How old are the homes in Casa de Oro-Mount Helix, CA?

Name: Age of homes in Casa de Oro-Mount Helix, CA, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

79.8% (±7.0 points) of the homes in Casa de Oro-Mount Helix, CA were built before 1980 (2020–2024 American Community Survey).

3.8% were built before 1940.

1.0% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 79.8% (±7.0 points)
Built before 1940: 3.8%
Built 2010 or later: 1.0%

When the homes in Casa de Oro-Mount Helix were built

Housing units by year structure built, 2020–2024
Year built	Casa de Oro-Mount Helix	San Diego County	California	United States
2020 or later	0.6% (±0.7 points)	1.4%	1.3%	2.0%
2010 to 2019	0.4% (±0.4 points)	6.9%	6.5%	9.4%
2000 to 2009	1.4% (±1.0 points)	12.2%	11.2%	13.6%
1990 to 1999	5.3% (±2.2 points)	11.3%	10.1%	12.4%
1980 to 1989	12.4% (±2.1 points)	18.6%	14.9%	12.9%
1970 to 1979	27.2% (±4.0 points)	21.4%	16.8%	14.2%
1960 to 1969	20.2% (±3.6 points)	11.2%	12.5%	9.9%
1950 to 1959	22.2% (±3.6 points)	9.8%	12.4%	9.5%
1940 to 1949	6.4% (±1.8 points)	3.0%	5.4%	4.4%
1939 or earlier	3.8% (±2.0 points)	4.0%	8.9%	11.7%

In Casa de Oro-Mount Helix, the share of homes built before 1980 is higher than in San Diego County (49.4%).

It is also higher than in California (56.0%).

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

In San Diego County, Casa de Oro-Mount Helix ranks 1 of 50 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 145 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 (52.6%) and the share built before 1980 (79.8%).

Homes built before 1980 in places near Casa de Oro-Mount Helix

Nearest places with a published estimate, compared with Casa de Oro-Mount Helix
Place	Distance	Homes built before 1980	Compared with this place
Casa de Oro-Mount Helix	—	79.8% (±7.0 points)	—
Spring Valley	2.4 mi	59.8% (±5.8 points)	Lower
El Cajon	2.7 mi	67.5% (±3.4 points)	Lower
Rancho San Diego	2.9 mi	25.4% (±4.2 points)	Lower
La Mesa	3.1 mi	72.9% (±3.8 points)	Not measurably different
Bostonia	4.1 mi	50.3% (±6.8 points)	Lower
La Presa	4.1 mi	65.6% (±5.6 points)	Lower
Lemon Grove	4.4 mi	71.9% (±6.1 points)	Not measurably different
Granite Hills	4.6 mi	79.6% (±16.7 points)	Not measurably different

Nearby places with a measurably lower figure: Spring Valley, CA (59.8%), El Cajon, CA (67.5%), Rancho San Diego, CA (25.4%).

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

Homes built before 1980 across San Diego County, place by place

Rank	Place	Homes built before 1980
1	Casa de Oro-Mount Helix	79.8% (±7.0 points)
2	Granite Hills	79.6% (±16.7 points)
3	Del Mar	75.3% (±15.7 points)
4	La Mesa	72.9% (±3.8 points)
5	Lemon Grove	71.9% (±6.1 points)
6	Eucalyptus Hills	71.0% (±16.8 points)
7	National City	70.1% (±4.9 points)

Showing 7 of 50 places in San Diego County, ranked from highest to lowest.

Casa de Oro-Mount Helix is a census-designated place: an unincorporated community the Census Bureau draws for statistics, with no municipal government of its own.

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 Casa de Oro-Mount Helix

How old are most homes in Casa de Oro-Mount Helix?

79.8% of homes in Casa de Oro-Mount Helix, CA were built before 1980 (2020–2024 American Community Survey).

Do homes in Casa de Oro-Mount Helix 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 52.6% and 79.8% of homes in Casa de Oro-Mount Helix were built before then.

Does a contractor need lead certification to work on older homes in Casa de Oro-Mount Helix?

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 — Casa de Oro-Mount Helix CDP, 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 Casa de Oro-Mount Helix CDP, California (place:11691, 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.