Building permits, zoning and septic rules in Johnsonville, South Carolina

At a glance

Building permits

Required for buildings, structures and additions¹

Planning and zoning

Consolidated Johnsonville–Florence County arrangement²

Septic permits

SCDES approval required where public or community sewer does not serve the home; application fee $150⁴

Subdivision setbacks

Small family/private developments: front 20 feet, each side 10 feet, rear 15 feet; these are not universal city setbacks⁵

Owner-builder

State exemption for qualifying owner/family occupancy, with personal supervision and required notice⁶

Farm structures

Conditional building-code exemption; affidavit required and building-permit authority remains⁷

Who to call

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

Do you need a building permit in Johnsonville, SC?

Johnsonville requires a building permit before a building, structure or addition is erected, and the permit must be issued under the International Building Code.¹ Johnsonville also requires buildings, structures and additions to conform to that code.⁸ The city’s planning agreement consolidates building inspection functions with Florence County; the county’s current jurisdiction page lists Johnsonville under building services.²⁹ Ask the Florence County Planning Department for the application checklist, applicable code edition, building-permit fee and inspection schedule for your Johnsonville project.¹⁰

Who handles building permits and zoning in Johnsonville?

Johnsonville participates in consolidated planning, zoning and building inspection with Florence County, so the county department is a relevant contact for an address inside Johnsonville city limits.²⁹ Call the Florence County Planning Department at (843) 676-8600 and identify the property as a Johnsonville project.¹⁰ Johnsonville City Hall is reachable at 843.386.2069 for municipal routing questions.¹¹ Building and zoning administration does not transfer septic approval to City Hall or the county building counter: SCDES remains the septic authority for Johnsonville.³

Does Johnsonville have zoning, and what setbacks apply?

Johnsonville has planning and zoning through the consolidated arrangement with Florence County.² For small family and private developments of one to four lots inside Johnsonville, the land-development rules specify minimum setbacks of 20 feet in front, 10 feet on each side and 15 feet at the rear.⁵ Each lot in that category may contain only one single-family residence.⁵ Those measurements apply to that development category; ask the consolidated planning office to identify the parcel’s applicable district, permitted use and dimensional requirements before laying out a home.⁵¹⁰ We could not confirm a complete Johnsonville district schedule, minimum dwelling size, or RV and tiny-home occupancy rules; ask that office about the proposed use.²¹⁰

How do septic permits work inside Johnsonville?

A Johnsonville home or manufactured home on property without public or community sewer needs SCDES approval and a permit to install a septic system before installation.⁴ South Carolina does not allow an onsite wastewater permit where public sewer is accessible, so establish sewer availability before applying.¹² The septic application fee is $150; the traditional permitting route includes a site visit and suitability evaluation.⁴ A permit to construct is valid for 5 years, with a new application and fee required for renewal or modification.⁴ The installer must arrange the SCDES installation inspection before covering the system.¹³ Contact the SCDES Florence regional office at (843) 661-4825 for local septic questions.¹⁴

What are the steps to build a home in Johnsonville?

1. Ask the consolidated planning office to confirm Johnsonville jurisdiction, the proposed use and any subdivision approval needed for the lot.²¹⁵
2. Establish public sewer accessibility; if sewer is unavailable, obtain SCDES septic approval before seeking the building permit.¹²⁴
3. Obtain the Johnsonville building permit before erecting the home and ask the building office for the project’s inspection schedule.¹¹⁰
4. If acting as your own builder, personally sign the building-permit application, supervise the work and file the required public notice with the register of deeds; South Carolina’s exemption is for qualifying owner or family occupancy and requires compliance with building codes and zoning.⁶
5. Have the septic installer arrange inspection before the system is covered.¹³

What should you check before buying land in Johnsonville?

Johnsonville’s subdivision rules allow individual wells or septic systems only when the subdivision is technically infeasible ever to serve with public water and sewer, and require written environmental-agency approval before plat approval.¹⁶ That subdivision condition matters alongside the state rule barring septic permits where public sewer is accessible.¹²¹⁶ For a private residential well, South Carolina requires a Notice of Intent for general-permit coverage before construction; the permit does not override local prohibitions.¹⁷ For land outside Johnsonville city limits, use the Florence County guide for the county’s unincorporated-area building and zoning answers.¹⁸¹⁹ Ask the consolidated planning office about floodplain review and road access for the actual parcel before committing to a site plan.¹⁰

Watch-outs

• We could not confirm Johnsonville’s RV, temporary-camping or tiny-home occupancy rules; ask the consolidated planning office before relying on any of those uses.¹⁰
• South Carolina’s farm-structure building-code exemption excludes residences and attached structures, requires a preconstruction affidavit, and leaves building-permit authority intact.⁷
• South Carolina’s 2024 building codes take effect January 1, 2027; ask the building office which code applies to your application date.²⁰¹⁰

Sources

1. Johnsonville Code, Sec. 6-20. Building permits (Johnsonville), quoted and re-checked
2. Johnsonville Code, Appendix A, Exhibit A (Johnsonville), quoted and re-checked
3. SCDES: Septic Tanks - Who to Call (Johnsonville), quoted and re-checked
4. SCDES: Septic Tanks - Residential, Single Home Builder (Johnsonville), quoted and re-checked
5. Johnsonville Code, Appendix B, Sec. 6.3. Lots (Johnsonville), quoted and re-checked
6. South Carolina Code Title 40, Chapter 59 — Residential Home Builders (South Carolina statewide rule), quoted and re-checked
7. South Carolina Code Title 6, Chapter 9 — Building Codes (South Carolina statewide rule), quoted and re-checked
8. Johnsonville Code, Sec. 6-19. Generally (Johnsonville), quoted and re-checked
9. Florence County Planning — Consolidated Jurisdictions (florencecountysc.gov)
10. Florence County Planning Department (florencecountysc.gov)
11. Johnsonville City Hall (cityofjohnsonville.com)
12. Professional Soil Classifiers - Sewer Accessibility Verification (South Carolina statewide rule), quoted and re-checked
13. SCDES: Septic Tanks - Residential, Single Home Builder (Johnsonville), quoted and re-checked
14. SCDES Florence Regional Onsite Wastewater Office (des.sc.gov)
15. Johnsonville Code, Appendix B, Sec. 6.3. Lots (Johnsonville), quoted and re-checked
16. Johnsonville Code, Appendix B, Sec. 6.19. Florence County Water/Sewer System Extension Procedures (Johnsonville), quoted and re-checked
17. Private Drinking Water Wells (South Carolina statewide rule), quoted and re-checked
18. Florence County SC - Inspections, quoted and re-checked
19. Florence County Planning, quoted and re-checked
20. 2024 Building Code Modification Index (South Carolina 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.