Last updated 2026-08-18
TL;DR
Tennessee does not have a dedicated mobile welder licensing board. Welding that touches structural, mechanical, or pressure work typically falls under the Tennessee Contractor Licensing Board or local county rules. You'll also need a business registration, general liability insurance, and in some cases an AWS or ASME certification. Startup costs realistically run $500 to $3,000 depending on your county and scope.
Does Tennessee have a mobile welder board?
The short answer is no. Tennessee does not run a stand-alone "mobile welder board" the way some states operate a dedicated welding licensing authority. What it does have is the Tennessee Contractor Licensing Board, administered by the Tennessee Department of Commerce and Insurance (TDCI), which governs most construction and mechanical trades [1]. Whether your mobile welding work falls under that board depends on what you're welding and for whom.
Weld ornamental iron on a residential gate or fix small farm equipment, and you may not need a state contractor license at all. Weld structural steel on a commercial building, pressure vessels, or anything that connects to a public utility system, and you almost certainly do. The line is $25,000 in aggregate annual revenue on a single project, which is the threshold Tennessee uses to trigger the contractor licensing requirement [1]. Below that threshold on a residential project, you may operate under an exemption, but confirm that directly with TDCI because county rules can tighten it.
The practical upshot: mobile welders in Tennessee answer to two overlapping authorities. The state contractor board handles licensure for larger or commercial work. County governments, particularly larger ones like Shelby, Davidson, and Knox, layer on local business licenses and sometimes trade permits on top of that [2].
Do you need a license for mobile welding in Tennessee?
It depends on the work, not on the title "mobile welder." Tennessee law looks at what you're building or repairing, not what you call yourself.
For residential work under $25,000 on a single project, the Tennessee Home Improvement Act applies [3]. The Tennessee Contractor Licensing Board requires home improvement contractors doing $3,000 or more in residential work to hold a Home Improvement license. Welding a handrail, a fence, or farm equipment for a homeowner likely lands here. That license requires passing an exam through PSI Services and carrying general liability coverage of at least $100,000 per occurrence [3].
For commercial work, structural work, or any project above $25,000, you need a Tennessee Contractor License at the appropriate classification. Welding classifications that come up most often for mobile welders include Mechanical (Class B or A) and Electrical if any portion involves electrical connections [1]. Those require passing the Prometric exam, proof of insurance, and a surety bond.
Pressure vessel and pipeline welding adds a third layer. If you're welding anything subject to ASME Boiler and Pressure Vessel Code or AWS D1.1 structural steel standards, the owner of that project (a refinery, utility, or fabrication shop) will require a certified weld procedure and, usually, a current welder qualification test record. The state doesn't issue that certification; the AWS or a third-party testing lab does [4].
For mobile welders working on motor vehicles, Tennessee uses a separate Motor Vehicle Repair Act administered by TDCI. If your mobile rig fixes vehicle frames or exhaust systems for the public, check whether that registration requirement applies to you [5].
The honest summary: most full-time mobile welders in Tennessee need at minimum a Home Improvement license or a county business license, and anyone doing commercial or structural work needs a full Contractor License. Confirm your specific scope with TDCI before you price your first job.
How much does mobile welding cost to set up in Tennessee?
Startup costs for a mobile welder in Tennessee stack several independent fees, so the total swings hard depending on your license tier and county. Here's what the paper trail actually costs, based on published fee schedules as of mid-2025 (confirm current amounts with the issuing agency before you file).
The Tennessee Home Improvement Contractor license application fee is $250, and the exam fee through PSI is roughly $55 [3]. If you're pursuing a full Contractor License (Class B or A), the application fee runs $350 to $750 depending on the monetary limit you're applying for, and the Prometric exam costs around $90 [1].
County and municipal business licenses are separate. Most Tennessee counties charge $15 to $100 for a standard business license under the county clerk's office, though incorporated cities may layer a separate city business tax registration on top [2]. Metro Nashville (Davidson County), for example, has both a county-issued business license and a Metro business tax registration.
General liability insurance for a mobile welder typically runs $800 to $2,500 per year depending on your revenue, coverage limits, and the insurer's read on your work types. The TDCI minimum for a Home Improvement license is $100,000 per occurrence. Most commercial clients want $1,000,000 per occurrence, which is the more common policy tier.
Equipment doesn't count toward your licensing cost, but for context: a used Miller Trailblazer or Lincoln SA-200-class engine-driven welder on a trailer runs $3,000 to $8,000 for a decent used unit. That's separate from the paper path entirely.
Add it up for a realistic baseline: $250 to $750 in license fees, $55 to $90 in exam fees, $800 to $2,500 in first-year insurance, and $15 to $100 in county business license fees. Total paper cost before your first weld: roughly $1,100 to $3,440, depending on license tier and county [1][2][3].
How long does getting licensed as a mobile welder in Tennessee take?
The licensing timeline in Tennessee has two clocks: your own prep time and the state's processing time.
On your side, you need to gather proof of insurance, complete the license application, and schedule and pass the exam. The PSI and Prometric exams for Tennessee contractor licenses are offered at testing centers across the state by appointment, so you can usually get a seat within two to four weeks of applying [1][6]. Some applicants pass on the first attempt after two to six weeks of self-study using the TDCI-listed reference books.
Once you submit a complete Home Improvement application, TDCI targets a processing time of four to six weeks, though this varies with application volume. The agency does not publish a guaranteed turnaround, and incomplete applications restart the clock. Full Contractor License applications can take six to ten weeks if the board needs to review your financial statements or verify insurance.
The realistic total calendar from "I'm starting" to "I have a license in hand" is two to four months for a Home Improvement license, and three to six months for a full Contractor License, assuming no deficiencies in your application.
County business licenses are much faster. Most county clerks in Tennessee issue a business license over the counter or within a few business days of receiving a complete application and fee [2].
If your work requires an AWS welder certification (like D1.1 for structural steel), scheduling a qualification test at a testing facility adds time that's entirely separate from state licensing. AWS doesn't have a fixed timeline; it depends on when a qualified test supervisor and the right base material are available.
What is the Tennessee Contractor Licensing Board and how does it affect welders?
The Tennessee Contractor Licensing Board sits inside TDCI and is the primary state authority for anyone doing construction, mechanical, or specialty trade work commercially in Tennessee [1]. The board sets exam requirements, minimum insurance levels, and license classifications. It also handles complaints and discipline.
For mobile welders, the relevant classifications are: Home Improvement Contractor (for residential work), Class B Contractor (for projects up to $1.5 million), and Class A Contractor (for projects above $1.5 million). There's also a Specialty Contractor path for certain trade categories. Most mobile welders working on farms, residential properties, or small commercial accounts operate at the Home Improvement or Class B level.
Tennessee Code Annotated Title 62, Chapter 6 is the statute that governs contractor licensing in the state [1]. The board meets regularly and posts its meeting schedule on the TDCI website. If you have a borderline-scope question, the board has a staff helpline and will give you a written opinion on whether your work requires licensing, which is worth getting before you spend money on the exam.
One thing that catches mobile welders off guard: Tennessee's contractor law covers the act of contracting more than the act of welding. If you bid a job, write a contract, and get paid for labor and materials, you're a contractor in the state's view, even if you work alone out of a pickup truck.
What county-level rules affect mobile welders in Tennessee?
Tennessee's 95 counties each have some authority to require a local business license, and many cities inside those counties add a city-level requirement [2]. The Tennessee Business Tax Act requires most businesses with gross receipts above $3,000 to register with their county clerk and file an annual business tax return [7]. For mobile welders, that threshold is easy to hit in the first month.
The process is straightforward. You register with the county clerk in the county where your business is principally located, pay the business license fee (typically $15 to $100), and file an annual return with the Tennessee Department of Revenue [7]. If you work in multiple counties, you generally register in your home county but may need to notify other counties depending on local ordinances.
Shelby County (Memphis area) and Davidson County (Nashville) have more involved local licensing requirements than rural counties. Metro Nashville's Codes Administration also issues trade permits for welding work on buildings, and those permits are separate from the contractor license. If you're welding structural components in Nashville, expect to pull a permit on a per-job basis.
Knox County and Hamilton County (Chattanooga) follow a similar pattern: state contractor license plus local business license plus project-level permits when the work touches a building's structure. Confirm current permit requirements with the relevant county codes office before starting any job.
What insurance does a mobile welder in Tennessee need?
Tennessee doesn't have a single statewide insurance minimum that applies to all mobile welders. The floor depends on which license you hold.
For a Home Improvement Contractor license, TDCI requires general liability coverage of at least $100,000 per occurrence [3]. For a Class B or Class A Contractor license, the minimum jumps to $500,000 per occurrence [1]. Those are the legal minimums. In practice, commercial clients (construction companies, manufacturers, refineries) routinely require $1,000,000 per occurrence and will ask for a certificate of insurance naming them as additional insured before you set foot on their property.
Beyond general liability, mobile welders should think about commercial auto coverage for the truck and trailer (personal auto policies typically exclude business use), and inland marine or tools-and-equipment coverage for the welder and ancillary gear. If you hire anyone, even a helper, Tennessee requires workers' compensation for most employers with five or more employees in most industries, though construction is stricter: one or more employees triggers the requirement [8].
A certificate of insurance (COI) with the right additional insured language is the document you'll hand to clients before a job starts. Getting the COI language wrong is one of the most common first-year mistakes. If you want a structured checklist for setting this up, MobileRigPath's Truck-Build + COI Kit at /start walks through the exact documents for a mobile rig.
Do mobile welders in Tennessee need an AWS certification?
AWS (American Welding Society) certification is not required by Tennessee law to operate as a mobile welder. It's a private professional credential, not a government license [4]. You can hold a Tennessee Contractor License and work without any AWS credential.
That said, AWS Certified Welder (CW) status or a specific procedure qualification under AWS D1.1 (structural steel) or D1.2 (aluminum) is required by the customer on many commercial jobs. Fabrication shops, general contractors on commercial sites, pipeline companies, and any work subject to OSHA inspection will ask for your welder qualification record. Not having one limits you to less regulated work.
The AWS CW exam is administered at Accredited Test Facilities (ATFs) around the country, including several in Tennessee. Exam cost varies by facility and process but typically runs $150 to $400 per test. Certification is valid for six months unless you maintain documented continuous employment doing that specific welding process [4].
ASME qualifications (for pressure vessels and boiler work) are separate again. Those are employer-issued qualifications under ASME Section IX, and you need an employer with an ASME stamp to test you.
How does Tennessee compare to neighboring states for mobile welder licensing?
Tennessee sits in the middle of the regional pack for mobile welder licensing complexity. Here's a quick comparison with its neighbors.
| State | Dedicated Welder License? | Contractor License Required? | Notes |
|---|---|---|---|
| Tennessee | No | Yes (Home Improvement or Contractor) | TDCI administers; county business license also needed |
| Georgia | No | Yes (state contractor license) | Georgia Secretary of State has classification-based system |
| Alabama | No | Yes (ALCLB for commercial work) | See Alabama's mobile welder rules |
| Arkansas | No | Yes (Contractors Licensing Board) | Threshold is $20,000; see Arkansas guide |
| Florida | No | Yes (DBPR; exam and bond required) | More complex; see Florida's mobile welder path |
| Colorado | No | Local only in most cases | See Colorado's guide |
Neither Tennessee nor any of its neighbors has a dedicated mobile welder board. The variation is in contractor license thresholds and exam complexity. Florida's contractor exam is widely considered the hardest in the region. Tennessee's is manageable but requires genuine study of TDCI's reference materials.
What's the step-by-step paper path to start a mobile welding business in Tennessee?
Here's the actual sequence most mobile welders in Tennessee follow, in order.
Step 1: Decide your business structure. Register your business with the Tennessee Secretary of State as an LLC or sole proprietor. LLC filing costs $50 online [9]. A sole proprietor operating under their own name may not need to file, but check if you're using a trade name (a DBA requires registration).
Step 2: Get an EIN from the IRS. Free, instant, online. You need this to open a business bank account and file business taxes [10].
Step 3: Register with your county clerk for a business license and with the Tennessee Department of Revenue for business tax purposes [7]. Both happen at the same county clerk office in most Tennessee counties.
Step 4: Get your general liability insurance policy in place. You need this before you can file a contractor license application.
Step 5: Study for and pass the required TDCI exam. For Home Improvement, that's the PSI Home Improvement exam. For Contractor, that's the Prometric Business and Law exam plus the applicable trade exam.
Step 6: Submit your TDCI license application with proof of insurance and your exam score [3]. Pay the application fee.
Step 7: Receive your license. Begin work. Keep your insurance certificate current and renew your contractor license every two years (Home Improvement) or as required for your classification [1].
Step 8 (ongoing): Pull project-level permits when required by the county codes office. This is per-job, not a one-time step.
The only place MobileRigPath fits into this is Step 3 through 5: if you want a pre-built checklist for the COI language and truck documentation, the Truck-Build + COI Kit at /start is built for exactly this stage.
What does Tennessee require for mobile welder vehicle and equipment registration?
Your welding truck is both a business asset and a road vehicle, and Tennessee treats those separately.
On the road side, your truck needs a standard Tennessee vehicle registration and must comply with Department of Transportation weight limits. If your rig (truck plus trailer plus equipment) exceeds 26,001 pounds gross vehicle weight, you need a commercial driver's license (CDL). Most pickup-based mobile rigs stay well under this, but diesel welding trucks with heavy trailers and full fuel tanks can approach the threshold [11].
If you cross state lines for work (common for pipeline and industrial welding), your rig may be subject to FMCSA interstate commerce rules and require a USDOT number. The threshold for requiring a USDOT number is a gross vehicle weight rating or gross combination weight rating of 10,001 pounds or more in interstate commerce [11]. Most serious mobile rigs cross this. FMCSA registration is free.
For the equipment itself, Tennessee doesn't require a separate state registration for a welder or generator mounted on a trailer. But if your trailer is a titled trailer in Tennessee, it needs its own registration and plates through the county clerk's motor vehicle office.
If you work near pipelines, utilities, or on any federal or state job site, keep your DOT medical card current. It's not legally required for every mobile welder, but many job sites treat it as a job site entry requirement.
Frequently asked questions
Do you need a license for mobile welding in Tennessee?
Yes, for most commercial or residential-for-hire work. Tennessee doesn't have a welding-specific license, but the Contractor Licensing Board requires a Home Improvement license for residential welding jobs of $3,000 or more and a full Contractor License for commercial or structural work. Some small or agricultural jobs may fall under exemptions. Confirm your specific scope with the Tennessee Department of Commerce and Insurance before assuming you're exempt.
How much does starting a mobile welding business in Tennessee cost?
The paper costs run roughly $1,100 to $3,440 for the first year. That includes license application fees ($250 to $750), exam fees ($55 to $90), county business license ($15 to $100), and general liability insurance ($800 to $2,500 per year). Equipment is separate. These figures are based on published TDCI fee schedules and market insurance rates as of mid-2025; confirm current fees with TDCI and your insurer.
How long does getting a Tennessee contractor license take for a mobile welder?
Plan two to four months for a Home Improvement Contractor license from start to finish: a few weeks of exam prep, two to four weeks to schedule and pass the PSI exam, and four to six weeks for TDCI to process a complete application. A full Contractor License (Class B or A) often takes three to six months. Incomplete applications reset the timeline, so get your insurance in place before you apply.
Is there a Tennessee mobile welder board I can call directly?
Not a dedicated one. The closest thing is the Tennessee Contractor Licensing Board, part of TDCI. Their main helpline handles trade licensing questions. For county-level questions, contact the county clerk's office in your home county. TDCI's contact page is at tn.gov/commerce. There is no state office that uses the title "mobile welder board."
Does a mobile welder in Tennessee need an AWS certification?
Not by state law. Tennessee doesn't require AWS certification to get a contractor license or operate a mobile welding business. However, many commercial clients, fabrication shops, and construction contractors require proof of a welder qualification test (under AWS D1.1 or similar) before hiring you. No AWS credential limits your market significantly in commercial and industrial work, even if it doesn't limit your license.
What insurance does Tennessee require for a mobile welding business?
TDCI requires at least $100,000 per-occurrence general liability for a Home Improvement license and $500,000 for a Class B or Class A Contractor License. In practice, commercial clients typically require $1,000,000. You also need commercial auto coverage for your truck and trailer, and if you have employees in construction, Tennessee requires workers' compensation starting with one employee. Confirm current minimums with TDCI before applying.
Do I need a business license in my Tennessee county to do mobile welding?
Yes. Tennessee's Business Tax Act requires most businesses earning $3,000 or more in gross receipts to register with their county clerk and file an annual business tax return with the Tennessee Department of Revenue. The registration fee is typically $15 to $100 depending on the county. This is separate from your state contractor license and is required even for sole proprietors.
Can I do mobile welding in Tennessee without a contractor license if it's just farm work?
Possibly. Agricultural and farm equipment repair often falls outside the contractor licensing requirement, especially when work is done on private farmland for the landowner, not under a construction contract. But the exemption has limits and varies by county. The safest move is to call TDCI and describe your exact work scope. Get their answer in writing before you rely on an exemption.
Does Tennessee require a USDOT number for a mobile welding rig?
If your rig has a gross vehicle weight rating or gross combination weight rating of 10,001 pounds or more and you cross state lines for work, yes, you need a USDOT number from FMCSA. Registration is free. If you stay entirely within Tennessee and your vehicle is under commercial weight thresholds, you may not need one, but many job sites require it regardless. Check FMCSA's registration page for current thresholds.
What's the difference between a Home Improvement license and a Class B Contractor license in Tennessee?
A Home Improvement license covers residential work for homeowners and has a lower insurance minimum ($100,000 per occurrence). A Class B Contractor license is required for commercial projects or any project above $1.5 million and requires a higher insurance floor and a more demanding exam. Most mobile welders start with a Home Improvement license and upgrade to Class B as their commercial client base grows.
How often does a Tennessee contractor license renew, and what does renewal cost?
Home Improvement Contractor licenses in Tennessee renew every two years. Full Contractor Licenses also renew on a set cycle administered by TDCI. Renewal fees vary by license classification; confirm current renewal costs on the TDCI contractor licensing fee page. You'll need to show continued proof of insurance at renewal. Letting your license lapse and working without it can result in fines and disciplinary action.
Can a mobile welder in Tennessee work across the border in Kentucky, Georgia, or Alabama without getting separate licenses?
No. Each state has its own contractor licensing law. Working commercially in Kentucky, Georgia, or Alabama requires meeting each state's contractor license requirements. There are no regional reciprocity agreements that automatically transfer a Tennessee license. You'll need to apply in each state where you regularly do paid work. See the Alabama and Georgia state guides on this site for those specific paths.
Are there Tennessee-specific welding codes or standards I have to follow?
Tennessee adopts the International Building Code (IBC) and International Residential Code (IRC) for construction, which reference AWS D1.1 for structural steel and other AWS standards for specific applications. For boilers and pressure vessels, Tennessee follows ASME codes administered through the Tennessee Boiler Section of TDCI. The specific standard that applies to your work depends on what you're welding and where. Your client's engineer of record typically specifies the applicable code.
What happens if I do mobile welding in Tennessee without a required license?
Tennessee Code Annotated Title 62, Chapter 6 authorizes TDCI to impose civil penalties on unlicensed contractors, including fines and a stop-work order. Repeat violations can result in misdemeanor charges. Beyond legal penalties, unlicensed work voids many general liability policies, meaning a claim from a job site injury or property damage comes out of your pocket. The risk isn't theoretical; TDCI actively investigates complaints.
Sources
- Tennessee County Services Association, County Government Overview: Tennessee's 95 counties each have authority to require local business licenses; incorporated cities may add a city-level requirement
- American Welding Society, Certified Welder Program: AWS Certified Welder is a private credential, not a government license; valid six months unless continuous employment in the tested process is documented; exam cost varies by ATF
- Tennessee Department of Commerce and Insurance, Consumer Affairs: Tennessee consumer protection law may require registration or compliance for businesses repairing vehicles for the public, including mobile operators doing frame or structural vehicle work
- PSI Exams Online, Tennessee Contractor Exam Scheduling: PSI administers Tennessee Home Improvement Contractor exam; seats available by appointment at testing centers statewide
- Tennessee Department of Revenue, Business Tax Guide: Tennessee Business Tax Act requires businesses with gross receipts above $3,000 to register with county clerk and file annual business tax return with the Department of Revenue
- Tennessee Department of Labor and Workforce Development, Workers' Compensation: Construction employers in Tennessee must carry workers' compensation starting with one employee, a stricter standard than the five-employee threshold in most other industries
- Tennessee Secretary of State, Business Formation: Tennessee LLC formation fee is $50 when filed online through the Secretary of State
- IRS, Apply for an Employer Identification Number (EIN) Online: EIN is available free and instantly online from the IRS; required for business bank accounts and tax filings
- Federal Motor Carrier Safety Administration, Who Needs a USDOT Number: USDOT number required for vehicles with GVWR or GCWR of 10,001 lbs or more operating in interstate commerce; registration is free