Beta — site is under development, information may contain errors. Read disclaimer
Zoning Guide

ADU Rules in Florence, Alabama

Last updated: Verified:

ADU Rules in Florence, Alabama

Florence is a historic city on the Tennessee River in northwest Alabama. The city permits accessory dwelling units (ADUs) in residential zones under its Zoning Ordinance. Alabama has no statewide ADU law, so Florence's local code governs entirely.

Permitted ADU Types

  • Detached ADU: A separate structure on the same residential lot
  • Attached ADU: An addition to the main house with its own entrance and kitchen
  • Carriage House: A dwelling unit above a garage or barn structure

Size Limits

ADU Type Maximum Size
Detached ADU 800 sq ft or 40% of primary dwelling
Attached ADU 40% of primary dwelling floor area
Carriage House Existing footprint

Setbacks

  • Front: Must meet base zone standard
  • Side: 5 feet minimum
  • Rear: 10 feet minimum
  • Separation from primary: 10 feet minimum for detached units

Height

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

Historic Districts

Florence has several historic districts where additional design review may be required. ADUs in historic overlay zones must be compatible with the historic character of the neighborhood.

Owner Occupancy

The property owner must reside in either the primary dwelling or the ADU as their principal residence.

Parking

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

Permit Process

  1. Zoning check: Verify eligibility and any historic overlay requirements
  2. Submit plans: Site plan, floor plans, elevations
  3. Planning review: Zoning and historic review if applicable
  4. Building permit: Applied through Building Department
  5. Inspections: All required phases must pass
  6. Certificate of Occupancy: Required before occupancy

Contact

Florence Planning Department 110 West College Street, Florence, AL 35630 Phone: (256) 760-6414 Website: florenceal.org/departments/planning

Disclaimer: Verify current requirements with the Florence Planning Department before starting any project.

More about Florence Zoning

Sources

  1. Florence Zoning Ordinance — Accessory Structures·library.municode.com·Accessed 2026-04-07·Direct link

FAQ

Are ADUs allowed in Florence, Alabama?
Yes. Florence permits accessory dwelling units in residential zoning districts. The regulations depend on your specific zone designation and lot size.
What is the maximum ADU size in Florence?
Accessory dwelling units in Florence are generally limited to 800 square feet or 40% of the primary dwelling floor area, whichever is less.
Is owner occupancy required in Florence for an ADU?
Yes. Florence requires the property owner to occupy either the primary dwelling or the ADU.