Permits through August 2026Yearly permits since 1995Suffolk County index 1975–2025
Suffolk County (100 = first year)United States, rebased to the same startNBER recession
House prices are indexed by county, not by city: this is Suffolk County's FHFA index, with the national index rebased to the same start.
Census Bureau notes: building permit figures cover new privately owned housing units authorised by permit-issuing places; permits do not mean the units were started or completed, and places that report less often than monthly are imputed in monthly totals. FHFA notes: The FHFA HPI is a broad measure of the movement of single-family house prices. The FHFA HPI is a weighted, repeat-sales index, meaning that it measures average price changes in repeat sales or refinancings on the same properties.
Islip town, New York (Suffolk County), authorised 58 housing units through building permits in the 12 months to August 2026, +56.8% on the previous 12 months.
58 of those units were single-family houses (100%), 0 were in two- to four-unit buildings and 0 in buildings of five or more units.
Since 1995 the place has authorised 8,322 units, with the busiest year 1996 (915 units). Suffolk County's FHFA house price index rose +92.3% over the ten years to 2025.
58units permitted, 12 months to August 2026+56.8% on the previous 12 months
58single-family units100% of the total
0units in 5+ unit buildings0% of the total
—units per 1,000 residentsSuffolk County 0.7 · New York 2.4
Permits by month and structure type
Housing units authorised in Islip town by month, latest 24 monthssingle-family2+ unit buildings
Units, 12 months to August 2026
Islip town
Suffolk County
New York
United States
All housing units
58
1,119
48,587
1,418,086
Single-family (1 unit)
58 (100%)
897 (80%)
10,167 (21%)
888,241 (63%)
2 units
0
2
1,322
34,814
3–4 units
0
9
783
17,298
5 or more units
0 (0%)
211 (19%)
36,315 (75%)
477,733 (34%)
Units per 1,000 residents
—
0.7
2.4
4.1
Change on previous 12 months
+56.8%
−4.4%
+38.8%
−0.1%
Permits by year since 1995
Housing units authorised in Islip town by year, 1995–2025single-family2+ unit buildings
8,322 units since 1995; the busiest year was 1996. Annual figures include units imputed for months a place did not report.
Home prices in Suffolk County
FHFA's index for Suffolk County rose +92.3% over the ten years to 2025 (+6.8% a year) and +5.4% in the latest year, against +85.6% and +6.0% for New York. Full county page: decade table, peak-to-low declines, every ZIP code and every permit-issuing place in the county.
Questions and answers
How many homes are being built in Islip town, NY?
58 housing units were authorised by building permits in the 12 months to August 2026, against 37 in the previous 12 months.
What kind of housing is being permitted in Islip town?
58 single-family units, 0 in two-unit buildings, 0 in three- and four-unit buildings and 0 in buildings of five or more units.
How does Islip town compare with its county and state?
No population estimate is attached to this permit-issuing area, so a per-resident rate is not shown; Suffolk County runs at 0.7 units per 1,000 residents and New York at 2.4.
How have home prices moved in Suffolk County?
FHFA's index for Suffolk County rose +92.3% over the ten years to 2025 and +5.4% in the latest year; the county page has the full series.
What does a permit count?
A housing unit authorised by a building permit for new privately owned residential construction, as reported to the Census Bureau Building Permits Survey by the permit-issuing office. Permits are not completions; some permitted units are never built, and places that report only annually are imputed in monthly figures.
Provenance
Permits: US Census Bureau, Building Permits Survey, place-level monthly and annual files through August 2026 (permit office 359000); county and state comparisons from the county and state files. Population: Census Bureau vintage 2025 estimates for incorporated places, matched on FIPS place code where the permit office is one. House price index: Federal Housing Finance Agency. Public domain. Corrections · Building Permits Survey.