Permits through August 2026Yearly permits since 1995Mercer County index 1975–2025
Mercer County (100 = first year)United States, rebased to the same startNBER recession
House prices are indexed by county, not by city: this is Mercer 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.
In the 12 months to August 2026, building permits in West Windsor township, New Jersey, covered 243 housing units (−25.0% year on year); the place lies in Mercer County.
149 of those units were single-family houses (61%), 0 were in two- to four-unit buildings and 94 in buildings of five or more units.
Since 1995 the place has authorised 5,680 units, with the busiest year 2024 (770 units). Mercer County's FHFA house price index rose +87.3% over the ten years to 2025.
243units permitted, 12 months to August 2026−25.0% on the previous 12 months
149single-family units61% of the total
94units in 5+ unit buildings39% of the total
—units per 1,000 residentsMercer County 2.3 · New Jersey 3.3
Permits by month and structure type
Housing units authorised in West Windsor township by month, latest 24 monthssingle-family2+ unit buildings
Units, 12 months to August 2026
West Windsor township
Mercer County
New Jersey
United States
All housing units
243
929
31,546
1,418,086
Single-family (1 unit)
149 (61%)
497 (53%)
13,153 (42%)
888,241 (63%)
2 units
0
26
1,178
34,814
3–4 units
0
39
929
17,298
5 or more units
94 (39%)
367 (40%)
16,286 (52%)
477,733 (34%)
Units per 1,000 residents
—
2.3
3.3
4.1
Change on previous 12 months
−25.0%
−40.6%
−6.2%
−0.1%
Permits by year since 1995
Housing units authorised in West Windsor township by year, 1995–2025single-family2+ unit buildings
5,680 units since 1995; the busiest year was 2024. Annual figures include units imputed for months a place did not report.
Home prices in Mercer County
FHFA's index for Mercer County rose +87.3% over the ten years to 2025 (+6.5% a year) and +5.7% in the latest year, against +87.7% and +6.2% for New Jersey. 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 West Windsor township, NJ?
243 housing units were authorised by building permits in the 12 months to August 2026, against 324 in the previous 12 months.
What kind of housing is being permitted in West Windsor township?
149 single-family units, 0 in two-unit buildings, 0 in three- and four-unit buildings and 94 in buildings of five or more units.
How does West Windsor township compare with its county and state?
No population estimate is attached to this permit-issuing area, so a per-resident rate is not shown; Mercer County runs at 2.3 units per 1,000 residents and New Jersey at 3.3.
How have home prices moved in Mercer County?
FHFA's index for Mercer County rose +87.3% over the ten years to 2025 and +5.7% 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 564000); 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.