Bolthole Index

St. Tammany Parish, Louisiana

Building permits, zoning and land rules in Slidell, Louisiana

Slidell, Louisiana requires a building permit for new construction inside city limits; additions, alterations and repairs may also need one.1 Slidell administers city zoning, while Louisiana health-unit sanitarians operate the onsite sewage permitting system in St. Tammany Parish.23 A septic option depends on whether community sewer connection is feasible, so settle wastewater service before planning an off-grid home.4

At a glance

Building permit
Required for new construction; existing-building changes may also need one.1
Zoning
City zoning applies inside Slidell city limits.2
Septic permits
Louisiana health-unit sanitarians administer onsite sewage permitting; sewer feasibility matters.34
Minimum lot area
R2 single-family: 7,500 square feet; duplex: 8,250 square feet.5
Manufactured-home size
Minimum floor area of 720 square feet; this is not a universal dwelling minimum.6
Owner-builder
State contractor-licensing exemption is conditional and still requires a building permit affidavit.7
Move-in approval
Certificate of Occupancy required before moving into newly constructed residential space.8

Who to call

Building permits

City of Slidell Building Safety

City building permit applications, construction plans and code questions

985-646-4323

[email protected]

250 Bouscaren St. Slidell, LA 70458

Online permits →

Zoning

City of Slidell Planning Department

Parcel zoning, subdivisions and current development regulations; participates in flood-hazard ordinance administration

985-646-4320

[email protected]

250 Bouscaren St., Suite 203 Slidell, LA 70458

Online permits →

Floodplain permits

City of Slidell Engineering Department

Drainage and flood-control plan review; paving, stormwater and utility development applications

985-646-4270

[email protected]

250 Bouscaren St. Slidell, LA 70458

Online permits →

Septic permits

St. Tammany Parish (Slidell) Health Unit-Environmental Health

Local environmental-health contact for onsite wastewater questions

985. 646.6448

520 Old Spanish Trail, Suite 2A, Slidell, LA 70458

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

Off-grid gear

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

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Do you need a building permit in Slidell, LA?

New construction inside Slidell city limits requires a city building permit, and additions, alterations or repairs may require one too.1 Slidell Building Safety provides an online portal for building permit applications and construction plans; contact Building Safety about the proposed scope before starting work.9 Most city approval applications have a fee, collected either at application or when the permit is issued, depending on the application.10 A newly constructed Slidell residence also needs a Certificate of Occupancy before move-in, so a building permit is not the final occupancy approval.8

Who is the Slidell building department, and who handles zoning?

City of Slidell Building Safety is the contact for city building permit applications and construction-plan questions; the Planning Department is the contact for parcel-specific development regulations and zoning.911 Slidell Engineering accepts paving, stormwater, utility and other engineering-related development applications, so ask Engineering about those parts of a project separately from the building permit.12 Onsite sewage permitting is administered through Louisiana health-unit sanitarians rather than being settled by a city building permit.3 For land outside city limits, use the St. Tammany Parish guide: Slidell Planning directs unincorporated-property zoning questions to Parish Planning & Development.11

Does Slidell have zoning, minimum lot sizes and height limits?

Slidell has city zoning and development regulations, and the Planning Department provides a zoning map and parcel-specific guidance.213 In Slidell’s R2 medium-density residential district, a single-family dwelling needs at least 7,500 square feet of lot area and a duplex or two-family dwelling needs at least 8,250 square feet.5 R2 lots for three dwelling units require 9,000 square feet, while four dwelling units require 12,000 square feet.5 The RSF residential single-family district limits building height to 35 feet above adjacent grade.14 Ask Planning to identify the parcel’s district and current setbacks before using any district’s dimensions to design a home; the city warns that the online code may lag adopted legislation.11

How do septic permits work inside Slidell?

Louisiana health-unit sanitarians operate the onsite sewage permitting system, and the Slidell Environmental Health unit is the local contact for wastewater questions.315 Louisiana requires state-health-officer approval before installing, altering or operating an individual sewerage system, including approval of plans and specifications.4 A temporary installation permit depends on a determination that community sewer connection is not feasible and that soil, drainage, lot dimensions and related conditions will not create a nuisance or public-health hazard.4 Slidell’s lot-creation or improvement provision also requires access to compliant drainage, sewer, fire-prevention and water services; that provision does not establish a universal connection rule for every existing parcel.16 Final onsite-system approval requires installation verification through an inspection and/or licensed-installer certification.17

Can you live in an RV or tiny home on land in Slidell?

We could not confirm a Slidell rule authorizing residential RV occupancy on a private lot or a distinct approval path for tiny homes; ask City Planning about the proposed dwelling type and zoning district.11 Slidell’s 720-square-foot minimum applies to manufactured or mobile homes, so that minimum does not answer the size requirement for every small dwelling.6 Slidell prohibits overnight parking or camping in city parks, with a permission exception for qualifying civic, church or school groups; the park rule does not settle residential use of a private lot.18 Off-grid sanitation still requires approved plans and state health permitting, with individual sanitation limited to situations where community sewer is unavailable or connection is not feasible.19

What are the steps for building a home in Slidell?

  1. Ask Slidell Planning for the parcel’s zoning district and current development regulations before designing the project.11
  2. Resolve any boundary changes through the city subdivision process: combining lots, moving an internal property line or creating lots requires subdivision approval.20
  3. Ask Engineering about paving, stormwater and utility applications, and resolve onsite wastewater approval with the health unit if community sewer connection is not feasible.124
  4. Apply to Building Safety for the new-construction building permit; a qualifying owner-builder must supply the state exemption affidavit to obtain the permit, and health and life-safety codes still apply.17
  5. Arrange construction inspections with Building Safety and obtain the Certificate of Occupancy before moving into the new residence.2198

What should you check before buying land in Slidell?

Flood status deserves an early conversation with Slidell Planning: the city says just over half of Slidell lies in a Special Flood Hazard Area.11 Ask Engineering about the paving, stormwater and utility applications associated with the proposed site work.12 For a parcel needing onsite wastewater, Louisiana’s suitability review considers soils, drainage and lot size as well as sewer feasibility, so lot area alone does not establish septic approval.4 If a private well is proposed, Louisiana requires a licensed water-well drilling contractor and registration within 30 days after completion; domestic wells follow post-installation notification rules rather than the ordinary prior-notification requirement.22 Ask Planning for the current parcel regulations before relying on the online code.11

Watch-outs

  • Slidell’s online code may not reflect the newest city legislation; ask the Planning Department for the current rules affecting the parcel.11
  • The state owner-builder exemption concerns contractor licensing and requires a permit affidavit; health and life-safety requirements still apply.7
  • We could not confirm Slidell’s project-specific residential inspection schedule; ask Building Safety to identify required inspections before construction.9

Sources

  1. City of Slidell Planning Department Development Process (Slidell), quoted and re-checked
  2. Planning - The City of Slidell, Louisiana (Slidell), quoted and re-checked
  3. Onsite Wastewater Program (Slidell), quoted and re-checked
  4. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
  5. UDC Section 6.2.5 R2 medium density residential district (Slidell), quoted and re-checked
  6. UDC Section 7.1.8 Manufactured or mobile homes (Slidell), quoted and re-checked
  7. Louisiana Revised Statutes § 37:2157 — Exemptions (Louisiana statewide rule), quoted and re-checked
  8. City of Slidell Planning Department Development Process (Slidell), quoted and re-checked
  9. City of Slidell Building Safety (myslidell.com)
  10. City of Slidell Planning Department Development Process (Slidell), quoted and re-checked
  11. City of Slidell Planning Department (myslidell.com)
  12. City of Slidell Engineering Department (myslidell.com)
  13. Planning - The City of Slidell, Louisiana (Slidell), quoted and re-checked
  14. UDC Section 6.2.3 RSF residential single-family district (Slidell), quoted and re-checked
  15. St. Tammany Parish (Slidell) Health Unit-Environmental Health (ldh.la.gov)
  16. UDC Section 10.2.1 Lots and blocks (Slidell), quoted and re-checked
  17. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
  18. Code Section 19-6 Overnight parking (Slidell), quoted and re-checked
  19. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
  20. City of Slidell Planning Department Development Process (Slidell), quoted and re-checked
  21. R.S. 40:1730.23 — Enforcement of building codes by municipalities, parishes, and the fire marshal (Louisiana statewide rule), quoted and re-checked
  22. Louisiana Administrative Code, Title 43, Part VI, §701 (Louisiana statewide rule), 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.

Answers from the rulebook for Slidell

Slidell’s own rules

  • Building permitRequired

    New construction inside Slidell city limits.

    • A permit may also be required for additions, alterations, or repairs.
    “A Building Permit is required for new construction, and may be for any change to an existing building, such as additions, alterations, or repairs.”
  • Certificate of occupancyRequired

    Newly constructed residential space and existing commercial or industrial space inside Slidell city limits.

    • The source separately states the existing commercial or industrial-space condition.
    “You must get a Certificate of Occupancy before moving into any existing commercial or industrial space, or any newly constructed residential space.”
  • Local zoningPresent

    Land inside Slidell city limits; the City administers its own zoning and development regulations.

    • The City planning page states that development regulations are in the City Code, notably Appendix A Zoning and Appendix B Subdivision Regulations.
    “Development regulations are located in several sections of the City’s Code of Ordinances, notably Appendix A Zoning and Appendix B Subdivision Regulations.”
  • Zoning districtsPublished

    Zoning districts inside Slidell city limits.

    • The City provides a zoning map and identifies Appendix A Zoning as a principal source of development regulations.
    • The City warns that the Municode code may not reflect the most current legislation and advises contacting a planner.
    “Development regulations are located in several sections of the City’s Code of Ordinances, notably Appendix A Zoning and Appendix B Subdivision Regulations.”
  • Minimum dwelling sizeSpecified

    Manufactured or mobile homes inside Slidell city limits.

    • This numeric minimum is stated for manufactured or mobile homes, not for every dwelling type.

    minimum floor area: >= 720 square feet

    “The minimum floor area of the manufactured home must be 720 square feet.”
  • Minimum lot sizeDistrict specific (with conditions)

    Residential development in the R2 medium-density residential district.

    • Lot area varies by dwelling-unit count.

    single-family dwelling minimum lot area: >= 7500 square feet · duplex or two-family minimum lot area: >= 8250 square feet · three dwelling units minimum lot area: >= 9000 square feet · four dwelling units minimum lot area: >= 12000 square feet

    “Minimum lot area is dependent upon the type of dwelling unit proposed, as follows: a. Single-family dwelling: 7,500 square feet. b. Duplex or two-family dwelling: 8,250 square feet. c. Three dwelling units: 9,000 square feet. d. Four dwelling units: 12,000 square feet.”
  • Building heightDistrict specific (with conditions)

    RSF district.

    maximum building height: <= 35 feet above adjacent grade

    “Maximum building height: 35 feet above adjacent grade.”
    One more reviewed finding on this topic
  • Camping on your landLimited

    Overnight parking or camping in City of Slidell parks.

    • An exception applies to bona fide civic, church, or school groups that have applied to and received permission from the director of parks and recreation.
    “There shall be no overnight parking and/or camping in any city park. The provisions of this section shall not apply to bona fide civic, church or school groups who have made application to and received permission from the director of parks and recreation of the city for the utilization of city park grounds for recreational camping purposes.”
  • Mandatory utility hookupConditional

    Lots of record created or improved inside Slidell city limits.

    • The cited provision concerns lot creation or improvement and requires access to sewer and water services; it does not state a universal connection rule for every existing parcel.
    “Have access to drainage, sewer, fire prevention, and water services meeting the requirements of the Code of Ordinances or the UDC at the time of lot designation;”
  • Subdividing landRegulated (with conditions)

    Property-boundary changes and subdivision inside Slidell city limits.

    • The City states that subdivision is needed for combining lots, moving an internal property line, or creating new lots.
    • Planning Commission handles subdivisions and resubdivisions.
    “You will need a Subdivision if you want to make any changes to property boundaries, such as combining lots, moving an internal property line, or creating new lots.”
  • Permit feesVariable (with conditions)

    City approvals and permits inside Slidell city limits.

    • Fees vary by application and may be collected at application or permit issuance; no fee schedule was located in the opened sources.
    “Most applications have an application fee; some are collected at the time of application and others are collected when the permit is issued.”

Rules another office applies inside Slidell

Slidell does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Who permits septicMixed (with conditions)

    Onsite wastewater systems serving property inside Slidell city limits.

    • Louisiana administers the statewide onsite-wastewater program; parish health-unit sanitarians operate the permitting system. The opened official pages did not establish whether a particular Slidell parcel may use septic instead of public sewer.
    “Sanitarians located in the health units of each parish serve to inform, advise, and operate a permitting system with regard to onsite sewage treatment.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Slidell or St. Tammany Parish directly.

  • Owner-builder exemption — Owner-builders constructing inside Slidell city limits.
  • Inspections — Building inspections inside Slidell city limits.
  • Lot coverage — Residential development inside Slidell city limits.
  • Tiny homes — Tiny-home occupancy inside Slidell city limits.
  • Septic permit — Onsite wastewater systems inside Slidell city limits.
6 more unanswered
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Driveway access
  • Short-term rentals

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 Slidell publishes no rule on the point, not that none exists. St. Tammany Parish’s page lists the county offices to call.

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