How old are the homes in San Luis Obispo, CA?

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

57.2% (±3.5 points) of the homes in San Luis Obispo, CA were built before 1980 (2020–2024 American Community Survey).

9.2% were built before 1940.

8.2% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 57.2% (±3.5 points)
Built before 1940: 9.2%
Built 2010 or later: 8.2%

When the homes in San Luis Obispo were built

Housing units by year structure built, 2020–2024
Year built	San Luis Obispo	San Luis Obispo County	California	United States
2020 or later	2.3% (±0.6 points)	1.3%	1.3%	2.0%
2010 to 2019	5.9% (±1.2 points)	7.4%	6.5%	9.4%
2000 to 2009	10.7% (±2.0 points)	15.6%	11.2%	13.6%
1990 to 1999	9.1% (±1.4 points)	11.6%	10.1%	12.4%
1980 to 1989	14.8% (±1.9 points)	20.2%	14.9%	12.9%
1970 to 1979	21.3% (±1.9 points)	19.8%	16.8%	14.2%
1960 to 1969	12.4% (±1.7 points)	8.5%	12.5%	9.9%
1950 to 1959	9.6% (±1.3 points)	6.8%	12.4%	9.5%
1940 to 1949	4.7% (±1.4 points)	3.6%	5.4%	4.4%
1939 or earlier	9.2% (±1.5 points)	5.1%	8.9%	11.7%

In San Luis Obispo, the share of homes built before 1980 is higher than in San Luis Obispo County (43.8%).

It is not measurably different from California (56.0%).

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

In San Luis Obispo County, San Luis Obispo ranks 4 of 22 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 517 of 1,076.

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 (35.9%) and the share built before 1980 (57.2%).

Homes built before 1980 in places near San Luis Obispo

Nearest places with a published estimate, compared with San Luis Obispo
Place	Distance	Homes built before 1980	Compared with this place
San Luis Obispo	—	57.2% (±3.5 points)	—
California Polytechnic State University	2.8 mi	0.0% (±89.9 points)	Not measurably different
Los Ranchos	4.3 mi	41.7% (±16.7 points)	Not measurably different
Avila Beach	5.5 mi	15.5% (±12.0 points)	Lower
Pismo Beach	7.8 mi	34.9% (±5.4 points)	Lower
Santa Margarita	9.2 mi	24.0% (±21.4 points)	Lower
Los Osos	9.2 mi	68.4% (±7.0 points)	Higher
Grover Beach	10 mi	55.6% (±8.3 points)	Not measurably different
Arroyo Grande	11 mi	50.5% (±5.9 points)	Not measurably different

Nearby places with a measurably lower figure: Avila Beach, CA (15.5%), Pismo Beach, CA (34.9%), Santa Margarita, CA (24.0%).

Nearby places with a measurably higher figure: Los Osos, CA (68.4%).

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

Homes built before 1980 across San Luis Obispo County, place by place

Rank	Place	Homes built before 1980
1	Los Osos	68.4% (±7.0 points)
2	Cayucos	66.5% (±13.0 points)
3	Morro Bay	61.7% (±7.1 points)
4	San Luis Obispo	57.2% (±3.5 points)
5	Grover Beach	55.6% (±8.3 points)
6	Oceano	55.2% (±12.5 points)
7	Arroyo Grande	50.5% (±5.9 points)
8	Atascadero	44.0% (±4.9 points)
9	Los Ranchos	41.7% (±16.7 points)
10	Pismo Beach	34.9% (±5.4 points)

Showing 10 of 22 places in San Luis Obispo 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 San Luis Obispo

How old are most homes in San Luis Obispo?

57.2% of homes in San Luis Obispo, CA were built before 1980 (2020–2024 American Community Survey).

Do homes in San Luis Obispo 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 35.9% and 57.2% of homes in San Luis Obispo were built before then.

Does a contractor need lead certification to work on older homes in San Luis Obispo?

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 — San Luis Obispo city, California

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 San Luis Obispo city, California (place:68154, in state:06).

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.