In most cases, yes — subcontractors need a license to work legally, but whether that license comes from the state, the city, or a trade board depends on where the job is and what kind of work is involved. Roughly half of U.S. states issue contractor licenses at the state level; the rest leave it to cities and counties. Certain trades, like electrical and plumbing, require professional certification no matter where the project sits, and some work triggers federal certification on top of that. A general contractor’s license does not cover the subcontractors working under them, so each subcontractor is responsible for holding their own credentials.
When a State License Is Required
About 27 states require contractors and subcontractors to hold a state-issued license before performing construction or specialty trade work. The remaining states delegate licensing to local governments. Even among the states that license at the state level, the rules are not uniform. Some require a license only when the total cost of labor and materials exceeds a set dollar threshold. Others require one for any paid work, no matter how small.
States that license typically ask applicants to show trade experience, pass a technical or business-and-law exam, carry minimum insurance, and in some cases post a surety bond. Fees generally run from a few hundred dollars to over a thousand. Processing can take anywhere from a few weeks to several months depending on the board.
The penalties for skipping a required state license are not minor. In several states, unlicensed contracting is a misdemeanor that can carry fines of several thousand dollars and possible jail time. Administrative fines can accrue per violation or per day. On top of that, courts in many jurisdictions have held that an unlicensed contractor cannot sue to collect unpaid amounts, even if the work was done correctly. Several large construction states also bar unlicensed contractors from filing a mechanic’s lien, which is the main tool for securing payment on a job.
When Licensing Is Handled Locally
In states without a statewide licensing requirement, cities and counties fill the gap. Common local requirements include a business tax receipt, a certificate of competency, or registration with the local building department before pulling any permits. These rules can change from one municipality to the next, so a subcontractor working across several towns may need separate approvals in each.
Local rules can also apply on top of state ones. A state exemption for small repairs does not override a local ordinance that still requires registration or a permit for the same work. Checking directly with the city or county building department before starting is the most reliable way to confirm what applies.
Ignoring local requirements invites stop-work orders, which halt everything on site until the paperwork is sorted out. Code enforcement can also issue daily fines that keep running until compliance is documented. Those delays hit the general contractor and property owner too, which is why GCs often check a subcontractor’s local status before letting them on the job.
Who Pulls the Permit
Whoever performs the work usually pulls the permit. General contractors obtain structural and building permits; specialty subcontractors — electricians, plumbers, HVAC installers — pull the trade permits for their portion of the work. Property owners should confirm permits are in place before work starts, because unpermitted work tends to resurface during inspections or at resale.
Trades That Always Need Certification
Some trades require professional certification regardless of project size, dollar amount, or how the state otherwise handles licensing. Electrical, plumbing, and mechanical work fall into this group because mistakes can cause fires, flooding, gas leaks, or structural failure. Handyman exemptions that cover small jobs do not reach into these specialties.
Electricians have to follow the National Electrical Code, which is enforced in all 50 states and sets the baseline for safe electrical design and installation.1National Fire Protection Association. NFPA 70 (NEC) Code Development Plumbers and HVAC technicians work under similarly strict codes. Certification in these trades typically takes thousands of hours of supervised apprenticeship followed by a technical exam, and ongoing continuing education — commonly around 14 hours per renewal cycle — is required to keep the credential active.
Penalties for performing licensed trade work without credentials are heavy, and repeat violations can reach tens of thousands of dollars in some jurisdictions. Insurers routinely deny claims for damage or injury tied to uncertified work, which pushes the financial risk back onto the subcontractor personally.
Federal Certifications That Apply Nationwide
Two federal certifications sit on top of state and local licensing and apply regardless of where the work is done.
EPA Section 608 for Refrigerants
Any technician who maintains, services, repairs, or disposes of equipment containing refrigerants must hold an EPA Section 608 certification under the Clean Air Act. This reaches HVAC subcontractors, refrigeration technicians, and anyone whose work could release refrigerants into the atmosphere. The EPA recognizes four levels: Type I for small appliances, Type II for high-pressure systems, Type III for low-pressure systems, and Universal for all equipment. Certification requires passing an EPA-approved test.2US EPA. Section 608 Technician Certification Requirements Apprentices working under the direct supervision of a certified technician are exempt until they work independently.
Lead Renovation, Repair, and Painting Rule
Subcontractors who disturb paint in housing or child-occupied facilities built before 1978 must comply with the EPA’s Lead Renovation, Repair, and Painting (RRP) Rule. The firm must be EPA-certified, and the work must be performed or directed by a certified renovator.3US EPA. Renovation, Repair and Painting Program – Firm Certification If a general contractor hires a subcontractor for RRP-covered work, both the GC and the sub need their own firm certifications.4EPA. EPA Lead-Based Paint Program Frequent Questions All firms involved share responsibility for keeping compliance records for three years after the job is finished.
Why a Subcontractor Can’t Work Under the GC’s License
One of the most common misconceptions in the trades is that a subcontractor can legally operate under the general contractor’s license. Licensing boards treat each subcontractor as an independent legal entity, and the GC’s license does not extend to anyone working beneath it. Where a license is required, both parties need their own.
The payment consequences are what make this misconception expensive. In many states, a subcontractor who was unlicensed when the work was performed cannot file a mechanic’s lien, which is the primary legal tool for securing payment on a construction project. Some states go further and bar unlicensed subcontractors from filing any lawsuit to recover unpaid amounts. The practical result: working without a required license can mean forfeiting all compensation if a dispute arises, no matter how well the work was done.
General contractors carry their own exposure here. State boards can suspend or revoke a GC’s license for knowingly using unlicensed subs. Property owners may also see insurance claims denied if damage traces back to uncredentialed work. Most state licensing boards publish searchable online databases, and verifying a sub’s status before work starts is the standard precaution on both sides.
What Else Is Required Alongside a License
A license by itself usually isn’t enough to get a subcontractor on site. Most general contractors and project owners require proof of insurance and, depending on the state, a surety bond before work begins.
Commercial general liability insurance covers bodily injury and property damage caused by the subcontractor’s work, with industry-standard minimums typically at $1,000,000 per occurrence and $3,000,000 in aggregate. GCs commonly require a certificate of insurance before work starts and often ask to be named as an additional insured on the sub’s policy.
Workers’ compensation rules vary by state. Sole proprietors without employees can often exempt themselves, but if a GC hires a sub who lacks coverage and that sub is later reclassified as an employee through a claim or audit, the GC can inherit the liability. For that reason, many GCs require proof of workers’ comp from every subcontractor, including sole proprietors who would otherwise be exempt.
Some states also require a surety bond as a condition of licensure. A license bond protects consumers and project owners if the subcontractor fails to follow regulations or finish the work. On federal construction projects exceeding $100,000, the Miller Act requires the prime contractor to post both performance and payment bonds, and the payment bond gives subcontractors and suppliers a direct avenue to recover unpaid amounts.5Acquisition.GOV. Part 28 – Bonds and Insurance
Business registration is a separate step from licensing. Subcontractors who form an LLC, corporation, or partnership generally register with the Secretary of State in any state where they do business, while sole proprietors operating under their own legal name usually do not need to register.6U.S. Small Business Administration. Register Your Business A valid LLC and full insurance still do not substitute for a trade license where one is required.
Working Across State Lines
Subcontractors who take jobs in more than one state generally need a license in each one. Some states ease the burden through reciprocity agreements that waive the trade exam for applicants already licensed in a participating state. Reciprocity typically waives only the exam itself — the application, fees, and a state-specific business and law exam may still apply.
The National Association of State Contractors Licensing Agencies (NASCLA) runs an accredited examination program meant to cut down on redundant testing. States that accept the NASCLA Accredited Examination for Commercial General Building Contractors let qualified subcontractors take one standardized exam in place of multiple state-specific ones, and a parallel accredited electrical exam exists for electricians. Participation isn’t universal, and reciprocity may cover only certain license classifications, so confirming the specific arrangement with each state’s licensing board before accepting out-of-state work is the safer approach.