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Additional Dwelling Unit Preapproval Applications - Historical

Published by data.cityofchicago.org | City of Chicago | Catalog Last Checked: September 10, 2026 at 06:02 PM | Dataset Last Updated: September 03, 2026
This dataset has been retired and is historical-only. We have launched a new dataset with current data. -- 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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