ADU Rules in Decatur, Alabama

Decatur is an industrial and residential city along the Tennessee River in northern Alabama. The city permits accessory dwelling units (ADUs) in residential zones under its municipal code. No Alabama state law overrides local ADU regulations.

Permitted ADU Types

• Detached ADU: A standalone structure on the lot
• Attached ADU: A connected addition with its own entrance and kitchen facilities
• Outbuilding Conversion: Converting an existing accessory building to a dwelling unit

Size Limits

Setbacks

• Front: Must comply with base zone requirements
• Side: 5 feet minimum
• Rear: 10 feet minimum
• Separation from primary: 10 feet minimum

Height

• Detached ADU: Maximum 15 feet
• Cannot exceed the height of the primary dwelling

Owner Occupancy

The property owner must reside in either the primary dwelling or the ADU. Properties rented in their entirety are not eligible for an ADU under most zone classifications.

Flood Zone Note

Parts of Decatur near the Tennessee River are in FEMA flood zones. ADUs in these areas must comply with floodplain development regulations and may require elevated construction.

Parking

One off-street parking space is required for the ADU.

Permit Process

1. Zoning verification: Confirm your district allows ADUs
2. Flood zone check: Verify status with FEMA flood maps
3. Submit plans: Site plan, floor plans, elevations
4. Planning review: Zoning compliance review
5. Building permit: Apply through the Building Department
6. Inspections: Required at each construction phase
7. Certificate of Occupancy: Required before occupancy

Contact

Decatur Planning & Zoning 402 Lee Street NE, Decatur, AL 35601 Phone: (256) 341-4600 Website: decaturalabamausa.com/planning

Disclaimer: Verify current requirements with the Decatur Planning & Zoning Department before starting any project.