Building permits, zoning and septic rules in Patterson, Louisiana

At a glance

Building permits

Required for code-covered construction; city application available¹²

Zoning

City zoning applies inside Patterson³

Septic permits

State health approval; local contact is the parish health unit⁵

Lot size

R-10: 10,000 square feet per living unit; 100-foot minimum width⁶

RV living

Published RV park rules do not establish permission to live on a private lot; ask city Planning & Zoning⁷⁸

Owner-builder

Conditional contractor licensing exemption; building and health requirements still apply⁹

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 Patterson, LA?

Patterson home construction covered by Louisiana’s State Uniform Construction Code requires building permits; the statewide residential mandate covers new construction, reconstruction, additions to homes previously built to the residential code, and extensive alterations.¹ Patterson’s Building Department publishes a city building permit application and directs applicants to email building plans to [email protected].²

Patterson historic district work can also require a commission application for new buildings and specified exterior work fronting a public street or alley; repainting the same color and repairs restoring the preexisting condition are exceptions to that commission requirement.¹⁰ Do not treat a historic commission exception as an exemption from the separate construction approval process.¹⁰¹

Who handles Patterson building permits and zoning questions?

Start with the Patterson Building Department for the city building permit application and building plan submission instructions.² City Hall’s published contact is (985) 395-5205, and the city also has a Planning & Zoning page for municipal land-use questions.²⁸

The Building Department page separately lists permit categories for mobile homes, portable sheds, culverts, roofing, pools, signs, electrical panels and demolition.² For a mobile home, Patterson requests the title, plot plan and mover information, and requires plumbing installed by a licensed plumber.² Septic approval remains with Louisiana health officials, so a city building application does not replace state onsite sewage approval.⁴

Does Patterson have zoning, lot sizes and setbacks?

Patterson has municipal zoning, and dimensional requirements depend on the district rather than a single citywide lot-size rule.³⁶ In Patterson’s Residential R-10 district, dwellings require at least 10,000 square feet of lot area per living unit and a minimum lot width of 100 feet.⁶ R-10 dwelling yards must be at least 30 feet deep in front, 10 feet in the rear and 5 feet at the sides.¹¹

Use the zoning map linked by the city Building Department and ask Patterson Planning & Zoning to confirm the parcel’s district before applying those dimensions to a purchase or house design.²⁸ Patterson also tells applicants to verify that a proposed mobile home fits the property, including setbacks and easements.²

How do septic permits work inside Patterson?

Individual onsite sewage systems serving Patterson property require a permit from the Louisiana state health officer before installation, alteration or operation, with approved plans and specifications.¹² A municipality cannot authorize installation without written Office of Public Health approval.⁴ Contact Environmental Health at the St. Mary Parish Health Unit in Morgan City for the local state permitting route.¹³⁵

Louisiana’s individual-system approval depends on determining that connection to community sewerage is not feasible, so resolve sewer availability before planning a septic system.¹² St. Mary Parish’s soil figures show 0% rated “not limited” for conventional drain fields; that parishwide screening does not make septic impossible or determine a Patterson lot’s suitability, but supports arranging a site evaluation before committing to a conventional system.¹⁴

Can you live in an RV or tiny home in Patterson?

Patterson’s verified RV provisions concern recreational vehicle parks: public water connection is required where a public supply is available, and each RV space needs an accessible, adequate, safe sewer connection.⁷ Patterson trailer park rules separately require sanitary sewer connections and compliance with parish health unit and state health department standards.¹⁵ These park provisions do not establish permission to live in an RV on an ordinary private residential lot.⁷

We could not confirm a Patterson rule allowing private-lot RV living while building, or a tiny-home-specific occupancy rule; ask Patterson Planning & Zoning about the proposed use and the Building Department about construction approval before buying or moving a unit onto the parcel.⁸²

Building a home in Patterson: what are the steps?

1. Confirm the Patterson parcel’s zoning district with city Planning & Zoning and compare the site plan with the applicable lot and yard requirements.⁸⁶¹¹
2. Resolve community sewer availability; if an individual system is proposed, contact the St. Mary Parish Health Unit for state health approval before installation.¹²⁵
3. Use the city Building Department’s building permit application and email building plans as instructed on its page.²
4. Ask the Building Department for the inspection schedule, current fees and occupancy approval requirements for the project.²

Louisiana’s owner-builder option is a contractor licensing exemption for a qualifying personal residence, with an affidavit and continuing health and life-safety requirements; it does not remove the building approval obligations.⁹

What should you check before buying land in Patterson?

Patterson subdivision and manufactured-home-park proposals must meet the floodplain development permit requirements referenced in the city’s flood damage prevention ordinance.¹⁶ For a house parcel, ask the city Building Department to review the flood map it publishes and identify the project’s floodplain approval requirements before you settle on a design.²

If a private well is proposed, Louisiana requires licensed drilling and registration of new wells, while domestic wells fall under post-installation notification rather than the ordinary advance-notification rule.¹⁷ A driveway connecting to a Louisiana state highway requires the applicable DOTD access approval before construction.¹⁸ For property outside Patterson city limits, consult the St. Mary Parish guide: the parish’s development code applies to unincorporated land.¹⁹

Watch-outs

• Patterson’s R-10 lot and setback dimensions are district-specific; confirm the parcel’s zoning with city Planning & Zoning.⁶¹¹⁸
• Patterson RV park utility rules do not establish permission for private-lot RV occupancy; ask city Planning & Zoning before planning to live onsite during construction.⁷⁸
• City building approval cannot substitute for written Louisiana Office of Public Health approval of an individual sewage system.⁴

Sources

1. Louisiana Revised Statutes 40:1730.23 — Enforcement of building codes by municipalities and parishes (Louisiana statewide rule), quoted and re-checked
2. Patterson Building Department (cityofpattersonla.gov)
3. Code of Ordinances, Appendix A—Zoning, Sec. 4.1—Schedule of district regulations (Patterson), quoted and re-checked
4. RS 40:5. General powers and jurisdiction, quoted and re-checked
5. Onsite Wastewater Program, quoted and re-checked
6. Code of Ordinances, Appendix A—Zoning, Sec. 4.1—Schedule of district regulations (Patterson), quoted and re-checked
7. Code of Ordinances, Appendix A—Zoning, Sec. 5.4.1—Recreational Vehicles where permitted (Patterson), quoted and re-checked
8. Patterson Planning & Zoning (cityofpattersonla.gov)
9. Louisiana Revised Statutes § 37:2157 — Exemptions (Louisiana statewide rule), quoted and re-checked
10. Code of Ordinances, Chapter 24, Sec. 24-8—Historic district permits and mobile homes (Patterson), quoted and re-checked
11. Code of Ordinances, Appendix A—Zoning, Sec. 4.1—Schedule of district regulations (Patterson), quoted and re-checked
12. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
13. St. Mary Parish Health Unit (ldh.la.gov)
14. 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
15. Code of Ordinances, Appendix A—Zoning, Sec. 5.4—Trailers where permitted (Patterson), quoted and re-checked
16. Code of Ordinances, Chapter 20, Sec. 20-68—Standards for subdivision proposals (Patterson), quoted and re-checked
17. Louisiana Administrative Code, Title 43, Part VI, §701 (Louisiana statewide rule), quoted and re-checked
18. LaDOTD Access Connections Policy (Louisiana statewide rule), quoted and re-checked
19. Unified Development Ordinance, quoted and re-checked

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.