Market report · August 2026
Old Westbury housing market report
Nassau County · Data as of October 2, 2026 · Based on OneKey® MLS · Updated monthly
12-month median price up 3.9%; inventory down 26.3%; balanced market
Market temperature · months of supply
5.1 months · balanced market
Median sale price
$6.15M
Last year $5.5M · +11.8%
Closed sales
2
Last year 1 · +100.0%
Homes for sale
14
Last year 19 · −26.3%
Avg. days on market
45 days
Last year 14 days
% of original list
92.9%
Last year 94.9%
New listings
1
Last year 5 · −80.0%
Month and last 12 months
| Metric | August 2025 | August 2026 | Change | Thru 08/2025 | Thru 08/2026 | Change |
|---|---|---|---|---|---|---|
| New listings | 5 | 1 | −80.0% | 47 | 46 | −2.1% |
| Closed sales | 1 | 2 | +100.0% | 35 | 33 | −5.7% |
| Avg. days on market | 14 | 45 | +221.4% | 136 | 106 | −22.1% |
| Median sale price | $5,500,000 | $6,150,000 | +11.8% | $3,300,000 | $3,430,000 | +3.9% |
| % of original list | 94.9% | 92.9% | −2.1% | 89.7% | 89.1% | −0.7% |
| Homes for sale / Avg. homes for sale | 19 | 14 | −26.3% | 21 | 18 | −14.3% |
From 2013-01 to 2026-08, the rolling 12-month median moved from $1.76M to $3.43M.
Highlights
- 10-year median +63.5%
- 9% sold above original list in 12 months
- $3M–$5M is the busiest band · 49% of sales
For sale today
Old Westbury Single-family 15 homes
Curious what your home is worth?
Source: OneKey® MLS, calculated by Homix following OneKey's market report method; figures may differ slightly from OneKey's own reports. Prices do not account for concessions or down-payment assistance; small samples can make percent changes look extreme.