Huntsville does not allow accessory dwelling units: the Zoning Ordinance updated to April 1, 2026 (still the live text on September 20, 2026) has no ADU use, Sec. 73.5 says no building in the rear of a main building may be used for residential purposes, and Sec. 10.6.3 bans kitchens in detached accessory structures. The 2024 legalization proposal (Council File 2024-1506) was deleted from the June 13, 2024 agenda and has not been re-filed; no ADU item appeared before the Planning Commission or City Council between September 2025 and September 2026. The only legal in-house option is a Sec. 10.6 second kitchen: an in-law suite inside the main dwelling, owner-occupied, for family or unpaid guests, in Residence 1, 1-A, 1-B and 1-C districts. A true second unit requires a two-family dwelling (duplex) on a Residence 2-type lot of at least 7,500 sq ft (Sec. 13.2.2). Building permits cost 0.55% of the contract price.
Zoning & Size Requirements [1][2][3][4][5]
No — Huntsville does not allow ADUs under current zoning. Sec. 73.5 of the Zoning Ordinance (updated to April 1, 2026, still the live text in September 2026) prohibits residential use of any building behind a main building; detached accessory structures may not contain a kitchen (Sec. 10.6.3) or plumbing beyond one laundry sink and/or one toilet (Sec. 3.1). The only sanctioned option is an interior second-kitchen in-law suite: owner-occupied, family or unpaid guests only, no rent (Sec. 10.6). The 2024 legalization file (2024-1506) was deleted from the City Council agenda on June 13, 2024 and nothing has been re-filed as of September 20, 2026.
| Allowed Zones | None. Sec. 73.5 ('No building in the rear of a main building on the same lot may be used for residential purposes') bars backyard and garage ADUs citywide, and the ordinance updated to April 1, 2026 lists no ADU use in any district. An interior second kitchen inside the main house is allowed in Residence 1, 1-A, 1-B and 1-C districts (Sec. 10.6.11); a genuine second unit needs a Residence 2, 2-A, 2-B or 2-C lot, where a two-family dwelling is a permitted principal use (Sec. 13.1). |
| Max Size (Detached) | N/A: a detached accessory structure cannot be a dwelling (Sec. 73.5), may hold no plumbing beyond one laundry sink and/or one toilet (Sec. 3.1 'Accessory Structure'; a pool bath house up to 180 sq ft is the only exception) and may not contain a kitchen (Sec. 10.6.3). Accessory structures may cover at most 30% of the required rear yard and rise no more than 2 stories (Sec. 73.8.1). |
| Max Size (Attached) | No size cap for an interior second-kitchen suite, but it must be inside the dwelling, share at least one interior wall with and be directly accessible from the living areas, and not be separated from them by a garage, breezeway, porch or other non-habitable space (Secs. 10.6.2-10.6.3). It is not a separate dwelling unit: no rent, no separate meters, no second mailbox or address (Secs. 10.6.5-10.6.9). |
| Max Size (JADU) | N/A: Huntsville has no JADU or ADU category. The only interior option is the Sec. 10.6 second kitchen, which stays part of the single-family dwelling. |
| Max Height | N/A for ADUs. Detached accessory structures are capped at 2 stories (Sec. 73.8.1); the Residence 1 district cap for any building is 2.5 stories / 35 ft (Secs. 10.2.8-10.2.9) and 2 stories / 30 ft for a two-family dwelling in Residence 2 (Sec. 13.2.2). |
| Max Units | 0 ADUs. One dwelling unit per single-family lot; a second kitchen does not create a second unit and may not show separate meters, two mailboxes or two addresses (Secs. 10.6.6, 10.6.8). Two units on one lot exist only as a two-family dwelling in Residence 2-type districts (Sec. 3.1 'Dwelling, Two Family'; Sec. 13.1). A dwelling with no more than 2 adult residents and no second kitchen may take in up to 3 non-transient roomers or boarders (Sec. 73.1.1(1)(c)). |
Setback Requirements [1][2][3][4][5]
Because Huntsville does not permit ADUs, there are no ADU-specific setback or parking standards; the accessory-structure rules below are what a future unit would start from. Owner-occupancy is required.
| Rear Setback | N/A for ADUs (rear dwellings prohibited, Sec. 73.5). A non-dwelling accessory structure must sit at least 5 ft from all lot lines and 10 ft from any other structure on the lot (Sec. 73.8.1). Main-building rear yard: 45 ft in Residence 1 (Sec. 10.2.5); 25 ft for a two-family dwelling in Residence 2 (Sec. 13.2.2). |
| Side Setback | N/A for ADUs. No accessory structure may be built in any required side yard (Sec. 73.8.1). Main-building side yards: 15 ft each in Residence 1 (Sec. 10.2.6); 5 ft (1 story) or 6 ft (2 stories), 14 ft combined, for a two-family dwelling in Residence 2 (Sec. 13.2.2). |
| Front Setback | N/A for ADUs. No accessory structure may be erected in any front yard (Sec. 73.8.1), and on corner lots it may be no closer to a street than the minimum building line (Sec. 73.8.2). Residence 1 front yard: 40 ft, or 50 ft on major arterials (Sec. 10.2.4); Residence 2 two-family: 20 ft / 50 ft (Sec. 13.2.2). |
| Parking Required | No ADU parking standard exists because no ADU use exists. Off-street parking for dwellings follows the district's parking section (e.g. Sec. 10.3) and Sec. 73.14; confirm the required count for a two-family dwelling with the Zoning Enforcement Office (256-564-8008). |
| Owner Occupancy | Required for a second kitchen: the owner must occupy the home as their legal residence, users must be family (related by blood, marriage or law) or temporary guests who keep a legal residence elsewhere, and no rent or other remuneration may be taken (Sec. 10.6.5). A home with two kitchens may not be used as rental property at all (Sec. 10.6.9). |
| Min Lot Size | N/A for ADUs. For context: minimum lot area is 15,000 sq ft in Residence 1 (Sec. 10.2.1), 12,000 in 1-A (Sec. 11.2.1), 7,500 in 1-B (Sec. 12.2.1) and 5,500 in 1-C (Sec. 16.2.1); a two-family dwelling in Residence 2 needs 7,500 sq ft and 60 ft of lot width (Sec. 13.2.2). |
Permit Process & Fees [6][7]
Huntsville cannot issue an ADU permit under current zoning. The fees and timelines below are the general building-permit terms that would apply if the rules change.
| Approval Process | No ADU permit exists. A second kitchen needs no variance but the property must comply with zoning (Sec. 10.6.1) and the Zoning Administrator keeps a record of it (Sec. 10.6.10). Building work is permitted by the Inspection Office (305 Fountain Circle, 256-427-5331; ePlans submittal), with plumbing, electrical, gas and mechanical permits pulled by the licensed trade contractors. |
| Review Timeline | Not published for residential additions or second-kitchen work; confirm with the Inspection Office (256-427-5331). Zoning questions go to the Zoning Enforcement Office, 256-564-8008. |
| Permit Fees | Building permit = total contracting price x 0.0055 (0.55%): about $330 on a $60,000 in-law-suite remodel, $825 on a $150,000 addition (City 'Permit Costs' page, read Sept 2026). Trade permits are billed separately. |
| Impact Fees | None identified: the City's Permit Costs page lists only the 0.55%-of-contract building permit and no development impact fee. Confirm any water or sewer tap charges with Huntsville Utilities and Water Pollution Control before adding fixtures. |
| Plan Check | Standard residential plan review through the Inspection Office's ePlans submittal; no ADU-specific review exists. Confirm requirements at 256-427-5331. |
| Pre-Approved Plans | None. The City has no pre-approved ADU plan program because ADUs are not a permitted use. |
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Construction Costs [8]
If ADUs become legal in Huntsville, building one would run roughly $95,000-$185,000 ($125-$200 per sq ft) at today's regional rates; a garage conversion about $40,000-$95,000.
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| Average Build Cost | $95,000-$185,000 |
| Cost per Sq Ft | $125-$200 |
| Garage Conversion | $40,000-$95,000 |
| Prefab ADU (Installed) | $70,000-$150,000 |
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Rental Income Potential [9][10][11][12]
A 2-bedroom unit in Huntsville would rent for around $1,100-$1,400/mo at current market rates — a hypothetical figure while ADUs are not permitted.
| Avg Rent (1 Bedroom) | $1,050-$1,150/mo |
| Avg Rent (2 Bedroom) | $1,100-$1,400/mo |
| Short-Term Rental | No. ADUs are not legal and a home with a second kitchen cannot be rented at all (Sec. 10.6.9). |
| Est. Annual ROI | N/A: ADUs are prohibited and a second kitchen may earn no rent (Sec. 10.6.9). For a lawful duplex on a Residence 2 lot, HUD FY2026 Fair Market Rent for the Huntsville MSA is $1,136 (1BR) and $1,310 (2BR). |
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Recent Law Changes
What's Changed Recently
- September 20, 2026: Re-verified. The Zoning Ordinance 'Updated to April 1, 2026' is still the live text linked from the City's Zoning Ordinance page (page updated April 9, 2026); Sec. 73.5 'Rear Dwelling Prohibited' and Sec. 10.6.3 (no kitchen in a detached structure) are unchanged, and the ordinance's amendment log ends at Ord. 26-157 (April 1, 2026, hemp-product rules) with no ADU amendment
- September 2025 to September 2026: No ADU or Article 73 text amendment appeared on any Planning Commission or Zoning Committee agenda or in Planning Commission minutes, and City Council Legistar shows no accessory-dwelling matter filed since File 2024-1506
- June 18, 2025: Ord. 25-267 amended the 'Family' definition (Sec. 3.1, up to four unrelated adults) and the roomer/boarder rules in Sec. 73.1.1 and added Article 78 (Community Homes); it contains no ADU provision
- June 13, 2024: File 2024-1506, a resolution to set a public hearing on an ordinance adding an ADU definition to Sec. 3.1 and ADU regulations to Secs. 73.1 and 73.5, was marked DELETED on the City Council agenda; the ordinance was never re-introduced
Tips for Building an ADU in Huntsville
- Do not build a backyard cottage or garage apartment: Sec. 73.5 bars residential use of any rear building, and a detached structure may hold no plumbing beyond one laundry sink and/or one toilet (Sec. 3.1) and no kitchen (Sec. 10.6.3)
- For multigenerational living use the Sec. 10.6 second-kitchen route: an in-law suite inside the main house that shares an interior wall, owner-occupied, family or temporary guests only, no rent, no separate meter, mailbox or address
- If you later sell or rent a home with a second kitchen you must tell the buyer, and the kitchen facilities must be removed before the home is rented (Sec. 10.6.9)
- Want a legal second unit? Only a two-family dwelling on a Residence 2, 2-A, 2-B or 2-C lot qualifies (7,500 sq ft, 60 ft wide, 2 stories / 30 ft, Sec. 13.2.2), and both units must be in the main building, not a rear structure
- Budget the building permit at 0.55% of the contract price (City Permit Costs page) plus contractor-pulled trade permits, and call the Zoning Enforcement Office (256-564-8008) before drawing plans
- Cost basis: the four cost figures are reference-only national ADU ranges (BuildingAnADU, Portland data through 2019, read 2026-09-20) scaled down 20-30% for north Alabama construction pricing; none of these projects can be permitted in Huntsville today
- Watch the City Council's Legistar and the Planning Commission agenda archive for any 'Accessory Dwelling Unit' text amendment; nothing has been filed since June 2024
- Cost basis (2026-09-20 re-verification): short term allowed: No. ADUs are not legal and a home with a second kitchen cannot be rented at all (Sec. 10.6.9). The City treats short-term rentals (stays of 179 days or less) as motels: not permitted in most residential districts, allowed by right only in Residence 2-B and listed commercial/industrial districts, and they require a City business license plus 9% lodging tax and a $2 per room-night surcharge (City Short Term Rentals page, 2026).
ADU Builders in Huntsville
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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 Huntsville Zoning Ordinance, Updated to April 1, 2026: Secs. 3.1 (definitions), 10.2, 10.6, 13.1-13.2.2, 73.1.1, 73.5, 73.8 and the amendment log (through Ord. 26-157) Municipal Code — Accessed 2026-09-20
- Zoning Ordinance page (Updated April 9, 2026) and Zoning Enforcement Office contact, City of Huntsville city_website — Accessed 2026-09-20
- Huntsville City Council Legistar: File 2024-1506 (ADU ordinance, DELETED June 13, 2024) and 2025-2026 legislation search (no ADU matter) city_website — Accessed 2026-09-20
- Planning Commission and Zoning Committee agendas and minutes archive, September 2025 to September 2026, City of Huntsville Planning Department — Accessed 2026-09-20
- ADUs in AL.com (July 8, 2024) and ADU tag posts, Advance Huntsville (advocacy group; legalization still being sought) news_media — Accessed 2026-09-20
- Permit Costs (building permit = contract price x 0.0055), Inspection Office, City of Huntsville fee_schedule — Accessed 2026-09-20
- City of Huntsville Zoning Ordinance, Updated to April 1, 2026, Sec. 10.6 Second Kitchens Municipal Code — Accessed 2026-09-20
- Calculating the Costs of Accessory Dwelling Units, BuildingAnADU (national/Portland baseline through 2019; Alabama scaled 20-30% lower) industry — Accessed 2026-09-20
- HUD FY2026 Fair Market Rents, Huntsville, AL MSA (1BR $1,136, 2BR $1,310) Government Data — Accessed 2026-09-20
- Average Rent in Huntsville, AL, RentCafe (data as of August 31, 2026: 1BR $1,128, 2BR $1,373) Market Data — Accessed 2026-09-20
- Huntsville, AL Rent Research, Zumper (updated September 20, 2026: 1BR $1,075, 2BR $1,109) Market Data — Accessed 2026-09-20
- Short Term Rentals: zoning districts, business license and 9% lodging tax, City of Huntsville city_website — Accessed 2026-09-20
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