Birmingham's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Birmingham, Alabama, there are 9 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Carport Rules

In Birmingham, a carport located in any yard other than the rear yard must be attached to the principal structure and built of materials compatible with the principal structure. Carports in the rear yard are treated as accessory buildings.

Key details: Code Section: Ch. 1, Art. III, Sec. 20; Ch. 3, Art. I, Sec. 6. Non-Rear Yard: Must be attached to principal structure. Materials: Compatible with the principal structure.

Noncompliant carports are zoning violations enforced by the Department of Planning, Engineering and Permits, beginning with a Zoning Violation Notice (commonly 14 working days) and potentially escalating to Environmental Court fines and, upon misdemeanor conviction, jail.

Tiny Homes

Birmingham has no separate 'tiny home' ordinance; a detached tiny home on a residential lot is regulated as an accessory dwelling unit, capped at 800 square feet (or the size of the primary dwelling), limited to one per lot, and allowed only in specified districts.

Key details: Code Section: Ch. 3, Art. I, Sec. 4(32); Ch. 4, Art. IV, Sec. 2.B. Max Size: 800 sq ft or size of primary dwelling, whichever is less. State Law: No Alabama statewide tiny-home/ADU statute; local control.

An unpermitted tiny home used as a dwelling is a zoning violation enforced by the Department of Planning, Engineering and Permits via a Zoning Violation Notice; unresolved cases proceed to Environmental Court with possible fines and, upon misdemeanor conviction, jail.

ADU Permits

Birmingham regulates accessory dwelling units (ADUs) through the Birmingham Zoning Ordinance (maintained separately from the General Code) and general building requirements in Code of Ordinances Title 1 Chapter 6 (Buildings). Alabama is a Dillon Rule state with no statewide ADU preemption — local zoning controls. ADUs require a building permit through the Birmingham Department of Planning, Engineering and Permits and must comply with the International Residential Code adopted by the Alabama Building Commission and the City.

Key details: Authority: Birmingham Zoning Ordinance. State Preemption: None (Dillon Rule). Permit Office: Planning, Engineering and Permits. Building Code: IRC (Code Title 1 Ch. 6). Historic Districts: Additional COA required.

Constructing an ADU without a permit violates Code Title 1 Chapter 6 and the Birmingham Zoning Ordinance, triggering stop-work orders from the Department of Planning, Engineering and Permits, after-the-fact permit fees, and potential daily fines under the general penalty in Code Sec. 1-1-6. Unpermitted electrical, gas, and plumbing work voids homeowner insurance and can trigger utility shutoff. Historic district violations carry separate Design Review Committee enforcement.

ADU Owner Occupancy

The Birmingham Zoning Ordinance does not impose an explicit citywide owner-occupancy mandate on every ADU, but accessory living quarters in low-density Residence districts (R-1, R-2, R-3) are typically permitted only for family members or domestic employees of the household occupying the principal dwelling. Rental of an ADU to an unrelated tenant generally requires higher-density residential zoning. Alabama has not preempted local ADU rules.

Key details: Citywide Mandate: Not explicit. R-1 to R-3 Districts: Family/employee use typical. Two-Family Use: Needs R-5 or higher. State Preemption: None (Dillon Rule). Variance Path: Board of Zoning Adjustment.

Operating an accessory dwelling as an independent rental in a single-family Residence district can be cited as a zoning violation under the Birmingham Zoning Ordinance, with code-enforcement orders requiring cessation of the rental use. Continued violation carries daily fines under the general penalty in Code Sec. 1-1-6. Repeat violators face Municipal Court prosecution.

ADU Impact Fees

Birmingham does not impose a general residential impact fee on accessory dwelling units. Alabama law does not broadly authorize municipal residential impact fees outside specific statutory grants. ADU costs include standard building, electrical, plumbing, and mechanical permit fees through the Birmingham Department of Planning, Engineering and Permits plus Birmingham Water Works Board and Alabama Power tap or capacity fees if a new service is required.

Key details: General Impact Fee: None. School Impact Fee: None (Jefferson County). Permit Fees: Construction-valuation basis. Utility Tap Fees: Only if new service. Property Tax: Reassessed after build.

Failure to pay required permit fees prevents permit issuance. Unpaid Birmingham Water Works tap fees prevent service connection. Building without permits triggers double permit fees as an after-the-fact assessment, plus daily fines under the general penalty in Code Sec. 1-1-6.

The rules around adu impact fees in Birmingham lean permissive, but that does not mean anything goes.

ADU Rental Restrictions

Long-term rental of a Birmingham ADU generally requires R-5 or higher residential zoning because R-1 through R-4 districts treat the accessory dwelling as incidental to the main dwelling. Short-term rentals under 30 days are regulated by the Birmingham General Code Title 5 (Business Licenses) and the city lodgings tax provisions, requiring a business license and collection of city, county, and state lodgings taxes. Alabama has not preempted local STR rules.

Key details: Long-Term Rental: Needs R-5+ zoning (typical). STR License: Code Title 5 (Business License). City Lodgings Tax: 6.5% on STR rentals. County Lodgings Tax: 3% (Jefferson County). State Lodgings Tax: 4% (standard rate).

Operating an unlicensed STR in Birmingham violates Code Title 5 (Business Licenses) and the lodgings tax provisions, with administrative penalties and back-tax liability. Operating an ADU as a rental in a single-family zone violates the Birmingham Zoning Ordinance, with daily fines under the general penalty in Code Sec. 1-1-6. The Alabama Department of Revenue pursues separate state lodgings tax enforcement.

Garage Conversions

Converting a detached garage or other accessory building into living space is treated as an accessory dwelling in Birmingham. It is permitted only in specified districts, limited to one per lot, capped at 800 square feet, and must meet the Ordinance's Design Standards with access from an alley or approved driveway.

Key details: Code Section: Ch. 1, Art. III, Secs. 9 and 11; Ch. 4, Art. IV, Sec. 2.B. Max Size: 800 sq ft or size of primary dwelling, whichever is less. Units Per Lot: One accessory structure as a dwelling. Permit: Required before remodeling or change of use.

Operating an unpermitted garage conversion as a dwelling is a zoning violation. The Department issues a Zoning Violation Notice (commonly 14 working days), and unresolved cases proceed to Environmental Court, where a Municipal Judge may fine the owner and impose jail upon misdemeanor conviction.

ADU Rules

Birmingham permits one accessory dwelling unit per lot in specified districts (D-4, D-5, UN, MU and certain commercial zones), capped at 800 square feet or the size of the primary dwelling, whichever is less. Access must be from an alley or approved driveway.

Key details: Code Section: Ch. 1, Art. III, Sec. 9; Ch. 4, Art. IV, Sec. 2.B. Max ADU Size: 800 sq ft or size of primary dwelling, whichever is less. Units Per Lot: One accessory structure used as a dwelling. Access: From an alley or approved driveway.

Zoning violations are enforced by the Department of Planning, Engineering and Permits. A Zoning Violation Notice typically allows 14 working days to correct; uncorrected violations can lead to a summons to Environmental Court, where a Municipal Judge may fine the owner and/or order confinement in the Municipal Jail upon misdemeanor conviction.

Shed Rules

Accessory buildings such as sheds may be built in a required rear yard but may not occupy more than 30 percent of the required rear yard and must be at least three feet from any side or rear lot line in dwelling districts. A shed cannot be built until construction of the principal building has commenced.

Key details: Code Section: Ch. 3, Art. I, Sec. 6; Ch. 3, Art. I, Sec. 4(5); Ch. 1, Art. III, Sec. 8. Side/Rear Setback: Minimum 3 ft from side or rear lot line (dwelling districts). Rear Yard Coverage: Max 30% of required rear yard. Alley Setback: 3 ft (5 ft if garage doors open to alley).

Enforced by the Department of Planning, Engineering and Permits. Owners are notified by a Zoning Violation Notice (commonly 14 working days to comply); continued noncompliance can result in a summons to Environmental Court, where a Municipal Judge may impose fines and, upon misdemeanor conviction, jail.

The Bottom Line

Birmingham's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Birmingham is broadly strict or permissive.

These rules come from Birmingham's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.