C-9 — Drywall

A California C-9 Drywall license lets a contractor sign a prime contract to install, tape, texture, and finish gypsum wallboard systems — including the metal framing that carries them — on any residential or commercial job. It’s a CSLB specialty license, earned by passing two exams (the C-9 trade exam plus the Law & Business exam) and documenting at least four years of qualifying drywall experience. It covers the full drywall scope end to end — layout, hanging, taping, and texture — not just one piece of it.

What a C-9 license actually covers

Per California Code of Regulations, Title 16, Section 832.09, a C-9 contractor “lays out and installs gypsum wall board and gypsum wall board assemblies including nonstructural metal framing members, and performs the taping and texturing operations including the application of compounds that adhere to wall board to produce a continuous smooth or textured surface.” In practice, that scope shows up on real jobs as:

• New-construction wallboard hanging — laying out and screwing standard 1/2″ and 5/8″ gypsum board to wood or metal studs on a new single-family home or tract build.
• Fire-rated and sound-rated assemblies — installing UL-listed multi-layer wallboard and resilient channel systems between units in an apartment or condo project to meet Title 24 fire and sound separation requirements.
• Nonstructural metal framing for tenant improvements — building out interior metal-stud partition walls and soffits for a commercial office or retail buildout, then boarding over them.
• Textured and level-5 finishes — mixing and applying joint compounds, skim-coating, and matching orange-peel, knockdown, or smooth level-5 finishes to pass a designer’s or architect’s punch list.
• Suspended and specialty ceiling assemblies — hanging drywall ceilings, soffits, and curved or coffered assemblies that require layout beyond a flat wall.
• Water- and impact-damage repair — cutting out and patching wallboard after a plumbing leak or drywall puncture, then re-taping and texturing to blend with the existing surface.

What it does not cover: exterior stucco or plaster coatings, spray-applied insulation, or acoustical ceiling tile systems — those fall under other classifications discussed below.

The C-9 exam, section by section

Every CSLB applicant sits two separate exams: the Law & Business exam (required for every classification) and the C-9 trade exam. Both are computer-based, closed-book, multiple-choice, and administered by PSI on CSLB’s behalf. CSLB’s official candidate FAQ confirms you’re given 3.5 hours to complete each exam, and that calculators are provided where math is required — you cannot bring your own. There’s no penalty for guessing, so an unanswered question is always a wrong answer.

CSLB does not publicly publish the exact number of scored questions or the numeric passing score for the C-9 exam — candidates who fail get a section-by-section breakdown, while candidates who pass see only “Pass,” per CSLB’s own exam FAQ. Treat any site quoting an exact question count or passing percentage for this classification as unverified.

What CSLB does publish, in the official C-9 study guide (edition for exams scheduled on or after December 1, 2025), is the content weighting across five major sections:

• Installation and Repair — 32% (installing ceiling assemblies, standard wallboard assemblies, fire-rated assemblies, specialty assemblies, trims, and repairing damaged drywall)
• Planning and Estimating — 18% (reviewing plans and specifications, estimating project costs, evaluating material specifications)
• Finishing — 17% (selecting and mixing compounds, selecting level of finish, taping, coating, sanding/sponging, and texturing surfaces)
• Safety — 19% (personnel and job site safety procedures, tool and equipment operation, work at elevated heights)
• Preparation, Framing, and Layout — 14% (evaluating job site readiness, managing materials, laying out assembly types, installing metal framing and backing)

CSLB notes these percentages are approximate. Installation/Repair and Safety together make up roughly half the exam, which is why hands-on assembly knowledge and jobsite safety procedures deserve the heaviest study time.

What it takes to qualify

To sit for the C-9 exam, CSLB requires at least four years of journey-level experience in drywall work within the last 10 years — as a journeyman, foreman, supervising employee, contractor, or owner-builder. Up to three of those four years can be substituted with related education, technical training, or a registered apprenticeship program, but CSLB requires at least one year to be actual hands-on practical experience — education alone can’t cover the full four years.

The application path is the same structure as any CSLB classification:

1. File the Application for Original Contractor’s License with CSLB, documenting your qualifying experience (and your qualifier’s role if applying under a business entity).
2. Pay the nonrefundable $450 application processing fee.
3. Get fingerprinted (Live Scan) for the required background check.
4. Sit for and pass both the C-9 trade exam and the Law & Business exam.
5. Submit your $25,000 contractor’s bond (the statewide bond amount set by SB 607, effective since 2023) and proof of workers’ compensation coverage or an exemption.
6. Pay the initial license fee — $200 for a sole owner license, $350 for all other business types — to have the license issued.

On workers’ compensation: C-9 is not on CSLB’s short list of classifications required to carry active coverage regardless of employee count (that list is limited to C-8, C-20, C-22, C-39, and C-61/D-49). A sole-owner C-9 contractor with no employees can file a workers’ comp exemption certification with CSLB — though SB 216 and its 2024 extension (SB 1455) phase in a universal requirement for all CSLB licensees by January 1, 2028. See our full step-by-step application guide and current fee and bond breakdown for the numbers that apply across every classification.

C-9 vs. the classifications people confuse it with

C-9 Drywall vs. C-35 Lathing and Plastering. Both install metal framing/lath and finish wall and ceiling surfaces, so they’re easy to confuse. The dividing line is the finish material: C-9 covers gypsum wallboard — a manufactured panel you hang, tape, and texture with joint compound; C-35 covers wet-applied plaster and stucco, troweled or sprayed directly onto lath. Hanging and finishing drywall panels needs C-9; troweled or sprayed plaster/stucco coatings need C-35. Some contractors hold both.

C-9 Drywall vs. C-2 Insulation and Acoustical. C-2 covers installing insulating media and preformed architectural acoustical materials for temperature and sound control — acoustic ceiling tile, batt or blown insulation, acoustical wall panels. C-9 can frame and board around those systems, but installing the acoustical tile or insulation media itself is C-2’s scope. A soundproof studio wall typically needs C-9 for the framing/board and either a C-2 sub or dual licensure for the insulation and panel work.

C-9 Drywall vs. B General Building. A Class B contractor can take a prime contract on a project needing at least two unrelated trades, so a B license can run a remodel that includes drywall as one piece of a larger scope. But framing/carpentry doesn’t count toward that “two unrelated trades” test, and CSLB restricts B contractors from taking single-trade prime contracts outside framing or carpentry. Standalone drywall work — hang, tape, texture, or repair with no other trade involved — needs C-9, not B.

Who actually needs a C-9 license

The C-9 license is built for specialty drywall and metal-framing subcontractors: crews that bid tenant-improvement buildouts for commercial general contractors, multifamily framing-and-board packages for apartment developers, new-home wallboard packages for production builders, and standalone repair/texture-matching work for homeowners and property managers. It’s also the right license for a solo finisher who wants to legally contract directly with homeowners for patch, texture, and paint-prep work above the $500 owner-builder exemption threshold, rather than working only as an unlicensed sub under someone else’s license.

C-9 Drywall FAQ

Do I need a C-9 license just to patch a small hole in drywall?
Only above CSLB’s $500 handyman exemption threshold, or if you’re advertising drywall repair as a business — below that, and without advertising, no license is required.

Can a C-9 contractor install metal stud framing on its own, without any drywall?
Yes — Section 832.09 explicitly includes “nonstructural metal framing members” in the C-9 scope, so framing a wall system is within C-9’s authority even before the board goes up.

Does C-9 cover exterior stucco?
No. Stucco and plaster coatings fall under C-35 Lathing and Plastering, even though both trades install metal lath/framing as a base.

Can I use my drywall apprenticeship to shorten the four-year experience requirement?
Yes, up to three of the four required years — but CSLB still requires at least one year of documented practical, hands-on experience.

Is the C-9 trade exam harder than the Law & Business exam?
CSLB doesn’t publish comparative difficulty or exact passing scores. What is published is content weighting: Installation and Repair (32%) and Safety (19%) carry the most weight, so prioritize those.

Do I need workers’ comp insurance to get a C-9 license if I don’t have employees?
Not immediately. C-9 isn’t on CSLB’s mandatory-coverage list, so a sole owner with no employees can file an exemption — though SB 216/SB 1455 phase in universal workers’ comp for all CSLB licensees by January 1, 2028.

Can a C-9 contractor bid directly on a fire-rated wall assembly for an apartment building?
Yes — fire-rated wallboard assemblies are explicitly part of the C-9 exam’s Installation and Repair section, so no separate classification is needed for that scope.