Building permits, zoning and land rules in Washington Parish, Louisiana

At a glance

Building permit

Required before covered construction, reconstruction or development in unincorporated Washington Parish¹

Zoning

The parish development ordinance applies in unincorporated Washington Parish³

Mobile homes

Permit before moving; no more than 2 per parcel or 1 per acre; 30-foot property-line setback⁴

Subdivision lots

At least 1 acre per single-family unit, with frontage requirements⁵

Septic

LDH oversees onsite wastewater; a Health Unit sanitation letter is required for a new-home building permit⁷⁶

RV living

Approved RV parks treat 1 month or less as temporary and prohibit stays over 3 months in any 12-month period⁸⁹

Owner-builder

Available for a primary residence the owner will occupy, using the required exemption form¹⁰

Water wells

New wells require a licensed driller and state registration after completion¹¹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 7, 2026.

Do you need a building permit in Washington Parish, Louisiana?

Yes. Unincorporated Washington Parish requires a permit before covered construction, reconstruction or development, including building, major remodeling, manufactured-home placement and flood repair.¹ Washington Parish must enforce the Louisiana State Uniform Construction Code through plan review, inspections and permit decisions; qualifying one- and two-family homes designed within prescriptive residential-code standards do not require architect- or engineer-stamped plans.² The published fee schedule lists residential structures at $0.55 per square foot under beam, including a $0.25-per-square-foot administrative fee.¹² Qualifying agricultural structures are exempt from the parish permit fee, but the fee exemption does not establish an exemption from permits or construction codes.¹³ An owner may build a primary residence without a contractor license only if the owner will live there, obtains the local permit and files the homeowner exemption form; the exemption does not cover a home built to rent or sell, and other laws and codes still apply.¹⁰

Who issues building permits in Washington Parish, and how do you apply?

The Washington Parish Building and Permitting Department issues development permits from 203 11th Avenue in Franklinton and can be reached at 985-839-5456.¹⁴ The parish provides MyGovernmentOnline for online permit applications.¹⁴ For a new single-family home, first obtain a 911 address and sanitation letter, then submit the completed application, septic letter, two plan sets including a site plan, proof of ownership and an elevation certificate if the site is in a flood zone; the process also includes the permit fee and energy-compliance recheck, and the reviewer may request more information.¹⁵ Permitted homes move through inspections that can include base-flood elevation where applicable, pre-pour plumbing, footings and foundation, rough-in work, insulation and a final inspection.¹⁶ Approved plans must remain at the job site for inspections, subject to the parish's listed exceptions.¹⁶

Does Washington Parish have zoning?

Washington Parish has a development ordinance that applies throughout its unincorporated area and is administered by the Permit Office.³ A manufactured home must stand at least 30 feet from every property line.¹⁷ New subdivision lots using individual sewerage treatment must contain at least 1 acre per single-family living unit and provide 140 feet of road frontage, although cul-de-sac frontage may be 75 feet.⁵ Lots served by approved community sewerage and water also require at least 1 acre, with 100 feet of frontage or 75 feet on a cul-de-sac.⁵ A complete zoning-district map, minimum dwelling size, general height limit and lot-coverage rule could not be confirmed; ask the Planning Commission about the particular parcel.¹⁸

How do septic permits work in Washington Parish?

The Louisiana Department of Health Office of Public Health controls domestic-sewage treatment and disposal, including onsite wastewater regulation in Washington Parish.⁷ A new single-family building-permit application in unincorporated Washington Parish must include a Health Unit sanitation letter, and the onsite system needs Parish Health Department approval under the Louisiana Sanitary Code.⁶ Start with the Washington Parish Health Unit's environmental-health office at 120 11th Street in Franklinton, 985-839-5646.¹⁹ For a subdivision or land development where sanitary sewer is unavailable and is not expected within 3 years, the developer or buyer must install an onsite septic tank, oxidation pond or another approved treatment method; soil tests may be required, and the system must meet state health, sanitary-code and parish public-works requirements.²⁰ Only 20.7% of parish soils are rated without severe limits for a conventional drain field, so make septic feasibility an early purchase contingency.²¹ Final verification may use a state representative's site inspection, an installer certification or both.²²

Can you live in an RV or tiny home in Washington Parish?

In an approved Washington Parish RV park, the ordinance defines temporary camping as 1 month or less.⁸ Occupancy beyond 3 months in any 12-month period is treated as permanent and prohibited, subject to the stated exception for qualifying transient workers.⁹ An RV park must connect to public sewer when it is available within 300 feet; otherwise the park needs an approved private sewerage facility, and every park needs potable water.²³ These RV-park rules do not answer whether an owner may occupy an RV on an ordinary private parcel, so ask Planning and Building before moving in or connecting utilities.⁸¹⁸¹⁴ A mobile home needs a permit before it is moved; Washington Parish allows no more than 2 mobile homes per parcel or 1 per acre, requires a licensed mover and Wind Zone 2 or 3, and requires a Planning Commission waiver before a home older than 30 years may be moved.⁴ A specific tiny-home occupancy rule and general minimum dwelling size could not be confirmed; a tiny home used as a dwelling remains subject to the applicable permit and construction-code rules.¹²

What are the steps to build a home in Washington Parish?

1. Ask the Planning Commission how the parish development ordinance and any subdivision conditions apply to the parcel.³¹⁸

1. Confirm that a newly divided lot meets the applicable acreage and frontage rules; for a manufactured home, also confirm the 30-foot property-line setback and parcel-density limits.⁵⁴

1. Confirm flood status before design; an AE Floodway does not allow new construction, substantial improvements or fill under the parish rule.²⁴

1. Obtain the 911 address and Health Unit sanitation letter before applying for the residential permit.¹⁵¹⁹

1. Submit the application, septic letter, two plan sets with a site plan, proof of ownership and any required flood-zone elevation certificate; include the fee and energy-compliance recheck.¹⁵

1. If using the owner-builder exemption, file the homeowner exemption form for the primary residence you will occupy.¹⁰

1. Schedule the required inspections and keep approved plans at the job site.¹⁶

What should you check before buying land in Washington Parish?

Put flood status, septic feasibility and legal access ahead of the house plan. Washington Parish prohibits new construction, substantial improvements and fill in an AE Floodway, while only 20.7% of parish soils are rated without severe limitations for conventional drain fields.²⁴²¹ If a tract will be divided or developed, the parish reviews subdivision and land-development plans under standards that cover lot size, density, streets, private roads, curb cuts and access.²⁵ If access will connect to a Louisiana state highway, the state driveway permit must be signed and numbered before construction begins.²⁶ New water wells require a licensed driller and state registration within 30 days after completion; domestic wells use the post-installation notification route.¹¹ The effective property-tax rate is about 0.4%, with a median annual bill near $488.²⁷²⁸

Watch-outs

• An AE Floodway site does not allow new construction, substantial improvements or fill under Washington Parish's floodplain rule.²⁴
• The parish's agricultural-structure provision waives qualifying permit fees; it does not confirm an exemption from permits or construction codes.¹³
• A manufactured home must remain at least 30 feet from every property line, and Washington Parish limits placement to 2 mobile homes per parcel and 1 per acre.⁴
• Washington Parish's RV-park camping and occupancy limits do not answer whether an RV may be occupied on an ordinary private parcel; ask Planning and Building before relying on an RV during construction.⁸⁹¹⁸¹⁴

Sources

1. Building Permits, quoted and re-checked
2. RS 40:1730.23 — Enforcement of building codes by municipalities and parishes, quoted and re-checked
3. Washington Parish Development Ordinance, quoted and re-checked
4. Permitting a Mobile Home, quoted and re-checked
5. Washington Parish Development Ordinance, quoted and re-checked
6. New Construction Residential Permitting Procedure, quoted and re-checked
7. Louisiana Revised Statutes §40:5.6, quoted and re-checked
8. Washington Parish Development Ordinance, quoted and re-checked
9. Washington Parish Development Ordinance, quoted and re-checked
10. Louisiana State Licensing Board for Contractors FAQ, quoted and re-checked
11. Louisiana Administrative Code, Title 43, Part VI, §701 (Louisiana statewide rule), quoted and re-checked
12. Permit Fee Sheet, quoted and re-checked
13. Permit Fee Sheet, quoted and re-checked
14. Washington Parish Building and Permitting Department (wpgov.org)
15. New Construction Residential Permitting Procedure, quoted and re-checked
16. Required Inspections for Residential Structures, quoted and re-checked
17. Permitting a Mobile Home, quoted and re-checked
18. Washington Parish Planning Commission (wpgov.org)
19. Washington Parish (Franklinton) Health Unit (ldh.la.gov)
20. Washington Parish Development Ordinance, quoted and re-checked
21. 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
22. Louisiana Administrative Code Title 51, Part XIII, Public Health—Sanitary Code (Louisiana statewide rule), quoted and re-checked
23. Washington Parish Development Ordinance, quoted and re-checked
24. Building Permits, quoted and re-checked
25. Washington Parish Development Ordinance, quoted and re-checked
26. LaDOTD Access Connections Policy (Louisiana statewide rule), quoted and re-checked
27. Effective property tax rate: Bolthole Index county data
28. Median property tax bill: Bolthole Index county data

Written October 7, 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.