Huntsville does not allow ADUs: the current Zoning Ordinance (as of April 1, 2026) contains no accessory dwelling unit provisions, Section 73.5 flatly prohibits residential use of any building behind a main building, and Section 10.6.3 bans kitchens in detached accessory structures. A 2024 ADU legalization ordinance (File 2024-1506) cleared the Planning Commission but was pulled from the City Council agenda in June 2024 and has never been adopted. The only sanctioned option is an interior 'second kitchen' in-law suite inside the main dwelling — owner-occupied, family/guests only, no rent allowed.
Zoning & Size Requirements [1][2][3][4]
No — Huntsville does not allow ADUs under current zoning. Section 73.5 of the zoning ordinance prohibits residential use of any building behind a main building, and detached accessory structures may not contain kitchens. The only sanctioned option is an interior 'second kitchen' in-law suite — owner-occupied, family/guests only, no rent. A 2024 legalization ordinance stalled before a council vote.
| Allowed Zones | None — detached/backyard ADUs are prohibited citywide (Sec. 73.5: 'No building in the rear of a main building on the same lot may be used for residential purposes'); interior second-kitchen suites allowed within the dwelling in Residence 1, 1-A, 1-B and 1-C districts (Sec. 10.6.11) |
| Max Size (Detached) | N/A — detached ADUs prohibited (Sec. 73.5; Sec. 10.6.3 bans kitchens in detached accessory structures) |
| Max Size (Attached) | No size cap for an interior second-kitchen suite, but it must share an interior wall with and be directly accessible from the main living areas (Sec. 10.6.2) — no separation by garage, breezeway or porch |
| Max Size (JADU) | N/A — no JADU category |
| Max Height | N/A for ADUs; accessory structures follow district standards |
| Max Units | 0 independent ADUs; 1 second kitchen inside the dwelling, no separate meters, mailbox or address (Secs. 10.6.6, 10.6.8) |
Setback Requirements [1][2][3][4]
Huntsville requires a rear setback of about the required distance for a detached ADU, and parking requirements vary by unit size or location. Owner-occupancy is required.
| Rear Setback | N/A for ADUs — rear dwellings prohibited |
| Side Setback | N/A for ADUs |
| Front Setback | N/A for ADUs |
| Parking Required | N/A — no ADU standard exists |
| Owner Occupancy | Required for second-kitchen suites: owner must occupy the dwelling; users limited to family members or temporary guests; no rent may be collected (Sec. 10.6.5) |
| Min Lot Size | N/A for ADUs |
Permit Process & Fees [5]
An ADU permit in Huntsville typically costs Confirm with Huntsville Development Services and takes N/A for ADUs; confirm second-kitchen and building-permit timelines with Huntsville Planning & Zoning Services, through a standard permit review.
| Approval Process | No ADU permit exists. Second-kitchen installations require zoning compliance (no variance) and are recorded by the Zoning Administrator (Sec. 10.6.10); building permits go through the City of Huntsville Development Services/Planning |
| Review Timeline | N/A for ADUs; confirm second-kitchen and building-permit timelines with Huntsville Planning & Zoning Services |
| Permit Fees | Confirm with Huntsville Development Services |
| Impact Fees | None identified; confirm with Huntsville Development Services |
| Plan Check | Standard residential plan review; confirm with Huntsville Development Services |
| Pre-Approved Plans | None |
Get Free ADU Quotes in Huntsville
Tell us about your project and we'll connect you with ADU builders serving Huntsville. Free, no obligation — you choose who to work with.
Takes about a minute.
Up to 3 independent local ADU builders — never more, and we tell them nothing you don't submit here.
Compare quotes, verify license & insurance, hire (or don't). No spam either way.
🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.
Construction Costs [6]
Building an ADU in Huntsville typically costs $95,000-$185,000 ($125-$200 per sq ft); a garage conversion runs $40,000-$95,000.
See what this means for your lot — get 3 free quotes from Huntsville ADU builders →
| 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 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Rental Income Potential [7]
A 2-bedroom ADU in Huntsville rents for around $1,150-$1,400/mo, an estimated 5-8% annual return (hypothetical — ADUs currently prohibited).
| Avg Rent (1 Bedroom) | $1,000-$1,200/mo |
| Avg Rent (2 Bedroom) | $1,150-$1,400/mo |
| Short-Term Rental | Moot — ADUs are not legal, and a dwelling with a second kitchen cannot be used as rental property at all (Sec. 10.6.9) |
| Est. Annual ROI | 5-8% annual return (hypothetical — ADUs currently prohibited) |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Recent Law Changes
What's Changed Recently
- June 2024: Planning Commission approved a zoning amendment (File 2024-1506) to define and permit ADUs by amending Secs. 3.1, 73.1 and 73.5
- June 13, 2024: The ADU ordinance was pulled from the City Council agenda for 'further review' hours before the meeting and was never brought back for a vote
- April 1, 2026 ordinance codification confirms no ADU provisions were ever added — Sec. 73.5 'Rear Dwelling Prohibited' remains in force
- June 2026: Advocacy group Advance Huntsville is still campaigning for legalization; council remains split amid resident opposition
Tips for Building an ADU in Huntsville
- Do not build a backyard cottage or garage apartment in Huntsville — rear residential buildings are prohibited and detached structures cannot contain kitchens
- For multigenerational living, use the Sec. 10.6 second-kitchen pathway: an in-law suite inside the main house, owner-occupied, family/guests only, no rent
- If you install a second kitchen and later sell or rent the home, the kitchen facilities must be disclosed or removed (Sec. 10.6.9) — plan for that
- Watch the City Council agenda: the shelved 2024 ADU ordinance could return; Advance Huntsville tracks the status if you want to advocate
ADU Builders in Huntsville
Looking for an ADU builder in Huntsville? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Huntsville homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
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 (as of April 1, 2026), Secs. 10.6 & 73.5 Municipal Code — Accessed 2026-07-10
- Zoning Ordinance — City of Huntsville city_website — Accessed 2026-07-10
- Huntsville Legistar File #2024-1506 (ADU zoning amendment) city_website — Accessed 2026-07-10
- Help us legalize ADUs! — Advance Huntsville (status as of June 2026) news_media — Accessed 2026-07-10
- City of Huntsville Zoning Ordinance (as of April 1, 2026), Sec. 10.6 Municipal Code — Accessed 2026-07-10
- Calculating the Costs of Accessory Dwelling Units — BuildingAnADU (national baseline; AL runs 20-30% below) news_media — Accessed 2026-07-10
- Average Rent in Huntsville, AL — RentCafe (July 2026) news_media — Accessed 2026-07-10
Frequently Asked Questions
Can I build an ADU in Huntsville?
How much does an ADU cost in Huntsville?
How much can I rent an ADU for in Huntsville?
Do I need parking for an ADU in Huntsville?
How long does it take to get an ADU permit in Huntsville?
Ready to Build in Huntsville?
Get free, no-obligation quotes from top-rated ADU contractors in Huntsville.
Get Free Quotes →