Montgomery's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Montgomery, Alabama, there are 8 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

The Montgomery, AL Zoning Ordinance treats carports as accessory structures: they may not be erected in any required front or side yard, may not exceed two stories, may not cover more than 30% of any required rear yard, must be at least 5 ft from all lot lines, and at least 10 ft from any other structure on the lot. Building permits are required through the Department of Community Development.

Key details: Front/Side Yard: Not permitted. Min. Lot Line Setback: 5 ft. Min. Structure Spacing: 10 ft. Max Rear Yard Coverage: 30%. Max Stories: 2.

A carport built without a permit, encroaching into a required front or side yard, exceeding the 30% rear-yard coverage cap, or set closer than five feet from a lot line is a Zoning Ordinance violation. Enforcement is through the Department of Community Development's zoning officer and Building Official, including stop-work orders, citations, and orders to remove or modify the structure. Historic-district carports erected without ARB approval may be ordered removed even if they meet zoning setbacks.

ADU Permits

Montgomery regulates accessory structures through the city Zoning Ordinance, codified as Appendix C of the Code of Ordinances. The current ordinance does not contain a dedicated ADU-by-right framework, so accessory living quarters are reviewed as accessory uses in residential districts and require a building permit from the Montgomery Inspections Department. Alabama is a Dillon Rule state with no statewide ADU preemption. The city is rewriting its Zoning Ordinance and SmartCode through Community Development, so applicants should confirm current standards.

Key details: Authority: Zoning Ord. (Code App. C). Dedicated ADU Rules: Not yet codified. State Preemption: None (Dillon Rule). Permit Office: Montgomery Inspections (334-625-2073). Building Code: IRC via Code Ch. 5.

Constructing an ADU without a permit violates Code of Ordinances Chapter 5 and Appendix C (Zoning), triggering stop-work orders from the Inspections Department, after-the-fact permit fees, and potential daily fines under the city's general penalty provisions. Unpermitted electrical, plumbing, or gas work voids homeowner insurance and can prevent utility connection. Historic district violations carry separate Architectural Review Board enforcement and can require restoration.

ADU Impact Fees

Montgomery 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 consist of standard building, electrical, plumbing, and mechanical permit fees through the Inspections Department, plus connection fees from the Montgomery Water Works & Sanitary Sewer Board and Alabama Power if a new service is required.

Key details: General Impact Fee: None. School Impact Fee: None (Montgomery County). Permit Fees: Construction-valuation basis. Water/Sewer Tap: Water Works & Sanitary Sewer Bd.. Electric Tap: Alabama Power (only if new service).

Failure to pay required permit fees prevents permit issuance. Unpaid Water Works or Alabama Power connection fees prevent service activation. Building without permits triggers after-the-fact fees and stop-work orders from the Inspections Department, plus accruing daily fines under the city's general penalty provisions in the Code of Ordinances.

If you are coming from a city with tighter rules, you will find Montgomery gives residents more flexibility on adu impact fees.

ADU Rental Restrictions

Long-term rental of a Montgomery accessory dwelling generally requires multi-family zoning or a use variance, because single-family districts treat accessory living quarters as incidental to the main dwelling. Short-term rentals under 180 nights are subject to a Montgomery business license, the city lodgings tax of 6.5%, the Montgomery County lodging fee of $2.25 per room per day, and the Alabama state lodgings tax of 4% (outside the Mountain Lakes area). Alabama has not preempted local STR rules.

Key details: Long-Term Rental: Needs multi-family zoning (typical). STR Business License: City License & Revenue Division. City Lodgings Tax: 6.5% (stays < 180 nights). County Lodging Fee: $2.25 / room / day. State Lodgings Tax: 4% (AL Dept. of Revenue).

Operating an unlicensed STR in Montgomery violates the city's Business License Code, with administrative penalties and back-tax liability. Operating an accessory unit as a rental in a single-family zone violates Appendix C with daily fines under the city's general penalty provisions. The Alabama Department of Revenue pursues separate state lodgings-tax enforcement with interest and penalties on unpaid amounts.

ADU Owner Occupancy

The Montgomery Zoning Ordinance (Code Appendix C) does not impose an explicit citywide owner-occupancy mandate on accessory dwelling units, but accessory living quarters in single-family residential districts are typically permitted only as a use incidental to the principal dwelling occupied by the owner. Renting a separate accessory unit to an unrelated tenant generally requires multi-family zoning or a use variance from the Board of Adjustment. Alabama has not preempted local ADU rules.

Key details: Citywide Mandate: Not explicit. Single-Family Districts: Family/employee use typical. Two-Family Use: Needs higher-density zoning. State Preemption: None (Dillon Rule). Variance Path: Board of Adjustment.

Operating an accessory dwelling as an independent rental in a single-family district can be cited as a zoning violation under Appendix C with code-enforcement orders requiring cessation of the rental use. Continued violation carries daily fines under the city's general penalty provisions, and the Inspections Department can withhold or revoke the Certificate of Occupancy. Repeat violators face Municipal Court prosecution.

ADU Rules

Montgomery's zoning code addresses accessory dwelling units (ADUs) in residential districts. ADUs may be permitted as accessory uses in certain zones subject to conditions including owner occupancy and size limits.

Key details: Zoning: Permitted in certain residential zones. Owner Occupancy: Primary home must be owner-occupied. Size: Must be smaller than primary dwelling. Permit: Building permit required.

Building an unpermitted ADU may result in fines, required removal, or forced compliance with current building and zoning codes.

Shed Rules

Montgomery allows storage sheds as accessory structures in residential zones. Sheds must comply with setback requirements and may need a building permit depending on size.

Key details: Setbacks: Typically 5 feet from side/rear lines. Small Sheds: Under ~120-200 sq ft may not need permit. Large Sheds: Building permit required. Placement: Rear or side yard only, not front yard.

Sheds that violate setback requirements may be required to be moved or removed. Unpermitted large sheds may face fines.

Garage Conversions

Converting a garage to living space in Montgomery requires a building permit and must comply with zoning and building codes. The conversion must meet habitability standards and may affect required off-street parking.

Key details: Permit: Building permit required. Parking: Must maintain required off-street spaces. Habitability: Must meet building code for living space. ADU: Separate dwelling triggers ADU rules.

Unpermitted garage conversions may result in fines, required reversal of the conversion, or forced compliance with current codes.

The Bottom Line

Montgomery'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 Montgomery is broadly strict or permissive.

This guide is based on Montgomery's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.