ADUs are allowed in FranklinTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Franklin, TN
Is your property eligible for an ADU?
# of Parcels
31,639
Zoning districts
25
Avg Parcel Value
$1,225,474
Zoning Districts:
31,617 parcels · 25 districts
PD
68%(21,563)
R3
8%(2,481)
R2
8%(2,381)
R4
6%(1,968)
Other
10%(3,224)
ADU Rules
What can you build in Franklin, TN?
Franklin, TN follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Detached ADU Size Limits
- –Maximum detached ADU footprint is 50% of the principal building’s footprint.
Owner Occupancy
- –Owner must occupy the lot as a permanent occupant.
Parking
- –1 space/ADU; max not stated; on-site or in-garage parking allowed; no reductions in CFO/CAO overlays; on-street parallel spaces generally cannot count; per Section 10.3, pervious-surface requirement applies above 120% of minimum and not for single-family lots.
Rental Restrictions
- –One short-term rental per lot; owner must be a permanent occupant. If both a dwelling and an ADU exist, the owner may live in one and rent the other short-term; the 113-night cap applies only to lots without an ADU.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other Tennessee municipalities
Rules change at the town line. Check the municipality your property is actually in.
Williamson County