C-8 — Concrete

A California C-8 Concrete contractor license lets you form, pour, place, and finish concrete work — from flatwork to structural formwork — for hire on jobs over the state’s minor-work threshold. Earning one means passing two separate CSLB exams (the C-8 trade exam and the Law & Business exam), documenting at least four years of qualifying journey-level concrete experience, and posting a contractor’s bond before your license is issued.

What a C-8 license covers

Under California Code of Regulations, Title 16, Section 832.08, a concrete contractor “forms, pours, places, finishes and installs specified mass, pavement, flat and other concrete work; and places and sets screeds for pavements or flatwork.” The classification also lets a C-8 contractor build and strip the wood formwork that shapes the pour, and place reinforcing steel and embedded items as part of that same concrete scope. It does not, however, cover contractors whose sole business is applying plaster coatings, or businesses that only place or erect reinforcing steel as a standalone trade — those fall under separate classifications (C-35 Lathing and Plastering, and C-50 Reinforcing Steel, respectively).

In practice, a licensed C-8 contractor’s day-to-day work includes jobs like:

• Driveways, patios, and sidewalks — forming, pouring, and finishing residential flatwork, including exposed-aggregate, stamped, or colored decorative finishes.
• Foundations and footings — forming and pouring spread footings, stem walls, and slab-on-grade foundations for new homes, additions, and ADUs.
• Retaining and site walls — formed and poured concrete walls for grade changes, planters, and property-line walls (as distinct from block/masonry walls, which fall under C-29).
• Tilt-up and structural panels — casting and setting concrete wall panels for warehouses, tilt-up commercial buildings, and light-industrial construction.
• Pool decks and hardscape flatwork — pouring the concrete decking around a pool or spa (the pool shell itself requires a separate C-53 Swimming Pool license).
• Curb, gutter, and parking lot concrete — municipal and commercial concrete paving, curb ramps, and gutter replacement (asphalt paving is a separate C-32 scope).

C-8 exam breakdown

Every C-8 applicant sits two separate, closed-book, multiple-choice exams administered by PSI Exams at a computer testing center: the classification-specific C-8 Concrete trade exam and the Law & Business exam required of every CSLB classification. Per CSLB’s exam FAQ, each exam is allotted 3.5 hours, questions are written with four answer choices and one best answer, and a calculator is provided on-screen for math-based questions.

CSLB’s official C-8 study guide publishes the exam’s content-area weighting, so applicants know where to focus:

• Planning and Estimating — 28%
• Pre-placement Preparation (demolition, grading, excavating, layout, forming, drainage/moisture barriers, reinforcement and embedded items) — 28%
• Placing and Finishing (placing concrete, applying finishes, curing and testing) — 19%
• Safety (employee and job-site safety) — 17%
• Post-placement Tasks (stains and sealers, stripping forms, repair, grouting, and caulking) — 8%

Note on scoring: CSLB does not publicly publish the exact number of scored questions or the numeric passing threshold for the C-8 exam — a candidate’s official results report shows pass/fail only, not a percentage score. Test-prep companies commonly cite figures such as “115 questions” or “a 72% cutoff,” but those are third-party estimates, not board-confirmed numbers, so treat them as approximate rather than official.

C-8 license requirements

To qualify for the trade exam, you need at least four years of full-time, journey-level concrete experience within the 10 years before you apply — as a journeyman, foreman, supervising employee, contractor, or owner-builder performing the work yourself (not merely managing others). CSLB allows partial credit toward that four-year requirement for relevant education and training: a related associate degree can offset up to 1.5 years, and a related bachelor’s degree up to 3 years, but at least one full year must still be verifiable hands-on field experience.

The application path is:

1. File the Application for Original Contractor License with CSLB, including your certified experience and a qualifier who can verify it.
2. Pay the nonrefundable $450 application fee (current CSLB fee schedule).
3. Once CSLB authorizes you, schedule and pass both the C-8 trade exam and the Law & Business exam through PSI.
4. Complete a Live Scan fingerprint background check.
5. Obtain a $25,000 contractor’s bond (Business & Professions Code 7071.6); an LLC applicant must also carry a separate $100,000 LLC employee/worker bond.
6. Secure workers’ compensation insurance if you’ll have employees, or file a CSLB exemption certificate if you’ll work solo with no employees.
7. Pay the initial license fee to activate your license once CSLB issues your number.

For the full walkthrough and current numbers on every fee, see our step-by-step application guide and fee and bond breakdown.

C-8 vs. adjacent classifications

Concrete work overlaps with several other CSLB classes, and picking the wrong one is a common licensing mistake:

• C-8 vs. B (General Building): A B contractor can perform concrete work as part of a larger project requiring at least two unrelated building trades (framing, roofing, concrete, etc. on one job), but cannot contract for a standalone concrete-only job. If a homeowner is hiring you to pour a driveway or patio and nothing else, that’s a C-8 contract, not a B contract.
• C-8 vs. A (General Engineering): A covers “fixed works” — highways, bridges, flood-control channels, pipelines, and similar civil infrastructure — which often includes large-scale structural concrete. If the concrete is part of a road, bridge, or public-works civil project, that’s typically A-scope; if it’s building-related flatwork, foundations, or site concrete, that’s C-8.
• C-8 vs. D-6 (Concrete-Related Services, a C-61 limited specialty): D-6 is a narrow specialty covering concrete sawing, coring, breaking, gunite application, post-tensioning, concrete pumping service, and installing precast pavers or reusable form sections — but a D-6 contractor is not permitted to form, pour, or place concrete. If you’re actually forming and pouring the concrete, you need C-8; D-6 is for the ancillary services around someone else’s pour.

Who hires a C-8 contractor

Typical C-8 clients include homeowners replacing or adding driveways, patios, and walkways; general contractors and homebuilders subcontracting foundation, footing, and flatwork packages on new construction and ADUs; commercial developers needing tilt-up panels or warehouse floor slabs; pool contractors who need the surrounding deck poured; and municipalities, HOAs, and property managers maintaining curbs, gutters, sidewalks, and parking-lot concrete.

C-8 Concrete FAQ

Can a C-8 contractor build a swimming pool?
No. Pool and spa shell construction requires a separate C-53 Swimming Pool license. A C-8 contractor can pour the concrete decking around a pool, but not the pool structure itself.

Can a C-8 contractor install rebar?
Yes, as part of their own concrete scope — placing reinforcement and embedded items is listed under “Pre-placement Preparation” in the CSLB C-8 study guide. A standalone business that only places or erects reinforcing steel for others, with no forming or pouring, needs a C-50 Reinforcing Steel license instead.

Does C-8 cover asphalt driveways?
No. Asphalt paving falls under C-32 (Parking and Highway Improvement). C-8 is concrete-only.

Can a C-8 contractor apply stucco over a concrete wall?
No. Plaster and stucco coatings require a C-35 Lathing and Plastering license; C-8 explicitly excludes contractors whose sole business is applying plaster coatings.

Do I need a license for a small concrete patch job?
Not necessarily. California’s minor-work exemption, raised by AB 2622 effective September 14, 2024, allows unlicensed work when combined labor and materials total $1,000 or less and no building permit is required. Anything above that (or requiring a permit) needs a licensed contractor.

Can a C-8 contractor build a concrete block (CMU) wall?
Generally no — concrete masonry unit construction is typically C-29 (Masonry) scope. C-8 covers formed, poured concrete, not unit masonry assembly.

How long does it take to get a C-8 license after passing both exams?
CSLB doesn’t publish a guaranteed timeline; it depends on how quickly your experience is verified, your Live Scan clears, and you submit your bond and workers’-comp documentation. Plan for several weeks to a few months from application to an active license number.

Can my C-8 experience count toward adding a different classification, like B, later?
Sometimes, if the actual duties overlap — CSLB evaluates the specific work performed, not just the classification title, when you apply to add a classification to an existing license.