Bolthole Index

Lafourche Parish, Louisiana

Zoning, building permits and septic rules in Thibodaux, Louisiana

Thibodaux, Louisiana (Lafourche Parish) has its own zoning ordinance, run by the city's Planning and Zoning Board1. Building permits inside city limits are required and issued by the city, not the parish2. Septic permits for any individual sewerage system in Louisiana come from the state health officer, not the city3. Land outside city limits falls under Lafourche Parish, which has no zoning4.

At a glance

Zoning
Yes, city zoning ordinance with a zoning map1
Building permit
Required inside city limits; issued by the city2
Building code
2021 International Residential Code for houses5
Septic
State health officer permit; city rule unconfirmed3
R-1 minimum lot
7,500 sq ft for a single-family home (confirm in ordinance)6
Lot coverage
60% in residential districts7
Outside city limits
Lafourche Parish: no zoning4

Who to call

Building permits

City of Thibodaux Public Works, Building and Permits

Building, electrical, mechanical and plumbing permits, inspections and certificates of occupancy inside Thibodaux city limits

(985) 446-7223

1219 Henry S. Thibodeaux St. Thibodaux LA, 70302

Planning & zoning

City of Thibodaux Planning and Zoning Board

Zoning ordinance and map, zoning changes, variances and special exceptions, and subdivisions inside Thibodaux city limits

(985) 446-7223

1219 Henry S. Thibodeaux St. Thibodaux LA, 70302

Septic permits

Louisiana Department of Health, Onsite Wastewater Program (Lafourche Parish Health Unit)

Septic (onsite sewage) permits under the Louisiana Sanitary Code; the parish health unit serves Lafourche Parish

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

Going off-grid in Thibodaux means bringing your own water and power. The kit we’d start with:

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Does Thibodaux have zoning, and what does it mean for lot size and setbacks?

Yes. Thibodaux, Louisiana adopts its own zoning ordinance with a zoning map, administered by the city's Planning and Zoning Board18. The ordinance sorts land into residential, business, commercial, industrial and open-space districts9.

Rules differ by district. In the R-1 residential district, the single-family minimum lot area reads 7,500 sq ft, though the ordinance table is hard to parse and should be confirmed against the posted PDF6. Residential districts allow 60% lot coverage on lots of 6,000 sq ft or more7. Short-term rentals are a listed use that varies by district and needs a city occupancy permit, with a six-bedroom cap10.

We could not confirm Thibodaux's rules on living in an RV, tiny homes, accessory dwellings or minimum house size. Ask the Planning and Zoning Board before you plan around any of them8.

Do you need a building permit in Thibodaux, and who issues it?

Yes. Thibodaux requires a building permit for construction, alteration, moving, demolition or change of occupancy inside city limits2. The city's Public Works Department, Building and Permits division issues them, with separate electrical, mechanical and plumbing permits11.

Houses are built to the 2021 International Residential Code5. Exempt work includes painting, siding, and unroofed wood decks up to 30 inches above grade and 400 sq ft2. Permit fee schedules and application packets are posted on the city's permit page, which also notes procedure changes effective April 20251213.

How do inspections and the certificate of occupancy work in Thibodaux?

Building inspections happen at the foundation, framing and completion stages11. The contractor or tradesperson doing the work must request each inspection, by calling (985) 446-7208 for building, electrical, mechanical and plumbing11. A $20 re-inspection fee applies after the initial free inspections14.

New buildings need a certificate of occupancy, issued after all inspections pass and costs are paid, and no one may move in before it is issued1511.

How do septic permits work in Thibodaux?

Septic permits in Thibodaux are not a city matter. Louisiana law requires a permit from the state health officer before anyone installs, alters or operates an individual sewerage system, with plans approved as part of the permit3. The Louisiana Department of Health's Lafourche Parish Health Unit handles these permits for the parish16.

A septic system is allowed only where community sewerage is unavailable or connection is not feasible17. Whether a given lot inside Thibodaux must connect to city sewer, and how the city treats wells, we could not confirm; ask Public Works at (985) 446-722311. In Lafourche Parish overall, USDA rates 0% of soils as not limited for a conventional drain field, so expect a site evaluation or an engineered system18.

Building a home in Thibodaux: the steps, in order

  1. Confirm the lot's zoning district and any lot-size, coverage or use limits with the Planning and Zoning Board98.
  2. Check the city's flood zone map for the lot8.
  3. If you are dividing land, ask about subdivision review by the Planning and Zoning Board19.
  4. Apply for the building permit from the city's Building and Permits division211.
  5. Get the septic permit from the Louisiana Department of Health, or confirm sewer connection with Public Works3.
  6. Have your contractor schedule foundation, framing and completion inspections11.
  7. Collect the certificate of occupancy before moving in15.

What stays with Lafourche Parish, and what to check before you buy?

Land outside Thibodaux city limits is governed by Lafourche Parish, not the city. Unincorporated Lafourche Parish has no zoning4, and the parish permits department, not the city, issues building permits there20. Confirm which side of the city line a parcel sits on before you call either office.

A driveway onto a state highway needs a state permit from LaDOTD21. Lafourche Parish gets 63.2 inches of rain a year22, so check flood risk. Parish-level property tax is an effective rate of 0.5% with a median bill of $951 a year2324.

Watch-outs

  • Owner-builder rules inside Thibodaux are unconfirmed; Louisiana's contractor-licensing exemption covers a personal residence, limited to one residence per year, so ask the city permit office how it applies25.
  • Do not assume parish rules apply inside the city: unincorporated Lafourche Parish has no zoning, while Thibodaux does14.
  • We could not confirm whether the city's floodplain ordinance adds elevation requirements; ask the Planning and Zoning Board, which posts a flood zone map8.

Sources

  1. City of Thibodaux Comprehensive Zoning Ordinance (Rev 9-26) (Thibodaux), quoted and re-checked
  2. City of Thibodaux Permits Required (Thibodaux), quoted and re-checked
  3. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
  4. Planning – Lafourche Parish Government, quoted and re-checked
  5. City of Thibodaux Building Code Requirements (Thibodaux), quoted and re-checked
  6. City of Thibodaux Comprehensive Zoning Ordinance (Rev 9-26) (Thibodaux), quoted and re-checked
  7. City of Thibodaux Comprehensive Zoning Ordinance (Rev 9-26) (Thibodaux), quoted and re-checked
  8. City of Thibodaux Planning and Zoning Board (ci.thibodaux.la.us)
  9. City of Thibodaux Comprehensive Zoning Ordinance (Rev 9-26) (Thibodaux), quoted and re-checked
  10. City of Thibodaux Comprehensive Zoning Ordinance (Rev 9-26) (Thibodaux), quoted and re-checked
  11. City of Thibodaux Public Works, Building and Permits (ci.thibodaux.la.us)
  12. Building and Inspection Permits - City of Thibodaux (Thibodaux), quoted and re-checked
  13. Building and Inspection Permits - City of Thibodaux (Thibodaux), quoted and re-checked
  14. Building and Inspection Permits - City of Thibodaux (Thibodaux), quoted and re-checked
  15. Building and Inspection Permits - City of Thibodaux (Thibodaux), quoted and re-checked
  16. Louisiana Department of Health - Onsite Wastewater Program (2026 county census)
  17. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
  18. 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
  19. Planning and Zoning Board - City of Thibodaux (Thibodaux), quoted and re-checked
  20. Permits – Lafourche Parish Government, quoted and re-checked
  21. LaDOTD Access Connections Policy (Louisiana statewide rule), quoted and re-checked
  22. Annual precipitation: Bolthole Index county data
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data
  25. Louisiana Revised Statutes § 37:2157 — Exemptions (Louisiana statewide rule), quoted and re-checked

Written October 24, 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.

Answers from the rulebook for Thibodaux

Thibodaux’s own rules

  • Building permitRequired

    Construction, alteration, moving, demolition or change of occupancy inside Thibodaux city

    • Exempt: painting/finish work; soffit/fascia and siding; fence repair up to 25 linear feet; fences under 30 inches high; unroofed wood decks up to 30 inches above grade and 400 sq ft; replacing residential driveways without alteration.
    • Missed inspections carry a $100 fine.
    “building permits are required by any owner, authorized agent, or contractor who desires to construct, enlarge, alter, repair, move, demolish or change the occupancy of a building or structure”
  • Building code adoptedAdopted

    Construction inside Thibodaux city

    • Residential: 2021 IRC; commercial: 2021 IBC and 2021 IEBC; 2020 NEC; 2021 IPC, IFGC, IMC.
    “building codes: residential construction — 2021 international residential code commercial construction— 2021 international building code 2021 international existing building code”
  • InspectionsRequired

    Permitted building work inside Thibodaux city

    • Electrical, mechanical, plumbing and gas inspections are separate stages.
    • Requests must be made by the contractor; $20 re-inspection fee after the initial free inspections.
    “building inspection shall be performed in the foundation, framing and completion stages.”
  • Certificate of occupancyRequired

    New buildings inside Thibodaux city

    • Issued after all inspections are complete and all costs paid.
    “no one shall be allowed to move in until certificate of occupancy has been issued.”
  • Local zoningPresent

    Land inside Thibodaux city limits

    • City posts the ordinance as 'zoning ordinance 11-1-14 - rev 9-26' with a zoning map; administered by the Planning and Zoning Board.
    “city of thibodaux comprehensive zoning ordinance”
  • Zoning districtsPublished

    Inside Thibodaux city

    • Districts include R-1 to R-4, RB, B-1, C-1, C-2, CBD, I-1, I-2, OS, C; zoning map PDF posted.
    “table 5.1: residential district permitted uses and special exceptions uses dwelling, single-family detached”
  • Minimum lot sizeDistrict specific (with conditions)

    R-1 residential district inside Thibodaux city

    • Other residential districts (R-2 to R-4, RB) have different minimums, e.g. 6,000 sq ft single-family in some districts.
    • Source table text is jumbled; confirm the R-1 column against the PDF.

    R-1 minimum lot area, single-family: >= 7500 sq ft (other uses 10,000 sq ft)

    “maximum building height maximum lot coveragee districts r-1 sf: 7,500 sf other: 10,000 sf r-2 r-3 bulk regulations”
  • Lot coverageDistrict specific (with conditions)

    Residential districts inside Thibodaux city (Table 5.2)

    • Table shows 60% for the residential districts; footnote applies it to residential lots of 6,000 sq ft or greater.

    maximum lot coverage: 60% (applicable to residential lots 6,000 sq ft or greater)

    “e applicable to residential lots six thousand (6,000) square feet or greater.”
  • Subdividing landRegulated (with conditions)

    Land subdivision inside Thibodaux city

    • Planning and Zoning Board handles public subdivisions, family subdivisions and administrative resubdivisions; fee schedule posted.
    “public subdivision plats statement of ordinance violation subdivision fee schedule subdivision application form”
  • Short-term rentalsLimited

    Short-term rentals inside Thibodaux city

    • Listed as a use in Table 5.1 with district-specific permitted/special exception status; the city issues a short term rental occupancy permit.
    • Max 6 bedrooms and guests no more than twice the bedrooms or 12 persons.

    maximum bedrooms: <= 6 bedrooms · maximum guests: <= 12 persons (2 times bedrooms)

    “short term rental: a residential dwelling unit, or any portion thereof, for the purpose of lodging for less than 30 consecutive days. the maximum number of bedrooms used for a short term rental use in the short term dwelling unit shall be no greater than six (6) and the total number of guests staying in the short term rental dwelling unit at any time shall be no greater than two (2) times the number of bedrooms or a maximum of twelve (12) persons. (ord. no. 3243, 11-15-22)”
  • Permit feesPublished

    Building, electrical, mechanical and plumbing permits inside Thibodaux city

    • Fee amounts are in linked PDFs not opened.
    “building permit fee rates - commercial build out shopping center permit packet”
  • Permit processPublished

    Permits inside Thibodaux city

    • Online application links and permit packets; inspections by phone (985) 446-7208; permit procedure changes effective 4-1-25.
    “phone number to call for building, electrical, mechanical & plumbing inspections: (985) 446-7208.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Thibodaux or Lafourche Parish directly.

  • Owner-builder exemption — Owner-builders inside Thibodaux city
  • Minimum dwelling size — Inside Thibodaux city
  • Living in an RV — RV occupancy on private lots inside Thibodaux city
  • Camping on your land — Inside Thibodaux city
  • Tiny homes — Inside Thibodaux city
10 more unanswered
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Thibodaux publishes no rule on the point, not that none exists. Lafourche Parish’s page lists the county offices to call.

← All of Lafourche Parish: county rules, score and offices