ADU Rules in Birmingham, AL (2026)
ADU rules, permit requirements, size limits, and fees for Birmingham, AL. Source-cited from official municipal code.
Whether ADUs are allowed in Birmingham, AL has not been confirmed — see the official source before proceeding.
Whether Birmingham, AL permits accessory dwelling units (ADUs) has not been confirmed from an official source. ADUs — also called granny flats, in-law units, or secondary suites — are secondary housing units on a single-family or multifamily lot. Contact the local building department at (205) 254-2211 to verify current ADU rules before proceeding, as regulations may have changed since this data was last reviewed.
ADU Size Limits
ADU Size Limits in Birmingham: Detached ADU: size varies by zoning — see official source (max height: varies — see official source). Attached ADU: size varies by zoning — see official source.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | See official source | See official source |
| Attached ADU | See official source | See official source |
Permit Fees
ADU Permit Fees in Birmingham: Plan check fee: Varies. Building permit fee: Varies. Impact fees: None. School fees: None or N/A. Total estimated permit cost: Varies.
| Fee Type | Amount |
|---|---|
| Plan Check | $100–$600 |
| Building Permit | Based on construction value — typically $500–$2,200 |
| Impact Fees | Birmingham charges utility connection fees through Birmingham Water Works (BWW) and Alabama Power |
| School Fees | None |
| Total Estimate | See official source |
Permit Timeline
Birmingham ADU Permit Timeline: Permit timeline has not been confirmed — contact the department for current processing times. Apply through the local building department online permit portal. Phone: (205) 254-2211.
Setback Requirements
ADU Setback Requirements in Birmingham: Front setback: follows zone standard. Side setback: no minimum. Rear setback: no minimum.
Parking Requirements
Parking Requirements: Parking requirements have not been confirmed — see official source.
Restrictions & Requirements
- ADU must be on same lot as primary single-family dwelling
- Lot must meet minimum size requirements for the R zone
- ADU cannot be separately conveyed from primary parcel
- Total lot coverage must comply with zone limits
- STR registration required if ADU is used for short-term rental
- Must comply with Alabama Residential Building Code
How Many ADUs Are Allowed?
Number of ADUs Allowed in Birmingham: Single-family lots: not confirmed — see official source. Multifamily properties: not confirmed — see official source.
- Single-Family Lots
- 1 ADU per single-family lot in qualifying R zones
- Multifamily Properties
- Additional units permitted in R-5 through R-7 zones
Statewide Preemption
ADU Preemption
We could not confirm a statewide ADU preemption statute for Alabama.
View Alabama preemption detailsFrequently Asked Questions
Can I build an ADU in Birmingham?
Yes. Birmingham, AL allows accessory dwelling units. On a single-family lot you can build 1 ADU per single-family lot in qualifying R zones.
How big can an ADU be in Birmingham?
The maximum size for a detached ADU in Birmingham is 800 square feet.
How long does it take to get an ADU permit in Birmingham?
The typical ADU permit timeline in Birmingham is Birmingham Department of Planning, Engineering and Permits: typically 4-8 weeks for residential permits. Construction typically 4-14 months.. Total estimated permit fees are $1,200–$5,500 total fees.
Do I need extra parking for an ADU in Birmingham?
Birmingham parking rules for ADUs: 1 parking space required per ADU. Birmingham is auto-dependent — MAX Transit bus service is available but limited. No parking waivers for transit proximity in most residential zones.
Do I have to live on-site to have an ADU in Birmingham?
Owner-occupancy requirement in Birmingham: Birmingham does not impose owner-occupancy requirements for ADU approval. Both units may be independently rented.
Source: Birmingham Zoning Ordinance — Accessory Dwelling Unit provisions. Last verified April 6, 2026. View source