Building permits, zoning and septic rules in St. Martinville, Louisiana

At a glance

Building permits

Required before covered construction; start with the city Permits Department¹

Zoning

Municipal district rules govern land use and construction²

Septic permits

Louisiana Department of Health through parish health-unit sanitarians³⁴

RV living

Prohibited as living accommodations in mobile-home or trailer parks; separate flood-zone conditions apply⁵

Manufactured homes

Individual-lot mobile homes allowed in R-3; R-3-R limits them to parks⁶

Owner-builder

Conditional state contractor-license exemption; building permits still required⁷

Private wells

Licensed drilling and state registration; domestic wells have a notification exception⁸

Who to call

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Do you need a building permit in St. Martinville, LA?

St. Martinville requires a building permit before covered construction, enlargement, alterations, repairs, moving, demolition or a change of occupancy; regulated electrical, gas, mechanical and plumbing work also requires the applicable permit.¹ Louisiana’s construction-code enforcement process includes plan review and inspections by a building-code enforcement officer or certified third-party provider.⁹

The city directs applicants to contact its Permits Department with the appropriate form and to contact the inspector’s office before construction or renovations occur.¹ St. Martinville doubles fees for work performed inside city limits without proper permits.¹

Who handles St. Martinville building permits and zoning?

Start a St. Martinville construction application with the city Permits Department; the city publishes a Contractor Permit Request and a Non-Contractor Permit Application, distinguished by whether state law requires a certified contractor.¹ The city lists the inspector’s office at 337-886-6069 for obtaining required permits.¹⁰

City Planning and Zoning has its own inquiry form for zoning questions.¹¹ Ask that office to identify the parcel’s district and applicable residential standards before choosing a house plan.² Onsite sewage questions belong with Louisiana health officials through parish health-unit sanitarians, rather than the city construction application alone.³

Does St. Martinville have zoning, lot-size and setback rules?

St. Martinville’s zoning ordinance requires land use, occupancy and construction to conform to the regulations of the district containing the property.² The residential height limits differ: R-1 and R-2 allow buildings up to 35 feet, while R-3 allows up to 45 feet.¹²¹³¹⁴

St. Martinville’s R-3 district permits a mobile home on an individual lot, while R-3-R prohibits trailers and mobile homes unless they are in a mobile-home park.⁶ Setbacks come from the applicable municipal ordinance and district rather than a statewide numerical standard.¹⁵ We could not confirm a municipal minimum dwelling size; ask City Planning and Zoning for the lot’s minimum area, setbacks and dwelling-size standards before buying.¹¹

How do septic permits work inside St. Martinville?

Louisiana Department of Health sanitarians in parish health units operate the onsite sewage permitting system serving St. Martinville.³ The local Office of Public Health/Sewer Systems contact is listed for new or updated sewer systems.¹⁶

Louisiana requires a permit before installing, altering or operating an individual sewerage system, with approved plans and specifications.⁴ An individual-system installation permit depends on a determination that community-sewer connection is not feasible and that soil, drainage and lot conditions will not create a nuisance or health hazard.⁴ Final approval requires verification through an onsite inspection and/or a licensed installer’s certification.¹⁷ Ask about sewer availability before budgeting for septic: Louisiana allows a septic tank system only where community sewer is unavailable and code requirements are met.¹⁸

Can you live in an RV or tiny home in St. Martinville?

St. Martinville prohibits camper trailers and RVs from being placed in mobile-home or trailer parks and used as living accommodations.⁵ In the specified flood zones, an RV must stay fewer than 180 consecutive days, remain fully licensed and ready for highway use, or meet permit, elevation and anchoring requirements.⁵

Those provisions do not establish permission to live in an RV on an ordinary private lot while building; we could not confirm a general private-lot camping rule or a municipal tiny-home occupancy rule.⁵ Ask City Planning and Zoning about the proposed lot, intended duration and whether a tiny home would qualify as a dwelling under its district regulations.¹¹²

Building a home in St. Martinville: what are the steps?

1. Ask City Planning and Zoning to identify the parcel’s district and confirm that the proposed home and use conform to its regulations.¹¹²
2. Resolve sewer availability; if proposing onsite treatment, work with the parish health-unit sanitarian on the required state permit and site suitability.³⁴
3. Contact the city Permits Department using the appropriate contractor or non-contractor application, and contact the inspector’s office for required construction permits before work begins.¹
4. Arrange plan review and construction inspections through the code-enforcement process.⁹

Louisiana’s owner-builder exemption concerns contractor licensing for a personal residence and requires an exemption affidavit to obtain the building permit; health and life-safety requirements continue to apply.⁷ For property outside city limits, use the St. Martin Parish guide for the parish building-permit answer.¹⁹

Watch-outs

• St. Martinville’s construction-permit payments are cashless beginning in 2026; the city accepts check, money order or credit card.¹
• We could not confirm St. Martinville’s construction fee schedule or certificate-of-occupancy procedure; ask the city Permits Department before committing to a construction budget or move-in date.¹
• New private wells require a licensed driller and state registration; domestic wells use post-installation notification rather than the ordinary advance-notification route.⁸

Sources

1. City of St. Martinville Permits Department (stmartinville.gov)
2. Application of district regulations (St. Martinville), quoted and re-checked
3. Onsite Wastewater Program (St. Martinville), quoted and re-checked
4. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
5. Camper trailers and recreational vehicles (St. Martinville), quoted and re-checked
6. R-3 Residential district (St. Martinville), quoted and re-checked
7. Louisiana Revised Statutes § 37:2157 — Exemptions (Louisiana statewide rule), quoted and re-checked
8. Louisiana Administrative Code, Title 43, Part VI, §701 (Louisiana statewide rule), quoted and re-checked
9. Louisiana building-code enforcement procedures (St. Martinville), quoted and re-checked
10. Inspector’s office listed by St. Martinville (stmartinville.gov)
11. City of St. Martinville Planning and Zoning (stmartinville.gov)
12. R-1 Residential district (St. Martinville), quoted and re-checked
13. R-2 Residential district (St. Martinville), quoted and re-checked
14. R-3 Residential district (St. Martinville), quoted and re-checked
15. RS 33:4721 — Regulation of size and use of buildings (Louisiana statewide rule), quoted and re-checked
16. St. Martin Parish Office of Public Health/Sewer Systems (stmartinparish.net)
17. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
18. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
19. Building Permits (2026 county census)

Written October 11, 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.