South Carolina regulates contractors through two separate state-level boards. The Contractor's Licensing Board (CLB) oversees commercial general and mechanical contractors, while the Residential Builders Commission (RBC) regulates residential builders, residential specialty contractors, and home inspectors. Both boards operate under the South Carolina Department of Labor, Licensing and Regulation (LLR).
On the commercial side, a license is required when regulated work exceeds $10,000 in total cost (SC Code §40-11-30). On the residential side, builders are regulated for projects above $5,000, and residential specialty contractors are regulated above $500 (SC Code §40-59-20). Working without the required license carries criminal penalties including fines and imprisonment.
This guide covers both the commercial and residential licensing systems in South Carolina: license types, requirements, application procedures, exams, fees, bonding, renewal, reciprocity, and penalties for unlicensed work.
Types of Contractor Licenses
South Carolina's dual-board system means the license you need depends on whether the work is commercial or residential. Here is how each board categorizes its licenses.
Commercial Licenses (Contractor's Licensing Board)
The CLB issues licenses for General Contractors and Mechanical Contractors. Each license is further divided into classifications and subclassifications, along with financial "groups" that set the maximum dollar value of work you can perform on a single project.
General Contractor Classifications
General contractor classifications include Limited Building, Unlimited Building, Highway, Bridges, Concrete Paving, Asphalt Paving, Grading, Water & Sewer Plants/Lines, Roofing, Swimming Pools, and Wood Frame Structures. The full list of classification abbreviations and group dollar limits is published on the CLB applications page, with regulated classifications defined in §40-11-410.
Mechanical Contractor Classifications
Mechanical contractor classifications include Air Conditioning, Electrical, Heating, Lightning Protection, Packaged Equipment, Plumbing, Process Piping, and Refrigeration.
Financial Groups
CLB licenses are issued in groups (1 through 5) that determine the maximum contract value for a single project. You must demonstrate the financial capacity for your requested group through a financial statement or surety bond. Group limits and required bond amounts are published on the CLB licensure page.
Residential Licenses (Residential Builders Commission)
The Residential Builders Commission issues the following credentials:
- Residential Builder — For construction, improvement, or repair of residential structures up to 3 stories and 16 units, on projects exceeding $5,000.
- Residential Electrical — Licensed residential electrical contractor.
- Residential HVAC — Licensed residential heating, ventilation, and air conditioning contractor.
- Residential Plumbing — Licensed residential plumbing contractor.
- Residential Specialty Contractor Registration — For specialty trades such as siding, insulation, roofing, floor covering, masonry, drywall, carpentry, stucco, painting/wallpapering, and solar panel installation. Registrations may cover no more than 3 classifications; more than 3 requires licensure as a residential builder (§40-59-240).
- Home Inspector — Licensed home inspector.
- Certificate of Authorization (COA) — Required when a licensee does not own at least 51% of the business and is not the sole resident licensee for the firm (§40-59-410).
Separate Trade Systems
Fire sprinkler work (licensed under Title 23, Chapter 45) and burglar/fire alarm work (licensed under Title 40, Chapter 79) are excluded from the CLB's jurisdiction and have their own licensing requirements (§40-11-360).
Local Business Licenses and Permits
After obtaining state licensure, cities and counties may still require local business licenses and/or permits. Local building officials must refuse permits unless the applicant shows required state licensure or exemption (§40-11-350, §40-59-280).
Licensing Requirements
Commercial Contractor Requirements
Commercial applicants must designate a Primary Qualifying Party (PQP) for each classification. The PQP is the individual whose experience and exam results qualify the business. Key requirements include:
- Experience: At least 2 years of work experience within the last 5 years in the relevant classification (unless applying by waiver or reciprocity).
- Technical Exam: The PQP must pass the required technical exam for the classification, or qualify through a waiver, reciprocity, or MASC/CAGC certification.
- Law Exam: All applicants must pass the South Carolina Business Management and Law for Commercial Contractors exam.
- Passing Score: 70% or better on each required exam (§40-11-230).
- Financial Statement or Bond: Applicants must support their requested group limit with a financial statement or surety bond.
- Secretary of State Documents: Authority/existence documents and articles/ownership documents are required.
Regarding background checks and general liability insurance minimums for commercial applicants, verify current requirements directly with the CLB and §40-11-140, as the board's published pages do not state a fixed general liability minimum.
Residential Builder Requirements
- Experience: At least 1 year of experience under a licensed builder or general contractor. The Commission may also accept other education or experience or a combination if approved (§40-59-220).
- Exam: Must pass the required residential builder exam (administered by PSI).
- Surety Bond: An executed bond of at least $15,000 or proof of financial responsibility acceptable to the Commission.
- Credit Report: A credit report is required for residential applicants.
- Background Check: If you answer yes to conviction questions on the application, you must submit an official statewide background check. South Carolina residents use SLED; non-residents use their resident state's law-enforcement-equivalent check. Background checks are only required if you have prior arrests or convictions (Home Builder Instructions).
Residential Specialty Contractor Requirements
Licensed residential specialty trades (electrical, HVAC, plumbing) require passing a trade-specific exam and posting a $10,000 bond. Registered residential specialty trades (siding, insulation, roofing, floor covering, masonry, drywall, carpentry, stucco, painting/wallpapering, solar panel installation) require a $5,000 bond. Each type also requires a credit report and, if applicable, background check documentation (Residential licensure page).
Application Process
Commercial License Application
The commercial application process is handled through the CLB. Here are the steps:
- Pass Required Exams: The PQP must complete all required technical exams (or obtain waiver/reciprocity approval) and pass the South Carolina Business Management and Law exam before submitting the application.
- Complete the Application: Download Doc 165 (PDF) from the CLB website.
- Gather Supporting Documents: Prepare Secretary of State authority/existence documents, articles/ownership documents, financial statement or surety bond, PQP/QP paperwork, and PSI pass sheets or approved waiver verification.
- Submit the Application: Completed applications may be submitted by mail, email, or in person to the CLB at 110 Centerview Dr., Columbia, SC 29210.
- Pay the License Fee: The initial commercial license fee is $350.
The CLB does not publish a specific processing timeline. For status updates, contact the CLB at Contact.CLB@llr.sc.gov or (803) 896-4686.
Residential Builder Application
- Submit the Online Application: Apply through the LLR online application portal following the Home Builder Instructions.
- Wait for Review: Allow 7 to 10 business days before checking application status.
- Receive Exam Eligibility: If the application is complete, you will receive an exam-eligibility letter.
- Schedule and Pass the PSI Exam: Schedule your exam through PSI and pass.
- Submit Final Documents: After passing, submit your test results, license fee, and the original surety bond to the Commission.
Residential HVAC, Plumbing, and Specialty Applications
Use the same LLR online application portal with the relevant instruction page:
Each application type follows the same general process: submit the application, allow 7 to 10 business days for review, receive exam eligibility (if applicable), pass the exam, then submit final documents and fees.
Examination Requirements
Commercial Exams
Commercial contractor exams are administered by PSI. All commercial applicants must pass two exams:
- Technical Exam: Specific to your classification (e.g., Unlimited Building, Electrical, Plumbing, HVAC, Highway, etc.).
- South Carolina Business Management and Law for Commercial Contractors Exam: Required for all commercial classifications.
Both exams require a minimum passing score of 70% (§40-11-230). Applicants who qualify through a waiver, reciprocity agreement, or MASC/CAGC certification may have the technical exam waived, but the South Carolina law exam is always required.
Residential Exams
Residential exams are also administered by PSI. The specific exam depends on your license type:
- Residential Builder Exam
- Residential Electrical Exam
- Residential HVAC Exam
- Residential Plumbing Exam
Exact passing scores for residential exams are not published on the Commission's website. Verify current passing score requirements with the Residential Builders Commission or the relevant instruction page before scheduling your exam.
Exam Fees
Exact PSI exam fees are not published on the CLB or RBC websites. Verify current exam fees directly with CLB or the Residential Builders Commission when scheduling your exam.
License Fees and Costs
South Carolina's licensing fees vary depending on whether you are applying for a commercial or residential license. All fees below are from the CLB fee schedule and the Residential Builders Commission licensure page.
Commercial License Fees (CLB)
| Fee Type | Amount |
|---|---|
| Initial License Fee | $350 |
| Renewal Fee | $135 |
| Late Renewal (Nov 1 – Nov 30) | $235 |
| Late Renewal (Dec 1 – Dec 31) | $285 |
| Late Renewal (Jan 1 – Jan 31) | $335 |
| Reinstatement Fee | $350 |
Residential Builder Fees
| Fee Type | Amount |
|---|---|
| Application Fee | $135 |
| License Fee | $220 |
| Renewal Fee | $220 |
| Late Renewal Penalty | $50 |
| Reinstatement Fee | $480 |
Residential Specialty License Fees
| License Type | Application | License | Renewal | Late Renewal | Reinstatement |
|---|---|---|---|---|---|
| Residential Electrical | $135 | $220 | $220 | $50 | $480 |
| Residential HVAC | $100 | $220 | $220 | $50 | $480 |
| Residential Plumbing | $135 | $220 | $220 | $50 | $480 |
| Specialty Registration | — | $100 | $100 | $20 | $290 |
Certificate of Authorization (COA) Fees
| Fee Type | Amount |
|---|---|
| COA License Fee | $100 |
| COA Renewal Fee | $100 |
After the COA renewal deadline, the Commission requires the firm to reapply rather than allowing late renewal.
Insurance and Bond Requirements
Commercial Contractor Bonds
Commercial contractors must post a surety bond based on their license type and financial group. The CLB publishes the following bond requirements by group (CLB licensure page, Doc 165):
General Contractor Bond Amounts
| Group | Bond Amount |
|---|---|
| Group 1 | $20,000 |
| Group 2 | $60,000 |
| Group 3 | $150,000 |
| Group 4 | $250,000 |
| Group 5 | $350,000 |
Mechanical Contractor Bond Amounts
| Group | Bond Amount |
|---|---|
| Group 1 | $7,000 |
| Group 2 | $15,000 |
| Group 3 | $30,000 |
| Group 4 | $60,000 |
| Group 5 | $300,000 |
Applicants may alternatively support their requested group limit with a qualifying financial statement in lieu of a bond.
Residential Bonds
The Residential Builders Commission requires the following surety bonds (Bond form):
| License Type | Bond Amount |
|---|---|
| Residential Builder / COA | $15,000 |
| Licensed Residential Specialty (Electrical, HVAC, Plumbing) | $10,000 |
| Registered Residential Specialty Contractor | $5,000 |
Workers' Compensation Insurance
The CLB statute indicates the board may consider workers' compensation insurance. Verify specific workers' compensation requirements for your license type with the CLB or Residential Builders Commission.
General Liability Insurance
The CLB does not state a fixed general liability insurance minimum on its published pages. However, carrying general liability insurance is standard industry practice and is often required by project owners and general contractors. Verify current requirements with the CLB.
License Renewal
Commercial License Renewal
Commercial licenses operate on a biennial (two-year) cycle:
- General Contractor licenses expire October 31 of even-numbered years.
- Mechanical Contractor licenses expire October 31 of odd-numbered years.
The renewal fee is $135 if submitted on time. Late renewal penalties increase monthly through January 31:
- November 1 – November 30: $235
- December 1 – December 31: $285
- January 1 – January 31: $335
After January 31, reinstatement is required at a cost of $350. Details are on the CLB renewals page.
No continuing education requirement is stated on the CLB renewal page. Verify with the CLB for the most current information.
Residential Builder and Home Inspector Renewal
The 2026–2028 renewal period opens in April 2026 with a deadline of June 30, 2026. The renewal fee is $220, with a $50 late fee if submitted after the deadline. The Commission states there is currently no continuing education requirement for residential builders or home inspectors (Residential renewals page).
Residential Specialty, HVAC, Plumbing, and Electrical Renewal
These licenses operate on a separate biennial cycle. The 2025–2027 cycle deadline without penalty was June 30, 2025. Late renewal runs through June 30, 2026. After that date, reinstatement is required. Specialty registration renewal is $100 with a $20 late fee; licensed specialty (electrical, HVAC, plumbing) renewal is $220 with a $50 late fee (Residential renewals page).
COA Renewal
All Certificates of Authorization are renewable before June 30 each year, regardless of issue date. Renewal costs $100 and requires a current $15,000 surety bond. After the deadline, the firm must reapply (Residential renewals page).
Reciprocity with Other States
South Carolina offers technical exam waivers for both commercial and residential applicants who hold qualifying licenses from other states. However, the South Carolina law exam is always required regardless of reciprocity.
Commercial Exam Waivers
The CLB accepts technical exam waivers from the following states, with specific exam-to-classification mappings detailed in the CLB Waiver Agreements (PDF):
- Alabama
- Georgia
- Louisiana
- Mississippi
- North Carolina
- Ohio
- Pennsylvania (Reading)
- Tennessee
- Texas
- Utah
- CAGC / MASC certifications
NASCLA Acceptance (Commercial)
The CLB accepts the NASCLA Commercial General Building Contractors exam for the Unlimited Building classification and the NASCLA Electrical Examination Program for the Electrical classification. South Carolina accepts results from all states administering NASCLA Building and Electrical accredited exams (Waiver Agreements PDF).
Residential Exam Waivers
The Residential Builders Commission accepts technical exam waivers as follows (Residential licensure page):
| SC License Type | Accepted Waivers From |
|---|---|
| Residential Builder | Alabama, Georgia, Louisiana, Mississippi, North Carolina, SC CLB, NASCLA National Contractors Exam |
| Residential Electrical | North Carolina, Mississippi, NASCLA Electrical Exam |
| Residential HVAC | Alabama, North Carolina, Mississippi |
| Residential Plumbing | North Carolina, Mississippi |
All waiver applicants must still pass the South Carolina Business Management and Law exam and meet all other application requirements.
How to Verify a Contractor's License
South Carolina provides a free online verification tool for both commercial and residential contractor licenses. This is essential for homeowners, general contractors, and building officials.
License Lookup
URL: https://verify.llronline.com/
This tool is linked from both the CLB website and the Residential Builders Commission website. You can search for any licensed contractor and verify their license status, classifications, and standing.
Contact Information
| Board | Contractor's Licensing Board (CLB) | Residential Builders Commission (RBC) |
| Phone | (803) 896-4686 | (803) 896-4696 |
| Contact.CLB@llr.sc.gov | Contact.RBC@llr.sc.gov | |
| Address | 110 Centerview Dr., Columbia, SC 29210 | |
| Online Applications | LLR Online Portal | |
Penalties for Working Without a License
South Carolina imposes significant penalties for unlicensed contracting work under both the commercial and residential statutes.
Commercial Unlicensed Work
Unlicensed commercial contracting is a misdemeanor under §40-11-200, punishable by:
- Up to 1 year imprisonment, or
- Up to $5,000 fine, or both
The CLB may also impose a civil penalty of up to $5,000 per violation and order an unlicensed contractor to cease and desist (§40-11-110).
Owners and awarding authorities may not consider bids, sign contracts, or let work begin unless the contractor holds the required license. Local officials must refuse permits without proof of licensure or exemption (§40-11-350).
Residential Unlicensed Work
Unlicensed residential building or specialty contracting is a misdemeanor under §40-59-30, punishable by:
- A fine of $500 to $10,000, or
- At least 30 days imprisonment, or both
Unlicensed residential contractors cannot file a mechanics' lien or sue to enforce the contract.
Additional Residential Penalties
- The Commission may issue cease-and-desist orders. Willful violation of an order can bring $250 to $2,000 per violation (§40-59-210).
- For licensed or registered parties, the Commission may impose up to $2,500 per offense on disciplinary grounds (§40-59-120).
- Local building officials must refuse permits without proof of required licensure, registration, or exemption (§40-59-280).
Roofing and Insurance Fraud Protections
Roofing contracts tied to insurance denials can be canceled within 5 business days after written denial. Builders and contractors may not rebate or promise to pay insurance deductibles — violating this rule is a misdemeanor and grounds for license suspension or revocation (§40-59-25).
Frequently Asked Questions
Do I need a commercial or residential license in South Carolina?
It depends on the type of work. Commercial general and mechanical contracting on projects over $10,000 requires a CLB license. Residential building on projects over $5,000 and residential specialty work over $500 requires credentials from the Residential Builders Commission. The two boards are completely separate, and you may need licenses from both if you do both types of work.
How long does it take to get a South Carolina contractor license?
For residential licenses, the Commission says to allow 7 to 10 business days for application review. After receiving exam eligibility, you must schedule and pass the PSI exam, then submit final documents. The total timeline depends on how quickly you complete each step. The CLB does not publish a specific processing timeline for commercial applications — contact the CLB directly for current wait times.
What exams do I need to pass?
Commercial applicants need a technical exam for their classification and the South Carolina Business Management and Law exam, both requiring a 70% passing score. Residential applicants need the exam for their specific license type (builder, electrical, HVAC, or plumbing). All exams are administered by PSI.
Does South Carolina require continuing education for contractors?
Currently, no continuing education is required for residential builders or home inspectors, according to the Residential Builders Commission. The CLB also does not state a CE requirement on its renewal page. However, the Commission has statutory authority to require CE by regulation in the future, so check the renewal pages before each cycle.
Can I use a license from another state in South Carolina?
South Carolina offers technical exam waivers (not full reciprocity) for contractors licensed in several states including Alabama, Georgia, Louisiana, Mississippi, North Carolina, and others. The NASCLA Commercial General Building and Electrical exams are also accepted. However, you must still pass the South Carolina law exam and meet all other requirements.
What happens if I work without a license in South Carolina?
Unlicensed commercial work is a misdemeanor carrying up to 1 year imprisonment and/or a $5,000 fine, plus civil penalties of up to $5,000 per violation. Unlicensed residential work carries fines from $500 to $10,000 and/or at least 30 days imprisonment. Additionally, unlicensed residential contractors cannot file mechanics' liens or enforce contracts in court.
Conclusion
South Carolina's dual-board licensing system requires careful attention to which board governs your type of work. Commercial contractors work through the Contractor's Licensing Board with its classification and financial group system, while residential builders and specialty contractors work through the Residential Builders Commission. Both paths require exams, surety bonds, and compliance with South Carolina law.
Start your commercial application by downloading Doc 165 from the CLB, or begin your residential application through the LLR online portal. For questions, contact the CLB at (803) 896-4686 or the RBC at (803) 896-4696.
This article is provided for informational purposes and was last updated in April 2026. Licensing requirements, fees, and regulations are subject to change. Always verify current requirements directly with the Contractor's Licensing Board or the Residential Builders Commission.