraisers weigh the two kinds of space differently. Appraisers typically report finished below-grade space separately from gross living area, which counts above-grade space, and buyers tend to value a lower level differently from the main floors.
Here in Fairfield County this comes up often. 1,114 of the 3,102 sales (35.9%) included finished space below grade, with a median of 797 square feet, or 22.2% of the home's total square footage. Price per square foot is the closing price divided by the home's square footage, so it changes depending on which square footage you use. Across all 3,102 sales, homes sold for $481 per foot on total square footage compared to $531 per foot on above-grade square footage only. For more on how that measure varies, see my price per square foot by town.
Two 3,000 Square Foot Homes, Side by Side
To compare homes of about the same size, I looked at the 348 sales with between 2,750 and 3,250 total square feet: 220 of those 348 sales contained all of that space above grade while 128 had part of it below grade. On total square footage, the first group sold for $500 per foot and the second for $401 per foot.
The second group had a median of 2,366 square feet above grade, and on that measure they sold for $516 per foot, close to the $500 the all-above-grade homes brought. In other words, buyers paid about the same per foot of above-grade space in both groups, which suggests the finished lower level added much less to the price than the same footage upstairs would have.
Lot size, age, condition and location also differ between these houses, so treat the gap as a pattern in what sold here in Fairfield County rather than a value for any one lower level.
The same pattern showed up town by town. In seven of the nine towns, homes with a finished lower level sold for a lower median than homes of the same total size that were entirely above grade. Wilton came out about even, and Greenwich had too few sales with a finished lower level in that size range to compare.
Town by Town
A finished lower level is much more common in some towns than in others. 53% of sales in Ridgefield and New Canaan included one, compared to 23% in Stamford. In every town, the price per foot on above-grade square footage was higher than on total square footage. The gap was widest in Westport and narrowest in Stamford.
39% of Darien's 212 sales included finished space below grade. Homes sold for a median of $771 per foot on total square footage compared to $841 per foot on above-grade square footage. See Darien single-family homes.
36% of Fairfield's 589 sales included finished space below grade. Homes sold for a median of $466 per foot on total square footage compared to $525 per foot on above-grade square footage. See Fairfield single-family homes.
24% of Greenwich's 217 sales included finished space below grade. Homes sold for a median of $772 per foot on total square footage compared to $812 per foot on above-grade square footage. Greenwich figures exclude Greenwich MLS listings. See Greenwich single-family homes.
53% of New Canaan's 217 sales included finished space below grade. Homes sold for a median of $612 per foot on total square footage compared to $697 per foot on above-grade square footage. See New Canaan single-family homes.
29% of Norwalk's 510 sales included finished space below grade. Homes sold for a median of $411 per foot on total square footage compared to $455 per foot on above-grade square footage. See Norwalk single-family homes.
53% of Ridgefield's 241 sales included finished space below grade. Homes sold for a median of $401 per foot on total square footage compared to $459 per foot on above-grade square footage. See Ridgefield single-family homes.
23% of Stamford's 575 sales included finished space below grade. Homes sold for a median of $404 per foot on total square footage compared to $427 per foot on above-grade square footage. See Stamford single-family homes.
48% of Westport's 321 sales included finished space below grade. Homes sold for a median of $626 per foot on total square footage compared to $735 per foot on above-grade square footage. See Westport single-family homes.
40% of Wilton's 220 sales included finished space below grade. Homes sold for a median of $425 per foot on total square footage compared to $478 per foot on above-grade square footage. See Wilton single-family homes.
What This Means for a Buyer
When two listings share a square footage, check how much of it is above grade before you compare prices. The listing details and floor plan usually show it, and if a lower level is included, it is worth asking how it is finished, including the ceiling height, the windows and whether the space is permitted.
A finished lower level is useful living space for a playroom, office or guest room, and if that is what you want, it may be a way to get more total room for your budget. If you are starting a search this Fall, you can look at every single-family home for sale across the nine towns on my site, and if you create a free account you will get email alerts on new listings.
What This Means for a Seller
If your home has a finished lower level, you have space that buyers enjoy, and it is worth showing well. When it comes to your listing price, though, most buyers and appraisers weigh the lower level differently from your main floors, so the comparable sales that matter most are homes with a similar amount of above-grade square footage. Pricing against homes with the same total but all of it above grade can put your asking price above what buyers are paying.
If you're thinking about selling, the free home valuation on my site is a good place to start, and I'd be happy to go over which recent sales compare best to your home!
Figures are from SmartMLS single-family closings, September 2025 through August 2026, across Greenwich, Darien, New Canaan, Westport, Wilton, Ridgefield, Fairfield, Stamford and Norwalk. Total square footage includes finished space below grade. Greenwich figures exclude Greenwich MLS listings.
