Decision guide
General Engineering (A) vs General Building (B): Fixed Works or Structures?
The A and B classifications are both "general" classifications, which leads applicants to treat them as interchangeable. They are not. The distinction generally turns on whether your work is fixed engineering works or structures that combine unrelated trades.
General Engineering (A)
Oriented toward fixed works requiring specialized engineering knowledge: infrastructure, grading, utilities, and roadway projects.
General Building (B)
Oriented toward structures requiring at least two unrelated building trades, including residential and commercial buildings.
Side-by-side criteria
| Criterion | General Engineering (A) | General Building (B) |
|---|---|---|
| Core project type | Infrastructure, grading, utilities, roadway, and other fixed works | Buildings and structures combining unrelated trades |
| Knowledge emphasis | Engineering principles applied to fixed works | Multi-trade building construction and coordination |
| Typical clients | Public agencies, developers, and utility owners | Homeowners, developers, and commercial property owners |
| Experience CSLB expects to see | Earthwork, utility, and infrastructure supervision | Structural and multi-trade building supervision |
| Exam focus areas | Grading, utilities, trenching safety, paving, and public-works administration | Framing, envelope, trade sequencing, and building inspection milestones |
| Vertical building work | Generally outside scope when it combines unrelated trades | Generally within scope |
| Holding both | Common for contractors who genuinely perform both types of work | Common for contractors who genuinely perform both types of work |
Which one fits you
Lean toward General Engineering (A) if
- Your projects are grading, utilities, roadway, or other infrastructure
- Your clients are largely public agencies or utility owners
- Your experience records document earthwork and underground scope
- You bid site and civil packages rather than building shells
Lean toward General Building (B) if
- Your projects are buildings involving two or more unrelated trades
- You supervise framing, envelope, and finish phases
- Your clients are homeowners, developers, or commercial owners
- You want to bid vertical construction as the prime contractor
Classification scope is defined by CSLB. This comparison summarizes how the two classifications are commonly distinguished; confirm the controlling scope language with CSLB before bidding work.
Frequently asked questions
Can an A contractor build a house?
Building a habitable structure that combines unrelated trades is generally associated with the B classification. Contractors who do both types of work commonly hold both classifications rather than stretching one.
Which classification is broader?
Neither is simply broader — they cover different categories of work. A is oriented toward fixed engineering works and B toward structures combining unrelated trades.
Can I hold both A and B?
Yes, contractors frequently hold multiple classifications. Each addition requires experience documented specifically for that classification.
Where should I verify this before making a decision?
Use the official CSLB classification and applicant pages linked below. Classification scope, examination requirements, and fees change, so treat CSLB as the authority and this page as orientation.