Accessory dwelling units (ADUs) are once again a hot topic, as communities across the United States face housing shortages and rising housing costs. For planners and policymakers attempting to facilitate ADU development, it is important to understand the homeowners who do not yet have one. Yet there is remarkably limited research on whether those homeowners are open to building an ADU, what motivations and obstacles they perceive regarding adding one, and why some homeowners do not want to build one at all. The researchers surveyed 502 single-family homeowners in the Sacramento (CA) metropolitan area to investigate those three questions. The findings suggest that up to 47% of single-family detached homeowners in the city of Sacramento could be open to building an ADU. Homeowners’ top-ranked motivation for adding one was housing themselves, family, or friends in the future. Cost-related concerns ranked as the biggest perceived obstacles. Homeowners who did not want an ADU cited a mixture of logistical challenges and potentially more immutable personal preferences.
