Birmingham has no citywide ADU ordinance, and accessory dwellings are not permitted in its single-family districts (D-1, D-2, D-3 and the legacy E-1, R-1, R-2, R-3), so a homeowner on a single-family-zoned lot cannot get a by-right ADU permit today. The current Zoning Ordinance (July 2026 Edition, Title 1, Ch. 4, Art. IV, Sec. 2.B) does allow a 'Dwelling, Accessory' as a permitted accessory use in the D-4, D-5, UN, MU-L, MU-M, MU-H, MU-D, C-1 and C-2 districts (legacy R-4, R-4A, R-5-R-7, B-1-B-4, O&I): one accessory structure used as a dwelling per lot, alley or approved-driveway access, accessory to a single-family home or bed-and-breakfast, with no owner-occupancy or minimum-parking rule. An accessory dwelling of up to 800 sq ft (or the size of the main house, whichever is less) may exceed the usual 30%-of-required-rear-yard cap on accessory buildings; setbacks are 3 ft from side and rear lines and the district height limit is 35 ft. Building permits cost $9.50 per $1,000 of valuation ($125 minimum) with a 3-working-day residential review target and no impact fee. The city's ADU exploration launched May 11, 2026, held six town halls in June, and had produced no draft ordinance, ZAC case or Council item as of September 20, 2026.
Zoning & Size Requirements [1][2][3][4][5][6][7][8]
Sometimes — Birmingham allows ADUs, but not by right on a typical lot. Birmingham has no citywide ADU ordinance: the Planning Division's community-input process (town halls June 9-30, 2026) has produced no draft as of September 20, 2026, and no ADU item has reached the Zoning Advisory Committee or City Council in 2026. Under the current Zoning Ordinance (July 2026 Edition) a 'Dwelling, Accessory' is already a permitted accessory use in the D-4, D-5, UN, MU-L/M/H/D, C-1 and C-2 districts (legacy R-4, R-4A, R-5-R-7, B-1-B-4, O&I) but not in the single-family districts D-1, D-2, D-3 (legacy E-1, R-1, R-2, R-3).
| Allowed Zones | Permitted as an accessory use (PAC) in D-4, D-5, UN, MU-L, MU-M, MU-H, MU-D, C-1 and C-2 (Permitted Use Table 1.02.201; Ch. 4, Art. IV, Sec. 2.B). Legacy Title 2 districts crosswalk per Ch. 4, Art. I, Sec. 1.D: R-4/R-4A = D-4, R-5/R-6/R-7 = D-5, B-1/O&I = C-1, B-2 = C-2, B-3 = MU-H, B-4 = MU-D. Not permitted (X) in the single-family districts D-1, D-2, D-3 (legacy E-1, R-1, R-2, R-3), AG, industrial, PRD or MXD. Check your parcel's district at gisweb.birminghamal.gov. |
| Max Size (Detached) | No fixed cap for a permitted accessory dwelling. An ADU of 800 sq ft or the size of the primary dwelling (whichever is less) that meets design standards may cover more than 30% of the required rear yard (Ch. 3, Art. I, Sec. 4.D.32); a larger unit must stay within the 30%-of-required-rear-yard limit for accessory buildings (Sec. 6.A) and the district setbacks. |
| Max Size (Attached) | Not separately regulated: the ordinance defines an accessory dwelling as rooms within an accessory structure (Ch. 1, Art. III, def. 82). An attached second unit is a two-family dwelling, allowed only where duplexes are permitted (D-4, D-5, UN, MU; legacy R-4 at 3,000 sq ft of lot area per unit), not in D-1-D-3. |
| Max Size (JADU) | No JADU category. A second kitchen inside a single-family house makes it a two-family dwelling, which is not permitted in D-1, D-2, D-3 or legacy R-1-R-3 (Table 1.02.201; Ch. 1, Art. I, Sec. 10 joint occupancy). |
| Max Height | 35 ft district maximum in all dwelling districts (Table 1.03.101); the July 2026 Ordinance sets no separate accessory-building height limit. Height is measured from grade at the front facade to the flat-roof coping or the average of eaves and ridge (Ch. 3, Art. I, Sec. 7.B). |
| Max Units | One: 'Only one accessory structure per lot shall be utilized for a dwelling' (Ch. 4, Art. IV, Sec. 2.B.1), and it must be accessory to a single-family dwelling or bed-and-breakfast, not to a duplex or multi-family building. |
Setback Requirements [1][2][3][4][5][6][7][8]
Birmingham requires a rear setback of about 3 ft for a detached ADU, and no additional parking is required. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | Accessory buildings may stand in the required rear yard but no closer than 3 ft to the rear lot line, or 5 ft where a garage door opens onto an alley; accessory buildings of 700 sq ft or less get half the district rear setback (min. 3 ft) (Ch. 3, Art. I, Sec. 4.D.5 and Sec. 6.A). District rear setbacks: D-3, D-4, D-5 15 ft; D-2 30 ft; D-1 40 ft (Table 1.03.101). |
| Side Setback | 3 ft minimum from any side lot line for accessory buildings in dwelling districts (Ch. 3, Art. I, Sec. 6.A). Principal-building side setbacks: D-3, D-4, D-5 5 ft; D-2 7 ft one side/16 ft total; D-1 8 ft/18 ft (Table 1.03.101); half the alley width may count toward a side yard abutting an alley. |
| Front Setback | Accessory buildings must sit behind the principal structure; the reduced rear-yard rules apply only 'when located to the rear of a principal structure' and no accessory structure may be built before the principal building is started (Ch. 3, Art. I, Sec. 4.D.5; Ch. 1, Art. I, Sec. 8). District front setbacks: D-3 20 ft; D-4, D-5 15 ft; D-2 30 ft; D-1 40 ft. |
| Parking Required | No minimum parking requirement: Chapter 5 sets only maximum 'allowed' off-street spaces (single-family and two-family dwellings 2 per unit, Table 1.05.101) and has no accessory-dwelling row. Access to the accessory dwelling must be from an alley or an approved driveway (Ch. 4, Art. IV, Sec. 2.B.2). |
| Owner Occupancy | None required. The three conditions in Ch. 4, Art. IV, Sec. 2.B are one dwelling-accessory structure per lot, alley or approved-driveway access, and that the unit is accessory to a single-family dwelling or bed-and-breakfast. Absentee-owner concerns raised at the June 2026 town halls may shape any future citywide ordinance. |
| Min Lot Size | No ADU-specific minimum. District minimum lot areas for a single-family home: D-1 15,000 sq ft, D-2 10,000, D-3 5,000, D-4 4,000, D-5 3,500 (Table 1.03.101); legacy R-3 6,000 and R-4 5,000 (Title 2). A lot of record below the table minimum may still hold a single-family dwelling (Ch. 3, Art. I, Sec. 5.D). |
Permit Process & Fees [9][10][11][12]
An ADU permit in Birmingham goes through a standard permit review. Typical timeline: Residential plan review target is 3 working days or less (PEP Commercial and Residential Building Permitting Process, Jan. 2025); a rezoning through ZAC and Council takes months and is not guaranteed. Permit fees: Building permit $9.50 per $1,000 of valuation, $125 minimum, plus a $150 Certificate of Occupancy (2024 Technical Code, Art. V); trades covered under the general contractor pay a processing fee only. A $120,000 ADU is about $1,140 plus the CO.
| Approval Process | Building permit from the Dept. of Planning, Engineering & Permits (City Hall Room 210, 205-254-2904) through the Online Permit Center. Counter staff first check zoning (district, historic or design district, floodplain), then the plans (2 sets for single-family work) route to the Permits Division, Planning Division and Fire Department. In an eligible district an accessory dwelling is a permitted accessory use with no ZAC or Board hearing; in D-1, D-2 or D-3 the only route is a rezoning to D-4 through the Zoning Advisory Committee and City Council. |
| Review Timeline | Residential plan review target is 3 working days or less (PEP Commercial and Residential Building Permitting Process, Jan. 2025); a rezoning through ZAC and Council takes months and is not guaranteed. |
| Permit Fees | Building permit $9.50 per $1,000 of valuation, $125 minimum, plus a $150 Certificate of Occupancy (2024 Technical Code, Art. V); trades covered under the general contractor pay a processing fee only. A $120,000 ADU is about $1,140 plus the CO. |
| Impact Fees | No development impact fee appears in the 2024 Technical Code fee schedule (Art. V); only permit, plan-review, inspection and certificate fees are listed. Water and sewer connection charges from Birmingham Water Works and Jefferson County are separate; confirm before budgeting. |
| Plan Check | Reviewed by the Permits Division under the 2024 Technical Code (2021 IRC/IBC, IPC, IFGC, IMC, IECC and 2020 NEC), by the Planning Division for zoning and by the Fire Department. The commercial plan-review fee table ($150-$700 plus $1.50 per $1,000 over $100,000) does not apply to single-family work. |
| Pre-Approved Plans | None: Birmingham has no pre-approved ADU plan program. |
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Construction Costs [13]
Building an ADU in Birmingham typically costs $90,000-$180,000 ($120-$200 per sq ft); a garage conversion runs $40,000-$95,000.
See what this means for your lot — ask Birmingham ADU builders for a quote →
| Average Build Cost | $90,000-$180,000 |
| Cost per Sq Ft | $120-$200 |
| Garage Conversion | $40,000-$95,000 |
| Prefab ADU (Installed) | $70,000-$150,000 |
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Rental Income Potential [14][15][16][17][18][19]
A 2-bedroom ADU in Birmingham rents for around $1,100-$1,400/mo, an estimated Not meaningful in D-1-D-3 (no by-right unit). In an eligible district, HUD's FY2027 fair market rent for a 1-bedroom in the Birmingham-Hoover metro is $1,263 (Oct.
| Avg Rent (1 Bedroom) | $1,000-$1,300/mo |
| Avg Rent (2 Bedroom) | $1,100-$1,400/mo |
| Short-Term Rental | No short-term-rental ordinance is in force. |
| Est. Annual ROI | Not meaningful in D-1-D-3 (no by-right unit). In an eligible district, HUD's FY2027 fair market rent for a 1-bedroom in the Birmingham-Hoover metro is $1,263 (Oct. |
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Recent Law Changes
What's Changed Recently
- September 20, 2026: re-verified against the City of Birmingham Zoning Ordinance July 2026 Edition (posted July 14, 2026), all 2026 Zoning Advisory Committee agendas and minutes (Feb. 3 to Aug. 4) and City Council agendas July 14 to Sept. 22: no ADU text amendment filed; the only 2026 zoning-text change is the Floodplain Overlay amendment (ZAC2026-08008, Council hearing Sept. 1, 2026)
- July 14, 2026: City posted the July 2026 Edition of the Zoning Ordinance; it keeps 'Dwelling, Accessory' as a permitted accessory use in D-4, D-5, UN, MU-L/M/H/D, C-1 and C-2 with three conditions (Ch. 4, Art. IV, Sec. 2.B) and the 800 sq ft rear-yard allowance (Ch. 3, Art. I, Sec. 4.D.32); the amendment list ends at Ord. 24-81 (Oct. 15, 2024)
- June 9-30, 2026: six ADU listening sessions (Social Venture, Avondale, Central, North Birmingham, virtual, 5 Points West); the staff presentation stated 'No Ordinance or proposal has been drafted at this time' and that next steps are to summarize feedback and evaluate policy options, with no dates
- May 11, 2026: City announced the community conversation on a potential ADU ordinance, noting ADUs 'are not currently permitted in all residential districts'
- March 12, 2026: Council committee of the whole tabled the draft short-term rental ordinance for revisions; nothing adopted through September 2026
Tips for Building an ADU in Birmingham
- Find your district first: look up the parcel at gisweb.birminghamal.gov. D-4, D-5, UN, MU, C-1, C-2 (or legacy R-4, R-4A, R-5-R-7, B-1-B-4, O&I) means an accessory dwelling is a permitted accessory use today; D-1, D-2, D-3 (E-1, R-1, R-2, R-3) means it is not, and the ZAC application for a rezoning is the only route
- Keep a new backyard unit at 800 sq ft or less: that is the threshold at which Ch. 3, Art. I, Sec. 4.D.32 lets an accessory dwelling exceed the 30%-of-required-rear-yard cap, provided it meets 'design standards', a term the ordinance does not define elsewhere, so ask the Zoning Division (205-254-2478) what it will require
- Alley access counts: the unit needs access from an alley or an approved driveway, and a garage door opening onto an alley must sit 5 ft back from the alley line
- Two-family route in D-4/R-4: where an accessory dwelling is allowed, a duplex is usually allowed too (D-4 duplex at 2,000 sq ft of lot area per unit; legacy R-4 two-family at 3,000 sq ft per unit), which may suit an attached or basement second unit better than a detached one
- Existing garage apartments in historic neighborhoods: in a single-family district an occupied rear unit is a nonconforming use under Ch. 9, Art. VII; ask the Zoning Division for a zoning letter before renovating or listing it
- Budget the permit at $9.50 per $1,000 of valuation with a $125 minimum and a $150 Certificate of Occupancy; the city values work at the higher of your contract or the ICC valuation table
- Cost basis: the cost ranges are national industry-guide figures (BuildingAnADU, Portland data 2016-2019) scaled 20-30% lower for Alabama labor and materials; no Birmingham-specific 2026 builder survey exists, so get three local bids
- Watch for the draft: the Planning Division promised updates to town-hall sign-ins and www.birminghamal.gov/adu; any citywide ordinance would first appear as a ZAC text-amendment case (agendas at the Zoning Advisory Committee page) before a Council public hearing
- Cost basis (2026-09-20 re-verification): short term allowed: No short-term-rental ordinance is in force. The July 2026 Zoning Ordinance has no STR use; the only transient use in dwelling districts is a Bed and Breakfast Inn (not permitted in D-1-D-5 except a Historic B&B by special exception). A draft STR ordinance (permit plus business license, owner within 10 miles, citywide cap of 1,000) was tabled by the Council committee of the whole on March 12, 2026, and a 2024 ZAC proposal to make STRs a special exception in D-1-D-4 was never adopted. City lodging tax applies; confirm the rate with the Tax and License Division. | roi estimate: Not meaningful in D-1-D-3 (no by-right unit). In an eligible district, HUD's FY2027 fair market rent for a 1-bedroom in the Birmingham-Hoover metro is $1,263 (Oct. 1, 2026) against an industry-estimated $90,000-$180,000 build, roughly 7-12% gross before vacancy, tax and upkeep.
ADU Builders in Birmingham
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Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- City of Birmingham Zoning Ordinance, July 2026 Edition (Title 1: Ch. 1, Art. I, Sec. 9; Ch. 1, Art. III, def. 82; Ch. 2, Table 1.02.201; Ch. 3, Art. I, Sec. 4.D, Sec. 6, Sec. 7, Table 1.03.101; Ch. 4, Art. I, Sec. 1.D; Ch. 4, Art. IV, Sec. 2.B; Ch. 5, Table 1.05.101; Title 2, Ch. 1, Art. I, Sec. 1-5) Municipal Code — Accessed 2026-09-20
- City of Birmingham Zoning Ordinance page (links the July 2026 Edition) city_website — Accessed 2026-09-20
- Accessory Dwelling Units, City of Birmingham (ADU project page, unchanged since June 2026) city_website — Accessed 2026-09-20
- ADU Townhall Presentation, Planning Division, June 2026 ('No Ordinance or proposal has been drafted at this time') city_website — Accessed 2026-09-20
- The City of Birmingham launches community conversation on Accessory Dwelling Units (news release, May 11, 2026) city_website — Accessed 2026-09-20
- Zoning Advisory Committee: 2026 agendas and minutes (Feb. 3, Mar. 17, Apr. 21, June 2, July 7, Aug. 4; no ADU item) city_website — Accessed 2026-09-20
- Birmingham City Council meeting agenda, September 1, 2026 (Item 1: Floodplain Overlay zoning text amendment, ZAC2026-08008; no ADU or STR item July 14-Sept. 22) city_website — Accessed 2026-09-20
- Birmingham begins public input meetings on Accessory Dwelling Units (WBRC, June 10, 2026) news_media — Accessed 2026-09-20
- City of Birmingham Technical Code, 2024 Edition (Art. I adopted codes; Art. V Permit and Inspection Fees: $9.50 per $1,000, $125 minimum, CO $150) Municipal Code — Accessed 2026-09-20
- Article V Permit and Inspection Fees, Dept. of Planning, Engineering & Permits (fee sheet, Dec. 2024) city_website — Accessed 2026-09-20
- Commercial and Residential Building Permitting Process, Dept. of Planning, Engineering & Permits (review period 3 working days for single-family; 2 sets of plans) city_website — Accessed 2026-09-20
- City of Birmingham Permitting (Online Permit Center, Room 210, 205-254-2904) city_website — Accessed 2026-09-20
- Calculating the Costs of Accessory Dwelling Units, BuildingAnADU (Portland baseline 2016-2019: detached $112K-$285K, $162-$682/sq ft; garage conversion $80K-$150K; Alabama scaled 20-30% lower) industry — Accessed 2026-09-20
- HUD FY2027 Fair Market Rent Schedule, Birmingham-Hoover, AL HMFA (effective Oct. 1, 2026: 0BR $1,177, 1BR $1,263, 2BR $1,375, 3BR $1,727) Government Data — Accessed 2026-09-20
- HUD FY2027 Small Area FMR Schedule, Birmingham-Hoover ZIPs (city ZIPs 1BR $850 at 35204 to $1,720 at 35233; most neighborhoods $940-$1,340) Government Data — Accessed 2026-09-20
- Average Rent in Birmingham, AL, RentCafe (data as of August 31, 2026: 1BR $1,262, 2BR $1,385) Market Data — Accessed 2026-09-20
- Birmingham, AL Rent Research, Zumper (updated September 20, 2026: median 1BR $1,031, 2BR $1,083) Market Data — Accessed 2026-09-20
- Zoning Ordinance Changes: proposed short-term rental amendments, ZAC staff report, September 17, 2024 (never adopted) city_website — Accessed 2026-09-20
- Birmingham committee tables short-term rental ordinances (WBRC, March 13, 2026) news_media — Accessed 2026-09-20
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