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Additional Dwelling Unit Preapproval Applications

Published by data.cityofchicago.org | City of Chicago | Catalog Last Checked: April 04, 2026 at 08:56 PM | Dataset Last Updated: April 02, 2026
Applications for preapprovals for Additional Dwelling Units (ADUs) received by the Department of Housing pursuant to the December 2020 ADU Ordinance. After issuance of an ADU preapproval, the owner must obtain a building permit from the Department of Buildings before constructing an ADU. For a map of the eligible areas, please see https://data.cityofchicago.org/d/n8dk-kjjn. For more information about ADUs in Chicago, visit http://www.chicago.gov/ADU.

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