Quick Answer: California’s Contractors State License Board (CSLB) issues three main categories of licenses: Class A (General Engineering Contractor) for large civil engineering projects like highways, bridges, and utilities; Class B (General Building Contractor) for construction of structures requiring more than two unrelated building trades — the license needed for most residential remodeling, additions, and ADU projects; and Class C (Specialty Contractor) with 42 sub-classifications for specific trades like C-8 (concrete), C-10 (electrical), C-20 (HVAC), C-36 (plumbing), C-39 (roofing), and C-33 (painting). For a kitchen remodel, bathroom addition, ADU, or room addition in San Jose, you want a contractor with a Class B license — which allows them to self-perform multiple trades and subcontract specialized work.
CSLB License Classifications for Residential Remodeling — California 2025
| License Class | Who It Covers | What They Can Do |
|---|---|---|
| A — General Engineering | Civil/structural engineers, infrastructure contractors | Highways, bridges, grading, utilities — NOT typical home remodeling |
| B — General Building | General contractors for multi-trade work | Full home renovation, additions, ADUs, kitchen/bath remodels — anything requiring 2+ trades |
| C-8 Concrete | Concrete flatwork and foundation specialists | Foundations, slabs, driveways, retaining walls |
| C-10 Electrical | Licensed electricians | All residential and commercial electrical work |
| C-20 HVAC | HVAC contractors | Heating, ventilation, air conditioning installation and service |
| C-33 Painting | Painting contractors | Residential and commercial interior and exterior painting |
| C-35 Lathing/Plastering | Stucco and plaster contractors | Stucco, plaster, lath installation |
| C-36 Plumbing | Licensed plumbers | All residential and commercial plumbing work |
| C-39 Roofing | Roofing contractors | Residential and commercial roof installation and repair |
| C-54 Ceramic/Mosaic Tile | Tile contractors | Tile installation (floor, wall, shower) |
Quartz Construction holds a Class B General Building Contractor license (CSLB #1003436). We self-perform framing, drywall, tile, and finish carpentry, and subcontract with licensed C-10 (electrical), C-36 (plumbing), C-20 (HVAC), and C-39 (roofing) subcontractors on projects requiring those specialty trades. Call (650) 749-7436 for a free estimate.
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4.9 ★ average rating across Google, Yelp, and Houzz from 150+ Bay Area homeowners.
"Quartz Construction did an amazing job on our kitchen remodel. The team was professional, on time, and the results exceeded our expectations. Highly recommend to any Bay Area homeowner!"
— Michael T. |
"We hired them for a bathroom remodel in our San Jose home. From permitting to final walkthrough, everything was handled perfectly. The tile work is stunning. 5 stars without hesitation."
— Sarah L. |
"Just finished our ADU garage conversion. The project came in on budget and on schedule — rare in the Bay Area! The rental income already started. Could not be happier with Quartz Construction."
— David R. |
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Licensed Bay Area contractor — CSLB #1003436 — serving San Jose, Fremont, Oakland, Santa Clara, Sunnyvale and all Bay Area communities.
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Licensed General Contractor • CSLB Lic#1003436 • Serving San Jose, Santa Clara & Bay Area
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Quartz Construction & Remodeling | CSLB #1003436 | Licensed, Bonded & Insured
Phone: (650) 749-7436
Address: 1777 Hamilton Ave #1080, San Jose, CA 95125
Hours: Mon–Sat 7am–7pm | Free Estimates
Service Area: San Jose, Santa Clara, Sunnyvale, Mountain View, Los Gatos & Bay Area
