Market report · August 2026
West Islip housing market report
Suffolk County · Data as of October 2, 2026 · Based on OneKey® MLS · Updated monthly
12-month median price up 5.3%; inventory up 9.4%; seller's market
Market temperature · months of supply
2.4 months · seller's market
Median sale price
$951K
Last year $768K · +23.9%
Closed sales
21
Last year 10 · +110.0%
Homes for sale
35
Last year 32 · +9.4%
Avg. days on market
23 days
Last year 77 days
% of original list
102.3%
Last year 100.2%
New listings
20
Last year 19 · +5.3%
Month and last 12 months
| Metric | August 2025 | August 2026 | Change | Thru 08/2025 | Thru 08/2026 | Change |
|---|---|---|---|---|---|---|
| New listings | 19 | 20 | +5.3% | 233 | 221 | −5.2% |
| Closed sales | 10 | 21 | +110.0% | 185 | 174 | −5.9% |
| Avg. days on market | 77 | 23 | −70.1% | 43 | 39 | −9.3% |
| Median sale price | $767,500 | $951,000 | +23.9% | $760,000 | $800,000 | +5.3% |
| % of original list | 100.2% | 102.3% | +2.1% | 100.2% | 101.3% | +1.1% |
| Homes for sale / Avg. homes for sale | 32 | 35 | +9.4% | 36 | 28 | −22.2% |
From 2013-01 to 2026-08, the rolling 12-month median moved from $365K to $800K.
Highlights
- 10-year median +106.2%
- 63% sold above original list in 12 months
- $750K–$1M is the busiest band · 39% of sales
For sale today
West Islip Single-family 30 homes
Inventory down 100.0%; seller's market
Market temperature · months of supply
0 months · seller's market
Median sale price
—
Last year —
Closed sales
0
Last year 0
Homes for sale
0
Last year 1 · −100.0%
Avg. days on market
—
Last year —
% of original list
—
Last year —
New listings
0
Last year 1 · −100.0%
Month and last 12 months
| Metric | August 2025 | August 2026 | Change | Thru 08/2025 | Thru 08/2026 | Change |
|---|---|---|---|---|---|---|
| New listings | 1 | 0 | −100.0% | 3 | 0 | −100.0% |
| Closed sales | 0 | 0 | — | 0 | 3 | — |
| Avg. days on market | — | — | — | — | 74 | — |
| Median sale price | — | — | — | — | $515,000 | — |
| % of original list | — | — | — | — | 94.9% | — |
| Homes for sale / Avg. homes for sale | 1 | 0 | −100.0% | 1 | 0 | −100.0% |
From 2013-01 to 2026-08, the rolling 12-month median moved from $330K to $515K.
For sale today
West Islip Condo 0 homes
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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.