2011 Housing Planning Study - Inventory Report

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accelerated between 2003 and 2006, and then slowed again in the last three years of the decade. If we look at the number of units added each year, we get a better idea of how Hawaii's housing stock grew. ACS data allow us to estimate that pattern for the last decade. Figure 2 shows added units for each of Hawaii's four counties for the last ten years. Figure 3: Total Housing Units, New Units Added, 2000-2009 9,000 —Honolulu 8,000 —Hawaii -----Maui 7,000 -----Kauai State 6,000 5,000 4,000 3,000 2,000 ------ 1,000 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Source: ACS Across the State, these data show that the housing stock grew rapidly from about 2003 to 2006, and then dropped notably until 2009. The number of units added in 2009 is estimated to be fewer than in 2001 before the run-up began. Figure 2 also suggests that the peak period for housing stock growth was different for each island. Honolulu and Maui peaked in 2005. Hawaii Island and Kauai peaked about a year later. The dotted lines in Figure 3 show some best-guess estimates for the years before ACS data were available for each series. In the years after 2005, ACS provides solid data points. OTHER ESTIMATES ACS data also allows us to estimate total occupied housing units and units added each year, since 2002 for Honolulu and since 2005 for other counties. Occupied housing units are defined as total housing units minus vacant housing units. The data in the Appendix Tables IA-1 through IA-5 suggest that ACS may have been under-counting vacancies in the first few years of the survey, but the counts from 2006 to date have remained fairly consistent. Data for total Hawai'i Housing Planning Study,2011 —Inventory Report Page 15 0 SMS, Inc. November,2011