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Age of Housing

Variable Definitions:

Housing Units by Decade: The percentage of housing units in a given area that were built in the following time periods: 

  • Before 1979
  • 1980-1989
  • 1990-1999
  • 2000-2009
  • 2010 or Later

American Community Survey (ACS), 5-year estimates, Table B25034

Years Available*:
2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022

*Note: Each year of available data shown above is a 5-year estimate, or an average of data collected over a five year period. 5-year estimates are used to increase the reliability of the data at small geographies like neighborhoods and census tracts. The years shown on the NDSC map represent the final year of the five year average (e.g. “2010” represents 2006-2010 data, “2011” represents 2007-2011 data, and so on). For the most impactful comparison of data over time, the ACS recommends comparing non-overlapping years (e.g. 2010-14 with 2015-19).

Why are these variables important to measure?

The number of housing units constructed in a given year determines the age of the housing stock. A key determinant of the renovation market is the age of the home stock. Compared to new houses, older ones are less energy-efficient and need more upkeep and restoration over time.

Long-term demand for new constructions is anticipated to increase due to the aging housing stock as older homes deteriorate and need to be replaced. Throughout the first half of the 20th century, Los Angeles’ landlords, construction companies, and real estate developers constructed a wide range of housing styles in significant quantities, from house courts to blocks of single-family houses, mainly in the center of Los Angeles. Later, fast suburban sprawl and spacious single-family homes came to represent postwar prosperity, such as the San Fernando Valley (SACRPH, n.d)

Americans across the country are facing an interesting challenge; inadequate housing stock that fails to meet demand. Since the Great Recession, the U.S. economy has greatly expanded but housing construction has failed to supply residents. Freddie Mac, renowned loan mortgage corporation, describes that the current rate of demand is approximately 1.62 million housing units per year—370,000 units more per year than the current rate of supply. Within the City of LA, the housing crisis has led to many Angelenos leaving the city or being forced into homelessness. Developers and the city of Los Angeles have turned to innovative ways to create new housing, taking advantage of unused lots and space. With a growing population of almost 4 million, current infrastructure cannot support Los Angeles residents. 
Written by Rediet Retta


Khater, S., Kiefer, L., Atreya, A & Yanamandra, V. “The Major Challenge of Inadequate U.S. Housing Supply.” Freddie Mac Economic & Housing Research Group, 2018. Link 

Southern California Association of Governments – SCAG. “Local Housing Data for the City of Los Angeles.” Link

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