Unincorporated Harrison County, Mississippi requires building permits, with permits needed there handled by Harrison County Code Administration12. County zoning controls land use and dimensional standards, while the Mississippi State Department of Health administers onsite wastewater work in Harrison County34. Permanent RV occupancy is prohibited in unincorporated Harrison County, although narrow temporary-use provisions exist for qualifying land56.
At a glance
- Building permit
- Required in unincorporated Harrison County; Code Administration handles permits needed there12
- Zoning
- Yes; district rules cover uses and dimensional standards37
- Septic
- Administered through the Mississippi State Department of Health and county health office48
- RV living
- Permanent RV occupancy is prohibited in unincorporated areas; limited temporary use requires qualifying land and approval56
- Tiny home
- A countywide occupancy rule was not confirmed; ask Zoning how the parcel's district classifies the proposed home39
- Owner-builder
- A qualifying owner may avoid the residential-builder license, but not county land-use or permit requirements10
- Minimum lot size
- Varies by district and development type; Type III development has a one-acre minimum11
- Septic soils
- Only 10.3% of soils lack severe limitations for a conventional drain field12
Who to call
Building permits
Harrison County Code Administration
Building permits needed in unincorporated Harrison County
15309 Community Road, Gulfport, MS 39503
Codes & inspections
Harrison County Code Administration — Permit Procedures and Fees
Published mobile-home permit fees and health-department acceptance documentation
Zoning
Harrison County Office of Zoning
Administration, enforcement and appeals under the county zoning ordinance
12423 Seaway Rd.
Septic permits
Harrison County Health Department
County health contact for onsite wastewater application and acceptance documentation
Contact details are copied from each office’s official page and were checked against it on September 28, 2026.
Do you need a building permit in Harrison County, Mississippi?
Yes. Building permits needed within unincorporated Harrison County are handled by Harrison County Code Administration12. Harrison County also has an adopted building-code program administered by its Building Official, although the reviewed provision does not identify the code edition13. A qualifying property owner may supervise construction on the owner's property without a residential-builder license when the project is for the owner's use and not for sale, rent, public use or public assembly10. That exemption concerns contractor licensing, not county permitting10. The county's materials did not establish one universal requirement covering every possible construction type, so ask Code Administration whether the exact work—such as a house, addition, barn or utility installation—needs a permit before ordering plans or materials2.
Who is the Harrison County building department, and how do you reach it?
Harrison County Code Administration is the building-permit contact for unincorporated Harrison County at 15309 Community Road, Gulfport, MS 39503, telephone 228-832-16222. The office publishes hours of 8 am to 5 pm, Monday through Friday, and links to an online permit application portal2. Land-use questions go to the Harrison County Office of Zoning at 12423 Seaway Rd.; the office administers, enforces and hears appeals under the zoning ordinance9. Onsite wastewater questions go through the Harrison County Health Department at 1-855-220-0192 and the state application site14. For access from a county-maintained road, contact the Harrison County Road Department at 228-896-020115. The county does not publish a complete ordinary residential building-permit fee schedule on the verified pages, so request the current project-specific fee total from Code Administration before filing2.
Does Harrison County have zoning?
Yes. Harrison County's Unified Development Code establishes zoning districts with use regulations and dimensional standards37. The result is parcel-specific: lot size, setbacks, height and coverage depend on the zoning district and development type7. Type III development has a minimum lot size of one acre, but that figure is not a universal minimum for every parcel or home11. Building activity next to a waterway has a 15-foot setback from the bank, while other setbacks vary by district and use16. Building and land-use applications subject to coverage standards must include a lot-coverage worksheet17. A secondary living unit may be allowed as an accessory to a principal detached single-household dwelling in specified districts, but it requires a conditional-use permit18. Ask the Office of Zoning to identify the parcel's district before designing the site plan9.
How do septic permits work in Harrison County?
The Mississippi State Department of Health sets onsite wastewater policy and regulations, and the appropriate county health department performs local inspections8. Harrison County falls within that state-administered program, whose work includes design and inspection of individual onsite wastewater systems4. Harrison County Code Administration directs applicants to the Harrison County Health Department at 1-855-220-0192 or the state wastewater application site14. The county's permit instructions also refer to a final health-department certificate of acceptance, Form 91019. Septic feasibility warrants early attention because only 10.3% of Harrison County soils are rated without severe limitations for a conventional drain field12. That soil statistic does not decide whether a particular lot will pass; obtain the health department's site-specific evaluation before fixing the house location or committing to a conventional system4.
Can you live in an RV or tiny home on your land in Harrison County?
A recreational vehicle is not a residential dwelling and may not be used as a permanent place of abode in unincorporated Harrison County5. In an RV park, occupancy longer than six months in a 12-month period is presumed permanent, whether continuous or part time5. A narrow temporary-use route exists for qualifying hunting property larger than 160 acres and certain waterfront property subject to routine inundation, but placement in residential or agricultural districts requires a conditional-use permit6. Under that route, an RV may remain for no more than 17 continuous days and must be removed for four days before a new period begins6. Harrison County's reviewed materials do not resolve tiny-home occupancy countywide or establish a general minimum dwelling size; ask the Office of Zoning how the parcel's district and the proposed unit's construction classify it9.
Building a home in Harrison County: the steps, in order
First, ask the Office of Zoning to confirm the parcel's district, allowed residential use, setbacks and dimensional standards39. Second, apply through the Harrison County Health Department for onsite wastewater review if the site will not use centralized sewer414. Third, confirm flood status before earthwork: any development in a special flood hazard area requires a county development permit, and that permit has a $50 fee20. Fourth, confirm driveway jurisdiction; a single-family driveway to county right-of-way generally does not require a county Utility Permit unless the County Engineer requests one, while a new or altered driveway onto a state highway requires a state permit2122. Fifth, submit the project to Code Administration through the county permit portal and ask the office for the exact plans, trade permits, inspections and fees required for the design12. Finally, obtain every required approval before occupancy, including applicable code and health closeout documents2319.
What should you check before buying land in Harrison County?
Start with zoning, septic feasibility, flood exposure and legal road access because each can change where—or whether—the intended home fits342021. Only 10.3% of county soils are rated without severe limitations for a conventional drain field, so a favorable-looking parcel still needs site-specific wastewater review124. Harrison County is flat, with 100% of its land at a 15% slope or less, and 73.9% is wooded2425. Annual precipitation averages 65.5 inches, making drainage and wet-season site conditions practical due-diligence items26. The effective property-tax rate is about 0.6%, and the median property-tax bill is about $1,289 per year2728. Before closing, obtain the zoning district and applicable dimensional table from the Office of Zoning, the wastewater determination from the health department, and the access answer from the agency maintaining the road91415.
Watch-outs
- Permanent RV living is prohibited in unincorporated Harrison County; temporary use is limited to narrowly defined qualifying land and requires the stated county approvals56.
- A $50 county fee applies to development permits in a special flood hazard area, not to ordinary residential building permits generally20.
- Harrison County's verified pages do not publish a complete ordinary home-permit fee schedule or a countywide minimum dwelling size; ask Code Administration and the Office of Zoning for the parcel-specific answers29.
Sources
- A building permit (2026 county census)
- Harrison County Code Administration (harrisoncountyms.gov)
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- On-Site Wastewater, quoted and re-checked
- Harrison County Unified Development Code, quoted and re-checked
- Harrison County Unified Development Code, quoted and re-checked
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- Mississippi State Department of Health Current Regulations: On-site Wastewater (Mississippi statewide rule), quoted and re-checked
- Harrison County Office of Zoning (harrisoncountyms.gov)
- Residential Laws and Rules Revised 2022, quoted and re-checked
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- Harrison County Health Department (harrisoncountyms.gov)
- Harrison County Road Department (harrisoncountyms.gov)
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- Harrison County Code Administration — Permit Procedures and Fees (harrisoncountyms.gov)
- Harrison County Code Administration Development Permit Application and Instruction Sheet, quoted and re-checked
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- Mississippi Access Management Guide (Mississippi statewide rule), quoted and re-checked
- Harrison County, Mississippi Unified Development Code, quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
- Wooded share of land: Bolthole Index county data
- Annual precipitation: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 28, 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.