Atlanta, GA Accessory Structures: Tiny Homes (2026)
Tiny home rules in Atlanta, GA, covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds, determine where they are legal and how they get permitted.
Key Facts
- Allowed Districts
- R-4, R-4A, R-5 (detached ADU only)
- Max Size
- 750 sq ft
- Max Height
- 20 ft
- GA Tiny House Code
- Appendix S (permanent foundation, 400 sq ft or less)
- Min Habitable Room
- 70 sq ft (Appendix S)
- Tiny Houses on Wheels
- Not permitted as dwellings
- Statewide Preemption
- None (HB 1166 pending; HB 555 unrelated)
Summary
Atlanta allows tiny homes only as detached accessory dwelling units up to 750 sq ft and 20 ft tall in R-4, R-4A, and R-5 zones, built on a permanent foundation under Georgia's Appendix S tiny-house code. Movable tiny houses on wheels (THOWs) are not permitted as dwellings, and no statewide preemption law has been enacted.
What would the proposed ordinance do? The ADU proposal would expand the types and designs of ADUs that can be constructed in the city and the areas where they can be built. The proposal includes a variety of clean-ups and improvements on the 2018 ADU ordinance that was part of the Zoning Quick Fix effort. The changes include tweaks to the size and setback restrictions on ADUs, the ability to attach the ADU to the primary dwelling, and the zoning districts where ADUs can be constructed. The ordinance: Allows ADUs to be attached to the main dwelling like a basement apartment or garage conversion (maximum size: 50% of main or 1000 square feet) Increases detached ADU height from 20 ft to 24ft to allow second floor and over garage Adds ADU allowance to the R4B district (1 ADU max) Changes ADU rear and side setback in R4, R4A, R4B to 4ft (already allowed in R5) Increases detached ADU size allowance from 750 sqft to 1000 sqft. Allows for the sale of ADUs through detached zero-lot-line configuration currently used for duplexes in R5. This would not be a formal subdivision . This process allows for separate ownership of the units but maintains the existing development controls on the whole lot. Updates for-sale ADU language to claidy that only 1 zero-lot-line is allowed per lot Allows 3 total units in R5: i.e. duplex + ADU or 1 family unit + 2 ADUs Updates code to include ADUs in total floor area ratio calculation Only count conditioned space toward ADU square footage allowance (currently, garage space counts against the unit sqaure footage allowance for ADU which limits the ability to build a unit-over-garage style of ADU)
Full Breakdown
Atlanta does not have a separate "tiny house" zoning category. Under Part 16 of the Atlanta Code of Ordinances, a tiny home on a permanent foundation can be built only as a detached accessory dwelling unit in R-4, R-4A, or R-5 districts (and select SPI/historic overlays), subject to the ADU rules: maximum 750 sq ft, maximum 20 ft height, side and rear setbacks of 7 ft and 15 ft in R-4/R-4A and 4 ft and 4 ft in R-5, lot coverage capped at 50% (R-4/R-4A) or 55% (R-5), and only on lots already containing a primary single-family dwelling.
Construction is reviewed under the Georgia State Minimum Standard One and Two Family Dwelling Code (2018 IRC with Georgia amendments), and Georgia adopted Appendix S in November 2017, which authorizes tiny houses on permanent foundations of 400 sq ft or less and reduces the minimum habitable room size from 120 to 70 sq ft. Tiny houses on wheels (RVs/THOWs) are not recognized as permanent dwellings and cannot be lived in full-time on a residential lot under Atlanta zoning. Pending Georgia legislation (HB 1166 in the 2025-2026 session) would preempt local rules to allow ADUs of 400 sq ft or less by-right, but as of the 2025 session it has not been enacted; HB 555 ("Georgians First Residential Property Protection Act") addresses institutional residential investors, not ADU preemption.
A pending Atlanta DCP amendment would also raise the detached ADU height to 24 ft and the size cap to 1,000 sq ft and add R-4B.
Violations & Fines
Living in a tiny house on wheels on a residential lot, exceeding the 750 sq ft ADU cap, building without a permit, or violating setback or lot coverage limits is enforceable by the Office of Zoning and the Office of Buildings under Chapter 8 of the Atlanta Code. Violations can lead to stop-work orders, removal orders, and daily fines until the structure is brought into compliance.
Frequently Asked Questions
Can I put a tiny home in my backyard in Atlanta?
Are tiny houses on wheels (THOWs) legal as residences in Atlanta?
Did Georgia HB 555 legalize tiny homes statewide?
What building code applies to a tiny house in Atlanta?
Sources & Official References
Other rules in Atlanta
Compare Atlanta to another location·View the Georgia accessory structures overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.