A C-17 Glazing license is the California Contractors State License Board (CSLB) specialty classification required to select, cut, assemble, fabricate, and install glass, mirrored glass, and glass-substitute materials, along with the frames, panels, sashes, and doors that hold them, in any structure. The classification is codified at 16 CCR §832.17 (authority: Business and Professions Code §§7008 and 7059; reference §§7058 and 7059), and it is one of the more code-dense C-classifications because it blends metal-framing calculations, glass material science, and life-safety glazing rules from the California Building Code (CBC) into a single trade exam.
What a C-17 License Actually Covers
The regulatory text is broad on purpose: a glazing contractor “selects, cuts, assembles and/or installs all makes and kinds of glass, glass work, mirrored glass, and glass substitute materials for glazing; executes the fabrication and glazing of frames, panels, sashes and doors; and/or installs these items in any structure.” In practice, that covers both the glass itself and the metal or vinyl framing systems built to hold it. Real-world C-17 project scopes include:
- Commercial storefront glass systems — fabricating and installing the aluminum-framed glass entry systems on retail strip centers and street-level commercial buildings.
- Curtain wall systems — installing the non-load-bearing glass-and-metal exterior wall assemblies on mid-rise and high-rise commercial buildings, including anchoring, sealing, and thermal-movement detailing.
- Residential window glass replacement — re-glazing sashes and frames after breakage, upgrading single-pane glass to dual-pane insulated units, and replacing failed (fogged) insulated glass units.
- Shower enclosures and mirrors — fabricating and installing frameless and framed shower doors, and cutting/hanging wall mirrors.
- Glass railings and guardrails — installing structural glass balustrades and guardrail infill panels on decks, stairs, and balconies where CBC guardrail-load requirements apply.
- Skylights — fabricating and installing glazed skylight units and their supporting curbs or frames.
Because the definition covers “frames, panels, sashes and doors,” C-17 also picks up the aluminum window and storefront framing that carries the glass — confirmed by CSLB’s own C-17 reference library, which points candidates to the AAMA Curtain Wall Series: Glass and Glazing. Storefront and curtain-wall metal framing isn’t a separate trade layered on top of C-17; it’s built into the classification.
Exam Structure: What CSLB Actually Publishes
CSLB’s official Glazing (C-17) License Examination Study Guide (current edition, effective for exams scheduled on or after April 1, 2023) breaks the trade exam into five content areas with published weightings:
- Planning and Estimating — 27% (evaluating plans and specifications; job-related calculations)
- Fabrication and Installation of Framing Systems — 21% (measurements/calculations, fabrication, and installation of framing)
- Fabrication and Installation of Glazing Materials — 18% (installation of glazing materials, specialty glazing installations, finish work)
- Glazing Replacement and Retrofit Projects — 15%
- Safety — 19% (worker safety and job site safety)
CSLB labels these percentages “approximate.” The exam is closed-book, multiple-choice with four choices per question, written to have one best answer; some questions require calculations and a calculator is provided; there’s no penalty for guessing. The current study guide does not state a specific number of questions or a time limit, so we won’t invent one — confirm current test-day logistics on CSLB’s own candidate materials. Cited references include the current CBC and California Residential Code (Title 24), the AAMA Curtain Wall Series: Glass and Glazing, ASTM’s standard for installing exterior windows/doors/skylights, the GANA Glazing and Sealant Manuals, and Cal/OSHA’s Title 8 safety orders.
Full C-17 Licensing Requirements
- Experience: Four years of journey-level glazing experience, earned within the ten years before you apply. Up to three of those four years can be substituted with education, registered apprenticeship, or technical training, but at least one full year must be hands-on trade experience.
- Contractor’s bond: $25,000, increased from $15,000 effective January 1, 2023 under SB 607.
- Bond of Qualifying Individual (BQI): An additional $25,000 bond when the qualifier is an RME, RMO, or RMM holding less than 10% ownership.
- Fees: A $450 non-refundable application fee, plus an initial license fee of $200 (sole owner) or $350 (any other business type), due after you pass your exam(s); the license renews at the same fee every two years.
- Live Scan fingerprinting: Every individual on the application — owner, officers, partners, and any Responsible Managing Employee — must be fingerprinted for a DOJ/FBI background check once CSLB posts the application.
- Workers’ compensation: C-17 is not on CSLB’s mandatory workers’-comp-insurance list (that list currently covers only C-8, C-20, C-22, C-39, and C-61/D-49). A C-17 licensee with no employees can still file for the no-employee exemption. A broader rule that would have required workers’ comp for every licensee regardless of classification has been pushed back to January 1, 2028 under SB 1455 (2024), which also directs CSLB to build a verification process for exemption claims before that date.
- Unlicensed small-job exemption: Under AB 2622 (effective January 1, 2025), an unlicensed person may perform work up to a $1,000 aggregate contract price (labor, materials, and all costs) without a license, provided no employees are hired and no building permit is required; any advertisement for that work must disclose that the person is not a licensed contractor. This exemption does not apply once a job (or a series of jobs for the same project) crosses the $1,000 threshold.
C-17 vs. Other CSLB Classifications
Glazing sits next to several classifications that get confused with it, so it’s worth drawing the actual lines:
- C-17 vs. C-28 (Lock and Security Equipment): C-28 (16 CCR §832.28) covers doors and door assemblies, gates, locks, panic and fire-rated exit devices, closers, and permanently installed safes and vaults — the hardware controlling access. C-17 covers the glass and the glazing frame itself. A storefront door with a glass panel and a panic exit device typically involves both: the glazier sets the glass and frame (C-17), while the hardware and exit device are C-28.
- C-17 vs. B (General Building): A B contractor can take a prime contract requiring at least two unrelated building trades (not counting framing or carpentry as one of those two). A B contractor can only do standalone glazing work if it also holds C-17; B alone doesn’t authorize a glazing-only subcontract outside a qualifying multi-trade project.
- C-17 vs. C-51 (Structural Steel): C-51 covers fabrication/erection of structural steel used as a building’s load-bearing members, plus related riveting, welding, and rigging. That’s a different scope from the non-structural framing that carries a curtain wall or storefront glazing system, which sits inside C-17’s own “Fabrication and Installation of Framing Systems” area. Steel holding up the building is C-51; metal framing built to hold glass is C-17.
Who Needs a C-17 License?
The C-17 classification is the right fit for:
- Commercial storefront and curtain-wall installation companies working on retail centers, office buildings, and mixed-use construction.
- Residential window and glass replacement companies handling re-glazing, insulated-glass-unit replacement, and sash repair.
- Shower door, mirror, and glass-fixture installers serving remodeling contractors and homeowners directly.
- Glass railing and guardrail specialists working on decks, stairways, and balconies.
- Skylight installation and glazed-roof specialty firms.
Frequently Asked Questions
Is a C-17 license the same as a window installation license?
Not exactly. C-17 covers the glass and its glazing frame. If a job is a full window unit replacement that also involves siding, stucco, or structural framing repair beyond the glazing itself, other classifications (or a B General Building qualifier) may also be involved depending on scope.
Does C-17 cover storefront door hardware like panic bars and closers?
No. Panic and fire-rated exit devices, closers, and locking hardware fall under C-28 (Lock and Security Equipment) per 16 CCR §832.28. C-17 covers the glass and the surrounding glazed door frame or panel.
How many years of experience do I need for a C-17 license?
Four years of journey-level glazing experience within the prior ten years, up to three of which can come from education or registered apprenticeship — but at least one year must be hands-on.
How much is the C-17 contractor’s bond?
$25,000, the statewide contractor’s license bond amount under SB 607 (effective 1/1/2023). A separate $25,000 Bond of Qualifying Individual applies if your qualifier is an RME, RMO, or RMM with under 10% ownership.
Does a C-17 contractor need workers’ compensation insurance?
C-17 isn’t on CSLB’s mandatory workers’-comp list (C-8, C-20, C-22, C-39, C-61/D-49), so a no-employee exemption is available. A rule requiring comp for every licensee regardless of trade has been delayed to January 1, 2028 under SB 1455.
Can I do small glazing jobs without a C-17 license?
Under AB 2622 (eff. 1/1/2025), an unlicensed person may perform work up to a $1,000 aggregate contract price without a license, provided no employees are hired, no permit is required, and any advertising discloses the lack of a license.
Is curtain wall metal framing part of C-17, or does it need a separate structural license?
It’s part of C-17. The classification’s own scope covers “fabrication and glazing of frames, panels, sashes and doors,” and CSLB’s C-17 reference list includes the AAMA Curtain Wall Series: Glass and Glazing. C-51 Structural Steel is a different scope: fabrication/erection of steel that serves as a building’s structural (load-bearing) members, not the non-structural framing that carries glass.
Ready to see how a C-17 exam question actually reads? Start by confirming glazing is the right fit at Find Your Classification, then work through classification-specific practice material in Exam Prep. If you’re new to the process end-to-end, How It Works walks through the path from study guide to license. Check current course pricing on the Pricing page, and if you’re still not sure C-17 is the right classification for your work, Contact us before you commit to a study plan.