Can I Build ADU in Birmingham, AL? (2026)
Find out if you can build a adu in Birmingham, AL. Rules, permit requirements, costs, and next steps.
Yes, ADUs are allowed in Birmingham, AL. California state law ensures by-right approval.
An Accessory Dwelling Unit (ADU) is a secondary housing unit on a residential lot — also called a granny flat, in-law suite, or backyard cottage. In Birmingham, AL, ADUs are permitted by right under state law, making them one of the most accessible ways to add housing on your property. ADUs can be detached, attached to the main home, or created by converting an existing garage or accessory structure.
ADU Rules in Birmingham
ADU Rules in Birmingham: Detached ADU max size: 800 sq ft. Attached ADU max size: 40% of primary dwelling floor area. Setbacks: 5 ft side, 5 ft rear. Owner-occupancy: Birmingham does not impose owner-occupancy requirements for ADU approval. Both units may be independently rented..
Costs & Fees
ADU permits in Birmingham: Total estimated permit cost: $1,200–$5,500 total fees. Contact the City of Birmingham Department of Planning, Engineering and Permits for current fee schedule.
Timeline
Birmingham Department of Planning, Engineering and Permits: typically 4-8 weeks for residential permits. Construction typically 4-14 months.
Next Steps
Next steps for building an ADU in Birmingham: 1. Review full ADU rules including size limits, setbacks, and parking. 2. Apply for an ADU permit through the City of Birmingham Department of Planning, Engineering and Permits at https://www.birminghamal.gov/building-permits. 3. Hire a licensed contractor familiar with AL ADU requirements.
City of Birmingham Department of Planning, Engineering and Permits
Phone: (205) 254-2677
Website: https://www.birminghamal.gov/building-permits
Online Permits: https://www.birminghamal.gov/building-permits
Frequently Asked Questions
What is Birmingham's relationship to Jefferson County for permitting?
The City of Birmingham and Jefferson County are separate jurisdictions. If your property is within Birmingham city limits, you use the City of Birmingham Department of Planning, Engineering and Permits. If your property is in unincorporated Jefferson County (or in suburban cities like Hoover, Vestavia Hills, Mountain Brook, or Homewood), you work with Jefferson County or your specific municipality. Permitting systems, zoning rules, and fee schedules differ between these jurisdictions. Always confirm which jurisdiction applies to your specific address.
Can I build an ADU on my Birmingham property?
Yes. Birmingham allows accessory dwelling units on single-family lots under the Birmingham Zoning Ordinance. Maximum size is typically 800 sqft for detached ADUs. Alabama has no statewide ADU law — Birmingham's local ordinance governs. Building permit from Department of Planning, Engineering and Permits required. Birmingham Water Works and Alabama Power connection fees apply for independent utility service. No owner-occupancy requirement.
What are Birmingham's Civil Rights historic sites and do they affect property development?
Birmingham has nationally significant Civil Rights sites near downtown, including the 16th Street Baptist Church (National Historic Landmark, site of the 1963 bombing), Kelly Ingram Park, and the Birmingham Civil Rights Institute. These are in the Birmingham Civil Rights historic district — one of the most significant historic sites in American history. Development near designated landmarks and in historic districts requires coordination with the Landmark Preservation Board and may require Certificate of Appropriateness for exterior changes.
What are Birmingham's STR (Airbnb) requirements?
Birmingham requires a Short-Term Rental License for rentals under 30 days. Annual fee is approximately $200. License number must appear in all booking platform listings. Occupancy limits (2 per bedroom), noise ordinance, and safety requirements apply. Alabama's 4% state lodgings tax plus Jefferson County and Birmingham local lodgings taxes apply to STR income.
How does UAB affect Birmingham's housing market?
The University of Alabama at Birmingham (UAB) is Birmingham's largest employer, with over 23,000 employees in healthcare, research, and education. UAB's Medical Center and campus complex in the Southside neighborhood drives significant rental demand in Five Points South, Avondale, and adjacent neighborhoods. UAB's continued investment in the Birmingham Medical District has been a major stabilizing force for Birmingham's urban core, contributing to real estate appreciation in formerly disinvested neighborhoods.
Source: City of Birmingham Department of Planning, Engineering and Permits — Building Regulations. Last verified April 6, 2026. View source