Dataset
Additional Dwelling Unit Preapproval Applications
chicago.j4h8-ug9m
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About
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. Due to changes in the underlying data, the previous version of <a href="https://data.cityofchicago.org/Buildings/Additional-Dwelling-Unit-Preapproval-Applications-/xbwc-ntpx/about_data" target="_blank" rel="noopener noreferrer">ADU Preapproval Applications Dataset</a> is being retired. The historical dataset is still available for viewing but will no longer be updated. For a map of the eligible areas, please see https://data.cityofchicago.org/Buildings/Additional-Dwelling-Unit-Areas-Map/n8dk-kjjn For more information about ADUs in Chicago, visit http://www.chicago.gov/ADU.
Cite as: City of Chicago. Additional Dwelling Unit Preapproval Applications. https://data.cityofchicago.org/d/j4h8-ug9m
- Publisher
- City of Chicago
- Tier
- Official
- Covers
- not stated
- Places
- Chicago
- Updated
- irregular
- Last modified
- 2026-11-08
- Units
- not stated
- License
- City of Chicago Data Portal Terms of Use
- Method
- https://www.chicago.gov
Columns
| Name | Type | Description |
|---|---|---|
| zoning | text | Project Address Zoning Class |
| applicant_unit | text | Applicant Mailing Address Unit |
| alderman | text | Name of the Alderman for the WARD at the time of submission. |
| location | point | The location of the property in a format that allows for mapping and other geographic analysis on this data portal. |
| street_direction | text | Project Address Street Direction |
| has_one_applied_previously | checkbox | Indicates whether, to the submitter's knowledge, an ADU application has previously been submitted for this address. |
| submission_date | calendar_date | Application submissions date |
| applicant_first_name | text | Applicant First Name |
| acknowledge_will_require_affordable_adus | checkbox | Acknowledge that the property will require affordable ADUs. |
| applicant_zip | text | Applicant Mailing Address Zip |
| zip | text | Project Address Zip Code |
| max_number_of_adu_allowed | number | Maximum number of conversion units allowed |
| applicant_state | text | Applicant Mailing Address State |
| status | text | Application current status |
| latitude | number | The latitude of the property |
| proof_of_residency_yn | checkbox | References if proof of residency documentation was attached to the application |
| max_number_coach_house_units_allowed | number | Maximum number of coach house units allowed. Always 1 if applying for coach house. |
| adu_applying_for | number | Number of ADUs applying for. |
| user_amended_date | calendar_date | Date when the application was last updated or amended. |
| property_owner_yn | checkbox | Is the applicant the property owner? |
| submitter_role | text | If not the property owner, then what is the role of the submitter? |
| affidavit_yn | checkbox | References if Annual Affordability Compliance Affidavit was attached to the application. |
| longitude | number | The longitude of the property |
| principal_building_built_year | number | Year the principal building was built. Only applicable if applying for a conversion unit. |
| street_name | text | Project Address Street Name |
| address | text | Project Address |
| action_date | calendar_date | Date when the current application status was assigned. |
| property_owner_first_name | text | Property owner first name if applicant is not the property owner. |
| property_owner_occupied | checkbox | Indicates whether the property is owner-occupied. |
| applicant_last_name | text | Applicant Last Name |
| applicant_address | text | Applicant Mailing Address. Mailing address of the individual completing the application. The individual applying for the ADU pre-certification is not required to be the owner of the property. |
| number_affordable_units_required | number | Number of affordable units required. For property owners adding two or more ADUs, half of the new ADUs (rounding down) must be rented to a tenant making 60% of the Area Median Income (AMI) or less, at a rate considered to be affordable. |
| recording_deed_yn | checkbox | References if ADU Affordability Covenant was attached to the application. |
| conversion_unit | checkbox | Indicates whether the application is for a conversion unit. |
| labor_requirement | checkbox | Acknowledgement of the labor requirement for coach house applications. Always 'Yes' for coach house applications. |
| principal_building_requirement | checkbox | Acknowledgement of the principal building requirement for coach house applications. Always 'Yes' for coach house applications. |
| id | number | Application unique identifier |
| dwelling_units_in_lot | number | Number of dwelling units that are currently on the lot or will be on the lot once the principal building is constructed. Proposed ADUs are not included in this count. |
| fee_affordable_units_required | number | Fee required for affordable units |
| acknowledge_no_shared | checkbox | Acknowledgement that ADUs cannot be used for short-term leases or vacation rentals (e.g., Airbnb). Always 'Yes' unless the application was canceled before submission. |
| coach_house | checkbox | Indicates whether the application is for a coach house. |
| property_owner_last_name | text | Property owner last name if applicant is not the property owner. |
| street_number | text | Project Address Street Number |
| ward | number | Project Address Ward |
| unit | text | Project Address Unit |
| applicant_city | text | Applicant Mailing Address City |