How old are the homes in Thornbury Township (Chester County), PA?

Name: Age of homes in Thornbury Township (Chester County), PA, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

27.4% (±7.0 points) of the homes in Thornbury Township (Chester County), PA were built before 1980 (2020–2024 American Community Survey).

4.2% were built before 1940.

6.3% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 27.4% (±7.0 points)
Built before 1940: 4.2%
Built 2010 or later: 6.3%

When the homes in Thornbury Township (Chester County) were built

Housing units by year structure built, 2020–2024
Year built	Thornbury Township (Chester County)	Chester County	Pennsylvania	United States
2020 or later	0.5% (±0.9 points)	2.5%	1.0%	2.0%
2010 to 2019	5.8% (±3.1 points)	8.2%	5.1%	9.4%
2000 to 2009	28.5% (±6.9 points)	15.6%	8.1%	13.6%
1990 to 1999	26.8% (±5.8 points)	13.9%	8.9%	12.4%
1980 to 1989	11.0% (±4.1 points)	14.9%	9.6%	12.9%
1970 to 1979	11.5% (±4.2 points)	13.7%	12.4%	14.2%
1960 to 1969	3.2% (±1.9 points)	8.2%	9.9%	9.9%
1950 to 1959	8.1% (±3.8 points)	7.7%	13.0%	9.5%
1940 to 1949	0.4% (±0.7 points)	2.7%	7.0%	4.4%
1939 or earlier	4.2% (±3.5 points)	12.6%	25.0%	11.7%

In Thornbury Township (Chester County), the share of homes built before 1980 is lower than in Chester County (44.9%).

It is also lower than in Pennsylvania (67.3%).

It is lower than the national figure (49.7%).

In Chester County, Thornbury Township (Chester County) ranks 62 of 73 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 2513 of 2,558.

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 (15.9%) and the share built before 1980 (27.4%).

Homes built before 1980 in places near Thornbury Township (Chester County)

Nearest places with a published estimate, compared with Thornbury Township (Chester County)
Place	Distance	Homes built before 1980	Compared with this place
Thornbury Township (Chester County)	—	27.4% (±7.0 points)	—
Westtown Township	1.1 mi	46.7% (±7.2 points)	Higher
Dilworthtown	1.7 mi	17.3% (±15.3 points)	Not measurably different
Thornbury Township (Delaware County)	2.1 mi	30.0% (±7.4 points)	Not measurably different
Birmingham Township	3.0 mi	26.7% (±7.6 points)	Not measurably different
West Chester	3.5 mi	75.1% (±6.6 points)	Higher
West Goshen Township	4.0 mi	53.3% (±5.4 points)	Higher
Chadds Ford Township	4.2 mi	44.3% (±11.2 points)	Higher
Concord Township (Delaware County)	4.2 mi	28.2% (±5.7 points)	Not measurably different

Nearby places with a measurably higher figure: Westtown Township, PA (46.7%), West Chester, PA (75.1%), West Goshen Township, PA (53.3%).

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

Homes built before 1980 across Chester County, place by place

Rank	Place	Homes built before 1980
56	West Caln Township	33.2% (±5.6 points)
57	East Caln Township	32.8% (±8.9 points)
58	Uwchlan Township	31.6% (±4.4 points)
59	East Nottingham Township	27.8% (±6.3 points)
60 (tie)	Elverson	27.6% (±8.0 points)
60 (tie)	Franklin Township (Chester County)	27.6% (±8.7 points)
62	Thornbury Township (Chester County)	27.4% (±7.0 points)
63	Charlestown Township	27.3% (±9.6 points)
64	Honey Brook Township	27.0% (±8.2 points)
65	East Bradford Township	26.9% (±5.8 points)
66	Birmingham Township	26.7% (±7.6 points)
67	West Pikeland Township	26.4% (±7.1 points)
68	London Grove Township	26.2% (±7.9 points)

Showing 13 of 73 places in Chester 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 Thornbury Township (Chester County)

How old are most homes in Thornbury Township (Chester County)?

27.4% of homes in Thornbury Township (Chester County), PA were built before 1980 (2020–2024 American Community Survey).

Do homes in Thornbury Township (Chester County) 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 15.9% and 27.4% of homes in Thornbury Township (Chester County) were built before then.

Does a contractor need lead certification to work on older homes in Thornbury Township (Chester County)?

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 — Thornbury township, Chester County, Pennsylvania

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 Thornbury township, Chester County, Pennsylvania (county subdivision:76568, in state:42 county:029).

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.