Greenwich single-family home sales surged 23% in September after inventory jumped from 75 to 107 listings in the week after Labor Day, according to real estate columnist Mark Pruner.
Pruner reported in the Greenwich Sentinel on Sunday, Oct. 4, that 37 homes sold in September, up from 30 in September 2025. The jump followed a burst of new listings that pushed single-family inventory from 75 at the end of August to 107 by the end of Labor Day week.
"Both of those things can be explained with one word 'inventory,'" Pruner wrote.
September ended with 119 active listings, just above the 116 recorded a year earlier. Sellers brought 78 new listings to market during the month, compared with 69 in September 2025. Of those 78, Pruner said 14 went under contract before September ended, a pace he calls "blue moon" listings.
The median sale price hit $3.6 million in September, up from $3.15 million at the end of 2025. About 70% of the month's 37 sales closed at or above full list price. Median days on market stood at 17, with 2.8 months of supply.
The broader third quarter of 2026 moved in the opposite direction. Sales fell 7.5%, from 161 in the third quarter of 2025 to 149 this year. Through the first three quarters, Greenwich recorded 380 sales, down from 393 in the same period last year.
Pruner attributed the quarterly decline to the same factor that powered September's rebound: inventory had run roughly 20% below 2025 levels for most of the year until the Labor Day surge.
Luxury segment surges
The $6.5 million to $10 million price band posted the sharpest gains. Sales in that range jumped 87%, from 23 through the third quarter of 2025 to 43 through the same period this year. Another 10 contracts in that band were awaiting closing, Pruner reported.
Mid-market sales lagged behind. Transactions between $1 million and $4 million fell by 29, a 14% drop compared with 2025. Pruner noted that inventory in the $1.5 million to $4 million range was up at September's end, a sign he said could reverse that slide.
"When you look at the weekly contract numbers … our contracts turned up two weeks after our inventory took off after Labor Day," Pruner wrote.
Separate data from William Pitt Sotheby's International Realty showed 40 units sold and a $2.9 million median sale price for September. The firm's tracker counted 77 new listings and 286 total inventory units. The two datasets use different methodologies and scopes, making direct comparisons difficult.
Pruner reported 60 contracts signed in September, down slightly from 63 a year earlier. Whether the inventory rebound holds through the fall will shape the fourth quarter's numbers.
