ADUs are allowed in Unincorporated St. TammanyTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Unincorporated St. Tammany, LA
Is your property eligible for an ADU?
# of Parcels
107,754
Zoning districts
68
Zoning Districts:
107,444 parcels · 68 districts
S-1
27%(28,767)
L-1
17%(18,233)
PUD
13%(14,446)
L-2
11%(11,885)
Other
32%(34,113)
ADU Rules
What can you build in Unincorporated St. Tammany, LA?
Unincorporated St. Tammany, LA 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
Interior / Attached ADU Size Limits
- –Maximum size of 1,000 sq ft of habitable floor area for an internal or attached ADU; applies to lots up to 1 acre or when lot size is unknown.
- –On lots over 1 acre, an internal or attached ADU may be up to 7.5% of lot area, capped at 2,500 sq ft of habitable floor area.
Detached ADU Size Limits
- –Maximum ADU size is 1,000 sq ft of habitable floor space; for lots over 1 acre, up to 7.5% of lot area but not more than 2,500 sq ft.
Owner Occupancy
- –Owner occupancy not required for ADUs.
Parking
- –2 spaces per dwelling unit (no ADU-specific rate); off-street parking must be on the same lot; on-street parking cannot be counted; ADU defined as a dwelling unit; no waivers or exemptions for ADUs.
Rental Restrictions
- –Short-term rentals (<30 days) require an annual STR permit and adherence to operational standards; long-term rentals (30+ days) not prohibited.
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.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs
Is your property eligible for an ADU?
ADU rules in other Louisiana municipalities
Rules change at the town line. Check the municipality your property is actually in.
St. Tammany County