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ABAG Frequently Asked Questions about RHNA (July 2020) 6 <br />the estimate of the total number of households that will need a housing unit in 2030 (which is <br />the end date of the projection period for the Bay Area’s RHNA cycle). <br /> <br />HCD Process for Identifying Regional Housing Needs Determination (RHND) <br /> The total number of projected households is then adjusted using the factors related to vacancy <br />rate, overcrowding, and an estimate of the need for replacement housing for units that were <br />demolished or lost. This results in a forecast of the number of housing units that will be needed <br />to house all households in the region in 2031. The number of existing occupied housing units is <br />subtracted from the total number of housing units needed, which results in the number of <br />additional housing units necessary to meet the housing need. The final step is an adjustment <br />related to cost-burdened households, which results in the RHND for the region. <br /> <br />RHNA METHODOLOGY <br />What is the RHNA methodology? <br />At its core, RHNA is about connecting regional housing needs with the local planning process and <br />ensuring local Housing Elements work together to address regional housing challenges. Working <br />with the Housing Methodology Committee, ABAG develops a methodology, or formula, that <br />shares responsibility for accommodating the Bay Area’s Regional Housing Needs Determination <br />(RHND) by quantifying the number of housing units, separated into four income categories, that <br />will be assigned to each city, town, and county to incorporate into its Housing Element. <br /> <br />813