South Carolina Plumbing Inspection Requirements

How Plumbing Inspections Work in South Carolina

Every plumbing installation, alteration, or repair that requires a trade permit must pass a series of inspections before the local Authority Having Jurisdiction (AHJ) will close the permit. South Carolina follows the International Plumbing Code (IPC) with state-specific amendments, and local building departments enforce the inspection sequence at the municipal level.

The state license gets you legal authority to contract and pull permits. The inspections are where the local building department verifies that your actual work meets code. Skipping or failing to schedule required inspections doesn't just delay the project — it can trigger stop-work orders, double permit fees, and formal complaints to the LLR that put your license at risk.

The Standard Inspection Sequence

While exact requirements vary by municipality, South Carolina building departments generally enforce four mandatory inspection phases for new plumbing installations:

Under-Slab Inspection: This happens after you install all below-grade plumbing but before any concrete is poured. Every pipe, fitting, and connection under the building footprint must be fully exposed for visual verification. The inspector checks pipe material, slope, cleanout placement, and compliance with the IPC drain-waste-vent (DWV) specifications. You cannot pour the slab until this inspection passes — concrete placed over uninspected plumbing forces a destructive re-opening at the contractor's expense.

Sewer and Water Lateral Inspection: Water supply and sewer lateral lines running from the building foundation to the municipal connection must remain fully uncovered and exposed until the inspector signs off. Backfilling before inspection is a common mistake that triggers an immediate failed inspection and a requirement to re-excavate.

Rough-In Inspection: Conducted after framing is complete and all in-wall plumbing is installed, but before drywall goes up. This is typically the most detailed inspection. The inspector verifies the entire DWV system using a hydrostatic pressure test or air test per IPC Section 312. All supply lines, waste lines, vent stacks, and fixture connections must be accessible and pressurized during the inspection window.

The pressure test is pass/fail — the system must hold the specified pressure for the required duration without any drop. A single leaking joint or improper fitting fails the entire rough-in, and the inspector won't return until you've made repairs and rescheduled.

Final Inspection: Performed after all fixtures, water heaters, backflow prevention devices, and trim work are installed and operational. The inspector checks fixture connections, hot/cold orientation, trap seals, water heater installation (including T&P relief valve discharge), and backflow device test tags. Every trade inspection must close before the building official will issue a Certificate of Occupancy or Certificate of Completion for the project.

Re-Inspection Fees and Policies

Failing an inspection triggers re-inspection requirements that vary by jurisdiction:

Richland County (Columbia area): The first re-inspection for a failed inspection carries no additional fee. A second failure on the same inspection request results in a $30 charge, and each subsequent failure costs $50. These fees add up quickly on complex commercial projects with multiple inspection points.

Charleston County: Re-inspection fees are $100 per failed trip. Unlike Richland County, there's no free first re-inspection — every failed inspection costs money from the first callback.

Greenville County: A permit can become invalid if work does not commence or an inspection is not requested within six months of issuance. Confirm Greenville County's current re-permitting steps if that occurs.

The financial penalty for failed inspections is designed to be steep enough that contractors prepare properly before calling for inspection, rather than using the inspector as a quality check.

What Triggers a Failed Inspection

The most common reasons plumbing inspections fail in South Carolina:

• Pressure test failure — any measurable pressure drop during the rough-in test fails the entire system. Common causes include improperly solvent-welded joints, cracked fittings from over-tightening, and missed test caps on open lines
• Incorrect slope — DWV drain lines must maintain the slope required by the adopted IPC. Sagging horizontal runs or insufficient slope at connections are caught with a level during the under-slab and rough-in inspections
• Missing cleanouts — the IPC requires cleanout access at specific intervals and direction changes. A missing cleanout means cutting into a finished wall or slab later, so inspectors flag these early
• Work concealed before inspection — pouring concrete before slab inspection, hanging drywall before rough-in, or backfilling before lateral inspection all result in an automatic failure and a requirement to expose the work

Scheduling and Permit Card Requirements

Before performing any work, the trade permit card must be posted in a conspicuous, weather-protected location on the job site. Most jurisdictions require the permit card to remain visible throughout the project until the final inspection closes.

Inspections are scheduled through the local building department's system — many South Carolina jurisdictions use the eTrakit online portal for both permit applications and inspection scheduling. Charleston, Columbia, and Greenville each have their own portals and scheduling procedures.

The South Carolina Plumber License Guide includes the complete inspection sequence for the three major metro areas, along with the specific forms and portal registration steps you need to pull your first permit.

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