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Additional Dwelling Unit Preapproval Applications - Historical

Published by data.cityofchicago.org | City of Chicago | Catalog Last Checked: May 18, 2026 at 04:04 PM | Dataset Last Updated: May 11, 2026
This dataset has been retired and is historical-only. We anticipate launching a new dataset with current data shortly. -- 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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