How old are the homes in Green Brook Township, NJ?

Name: Age of homes in Green Brook Township, NJ, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

50.0% (±10.6 points) of the homes in Green Brook Township, NJ were built before 1980 (2020–2024 American Community Survey).

2.9% were built before 1940.

5.3% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 50.0% (±10.6 points)
Built before 1940: 2.9%
Built 2010 or later: 5.3%

When the homes in Green Brook Township were built

Housing units by year structure built, 2020–2024
Year built	Green Brook Township	Somerset County	New Jersey	United States
2020 or later	0.7% (±1.1 points)	1.3%	1.1%	2.0%
2010 to 2019	4.6% (±4.1 points)	6.1%	6.2%	9.4%
2000 to 2009	16.9% (±6.2 points)	9.7%	9.2%	13.6%
1990 to 1999	22.7% (±10.2 points)	16.8%	8.9%	12.4%
1980 to 1989	5.1% (±3.5 points)	19.7%	11.8%	12.9%
1970 to 1979	10.9% (±5.0 points)	9.3%	12.3%	14.2%
1960 to 1969	10.1% (±5.3 points)	12.9%	12.8%	9.9%
1950 to 1959	20.6% (±6.1 points)	10.3%	13.8%	9.5%
1940 to 1949	5.5% (±4.1 points)	4.5%	6.5%	4.4%
1939 or earlier	2.9% (±2.5 points)	9.3%	17.4%	11.7%

In Green Brook Township, the share of homes built before 1980 is not measurably different from Somerset County (46.3%).

It is also lower than in New Jersey (62.8%).

It is not measurably different from the national figure (49.7%).

In Somerset County, Green Brook Township ranks 12 of 21 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 455 of 564.

Rankings use the estimates alone; where margins of error overlap, neighboring ranks may not truly differ.

Why the age of a home matters: lead-based paint

Federal law treats housing built before 1978 as likely to contain lead-based paint.

Before a lease or sale of most pre-1978 housing, the landlord or seller must disclose any known lead-based paint and hazards and give the tenant or buyer the EPA pamphlet (42 U.S.C. § 4852d; 40 CFR part 745, subpart F; 24 CFR part 35, subpart A).

A contractor paid to renovate, repair or paint a pre-1978 home must be a certified firm, use a certified renovator and follow lead-safe work practices under the Renovation, Repair and Painting Rule (40 CFR part 745, subpart E) whenever the job disturbs more than 6 square feet of painted surface in a room or more than 20 square feet outside; window replacement and demolition always count (40 CFR 745.83).

Certification comes from EPA, or from the state where EPA has authorized the state to run the program.

The Census Bureau groups construction by decade, so the share built before 1978 lies between the share built before 1970 (39.1%) and the share built before 1980 (50.0%).

Homes built before 1980 in places near Green Brook Township

Nearest places with a published estimate, compared with Green Brook Township
Place	Distance	Homes built before 1980	Compared with this place
Green Brook Township	—	50.0% (±10.6 points)	—
Dunellen Borough	1.3 mi	87.6% (±16.0 points)	Higher
Middlesex Borough	2.2 mi	72.5% (±8.7 points)	Higher
North Plainfield Borough	2.6 mi	85.6% (±8.0 points)	Higher
Warren Township	2.8 mi	40.2% (±5.5 points)	Not measurably different
Plainfield	3.6 mi	84.7% (±4.7 points)	Higher
Watchung Borough	3.7 mi	59.7% (±11.6 points)	Not measurably different
Bound Brook Borough	3.8 mi	71.8% (±9.1 points)	Higher
South Plainfield Borough	4.1 mi	70.6% (±5.2 points)	Higher

Nearby places with a measurably higher figure: Dunellen Borough, NJ (87.6%), Middlesex Borough, NJ (72.5%), North Plainfield Borough, NJ (85.6%).

Distance is measured in a straight line between the Census Bureau’s internal points for each place.

Homes built before 1980 across Somerset County, place by place

Rank	Place	Homes built before 1980
6	Somerville Borough	76.1% (±7.7 points)
7	Bound Brook Borough	71.8% (±9.1 points)
8	Bernardsville Borough	70.8% (±10.7 points)
9	Peapack and Gladstone Borough	64.9% (±13.7 points)
10	Watchung Borough	59.7% (±11.6 points)
11	Raritan Borough	58.3% (±8.8 points)
12	Green Brook Township	50.0% (±10.6 points)
13	Bridgewater Township	48.4% (±3.6 points)
14	Warren Township	40.2% (±5.5 points)
15	Franklin Township (Somerset County)	36.4% (±3.3 points)
16	Far Hills Borough	35.9% (±8.4 points)
17	Branchburg Township	34.4% (±5.2 points)
18	Hillsborough Township	34.3% (±3.2 points)

Showing 13 of 21 places in Somerset County, ranked from highest to lowest.

Survey years: 2020–2024 (American Community Survey 5-year estimates).

Margins of error are at the 90% confidence level.

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Questions about Green Brook Township

How old are most homes in Green Brook Township?

50.0% of homes in Green Brook Township, NJ were built before 1980 (2020–2024 American Community Survey).

Do homes in Green Brook Township need a lead paint disclosure?

A home built before 1978 does, before it is rented or sold, unless an exemption applies (42 U.S.C. § 4852d); between 39.1% and 50.0% of homes in Green Brook Township were built before then.

Does a contractor need lead certification to work on older homes in Green Brook Township?

Yes, when the job disturbs more than 6 square feet of paint in a room or 20 square feet outside, or replaces a window: the firm must be certified and a certified renovator must direct the work under the Renovation, Repair and Painting Rule (40 CFR part 745, subpart E).

Sources

Selected Housing Characteristics (DP04), 2020–2024 ACS 5-year estimates — Green Brook township, Somerset County, New Jersey

To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) for Green Brook township, Somerset County, New Jersey (county subdivision:27510, in state:34 county:035).

Each estimate (E or PE) has a margin of error beside it (M or PM).

The API needs a free key.

Request a Census API key.

DP04_0017PE, DP04_0017PM, DP04_0018PE, DP04_0018PM, DP04_0019PE, DP04_0019PM, DP04_0020PE, DP04_0020PM, DP04_0021PE, DP04_0021PM, DP04_0022PE, DP04_0022PM, DP04_0023PE, DP04_0023PM, DP04_0024PE, DP04_0024PM, DP04_0025PE, DP04_0025PM, DP04_0026PE, DP04_0026PM

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.