ADU Rules in Prairieville, Louisiana

Prairieville is an unincorporated community in Ascension Parish south of Baton Rouge with a population of about 31,000. One of Louisiana's fastest-growing communities, Prairieville has been developed as a suburban alternative to Baton Rouge with newer residential subdivisions. There is no City of Prairieville — all zoning and permits are handled by Ascension Parish. Louisiana has no statewide ADU preemption law — Ascension Parish governs.

Important: Prairieville is Governed by Ascension Parish

There is no Prairieville city government. All ADU permits and zoning questions go through Ascension Parish — not a city.

Ascension Parish UDC

The Ascension Parish Unified Development Code governs all land use in unincorporated Ascension Parish, including Prairieville.

Permitted ADU Types

Depending on the Ascension Parish zoning district:

• Accessory apartments: Within or attached to primary structure
• Detached ADUs: Subject to parish zoning standards

Verify current ADU provisions with the Ascension Parish Planning Department.

Size Limits

Per Ascension Parish UDC:

• ADU size limits apply per zone — verify current standards

Setbacks

Per Ascension Parish residential zone:

• Rear: Minimum setback
• Side: Minimum setback

Flood Zones

Prairieville is in the coastal plain of Louisiana between Baton Rouge and the Gulf. Parts of Ascension Parish were severely impacted by the 2016 flood. Verify:

• FEMA flood map status for your property
• Post-2016 advisory flood elevations
• Substantial Improvement Rule compliance

HOA Considerations

Prairieville's newer subdivisions commonly have active HOAs. Consult your HOA before applying for permits.

Permit Process

1. Verify flood zone status: Post-2016 flood maps are critical
2. Check HOA restrictions: If applicable
3. Contact Ascension Parish Planning: NOT a Prairieville city office
4. Submit plans: Ascension Parish Building Inspection
5. Building permit and inspections
6. CO: Required before occupancy

Contact

Ascension Parish Planning Department 615 East Worthey Street, Gonzales, LA 70737 Phone: (225) 621-5490 Website: ascensionparish.net

Disclaimer: Louisiana has no statewide ADU law. Prairieville has no city government — use Ascension Parish for all permits. 2016 flood affected many properties — verify flood status. Verify current ADU allowances before starting any project.