How old are the homes in Cedar Knolls, NJ?

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

50.2% (±17.6 points) of the homes in Cedar Knolls, NJ were built before 1980 (2020–2024 American Community Survey).

3.4% were built before 1940.

8.3% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 50.2% (±17.6 points)
Built before 1940: 3.4%
Built 2010 or later: 8.3%

When the homes in Cedar Knolls were built

Housing units by year structure built, 2020–2024
Year built	Cedar Knolls	Morris County	New Jersey	United States
2020 or later	1.7% (±2.2 points)	0.9%	1.1%	2.0%
2010 to 2019	6.6% (±3.8 points)	5.2%	6.2%	9.4%
2000 to 2009	18.3% (±8.4 points)	7.5%	9.2%	13.6%
1990 to 1999	17.8% (±7.5 points)	11.3%	8.9%	12.4%
1980 to 1989	5.4% (±4.0 points)	12.6%	11.8%	12.9%
1970 to 1979	18.6% (±12.9 points)	13.5%	12.3%	14.2%
1960 to 1969	11.1% (±5.9 points)	16.0%	12.8%	9.9%
1950 to 1959	11.7% (±8.4 points)	14.7%	13.8%	9.5%
1940 to 1949	5.4% (±5.1 points)	5.8%	6.5%	4.4%
1939 or earlier	3.4% (±3.6 points)	12.4%	17.4%	11.7%

In Cedar Knolls, the share of homes built before 1980 is not measurably different from Morris County (62.4%).

It is not measurably different from New Jersey (62.8%).

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

In Morris County, Cedar Knolls ranks 23 of 27 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 160 of 252.

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 (31.6%) and the share built before 1980 (50.2%).

Homes built before 1980 in places near Cedar Knolls

Nearest places with a published estimate, compared with Cedar Knolls
Place	Distance	Homes built before 1980	Compared with this place
Cedar Knolls	—	50.2% (±17.6 points)	—
Morris Plains Borough	1.7 mi	64.8% (±9.2 points)	Not measurably different
Morristown Town	1.9 mi	59.3% (±5.7 points)	Not measurably different
Whippany	1.9 mi	57.1% (±8.2 points)	Not measurably different
Morris Township	2.6 mi	64.8% (±6.1 points)	Not measurably different
Parsippany-Troy Hills Township	3.3 mi	72.0% (±4.6 points)	Higher
Troy Hills	3.8 mi	51.3% (±9.6 points)	Not measurably different
Rainbow Lakes	3.8 mi	83.3% (±25.6 points)	Higher
Mount Tabor	3.8 mi	90.6% (±25.6 points)	Higher

Nearby places with a measurably higher figure: Parsippany-Troy Hills Township, NJ (72.0%), Rainbow Lakes, NJ (83.3%), Mount Tabor, NJ (90.6%).

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

Homes built before 1980 across Morris County, place by place

Rank	Place	Homes built before 1980
17	Millington	60.5% (±13.2 points)
18	Green Village	59.5% (±23.0 points)
19	Whippany	57.1% (±8.2 points)
20	Pompton Plains	52.4% (±8.1 points)
21	Stirling	51.5% (±16.4 points)
22	Troy Hills	51.3% (±9.6 points)
23	Cedar Knolls	50.2% (±17.6 points)
24	Oak Ridge	47.3% (±7.3 points)
25	Flanders	46.9% (±9.1 points)
26	Mount Hope	37.2% (±10.3 points)
27	Ledgewood	32.1% (±8.0 points)

Showing 11 of 27 places in Morris County, ranked from highest to lowest.

Cedar Knolls is a census-designated place: an unincorporated community the Census Bureau draws for statistics, with no municipal government of its own.

It lies inside Hanover Township, whose figures include it.

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 Cedar Knolls

How old are most homes in Cedar Knolls?

50.2% of homes in Cedar Knolls, NJ were built before 1980 (2020–2024 American Community Survey).

Do homes in Cedar Knolls 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 31.6% and 50.2% of homes in Cedar Knolls were built before then.

Does a contractor need lead certification to work on older homes in Cedar Knolls?

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 — Cedar Knolls CDP, 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 Cedar Knolls CDP, New Jersey (place:11290, in state:34).

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.