How to Get a Plumbing License in South Carolina (2026 Guide)

South Carolina does not issue one plumbing license. To get licensed, you pick between two separate credentials from two different boards: the Residential Plumber License (RBP) from the Residential Builders Commission, for residential plumbing over $500, or the Mechanical Contractor license with the Plumbing (PB) classification from the Contractor's Licensing Board, for mechanical work over $10,000.

At a glance

• Residential (RBP): licenses the individual for residential plumbing over $500, through the Residential Builders Commission
• Commercial (PB): licenses the business entity for mechanical construction over $10,000, through the Contractor's Licensing Board
• Experience: 1 year of residential plumbing in the past 5 years; 2 years of full time, primarily commercial work in the past 5 years for the qualifying party
• Exams (PSI): Residential Plumbing (65 questions) or Plumber (80 questions), plus a Business Management and Law exam
• Government fees: $135 application and $220 license for the RBP; $350 license fee for the mechanical license

Both boards sit inside the South Carolina Department of Labor, Licensing and Regulation (LLR), but they do not share credentials, experience rules, exams, or surety bonds. For the general contractor side of the state, see the South Carolina contractor license guide; for the national picture, see the contractor license overview. This guide walks the full 2026 path for plumbing specifically: who needs which license, the experience and exam requirements, every government fee, the bond, how to apply, and the qualifying party rule that decides whether a business can hold the commercial license at all. Every figure here was checked against the board pages, the statute, and the PSI bulletins on October 7, 2026.

Who needs a South Carolina plumbing license

Which license you need turns on two things: whether the job is residential or commercial, and how much it costs. Get that wrong and you either buy the wrong credential or work illegally on jobs you thought you were covered for.

The two dollar thresholds most guides still publish incorrectly

You will see, on page after page, that South Carolina requires a residential plumbing license above $200 and a commercial license above $5,000. Both numbers are wrong.

• Residential plumbing work exceeding $500 requires a license. That is the figure the Residential Builders Commission publishes on its Residential Plumber License page, and it matches the definition of a residential specialty contractor at S.C. Code section 40-59-20(7), which applies "when the undertakings exceed five hundred dollars."
• Commercial mechanical contracting above $10,000 requires a license. S.C. Code section 40-11-30 sets the threshold, and it has been $10,000 since 2023 Act No. 69, effective May 19, 2023, which raised it from $5,000 for both general and mechanical contracting.

Both thresholds count the total cost of construction, labor and materials together, not your margin, and section 40-11-300 makes it unlawful to split a project into pieces to duck the number.

The two South Carolina plumbing licenses, side by side

Notes:

• The residential credential is issued by the Residential Builders Commission (RBC); the commercial credential is issued by the Contractor's Licensing Board (CLB). Both sit inside LLR.
• The commercial bond is sized to the license group: an amount equal to the group's required net worth, or a financial statement instead. See the license groups table below.
• Renewal fees are $220 for the RBP and $135 for the mechanical license; late fees and reinstatement differ by path and are covered in each section below.

The two agencies, and how to tell which one you need

Residential Builders Commission (RBC) licenses the individual who performs residential plumbing. The credential is the Residential Plumber License, code RBP. The Commission's fee table calls it the "Residential Specialty Plumbing License (RBP)" and the paper form is the "Application for Residential Specialty Contractor Plumbing License by Examination." Same license, two names.

Contractor's Licensing Board (CLB) licenses the business entity that performs commercial construction. The credential is a Mechanical Contractor license with the Plumbing (PB) subclassification.

The distinction that trips people up: under section 40-59-20(7), plumbers, electricians, and heating and air conditioning installers are residential specialty contractors who "must be issued specialty contractor licenses after passing the required examination." The other specialty trades the statute lists, vinyl and aluminum siding, masonry, drywall, carpentry, stucco, painting and wallpapering, and solar panel installation, receive specialty contractor registrations (code RBS, $100) with no examination at all. A plumber holds a license, never a registration, and nobody can plumb houses in South Carolina on a registration.

Path one: the Residential Plumber License (RBP)

This is the license for plumbing work on residential structures (sixteen units or less, no more than three stories, per the PSI bulletin) where the job exceeds $500.

Experience

You must show a minimum of one year of residential plumbing experience performed within the past five years. The Commission verifies it through a Residential Plumber Experience Affidavit from each supervisor or employer, backed by copies of W-2s and/or 1099s. The signer must have been appropriately licensed while supervising you: a licensed residential plumber, a residential builder, or a mechanical contractor with the plumbing classification.

The affidavit (Rev. 12/2025) asks your supervisor to check off the work you actually performed, estimating and plan review, water supply systems, fixture installation, drain, waste and vent systems, water heaters, gas piping, and service call work, with roughly how many projects for each, and to say under penalty of perjury whether you can independently perform full scope plumbing work on an entire home. The year can come from any state or country; a college degree does not waive it.

Exams

PSI Services LLC administers the Commission's exams through its own residential testing portal. The commercial board uses a separate, non-interchangeable PSI portal, covered in the Path two exam section below.

You must pass both portions.

Both are open book. Work experience must be verified and approved before you are made eligible to test; you cannot test first and document later. Once approved, your eligibility is valid for one year and you get three attempts within that twelve month period. If you fail three times, you must wait twelve months from the last failure before testing again, under section 40-59-220(E).

Exam waiver

The technical portion can be waived, the Business Management and Law exam and the experience requirement still apply, if you meet one of three conditions:

• You are a currently licensed SC Mechanical Contractor with the Plumbing (PB) classification, in good standing, active a year or longer, and obtained by examination.
• You hold a current license in an eligible state, obtained by examination, for a year or longer. For the residential plumber license the eligible states are Mississippi and North Carolina only. Grandfathered licensees do not qualify.
• You hold a current Master Residential Plumber or Master Plumber Certification issued by examination.

That last one carries a 2026 change almost nobody has published yet, covered below.

Fees

Fees change; verify current amounts with LLR before you send money. Exam fees are paid directly to PSI.

The requirements nobody mentions

Three residential requirements are absent from most guides, and all three sink applications.

A credit report. Citing section 40-59-250, the Commission's application instructions (Rev. 01/2026) require a copy of your credit report dated no more than 30 days before the application date. TransUnion, Equifax, or Experian are accepted. Staff review it for liens and outstanding judgments, and the statute requires you to list any judgments from the past five years on the application and at every renewal.

A conditional $10,000 bond, in your own name. If you will perform work exceeding $5,000 total cost of construction (labor and materials) on a project, a $10,000 surety bond must be on file with the Commission before you perform or offer to perform that work (section 40-59-240(D)). It does not go in with your application, but it must be on file first.

Critically, the bond must list the individual as principal; it cannot be in a company or business name. Handwritten bonds and bonds signed via DocuSign are not accepted. Once a current bond is on file there is no contract limit on your projects.

A one year application clock. Your application is good for one year from the date of receipt. Miss that, and you start over, application fee included. Staff review packets within 15 business days.

Residential renewal

The license renews every two years, before June 30 of each odd numbered year. Renewals after June 30 carry the $50 late fee, a lapse under three years is reinstated for $480, and a license inactive for more than three years means a new application and a new exam under section 40-59-230(A). Neither board lists a continuing education requirement for these licenses; section 40-59-230(B) lets the Commission add one by regulation, and it has not.

Path two: Mechanical Contractor with the Plumbing (PB) classification

This is the commercial license, held by the business entity, for mechanical construction above $10,000.

South Carolina defines "mechanical construction" broadly at section 40-11-20(17): plumbing, heating, air conditioning, process piping, refrigeration, lightning protection, and electrical components, excluding burglar alarm work. Plumbing is one of eight mechanical subclassifications with technical exams.

The Plumbing (PB) scope at section 40-11-410(5)(f) covers installation, replacement, alteration and repair of all plumbing, including solar water heating, within property lines; piping, fixtures and appliances for water supply including pressure vessels and tanks; venting and sanitary drainage; roof leaders; water conditioning equipment; swimming pool piping and equipment; and the gas lines necessary if that equipment is gas fired. One useful boundary: plumbing contractors in license groups three, four, and five may install standpipe systems, including water hose connections and cabinets, without a separate fire sprinkler license, provided the hoses do not supply automatic sprinklers.

What the entity must do

To qualify for licensure under section 40-11-240, the entity must be a recognized business form organized in South Carolina or registered here, and must have a certified qualifying party in a responsible management position. Then it submits:

• Doc 165, the General and Mechanical Contractor application
• The $350 license fee
• Secretary of State verification (not required for a sole proprietorship), Articles of Incorporation or Organization, and documentation of ownership percentages
• A financial statement or surety bond establishing the license group
• Doc 168 (initial) or Doc 181 (transfer or revision) for each qualifying party, plus the Doc 190 company acknowledgement
• PSI pass sheets for the Plumber technical exam and the S.C. Business Management and Law for Commercial Contractors exam

License groups, mechanical contractor

Your bid and job ceiling is set by your financials, not your skill. For mechanical contractors, per section 40-11-260(B) and the board's licensure page:

You meet either the net worth or the working capital figure, not both. And note what changed: under section 40-11-262 as amended by 2023 Act No. 69, a surety bond submitted in lieu of a financial statement is now the same amount as the required net worth. It used to be two times the net worth. Any guide still doubling those numbers is three years out of date.

Groups 3 and 4 need a CPA compiled statement on initial application but may use an owner prepared statement at renewal; Group 5 needs a CPA audited balance sheet initially and a CPA reviewed statement at renewal. And a surety bond made payable to the South Carolina Residential Builders Commission will not be accepted by the Contractor's Licensing Board. They are different obligees.

Commercial exams and reciprocity

The qualifying party, not the company, sits for the exams. Section 40-11-230(A) governs.

Both are open book. Section 40-11-230(A) limits a technical exam to two attempts in a twelve month period and thereafter once every six months; the PSI bulletin adds that the Business Management and Law for Commercial Contractors exam may be taken on an unlimited basis over a twelve month period.

Reciprocity for the Plumbing classification is narrow. The board's Technical Exam Waiver Agreement list (revised May 2026) waives the Plumber exam for a license in good standing earned by examination in North Carolina (Plumbing, Class 1), Ohio (Plumbing) or Tennessee (CMC/Mechanical or CMC-A), plus a CAGC or MASC Master Plumber certification earned by exam after January 1, 1990. Licenses obtained by waiver or grandfathering do not qualify, and everyone still takes the South Carolina Business Management and Law exam.

Renewal dates and late fees

Commercial renewal dates are frequently misreported as June 30. They are not.

• General Contractor licenses expire October 31 in even numbered years.
• Mechanical Contractor licenses expire October 31 in odd numbered years. The current cycle runs 2025 to 2027, so the next expiration is October 31, 2027.

Licenses renew biennially for $135. Under section 40-11-250(B), a lapsed license can be renewed within 90 days of expiration with a late fee, and that renewal is retroactive to the expiration date.

The board's late fee ladder: November 1 to 30, $100 late fee ($235 total); December 1 to 31, $150 ($285 total); January 1 to 31, $200 ($335 total). Past 90 days you apply as a new applicant, and reinstatement costs $350. Continuing to work on a lapsed license is practicing without a license. A financial statement or bond is due at every renewal.

How to apply: step by step

1. Pick the path. Residential work over $500 means the RBP through the Residential Builders Commission; commercial mechanical work over $10,000 means the entity license through the Contractor's Licensing Board.
2. Bank the experience. One year of residential plumbing in the past five under a licensed supervisor, or, for the commercial qualifying party, two years of full time, primarily commercial work in the past five. Keep every W-2 and 1099.
3. Assemble the residential packet. Credit report dated within 30 days, the $135 fee, and the Experience Affidavit from each supervisor. Staff review within 15 business days and issue an Examination Eligibility letter.
4. Pass the PSI exams. Residential: both portions ($94) within twelve months, three attempts maximum. Commercial: the Plumber exam and the Business Management and Law for Commercial Contractors exam ($75 each), or qualify by waiver or certification.
5. Finish the residential license. Send the Commission your PSI score report and the $220 license fee; put the $10,000 bond on file in your own name before any project over $5,000; get a Certificate of Authorization ($100) if you work through a company you own less than 51 percent of.
6. Finish the commercial license. Form or register the entity with the Secretary of State, choose a license group and produce its financial statement or surety bond, and submit Doc 165, Doc 168 with Doc 167 work experience affidavits, Doc 190 and the $350 fee.
7. Check local licensing in each city or county you will work in.
8. Calendar renewal. June 30 of odd numbered years for the RBP; October 31 of odd numbered years, with a fresh financial statement or bond, for the mechanical license.

Timeline: how long this takes

The binding constraints are experience and exam scheduling, not paperwork. Residential: one year of documented experience, verified before you can test, then up to twelve months to pass both exam portions, plus the Commission's 15 business day packet review. Commercial: two years of qualifying experience for the primary qualifying party, then the technical and business law exams, then entity formation, the financial statement or bond, and the board's review of Doc 165 and Doc 168.

There is no official single-number processing time for either board beyond the 15 business day residential packet review, so once your experience is documented and your exams are passed, the remaining variable is how quickly you assemble the entity paperwork, the bond, or the financial statement.

Want the application done for you?

Between the Experience Affidavit, the credit report, the PSI score reports, the bond paperwork, and, on the commercial side, the Secretary of State filings, Doc 165, Doc 168, and a CPA statement or surety bond sized to your license group, this is a lot of paperwork to manage correctly while you are still running jobs.

The Licensing Company's License Application Processing service prepares and submits the state contractor license application for you: an eligibility audit before anything is filed, a document checklist so you are not chasing pieces alone, every state form prepared and reviewed line by line, submission the way LLR requires, and the board's follow-up questions answered and resubmitted until the board decides.

It is a flat $999 per state application, paid up front. State fees, exam fees, background checks, and fingerprinting are paid to the state, not to us. We do not promise approval, which only LLR's boards can decide, we do not promise a timeline, and we do not sit the PSI exams for anyone. Call 615-219-2110 to talk through which license you need.

If you are a business that needs the commercial license but does not yet have a certified plumber in management, that is a different problem than paperwork, covered in the qualifying party section below.

The 2026 change: MASC trade certification moved to Carolinas AGC

Since 1965 the Municipal Association of South Carolina (MASC) ran the SC Mechanical Trades Certification Program, and a MASC Master Plumber Certification was an accepted route to qualifying party certification and to a residential exam waiver. Effective January 1, 2026, Carolinas AGC (CAGC), through the CAGC Foundation, assumed full management of the program. MASC cards remain valid until the expiration date printed on the card.

What LLR accepts now, per the Contractor's Licensing Board and Doc 168:

• A current Master Plumber Certification issued by examination between December 1990 and December 2025 by MASC, or issued after January 1, 2026 by CAGC, corresponding to the Plumbing classification.
• For residential, a Master Residential Plumber or Master Plumber Certification on the same MASC through 2025, CAGC from 2026 split.

The CAGC certification process itself: a completed application, a $35 fee, up to two weeks to process, an exam notification from the vendor PROV, then scheduling and sitting the exam online or in person. A failed attempt can be retested by paying another $35, without reapplying. CAGC is explicit that this certification is not a license: it is a route to a licensing exam waiver or qualifying party documentation, not a substitute for the RBP or the mechanical license itself.

If you hold a MASC certification, you now contact CAGC for the certification verification letter LLR requires; guides still routing you to MASC are sending you to the wrong organization. Confirm program details with LLR and CAGC before relying on them.

One license that covers both markets

Section 40-59-270 exempts a mechanical contractor licensed under Chapter 11 from the residential specialty contractor chapter "when engaged in contracting in the classification in which he is licensed to perform mechanical contracting," so a company holding the Mechanical Contractor license with the Plumbing classification can take residential plumbing work under it. The reverse is not true: an RBP holder is capped at residential structures. A company that bids both a subdivision and a strip mall plans around the commercial license, and that comes with the qualifying party requirement below.

Local licensing still applies

A state license is not the last step. The Contractor's Licensing Board says plainly that cities and counties where you plan to work may require additional licensing and permitting, each with its own rules and fees, and section 40-59-240(C) says the same for residential specialty contractors. Call the city or county Business License or Building Permit department before you work there. One protection the statute gives you: a city or county may not make you sit a second technical exam once you have passed the Commission approved one.

What happens if you work unlicensed

Administrative penalties. Under section 40-11-100, LLR may issue citations and assess penalties against anyone including unlicensed contractors: up to $500 for a first violation of a provision, up to $1,000 for a second of the same or substantially similar provision within five years, and, for a third, referral to the board or another penalty at the $1,000 level. No more than $2,500 per day may be assessed against one entity or individual.

Criminal exposure. Under section 40-11-200, practicing in violation of the chapter, or knowingly submitting false information to obtain a license, is a misdemeanor punishable by up to one year imprisonment or a fine of up to $5,000. On the residential side, section 40-59-30(A) makes unlicensed specialty contracting a misdemeanor with a fine of not less than $500 or more than $10,000, or imprisonment of not less than thirty days, or both.

Board civil penalties. Separately, section 40-11-110(C) lets the board impose a civil penalty of up to $5,000 per violation.

And the one that actually hurts: you cannot sue to get paid. Section 40-11-370(C) states that an entity without a valid license "may not bring an action either at law or in equity to enforce the provisions of a contract." The same bar applies if you contracted under a name other than the exact name on your license, and section 40-59-30(B) adds that an unlicensed residential specialty contractor may not file a mechanics' lien either. That is a full payment bar, in the same family as the enforcement mechanisms we cover in contractor license law changes by state; an unlicensed plumber who completes a $180,000 job and does not get paid has no cause of action in a South Carolina court.

Alongside it, section 40-11-370(B) makes it unlawful to engage in construction, which expressly includes marketing, advertising, site signs and submitting contracts, under any name other than the exact name on the license. Vehicle advertising may use an abbreviated version so long as it is not misleading.

What changes for a business: the qualifying party rule

For the commercial license there is a second question, and it is the one that stops many plumbing companies: the entity cannot be licensed without a qualifying party in a responsible management position.

South Carolina calls that individual the Primary Qualifying Party (PQP). Under section 40-11-230(B), a PQP must hold a valid certificate, submit an affidavit verifying full time employment for at least two years within the previous five years in the classification, and document that they serve in a management capacity and are actively involved in management, supervision, and operations for the work the licensee undertakes. The statute goes further: the PQP "must be an integral party of the applicant's business," and "may not take other employment that would conflict with the duties as primary qualifying party or diminish the ability to adequately supervise work performed by the licensee." An owner or officer must personally attest to that on the application.

And when the PQP leaves, a clock starts. The licensee or the PQP must notify LLR in writing within 15 days. The license stays in good standing for 90 days from the date LLR receives that notice. If no replacement PQP is designated within those 90 days, LLR suspends the license.

Section 40-11-230(A) adds that an individual may serve as qualifying party for only one licensee, with a narrow exception for two entities at the same location where the person is involved in both daily, derives a livelihood from both, and owns at least 50 percent of one.

This is the qualifier angle that matters for a company owner. South Carolina builds the commercial plumbing license around a real person in a real management job: a full time W-2 employee who actually directs and supervises the plumbing work, with the pass sheets and two years of commercial experience to prove it. A qualifying agent qualifies the company, as an owner or as a full time W-2 employee who supervises the work; it is not a license for sale. If your company has the customers, the crews and the capital but not that person, hiring a qualifying agent is how companies solve it lawfully, and what a qualifying agent is explains the role generally. We break down the mechanics, including the one licensee rule and the two entity exception, in South Carolina's primary qualifying party rules.

If you are not yet eligible for your own RBP or PB credential but want to run a company now, a qualifying agent can qualify the company while you build toward your own license. That is a staffing solution, not a paperwork shortcut, and it is separate from the License Application Processing service described above.

Frequently asked questions

How much does it cost to get a plumbing license in South Carolina?

The government side costs are knowable. Residential: a $135 application fee, $94 to PSI for both exam portions, a $220 license fee, a credit report, and a $10,000 surety bond premium if you will take projects over $5,000. Commercial: $150 to PSI for the two exams, a $350 license fee, Secretary of State filings, and either a CPA prepared financial statement or a surety bond premium sized to your license group. The business side depends on your classifications, groups, states and financial position, and whether you have a certified individual already.

Do I need a plumbing license for small repairs in South Carolina?

Residential plumbing work exceeding $500 requires a license. Commercial mechanical work exceeding $10,000 requires a license. Below those thresholds the state chapters do not require the license, but local business licensing and permitting rules still apply, and the thresholds count the total cost of construction, labor and materials together, not your profit.

Does South Carolina have a journeyman plumber license?

Not at the state level. The state ladder runs Residential Plumber (RBC) and Mechanical Contractor with the Plumbing classification (CLB). Trade certification, including the Master Plumber card LLR accepts in place of the technical exam, now comes from CAGC, and some municipalities keep their own requirements, but there is no statewide journeyman license to pursue.

How long does it take to get licensed?

The binding constraints are experience and exam scheduling, not paperwork: one year of documented experience for residential, two years for commercial, verified before you test on the residential side. Once exams are passed and the packet is complete, the board's review is the remaining variable. See the Timeline section above for the full breakdown.

What is a licensed plumber in South Carolina, exactly?

It depends which license you mean. A licensed residential plumber holds the individual RBP credential and can perform residential plumbing over $500. A licensed commercial plumbing contractor is a business entity holding the Mechanical Contractor license with the Plumbing classification, qualified by a certified individual in management. Neither is a "master plumber" card; South Carolina does not issue one at the state level.

Can my company hold the license if I am not the licensed plumber?

On the commercial side, yes: the license belongs to the entity, and the certified individual serves as the qualifying party in a responsible management position, genuinely employed and genuinely in charge of the work. On the residential side, the license belongs to the individual. You may list your company on it only if you own at least 51 percent; otherwise the company must obtain a Certificate of Authorization, post the firm's $15,000 residential surety bond under section 40-59-410, and designate a resident licensee in responsible charge. If you need a qualified individual placed inside your business as a full time W-2 employee, that is exactly what we do; see hire a qualifying agent.

Where this leaves you

South Carolina is more forgiving than most states on experience, one year residential and two years commercial against the four to eight year ladders common elsewhere, and considerably less forgiving on structure. The dollar thresholds are low, the payment bar for unlicensed work is absolute, and the commercial license simply does not exist without a qualified individual sitting in management inside the business.

If you are a plumber, the path is short and worth walking. If you are a business that needs a commercial mechanical license without a certified plumber in management, the credential is a hiring problem before it is a paperwork problem. Marshall Schofield and Jeremiah Jaskulski built The Licensing Company around exactly that problem, placing qualifying agents inside contracting companies in South Carolina and across the country.

Call 615-219-2110 and tell us which license you need, which groups you plan to bid, and whether you already have a certified plumber in management. We will tell you plainly what is possible. Start with hire a qualifying agent if you need a qualifier, or License Application Processing if you are ready to file your own application.

More on that path: becoming a qualifying agent, the national plumbing contractor license overview, the South Carolina contractor licensing guide, the contractor license pillar, and all state guides.

Sources

All retrieved October 7, 2026.

• RBC, Residential Plumber License
• RBC, licensure and fee table
• RBC, application instructions (Rev. 01/2026)
• RBC, application package and Experience Affidavit (Rev. 12/2025)
• RBC, Residential Plumbing FAQ
• RBC, Certificate of Authorization
• CLB, Licensure with the Board
• CLB, Fees
• CLB, Applications and Forms
• CLB, Doc 165
• CLB, Doc 168 PQP/QP package
• CLB, Technical Exam Waiver Agreements (revised May 2026)
• S.C. Code Title 40, Chapter 11
• S.C. Code Title 40, Chapter 59
• PSI, SC Residential Builders bulletin
• PSI, SC Commercial Contractors bulletin
• Carolinas AGC, SC Trades Certification Program

Verified against S.C. Code Title 40, Chapters 11 and 59, the two boards, the PSI bulletins, and Carolinas AGC on October 7, 2026. Government and testing vendor fees change; confirm current amounts with LLR and PSI before applying. This guide describes the licensing process and is not legal advice.

Ready to move forward? Call 615-219-2110 or visit Hire a Qualifying Agent if you need a qualifier, or License Application Processing if you are ready to file your own RBP or mechanical contractor application.