Bolthole Index

Marion County, South Carolina

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

Mullins, South Carolina requires a building permit for most work and improvements, with exceptions for some interior finish work.1 Inside Mullins city limits, city zoning applies and RV lodging in residential districts is limited to 7 days.23 For a home without public or community sewer service, septic approval comes from the South Carolina Department of Environmental Services (SCDES).4

At a glance

Building permits
Required for most work and improvements; some interior finish work is excluded.1
Zoning
City zoning applies inside Mullins city limits.2
Septic permits
SCDES approval is required for a home not served by public or community sewer.5
RV living
Temporary lodging only, up to 7 days in residential districts.3
Owner-builder
Conditional state exemption for personal or family occupancy; building codes and zoning still apply.6
Private wells
Notice of Intent for General Permit coverage required before construction.7

Who to call

Building permits

City of Mullins Department of Building Safety

City building permit applications and planning and zoning forms.

(843) 464-9583

151 East Front Street Mullins, SC 29574

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 Mullins means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Mullins, SC?

Mullins requires a building permit for most work and improvements, excluding some interior remodeling such as painting, tiling, carpeting, cabinets and counter tops.1 The City of Mullins Department of Building Safety provides the building permit application and separate trades, fence and solar application forms.1 Ask that department which applications cover your proposed home, addition or renovation before starting work.

South Carolina makes local jurisdictions responsible for administrative building-code procedures and permitting fees; we could not confirm a Mullins fee schedule, so request the current fees from the city department.89

Does Mullins have zoning, and what should you check?

Mullins has its own zoning ordinance, official zoning map, Planning Commission and Zoning Board of Appeals for land inside city limits.2 The city building department publishes a zoning map and Certificate of Zoning Compliance form.1 Ask the city department to identify the parcel’s district and confirm the proposed dwelling use, lot size, setbacks and minimum home size before buying.

Mullins requires a significant-tree survey before grading or clearing for development covered by its tree-protection section, and Zoning Administrator site-plan approval is a prerequisite to a building permit for that process.10 Ask the Zoning Administrator whether the tree-protection exception for individually owned smaller lots applies to your parcel.10

Can you live in an RV or tiny home in Mullins?

In Mullins residential districts, recreational vehicles may be used for temporary lodging for up to 7 days.3 That limit makes an RV a poor assumption for housing throughout a home-building project; ask the city Department of Building Safety about your proposed construction-period accommodation before committing to the land.3

We could not confirm a Mullins tiny-home occupancy rule or an accessory-dwelling allowance; ask the city zoning staff to review the exact dwelling design and proposed use. Mullins zoning applies inside city limits, so the RV lodging provision alone does not establish permission for a tiny home.23

How do septic permits and private wells work in Mullins?

For a Mullins home not served by public or community sewer, SCDES approval and a septic installation permit are required first.5 SCDES cannot issue an onsite wastewater permit where public sewer is accessible, so establish sewer availability before planning a septic system.11 The SCDES Onsite Wastewater Program evaluates site suitability, and the installer must schedule a final inspection before covering the system.12

Marion County’s soils have only 0.6% rated not limited for conventional septic drain fields; that countywide figure supports a site evaluation, not a conclusion that septic is impossible on a Mullins lot.13 A private residential well requires a Notice of Intent for General Permit coverage before construction, and that permit does not override local prohibitions.7

Building a home in Mullins: what are the steps?

Start with these checks before clearing or construction:

  1. Ask Mullins zoning staff to identify the district and review the proposed home against city zoning.2
  2. Confirm sewer accessibility; if sewer is unavailable, obtain SCDES approval and a septic installation permit.115
  3. Resolve any applicable tree survey and site-plan review with the Mullins Zoning Administrator before grading or clearing.10
  4. Request the city building application and confirm required construction documents and fees with the Department of Building Safety.19

An owner-builder in Mullins may qualify for South Carolina’s personal-or-family-occupancy exemption, but must personally sign the building application, supervise construction, comply with codes and zoning, and file the required public notice with the register of deeds.6

What should you check before buying land in Mullins?

Confirm whether the property is inside Mullins city limits before choosing a building or zoning counter: Mullins has municipal zoning, while Marion County’s zoning ordinance applies to unincorporated land.214 For property outside the city, use the Marion County guide for the county’s building and zoning answers.

Ask the city Department of Building Safety to confirm parcel-specific floodplain requirements, tiny-home treatment and residential dimensional standards; we could not confirm those answers for a particular Mullins lot. South Carolina’s mandatory code update is scheduled for implementation in January 2027, so a project crossing that date should confirm the applicable code edition with the city department.15

Watch-outs

  • Mullins residential-district RV lodging is limited to 7 days; do not assume an RV can house you throughout construction.3
  • Public sewer accessibility prevents SCDES from issuing an onsite wastewater permit.11
  • South Carolina’s farm-structure exemption excludes residences and does not remove local authority to issue building permits.16

Sources

  1. City of Mullins Department of Building Safety (mullinssc.us)
  2. Mullins Code of Ordinances, Appendix A—Zoning, Sec. 12.01—Definitions (Mullins), quoted and re-checked
  3. Mullins Code of Ordinances, Appendix A—Zoning, Sec. 6.4 (Mullins), quoted and re-checked
  4. Septic Tanks - Residential, Single Home Builder (South Carolina statewide rule), quoted and re-checked
  5. Septic Tanks - Residential, Single Home Builder (South Carolina statewide rule), quoted and re-checked
  6. South Carolina Code Title 40, Chapter 59 — Residential Home Builders (South Carolina statewide rule), quoted and re-checked
  7. Private Drinking Water Wells (South Carolina statewide rule), quoted and re-checked
  8. Building Codes in Effect for South Carolina (South Carolina statewide rule), quoted and re-checked
  9. Building Codes Council Frequently Asked Questions (South Carolina statewide rule), quoted and re-checked
  10. Mullins Code of Ordinances, Appendix A—Zoning, Sec. 4.3—Tree protection (Mullins), quoted and re-checked
  11. Professional Soil Classifiers - Sewer Accessibility Verification (South Carolina statewide rule), quoted and re-checked
  12. South Carolina Department of Environmental Services Onsite Wastewater Program (des.sc.gov)
  13. 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
  14. Marion County Zoning Ordinance (2026 county census)
  15. 2024 Building Code Modification Index (South Carolina statewide rule), quoted and re-checked
  16. South Carolina Code of Laws, Section 6-9-65 (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.

Answers from the rulebook for Mullins

Mullins’s own rules

  • Local zoningPresent (with conditions)

    Land within Mullins city limits.

    • Zoning is administered through the City of Mullins zoning ordinance, official zoning map, Planning Commission, and Zoning Board of Appeals.
    “The word "map" or "zoning map" shall mean the Official Zoning Map of the City of Mullins, South Carolina. The term "Planning Commission" refers to the Planning Commission for the City of Mullins.”
  • Living in an RVTemporary only (with conditions)

    Recreational vehicles in residential districts inside Mullins city limits.

    • Temporary lodging is limited to seven days.
    • Not more than one recreational vehicle or boat may be parked or stored in a required front or side-yard setback area or within five feet of the rear lot line.
    • Loading or unloading parking may occur anywhere on a residential premise for no more than 24 hours.

    temporary lodging duration: <= 7 days

    “Recreational vehicles may be used for temporary lodging, up to seven (7) days.”
  • Building in a floodplainLimited

    New construction and substantial improvements in coastal high hazard areas within Mullins city limits.

    • The rule applies only within coastal high hazard areas located within the designated areas of special flood hazard.
    • New construction and substantial improvements must be landward of mean high tide and the first line of stable natural vegetation and must comply with applicable DHEC OCRM setback requirements.
    • Additional elevation, anchoring, fill, enclosure, manufactured-home, recreational-vehicle, and equipment provisions apply under Sec. 15.32.410.
    “All new construction and substantial improvements shall be located landward of the reach of mean high tide, first line of stable natural vegetation and comply with all applicable department of heath and environmental control (DHEC) ocean and coastal resource management (OCRM) setback requirements.”
  • Permit processPartial

    Development involving significant-tree review inside Mullins city limits.

    • Before grading or clearing for development and issuance of a building permit, the applicant must conduct a tree survey.
    • The design must be shown on a site plan, and Zoning Administrator site-plan approval is prerequisite to issuance of a building permit.
    • Individually owned lots under two acres are excepted from the tree-protection section.
    “Prior to grading or clearing a lot or parcel for development and the issuance of a building permit, the developer/owner applicant shall have conducted a tree survey identifying the location of all significant trees.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Mullins or Marion County directly.

  • Building permit — Residential construction inside Mullins city limits.
  • Owner-builder exemption — Owner-built residential construction inside Mullins city limits.
  • Building code adopted — Construction inside Mullins city limits.
  • Inspections — Buildings inside Mullins city limits.
  • Certificate of occupancy — Buildings inside Mullins city limits.
15 more unanswered
  • Minimum dwelling size
  • Lot coverage
  • Building height
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Short-term rentals
  • Permit fees

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 Mullins publishes no rule on the point, not that none exists. Marion County’s page lists the county offices to call.

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