Building permits, zoning and septic rules in Jefferson Parish, Louisiana

At a glance

Building permit

Required for regulated construction, alterations, repairs, demolition and occupancy changes¹

Zoning

Parish zoning applies in unincorporated areas; municipalities handle their own zoning³

Septic permits

Issued by the state (Louisiana Dept. of Health) through the Jefferson Parish Health Unit, not the parish⁴

Owner-builder exemption

Available for a personal residence with an Affidavit Claiming Exemption from Licensure⁵

Accessory dwelling

Conditional zoning amendment and building permit required; size and placement limits apply⁶

Manufactured home

Allowed only conditionally in the RR-3 district under the cited rule⁷

Driveway permit

Required for a new, replacement or added apron on parish right-of-way⁸

RV living

We could not confirm a general private-land occupancy rule; ask Planning about the parcel⁹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 7, 2026.

Do you need a building permit in Jefferson Parish, Louisiana?

Yes. Unincorporated Jefferson Parish requires all required permits to be in hand before regulated construction, alteration, repair, movement, demolition or a change of occupancy begins¹. Electrical, gas, mechanical and plumbing work covered by the technical codes requires a properly licensed applicant and an inspection filing before work starts¹⁰¹¹. Minor work and ordinary repairs may usually be exempt, but the code official may still require a permit and inspection when a condition is hazardous or complex¹. Residential permit plans must identify the applicable reference code and comply with Jefferson Parish's adopted code amendments¹². An owner applying for a building permit on a personal residence may claim a licensing exemption by filing the parish affidavit; this does not remove building-permit or inspection requirements⁵¹¹.

Who is the Jefferson Parish building department, and how do you reach them?

The Jefferson Parish Building Permits Department is the building department for unincorporated Jefferson Parish². Its East Bank office is at 1221 Elmwood Park Boulevard, Suite 101, Jefferson, and its West Bank office is at 1855 Ames Boulevard, Suite A, Marrero². Call the East Bank office at 504-736-6957 for residential or commercial building-permit questions². Permit Navigators serve as applicant contacts and follow building permits through review². Engineering automatically reviews every building permit filed for a new single-family dwelling, two-family dwelling, townhouse, manufactured home or modular home; applicants no longer submit the former Public Works infrastructure-assurance form¹³. Required inspections still apply to permitted technical-code work, although qualifying reroofing work may use geotagged photographs instead of an in-person inspection¹¹. A new building cannot be occupied, and an existing building's use or occupancy cannot change, until the Building Permits Director issues a Certificate of Use or Occupancy, subject to the ordinance's exception¹⁴.

Does Jefferson Parish have zoning?

Yes, in unincorporated Jefferson Parish. Parish zoning regulates land use, building size and placement, yards and parking by district; Kenner, Gretna, Harahan, Westwego, Lafitte and Grand Isle are outside the parish zoning map and their own jurisdictions answer zoning questions⁹¹⁵³. Ask the Planning Department at 504-736-6320 to confirm the current district and standards for a parcel¹⁶. Rules vary sharply by district and study area. For certain R-1A, R-1B and S-1 properties in the Leo Kerner/Lafitte Parkway study area, interim setbacks are 50 feet in front, 25 feet in back and 15 feet on each side¹⁷. Those standards were adopted for one year beginning October 22, 2025 and may be extended once for six months, so confirm their current status before relying on them¹⁷.

How do septic permits work in Jefferson Parish?

Septic permitting in Jefferson Parish is handled by the Louisiana Department of Health through the parish health unit, not by the parish building department⁴. Louisiana requires a state health officer's permit before an individual sewerage system is installed, altered or operated¹⁸. A septic tank system may be used only where a community sewer is unavailable, while a mechanical treatment plant requires a finding that a conventional system would not work properly¹⁹²⁰. Jefferson Parish has no mapped soil share rated without severe limits for a conventional drain field, so a site evaluation and a nonconventional design may be necessary²¹. Final approval requires either a state on-site inspection or a licensed installer's completed certification form²². Start with Environmental Health Services at the Jefferson Parish Health Unit before designing the house or buying septic equipment²³.

Can you live in an RV or tiny home on your land in Jefferson Parish?

Jefferson Parish's general rule for living in an RV or a stand-alone tiny home on private land could not be confirmed, so ask the Planning Department about an unincorporated parcel or the relevant municipality about land inside its limits³¹⁶. A mobile or manufactured home is conditionally allowed under the cited RR-3 rule only when the applicable criteria are met and approval is obtained; that rule is not parishwide permission⁷. An accessory dwelling unit has a clearer path: it requires a conditional zoning map amendment and building permit, must serve a qualifying primary residence, and cannot be an RV, travel trailer or mobile home⁶. Only one accessory dwelling is allowed per lot; it must be at least 400 square feet and no larger than half the principal building or 1,000 square feet, whichever cap applies⁶²⁴. The underlying district's side-yard setback applies along the accessory dwelling's rear and side yards, and the unit cannot occupy the required front yard²⁵.

Building a home in Jefferson Parish: the steps, in order

1. Confirm the zoning authority, district and current dimensional standards with the Jefferson Parish Planning Department or the municipality where the lot lies³¹⁶.
2. Ask whether public water and sewer serve the lot; a new parish utility connection requires an application, review, fees and sometimes more documents²⁶.
3. If sewer is unavailable, contact the Jefferson Parish Health Unit for the state septic permit and site evaluation²³¹⁸.
4. Ask Floodplain Management what elevation and floodplain requirements apply before finalizing plans²⁷²⁸.
5. Include a parish driveway-permit application with a new-home building permit when the apron meets parish right-of-way; a state-road connection instead needs a Louisiana Department of Transportation and Development driveway permit⁸.
6. File the building-permit application and, if building a personal residence as an owner-builder, the licensing-exemption affidavit with the Building Permits Department before work begins¹⁵².
7. Complete the required building-system inspections, obtain septic final verification and secure the Certificate of Use or Occupancy before occupying the new building¹¹²²¹⁴.

What to check before you buy land in Jefferson Parish

Check zoning, legal-lot status, utilities, flood requirements and access before closing. The Jefferson Parish Planning Department reviews subdivision applications and makes recommendations, while a qualifying minor subdivision in unincorporated Jefferson Parish can use administrative approval only when it stays within 10 lots and 2 acres; a major subdivision requires public hearings²⁹³⁰. Planning fees vary by application, so schedule the recommended pre-application conference rather than budgeting from one fee alone³¹. Verify actual utility availability and connection costs; the published total for a residential three-quarter-inch meter is $1,130, including deposit, installation and sewerage charges²⁶. Floodplain rules can impose building-height requirements, and development in a regulatory floodway may need a no-rise demonstration²⁷³². A conventional drain field faces severe soil limitations throughout the mapped parish area²¹. Identify whether the driveway meets parish or state right-of-way because each has a separate driveway-permit path⁸.

Watch-outs

• The Jefferson Parish owner-builder affidavit concerns contractor licensing, not building permits or inspections; an eligible owner is still subject to parish review⁵¹¹.
• Jefferson Parish prohibits short-term rentals in single-use residential zoning districts; a permitted location also needs zoning clearance, licensing, inspection and a $750 yearly lodging-license processing fee³³³⁴.
• An accessory dwelling in a required rear yard is capped at 13 feet high, and the accessory dwelling plus other accessory structures may cover no more than 60 percent of that rear yard, excluding pools³⁵³⁶.
• A new, replacement or additional driveway apron on parish right-of-way needs a parish driveway permit, while a state-road connection needs a state driveway permit instead⁸.

Sources

1. When Do I Need / Not Need a Permit, quoted and re-checked
2. Jefferson Parish Building Permits Department (jeffparish.gov)
3. Ordinance Number 26625, quoted and re-checked
4. Louisiana Department of Health - Onsite Wastewater Program (2026 county census)
5. Requirements for Submittal of Residential Building Permit Application, quoted and re-checked
6. jeffparish.gov, quoted and re-checked
7. Ordinance Number 26490, quoted and re-checked
8. Residential Driveway Review, quoted and re-checked
9. Jefferson Parish Planning FAQs, quoted and re-checked
10. Building Permit Information FAQ, quoted and re-checked
11. When Do I Need / Not Need a Permit, quoted and re-checked
12. Requirements for Submittal of Residential Building Permit Application, quoted and re-checked
13. Requirements for Submittal of Residential Building Permit Application, quoted and re-checked
14. jeffparish.gov, quoted and re-checked
15. Jefferson Parish Planning FAQs, quoted and re-checked
16. Jefferson Parish Planning Department (jeffparish.gov)
17. jeffparish.gov, quoted and re-checked
18. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
19. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
20. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
21. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
22. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
23. Jefferson Parish Health Unit - Metairie (Louisiana Department of Health) (ldh.la.gov)
24. jeffparish.gov, quoted and re-checked
25. jeffparish.gov, quoted and re-checked
26. Apply for New Service, quoted and re-checked
27. jeffparish.gov, quoted and re-checked
28. Jefferson Parish Floodplain Management & Hazard Mitigation (jeffparish.gov)
29. Planning, quoted and re-checked
30. Subdivision FAQ, quoted and re-checked
31. Conditional Zoning Map Amendment Instructions and Fees, quoted and re-checked
32. State of Louisiana No Rise Certification Guidance (Louisiana statewide rule), quoted and re-checked
33. Hotel / Motel / Short Term Rental Permits and Licenses, quoted and re-checked
34. Requirements for Submittal of Residential Building Permit Application, quoted and re-checked
35. jeffparish.gov, quoted and re-checked
36. jeffparish.gov, quoted and re-checked

Written October 7, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.