ADU Rules in Alabaster, Alabama

Alabaster is a suburban city in Shelby County, south of Birmingham. As a largely residential community, ADU regulations reflect the city's focus on maintaining single-family neighborhood character. Many subdivisions also have HOA restrictions that may limit or prohibit ADUs.

Permitted ADU Types

• Detached ADU: Allowed in select zones; may require conditional use in others
• Attached ADU: Addition to primary home with separate entrance
• Garage Conversion: Subject to HOA approval and zoning standards

Size Limits

Setbacks

• Front: Must meet base zone standard (typically 25–30 ft)
• Side: 5 feet minimum
• Rear: 10 feet minimum
• Separation from primary: 10 feet minimum

Height

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

HOA Restrictions

Many Alabaster neighborhoods are governed by HOAs. Always check your deed restrictions and obtain HOA approval before planning an ADU.

Owner Occupancy

Owner occupancy of the primary dwelling or ADU is required under the city's zoning regulations.

Parking

One additional off-street parking space is required per ADU.

Permit Process

1. HOA check: Review deed restrictions, obtain HOA approval if needed
2. Zoning check: Confirm eligibility with Alabaster Planning
3. Submit plans: Site plan and architectural drawings
4. Planning review: Compliance review
5. Building permit: Issued by Building Department
6. Inspections: Required at each phase
7. Certificate of Occupancy: Required before occupancy

Contact

Alabaster Planning & Zoning Department 1953 Municipal Way, Alabaster, AL 35007 Phone: (205) 663-6155 Website: cityofalabaster.com/departments/planning

Disclaimer: Verify current requirements with the Alabaster Planning & Zoning Department and your HOA before starting any project.