Building permits in Harrison County, Mississippi
Find the right authority before you build. Harrison County permitting follows Mississippi law — here is exactly who issues the permit and where to start.
County + cities (mixed)
Harrison County Code Administration (unincorporated areas); Gulfport and Biloxi issue within city limits
Harrison County issues residential building permits through Code Administration for areas outside city limits; the cities of Gulfport and Biloxi (and other municipalities) issue permits within their limits.
Open the official permit portal →
The county portal covers residential building permits outside Special Flood Hazard Areas; commercial permits and work inside SFHAs must be submitted in person.
Permit cheat-sheet (Mississippi rules)
| Project | Permit? | Authority | Typical fee | Timeline | Go / No-Go | Key notes |
|---|---|---|---|---|---|---|
| 🏠 Accessory Dwelling Unit (ADU) | Conditional | city | Where a jurisdiction enforces a code, fees follow that city/county schedule; many rural counties have no permit fee because no code is enforced. Verify locally. | Varies — only applies where your city/county has adopted a building code. | Case by case | Mississippi has no mandatory statewide building code. Whether an ADU needs a permit depends entirely on whether your city or county has adopted and enforces a residential code, plus local zoning. Confirm with your local building department. |
| 🪵 Deck / Porch | Conditional | city | Where enforced, fees follow the local schedule (e.g., Jackson scales with valuation). Verify locally. | Varies by jurisdiction. | Generally allowed | If your jurisdiction does not enforce a building code, no structural permit is required. The six coastal counties must enforce coastal wind/flood provisions. Exempt: Where a code is enforced (e.g., Jackson adopts the 2018 IRC), a freestanding deck not over 30 in above grade and under ~200 sq ft is typically exempt. |
| 🧱 Fence / Wall | Conditional | city | Where enforced, fencing may need a permit above a height limit; verify locally. | Varies by jurisdiction. | Generally allowed | Local zoning sets front-yard and height limits. Many rural counties have no fence-permit process. |
| 🛖 Shed / Outbuilding | Conditional | city | Where enforced, small detached sheds may be exempt; verify locally. | Varies by jurisdiction. | Generally allowed | If your jurisdiction does not enforce a building code, no permit is required. Confirm with your local building department. Exempt: Where a code is enforced (Jackson/IRC), one-story detached accessory buildings under 120 sq ft are typically exempt. |
| 🪜 Basement Finish | Conditional | city | Where enforced, a building permit fee applies; where not enforced, none. Verify locally. | Varies by jurisdiction. | Generally allowed | Basement finishing into habitable space requires permits (egress, framing, electrical, plumbing, mechanical) only where your city/county enforces a residential code. |
| 🚗 Garage / Carport | Conditional | city | Where enforced, attached garages (additions) are permitted; verify locally. | Varies by jurisdiction. | Generally allowed | An attached garage is an addition requiring a permit where a code is enforced. A small detached garage may be exempt. If your jurisdiction does not enforce a code, no permit is required. |
| ☀️ Rooftop Solar PV | Conditional | city | Where enforced, an electrical permit fee applies; verify locally. | Varies by jurisdiction. | Generally allowed | Rooftop solar PV requires an electrical permit where a code is enforced. Licensed electrical contractors perform the work. Confirm with your local building department. |
| 🌡️ HVAC Replacement | Conditional | city | Where enforced, a mechanical permit fee applies; verify locally. | Varies by jurisdiction. | Generally allowed | Furnace/AC/heat-pump replacement requires a mechanical permit where a code is enforced; electrical, HVAC and fuel-gas are licensed trades in Mississippi. Confirm locally. |
| 🍳 Kitchen Remodel | Conditional | city | Where enforced, a building permit plus trade permits apply; verify locally. | Varies by jurisdiction. | Generally allowed | Relocating plumbing/electrical or moving walls requires a permit where a code is enforced. Cosmetic-only work may be exempt. Confirm with your local building department. |
| 🛁 Bathroom Remodel | Conditional | city | Where enforced, a building permit plus trade permits apply; verify locally. | Varies by jurisdiction. | Generally allowed | Relocating plumbing/electrical or moving walls requires a permit where a code is enforced. Cosmetic-only updates may be exempt. Confirm locally. |
| 🏗️ Room Addition | Conditional | city | Where enforced, a building permit based on valuation applies; verify locally. | Varies by jurisdiction. | Case by case | Room additions require a full building permit and zoning approval where a code is enforced. Whether a permit is needed at all depends on local adoption. Confirm with your local building department. |
| 🪟 Window / Door Replacement | Conditional | city | Where enforced, a permit fee applies if enlarging the opening; in-kind swap often exempt. Verify locally. | Varies by jurisdiction. | Generally allowed | Enlarging or adding openings requires a permit where a code is enforced. Confirm locally. |
| 🏘️ Roof Replacement | Conditional | city | Where enforced, a roofing permit may apply; verify locally. | Varies by jurisdiction. | Generally allowed | Jackson requires roofing permits for structural work; purely cosmetic re-roofing may be exempt. Confirm with your local building department. |
| 🅿️ Driveway / Parking Pad | Conditional | city | No building permit for private flatwork where enforced; a right-of-way/curb cut may need a permit. Verify locally. | Varies by jurisdiction. | Generally allowed | A permit may be required for right-of-way/curb-cut work. Confirm with your local building department. |
| 🏊 Swimming Pool / Spa | Conditional | city | Where enforced, a building permit plus barrier fencing applies; verify locally. | Varies by jurisdiction. | Generally allowed | Pools need a permit and barrier fencing where a code is enforced. Confirm with your local building department. |
| 🧱 Retaining Wall | Conditional | city | Where enforced, a permit applies if over 4 ft; verify locally. | Varies by jurisdiction. | Generally allowed | Walls over 4 ft or supporting a surcharge require a permit. Confirm with your local building department. Exempt: Where a code is enforced (IRC), retaining walls not over 4 ft (bottom of footing to top) and not supporting a surcharge are exempt. |
| 💥 Demolition / Teardown | Permit required | city | Demolition permit fee set by the issuing authority; verify locally. | — | Generally allowed | A full teardown or major strip-out requires a demolition (building) permit. Municipalities require utility disconnects (electric, gas, water, sewer) and, for pre-1978 homes, an asbestos/lead-paint clearance before demolition. |
| 🚰 Septic System | Permit required | county | Septic permit fee set by the local environmental/health authority; engineered systems cost more. | — | Generally allowed | New or replacement onsite wastewater (septic) systems require a permit from the Mississippi State Department of Health Division of On-Site Wastewater; a soil/perc evaluation and engineered design are typically required. |
| 🔌 EV Charger | Conditional | city | Electrical permit; fee set by the issuing authority. | — | Generally allowed | A home EV charging station (240V branch circuit + wall-mounted EVSE) requires an electrical permit and must meet the NEC (Article 625). Many jurisdictions fast-track residential EVSE. |
| ⚡ Standby Generator | Conditional | city | Mechanical/electrical permit; fee set by the issuing authority. | — | Generally allowed | A permanently installed standby generator requires mechanical and electrical permits (transfer switch, fuel gas/propane line). Setback, carbon-monoxide ventilation, and noise rules apply. |
Frequently asked questions
Who issues building permits in Harrison County, Mississippi?
Harrison County Code Administration (unincorporated areas); Gulfport and Biloxi issue within city limits is the permitting authority for Harrison County. Permitting is split — cities issue for incorporated areas, the county for unincorporated areas. Start at the official portal linked above.
Do I go to the county or my city for a building permit in Harrison County?
Permitting is split — cities issue for incorporated areas, the county for unincorporated areas.
What home projects need a permit in Harrison County?
The same project types shown in the cheat-sheet above (ADU, deck, fence, shed, solar, and more) — rules follow Mississippi state law. Whether the county or your city issues it depends on your property's incorporation status.
How do I apply for a permit in Harrison County?
Use the official permit portal linked above. Most offices accept online submissions; have your plans, site information, and contractor details ready before applying.