St. James Parish, Louisiana requires a permit before a new home or other new building is constructed, and permits also cover residential renovations and additions1. The parish administers land-use zoning, while individual sewerage systems require state health approval23. Start with the parish Planning & Permitting Office for building, zoning and floodplain questions, then contact the St. James Parish Health Unit if the parcel needs onsite sewage disposal45.
At a glance
- Building permit
- Required for new homes, new buildings, mobile-home moves, residential renovations and additions1
- Zoning
- Yes; the parish administers a Land Use Ordinance2
- Septic permit
- Required through Louisiana's state health program36
- Owner-builder
- A licensing exemption is available for a qualifying personal residence, but an affidavit and permit are still required7
- RV or tiny-home living
- Private-land occupancy rules are not confirmed; ask Planning & Permitting before purchase or placement24
- Residential setbacks
- New-home permit guidance lists 20 ft front, 15 ft rear, and 5 ft and 10 ft side setbacks8
- Private well
- Use a licensed well driller; domestic wells follow state post-installation notification rules9
- Conventional septic soils
- 0% of mapped soils avoid severe drain-field limitations10
Who to call
Building permits
St. James Parish Planning & Permitting Office
Building permits, land-use applications, code enforcement, development information and permit-fee questions
5800 Highway 44, 3rd Floor of the Courthouse, Convent, LA 70723
Floodplain permits
St. James Parish Coastal Zone and Floodplain Management
Floodplain management, flood-map questions and property flood-history inquiries
5800 Highway 44, 3rd Floor of the Courthouse, Convent, LA 70723
Septic permits
Louisiana Department of Health — St. James Parish Health Unit
Local contact for Louisiana's onsite wastewater permitting and health-unit sanitation services
29170 Health Unit Street, Vacherie, LA 70090
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in St. James Parish, Louisiana?
Yes. St. James Parish requires a permit before construction of a new home or other new building, before moving a new mobile home within the parish, and for residential renovations or additions1. Commercial construction and renovation also require a permit, with construction drawings, State Fire Marshal approval and the necessary applications required of commercial applicants1. Louisiana's State Uniform Construction Code governs regulated construction, and its residential standards apply to new construction, reconstruction, qualifying additions and extensive alterations11. Parish-covered buildings must be inspected for compliance with state building codes before a certificate of occupancy is issued12. A permit is still required when a qualifying homeowner uses Louisiana's owner-builder licensing exemption; that exemption removes the contractor-license requirement, not health or life-safety rules7.
Who issues building permits in St. James Parish, and how do you apply?
The St. James Parish Planning & Permitting Office issues construction permits and provides information on drainage, public utilities, development requirements and property elevations4. Call 225-562-2500 or email [email protected], and use the parish's linked online permitting service when you are ready to apply4. The office accepts permit questions at the courthouse in Convent, and the parish page also identifies a courthouse-annex pickup option for permit applications4. Ask the office for the current fee because its page directs fee questions to Planning & Permitting and says fees are due when plans are submitted4. For a qualifying owner-builder project, file the required exemption affidavit with the building-permit application; the homeowner generally may build no more than 1 personal residence per year under this licensing exemption7.
Does St. James Parish have zoning?
Yes. St. James Parish maintains a Property & Zoning function and administers a Land Use Ordinance, so a rural parcel should not be treated as unrestricted2. For new residential construction, parish permit guidance lists a 20-foot front setback, a 15-foot rear setback, and side setbacks of 5 feet and 10 feet; accessory construction and mobile-home placement have separate standards8. We could not confirm a parishwide minimum dwelling size, minimum lot size, lot-coverage cap or building-height limit, so ask Planning & Permitting for the standards tied to the parcel and proposed use4. Louisiana law allows parish zoning districts to regulate structure size, lot occupancy, open space, density and land use, while actual district rules come from the parish ordinance13.
How do septic permits work in St. James Parish?
Louisiana requires a state-health-officer permit before an individual sewerage system is installed, altered or operated, and approved plans are part of that process3. Start with the Louisiana Department of Health's St. James Parish Health Unit at 29170 Health Unit Street in Vacherie, phone 225.265.218156. A septic tank system may be used only where a community-type sewerage system is unavailable and the sanitary-code requirements are met14. Final approval requires verification that the installation complies with the code, either through an onsite inspection, an installer certification, or both15. USDA soil mapping rates 0% of parish soils as free of severe limitations for a conventional drain field, so arrange the health review before choosing a house site or assuming a conventional system will work10.
Can you live in an RV or tiny home on land in St. James Parish?
We could not confirm a parish rule that allows or prohibits long-term RV occupancy on private land in St. James Parish, and Louisiana's public-property camping rule does not answer the private-land question16. We also could not confirm a parish tiny-home occupancy rule or a parishwide minimum dwelling size, so ask Planning & Permitting to review the parcel's zoning and the proposed unit before purchase or placement24. Moving a new mobile home within St. James Parish does require a permit, but that permit trigger alone does not establish where residential occupancy is allowed1. Any occupied unit using an individual sewerage system still needs state health approval before that system is installed, altered or operated3.
How do you build a home in St. James Parish?
- Ask Planning & Permitting to confirm the parcel's zoning, residential setbacks, flood status, utilities and application requirements284.
- If the site will not connect to community sewer, contact the St. James Parish Health Unit and obtain state approval for the individual sewerage system53.
- Submit the residential building-permit application through the parish's online permitting service or Planning & Permitting Office before construction begins14.
- File an owner-builder affidavit if you qualify for the personal-residence contractor-licensing exemption7.
- If access will connect to a Louisiana state highway, obtain a signed and numbered LaDOTD access-connection permit before driveway construction17.
- Complete the required building inspection before the parish issues a certificate of occupancy, and complete the required onsite-sewage verification before final septic approval1215.
What should you check before buying land in St. James Parish?
Check zoning, setbacks, flood history, utility availability and legal road access before closing, using Planning & Permitting for parcel development questions and Floodplain Management for flood information418. Conventional septic feasibility deserves early attention because 0% of mapped parish soils avoid severe drain-field limitations, while the parish receives about 64.1 inches of precipitation per year1019. Louisiana requires new water wells to be installed by a licensed water-well contractor and registered within 30 days after completion, while domestic wells follow the state's post-installation notification track9. A driveway connecting to a state highway needs a LaDOTD access-connection permit before construction begins17. For budgeting context, the parish's effective property-tax rate is about 0.5%, the median annual property-tax bill is about $1,043, and the typical annual home-insurance premium is about $2,879202122.
Watch-outs
- A Louisiana owner-builder exemption waives contractor licensing for a qualifying personal residence, but it does not waive the St. James Parish building permit or health and life-safety requirements71.
- USDA mapping rates 0% of St. James Parish soils as free of severe limitations for a conventional drain field, so secure a site-specific wastewater review before relying on a conventional septic design10.
- St. James Parish's RV and tiny-home occupancy rules could not be confirmed; ask Planning & Permitting for a written parcel-specific answer before buying or placing a unit24.
Sources
- Planning & Permitting Office, quoted and re-checked
- St. James Parish - Property & Zoning (2026 county census)
- Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
- St. James Parish Planning & Permitting Office (stjamesla.com)
- Louisiana Department of Health — St. James Parish Health Unit (ldh.la.gov)
- LDH - St. James Parish Health Unit (2026 county census)
- R.S. 37:2157 Exemptions, quoted and re-checked
- Information on Elevation, quoted and re-checked
- Louisiana Administrative Code, Title 43, Part VI, §701 (Louisiana statewide rule), quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- RS 40:1730.28. Mandatory adoption of nationally recognized codes and standards as the state uniform construction code (Louisiana statewide rule), quoted and re-checked
- Floodplain Development Permits & Regulations, quoted and re-checked
- RS 33:4780.40 — Regulation authorized (Louisiana statewide rule), quoted and re-checked
- Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
- Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
- RS 14:107.6. Unauthorized camping on public property (Louisiana statewide rule), quoted and re-checked
- LaDOTD Access Connections Policy (Louisiana statewide rule), quoted and re-checked
- St. James Parish Coastal Zone and Floodplain Management (stjamesla.com)
- Annual precipitation: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Typical home insurance premium: Bolthole Index county data
Written September 27, 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.