Building permits, zoning and land rules in St. Martin Parish, Louisiana

Unincorporated St. Martin Parish requires building permits for new construction and repairs, plus electrical permits for electrical work; applications need plans, specifications or blueprints stating total square footage¹. The parish has adopted a Uniform Construction Code ordinance and uses a contracted provider for construction inspections². Residential renovation, addition and demolition fees are $3.50 per $1,000 of applicable valuation, with a $100 minimum; starting required work before obtaining the building permit and paying the fee doubles the charge¹. Louisiana’s owner-builder contractor-license exemption ordinarily allows 1 personal residence per year, measured from certificate-of-occupancy issuance, and requires an affidavit with the building permit application; building permits and health and life-safety requirements still apply⁸. Inside Breaux Bridge, apply to the mayor for a building permit for covered work exceeding $1,000¹². Arnaudville directs building-permit applications to the parish police jury office, with parish health-unit and permit-officer approvals¹³. Morgan City, mainly in St. Mary Parish but reaching into St. Martin Parish, directs building-permit applications to city Planning and Zoning¹⁴. Individual sewerage approval remains with state health officials and the parish health unit³.

The St. Martin Parish Building Permits Department, at 303 West Port Street, St. Martinville, handles new construction, repair and electrical permits; call (337) 394-9816². The Planning and Zoning Department handles zoning, subdivision review and property-standards enforcement at the same West Port Street location and phone number¹⁵. The state health officer controls onsite-wastewater permitting, with administration through Louisiana Department of Health Sanitarian Services and the parish health-unit system^4,6. The parish directs new or updated sewer-system matters to the Office of Public Health/Sewer Systems at 303 Port Street, St. Martinville, (337) 394-6134². The parish's published process directs applicants to obtain a new address through the 911 Center before following the building-permit, electrical-permit or sewer-permit steps; the page also links an online permit portal².

Unincorporated St. Martin Parish has zoning, and district standards govern land uses, lot sizes and setbacks^2,5. A parcel’s district is generally established by its nearest public road, extending 500 feet from the road centerline unless Appendix C says otherwise⁵. The Planning and Development director issues development permits only after approval of an application for a certificate of zoning compliance⁵. R-1 requires at least 20,000 square feet and a 30-foot front yard; R-2 requires 12,000 square feet and a 25-foot front yard; A-2 requires 1 acre and a 50-foot front yard^5,10,11. Breaux Bridge and St. Martinville set municipal zoning inside their city limits^16,17. Morgan City, mainly in St. Mary Parish but reaching into this parish, also has municipal zoning districts¹⁸. Individual sewerage approval remains with state health officials and the parish health unit³. We could not confirm a minimum dwelling size, height or lot-coverage standard; ask parish Planning and Zoning for the standards governing your proposed house¹⁵.

A state health officer permit is required before installing, altering or operating an individual sewerage system in St. Martin Parish⁴. Louisiana Department of Health Sanitarian Services administers onsite-wastewater regulation through the parish health-unit system^3,6. An individual system is allowed only when community sewer is unavailable or infeasible, its plans are approved, and soil, drainage, lot size and related site conditions show that it is unlikely to create a nuisance or public-health hazard³. The installer must notify the local parish health unit before installation, and for a lot in a formal subdivision a recorded plat or approved survey must be on file before the septic permit issues¹⁹. Start with the parish Office of Public Health/Sewer Systems for a new or updated system². Only about 2.9% of parish soils rate free of severe limits for a conventional drain field, so resolve system feasibility and likely design cost before relying on a parcel for a homesite²⁰.

St. Martin Parish’s R-4 Mobile Home Park Residential district allows travel trailer rental spaces, limited to one per lot²¹. R-4 minimum lot areas are 3,000 square feet for a travel trailer park and 5,000 square feet for a mobile home park, subject to Louisiana State Sanitary Code, Chapter 13²¹. R-4 requires a 20-foot front yard, at least 10 feet on the side, and a rear yard of 20% of lot depth, not required to exceed 25 feet²¹. These park provisions do not establish permission to live long-term in an RV on a private parcel elsewhere; we could not confirm that rule, so ask parish Planning and Zoning about the proposed use and district^15,21. We also could not confirm a distinct tiny-home or accessory-dwelling occupancy rule; ask Planning and Zoning how the proposed unit is classified¹⁵. Individual sewerage must separately qualify for state approval where community sewer is infeasible³.

1. Obtain the official property address from the St. Martin Parish 911 Center before applying for a building, electrical or sewer permit².
2. Ask Planning and Zoning to identify the parcel's district and applicable use and dimensional standards, and obtain zoning compliance approval before the development permit; discuss any proposed land division with the parish coordinator before submitting preliminary plans^2,5,15.
3. Determine whether community sewer is feasible; if not, take the individual-system plans and site details to the Office of Public Health/Sewer Systems for the state approval process^2,3,6.
4. Submit plans, specifications or blueprints showing total square footage to the Building Permits Department and pay the applicable fee before work begins^1,2.
5. Complete the parish's required construction inspections through its contracted third-party provider².
6. For a driveway connecting to a state highway, obtain a signed and numbered LaDOTD access permit before construction in the right-of-way⁹.

St. Martin Parish's soils are difficult for septic: only about 2.9% rate free of severe limits for a conventional drain field, so plan on a site evaluation and likely an alternative system²⁰. The parish is flat and wet: 100% of its land sits at 15% slope or less, and 66.2% is wooded, with 62 inches of annual precipitation²⁰. Check the flood zone and any regulatory floodway status for a specific parcel before you buy: new development in a floodway generally needs a no-rise certification showing 0 feet of modeled rise, or a floodway revision obtained before the permit issues²². The parish center is about 16 miles in straight-line distance from the nearest city of 100,000 or more people, with a population density around 69.2 people per square mile²⁰. Typical property tax runs about 0.4% of value, with a median bill near $610 a year²⁰.