ADU Rules in Huntsville, Alabama

Huntsville did not adopt the 2024 proposal that would have created a general Accessory Dwelling Unit (ADU) use in the Zoning Ordinance.

City Council file 2024-1506 proposed adding an ADU definition and new Article 73 standards, but the item was marked DELETED on the June 13, 2024 City Council agenda. The draft standards in that proposal therefore should not be presented as current Huntsville zoning law.

What This Means for a Secondary Dwelling

Do not rely on the former version of this page's claims that Huntsville currently allows a detached or attached ADU with a specific maximum floor area, height, parking space, or owner-occupancy rule. Those figures came from a proposal that was not adopted.

For a project involving a second kitchen, in-law suite, converted garage, detached accessory structure, or other space intended for independent living:

1. confirm the parcel's zoning district;
2. describe the proposed use to Huntsville Zoning Administration;
3. ask which current use classification applies;
4. verify whether a variance or special exception is required; and
5. obtain the required building/trade permits before construction.

Accessory Structures Are Not Automatically Dwelling Units

Huntsville's current residential construction FAQ says accessory structures require a permit, generally must be in the rear yard, and must meet accessory-structure separation and setback rules. It also limits plumbing in an accessory structure to one commode and one lavatory.

Those accessory-building rules should not be read as permission to create an independent dwelling unit.

Current Sources to Check

• Huntsville Zoning Ordinance — the City states the online ordinance was updated April 9, 2026.
• Huntsville Zoning Administration — 256-564-8008.
• Huntsville City Council file 2024-1506 — confirms the 2024 ADU amendment was proposed but deleted before adoption.
• Inspection Department — confirm the building and trade permits required for any approved conversion or new structure.

Disclaimer: Zoning amendments can be introduced again. Verify the ordinance in effect on the date of your application rather than relying on an old proposal or third-party ADU summary.