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Hall County, GA Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

ADU rules in Hall County, GA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Units per lot: One ADU per principal dwelling
Size range: 300 to 1,000 sq ft
Bedroom cap: No more than two bedrooms
Construction type: Site-built only, no mobile/modular
Placement (detached): Rear or side yard only

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Georgia under recent ADU streamlining laws. The Hall County, GA rules below cover local size, height, and setback requirements.

Summary

Hall County allows one accessory dwelling unit (ADU) per principal home, capped between 300 and 1,000 square feet and never larger than the main house. The ADU must be site-built, not a mobile or modular structure, limited to two bedrooms, and placed in the rear or side yard when it isn't attached to the primary dwelling.

These county ordinances apply to unincorporated areas of Hall County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

7.8.3. Accessory Dwelling Unit (ADU)
A.Defined A small, self-contained dwelling unit located on the same lot as a principal residence.
B.Use Standards1.The design and size of the ADU must conform to all codes required for any new construction.2.The ADU must be a site-built structure. Mobile or modular structures may not be used as an ADU.3.Only one ADU may be created per principal dwelling unit.4.The ADU must be either:a.Detached in an accessory building; orb.Attached or within the principal dwelling unit but not accessible from the interior of said dwelling unit. Such ADU must have its own independent entrance.5.If not attached to the principal dwelling, the building containing the ADU must be located in the rear or side yard.6.No ADU may exceed 1,000 square feet in floor area nor be less than 300 square feet in floor area, excluding any related garage area or other ancillary storage. In addition to the above, no ADU may exceed the floor area of the principal dwelling nor have more than two bedrooms.7.The ADU must be constructed of materials similar in appearance to the primary residence.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 80).

Full Breakdown

Sec. " The use standards at Sec. B require the ADU to conform to all codes for new construction and be a site-built structure; mobile or modular units cannot serve as an ADU. Only one ADU may be created per principal dwelling unit, and it must either be detached in an accessory building, or attached to or within the principal dwelling without interior access, in which case it needs its own independent entrance. A detached ADU not attached to the main house must sit in the rear or side yard.

Floor area is capped between 300 and 1,000 square feet, excluding any garage or ancillary storage area, and the ADU can never exceed the floor area of the principal dwelling or contain more than two bedrooms; it must also be built of materials similar in appearance to the primary residence. The Sec. 1 Allowed Use Table lists ADUs as permitted (P) in the AG-1, AR-1, V-C, R-1-L, R-1, R-X and M-U districts, and not permitted in R-TF, R-MF, MHP, O-I, S-S, H-B, I-1 or I-2, so the unit is a by-right accessory use only in the county's agricultural, most residential, and mixed-use zones.

Violations & Fines

Building an ADU larger than 1,000 square feet, adding a second ADU on the same lot, or installing a mobile or modular structure as an ADU violates Sec. 7.8.3.B. Under Sec. 11.4.4, that is a misdemeanor punishable per Sec. 1.50.020 by a fine up to $1,000, up to six months in jail, or both, with each day of the ongoing violation counted as a separate offense, and the Building Official may deny occupancy until the unit conforms.

Frequently Asked Questions

How big can an accessory dwelling unit be in Hall County?

Between 300 and 1,000 square feet of floor area, not counting a garage or ancillary storage, under Sec. 7.8.3.B.6. The ADU also can't exceed the floor area of the principal dwelling or have more than two bedrooms.

Can I put a mobile home in the backyard as an ADU?

No. Sec. 7.8.3.B.2 requires the ADU to be a site-built structure; mobile or modular structures cannot be used as an accessory dwelling unit anywhere in unincorporated Hall County.

How many ADUs can one lot have in Hall County?

Only one. Sec. 7.8.3.B.3 limits a property to a single ADU per principal dwelling unit, whether it's detached or attached with its own independent entrance.

Sources & Official References

[1]Hall County Code of Ordinances (Municode)

Other rules in Hall County

Fence Regulations: Height LimitsSome Restrictions Shed & Carport RulesSome Restrictions Parking Rules: Loading ZonesSome Restrictions Parking Rules: EV ChargingLight Restrictions Parking Rules: Commercial & Oversized VehiclesSome Restrictions Fence Regulations: Fence Permit RequirementsFew Restrictions Fence Regulations: Material RestrictionsSome Restrictions

All Hall County rules

How Hall County compares: Easiest Cities to Build an ADU·Compare Hall County to another location·View the Georgia accessory structures overview

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