General A Contractor License Explained: What Every GC Needs to Know
A general a contractor license authorizes contractors to perform engineering and infrastructure construction work. This classification covers roads, bridges, dams, pipelines, utilities, and other heavy civil projects. It is distinct from the B (building) classification that covers structural and commercial construction.
For general contractors, understanding the A license classification matters in two situations: when you are pursuing infrastructure projects yourself, and when you are hiring subcontractors for engineering-related scopes on building projects. Hiring a sub with only a B license for underground utility work violates licensing laws in most states.
What the A License Classification Covers
The A license (sometimes called "General Engineering" or "Heavy Civil" depending on the state) authorizes work on fixed structures that require specialized engineering knowledge.
| Scope Category | Typical Work | A License Required? |
|---|---|---|
| Roadway construction | Grading, paving, striping | Yes |
| Bridge construction | Structural bridge work | Yes |
| Pipeline installation | Water, sewer, gas lines | Yes |
| Dam construction | Earth-moving, concrete | Yes |
| Utility infrastructure | Underground services | Yes |
| Site grading | Mass excavation, cut/fill | Yes (in most states) |
| Foundation work | Piers, piles, retaining walls | Depends on state |
| Building construction | Framing, finishes, MEP | No (requires B license) |
How to Get a General A Contractor License
The path to an A license follows the same general framework as other contractor licenses, but with specific requirements for engineering project experience.
Step 1: Document qualifying experience. Most states require 4-5 years of experience specifically in engineering or heavy civil construction. Building construction experience typically does not count toward an A license.
Step 2: Pass the examination. The A license exam covers earthwork, underground construction, highway construction, and engineering project management. Pass rates average 61% on first attempts -- lower than the B license exam due to specialized technical content.
Step 3: Meet financial requirements. A license applicants often face higher bond requirements than B license applicants because infrastructure projects carry larger dollar values. California requires a $25,000 contractor bond plus a disciplinary bond if applicable.
Step 4: Provide proof of insurance. General liability minimums for A license holders typically start at $1,000,000 because infrastructure projects carry higher risk profiles.
A License vs. B License: Key Differences
| Feature | A License (Engineering) | B License (Building) |
|---|---|---|
| Primary scope | Infrastructure, civil works | Buildings, structures |
| Experience type | Heavy civil, engineering | Commercial, residential |
| Exam difficulty | Higher (61% pass rate) | Moderate (68% pass rate) |
| Bond requirements | Often higher | Standard |
| Insurance minimums | Higher risk profile | Standard minimums |
| Project dollar values | Typically $1M+ | Wide range |
| Subcontractor types | Civil trades, operators | Building trades |
Why GCs Need to Verify A License Classification
If your project includes any infrastructure scope -- site utilities, roadwork, or heavy grading -- verify that the sub performing that work holds an A license. A sub with only a B license cannot legally install underground utilities in most states, even if their company has done similar work before.
The consequences of using an incorrectly licensed sub on engineering work include fines up to $15,000, project stop-work orders, and potential license suspension for the GC who hired them. In California, the CSLB fined 847 contractors in 2024 for performing work outside their license classification.
Build license classification verification into your prequalification process. Do not just check that a license exists -- confirm that the classification matches the scope of work you are assigning.
States with Distinct A License Classifications
Not every state uses the "A" designation, but most states with licensing requirements distinguish between building and engineering work.
California uses Class A (General Engineering) and Class B (General Building) as its two primary classifications.
Arizona uses the KB-1 (General Commercial Contractor) and KB-2 (General Engineering) classifications.
Nevada uses Class A (General Engineering), Class B (General Building), and Class C (Specialty).
Oregon uses a single commercial contractor license but requires endorsements for specific engineering work.
Check your state's classification system and map it to the scope of work before assigning contracts.
FAQs
Can a contractor hold both an A and B license? Yes. Many large GCs hold both classifications to bid on projects that include building and engineering scopes. Each license requires separate qualifying experience, exams, and fees. Holding both gives you maximum flexibility but doubles your licensing maintenance burden.
Does an A license allow you to do building construction? No. An A license is limited to engineering and infrastructure work. Performing building construction (framing, finishes, MEP rough-in) with only an A license violates licensing laws. You need a B license for building work, even if the building sits on a site you graded with your A license.
How long does it take to get a general A contractor license? Plan for 3-6 months from application to approval. The timeline includes experience verification (4-8 weeks), exam scheduling and completion (2-4 weeks), bond procurement (1-2 weeks), and board review (4-8 weeks). Some states offer expedited processing for an additional fee.
What insurance is required for an A license holder? Minimum requirements typically include $1,000,000-$2,000,000 in general liability, statutory workers' compensation, and $500,000+ in commercial auto coverage. Infrastructure projects often require additional pollution liability and professional liability coverage depending on the scope.
Can an A-licensed sub work on the building portion of a project? No. If your project includes both site infrastructure and building construction, you need subs with appropriate licenses for each scope. An A-licensed sub handles the grading and utilities. A B-licensed sub handles the building. Cross-scope work is a licensing violation.
What happens if an A license expires during an infrastructure project? The contractor must stop work immediately. Continued work with an expired license voids insurance coverage, triggers regulatory fines, and exposes the GC to liability. Monitor license expiration dates for all subs and alert them 60 days before expiration.
Verify Every License Classification Automatically
SubcontractorAudit checks license type, number, classification, and status during prequalification. The platform monitors for expirations and suspensions throughout the project. Request a demo to see how automated license verification works.
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