Add space without moving. Quartz Construction builds room additions in San Jose CA with smart planning, cohesive design, and quality construction. Contact our team to schedule a consultation.

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Room Additions in San Jose CA | Quartz Construction

home remodeling San Jose CA results and outcomes in Hayward by Quartz Construction
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Quick Answer: Room additions in San Jose cost $200–$400 per square foot. A 400 sq ft bedroom addition runs $80,000–$160,000. Permits are required. Quartz Construction (CSLB #1003436) manages design, permits, and construction. Free estimate: (650) 749-7436.

Watch Our Remodeling Projects in the Bay Area

See the quality craftsmanship of Quartz Construction & Remodeling through these project videos, showcasing completed remodeling work for Bay Area homeowners.

https://www.youtube.com/watch?v=WvBD2Qk0VQk
https://www.youtube.com/watch?v=hNk04itKQq4

Ready to transform your home? Quartz Construction & Remodeling serves San Jose, Mountain View, Palo Alto, Los Altos, Los Gatos, Sunnyvale, and all Bay Area cities. Contact us today for a free estimate. License CSLB #1003436 | (650) 749-7436


Watch: Bay Area Remodeling Insights

Expert tips and real project walkthroughs to help you plan your Bay Area home improvement.

What Our Bay Area Clients Say

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.  | 

Read all reviews on Google →


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Licensed Bay Area contractor — CSLB #1003436 — serving San Jose, Fremont, Oakland, Santa Clara, Sunnyvale and all Bay Area communities.

Call: (650) 749-7436

    Get a Free Estimate from Quartz Construction

    Licensed General Contractor • CSLB Lic#1003436 • Serving San Jose, Santa Clara & Bay Area

      Quartz is a construction and remodeling company serving San Jose and the nearby areas. Our firm offers a wide range of services, including full-home renovations, kitchen remodeling, bathroom renovations, window replacement, deck building and repair, patio construction, and more.


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      Location

      Address: 1777 Hamilton Avenue #1080, San Jose, 95125 California, USA.

      Mon-Sat: 08:00 – 19:00

      © 2025 Quartz Construction and Remodeling, San Jose, California.

      🔑 CSLB License: #1003436 ↗ Verify|🏆 BBB: A+ Accredited ↗|4.9/565+ Google Reviews ↗|📞 (650) 749-7436