FOR IMMEDIATE RELEASE
San Jose, CA — July 2026
Quartz Construction & Remodeling (CSLB #1003436), a licensed San Jose general contractor, has completed over 50 Accessory Dwelling Unit (ADU) construction projects across Silicon Valley, establishing itself as one of Santa Clara County’s most experienced ADU builders. With California’s housing crisis driving record demand for ADU construction, the company has expanded its dedicated ADU division to serve homeowners seeking to add rental income, multigenerational housing, or additional space to their properties.
ADU Demand Surges as California Law Streamlines Approvals
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California’s ADU reform legislation — including SB 9, AB 68, and local San Jose ADU programs — has dramatically reduced permitting barriers since 2020. San Jose’s ADU Accelerated Program and Santa Clara County’s streamlined review process have made ADU construction faster and more affordable than at any point in the past decade.
“We’ve seen ADU inquiries triple over the past two years,” said a company representative. “Bay Area homeowners are discovering that ADUs can generate $1,500 to $3,500 per month in rental income — offsetting mortgage payments significantly while adding permanent value to their property.”
Types of ADUs Built by Quartz Construction
- Detached ADUs — Standalone structures in the backyard, 400–1,200 sq ft, from $150,000–$300,000
- Garage Conversion ADUs — Converting existing garages to livable space, from $80,000–$150,000
- Attached ADUs — Extensions to the main home with private entry, from $120,000–$250,000
- Junior ADUs (JADUs) — Up to 500 sq ft carved from existing home space, from $50,000–$120,000
Full-Service ADU Process
Quartz Construction manages the complete ADU process from initial consultation through final inspection: site assessment and feasibility analysis, architectural design and engineering drawings, city/county permit applications, site preparation and foundation work, framing, electrical, plumbing, HVAC, insulation, drywall, flooring, kitchen and bathroom installation, final inspections, and certificate of occupancy.
ADU Return on Investment in the Bay Area
ADUs in San Jose and Silicon Valley represent one of the highest-return real estate investments available to homeowners. A $200,000 ADU generating $2,500/month in rent produces an annual return of approximately 15% on investment. In addition, ADUs typically increase overall property value by 20–35%, according to real estate analysis for the Bay Area market.
For income tax purposes, ADU rental income may qualify for deductions on mortgage interest, depreciation, insurance, and maintenance expenses, further improving the financial case for ADU construction.
About Quartz Construction & Remodeling
Quartz Construction & Remodeling is a California-licensed general contractor (CSLB #1003436) headquartered in San Jose, California. Serving the Bay Area since 2006 with kitchen remodeling, bathroom renovation, ADU construction, full home renovation, deck building, room additions, roofing, and hardscaping. BBB A+ rated with 4.9-star Google reviews from 65+ verified customers.
Contact:
Quartz Construction & Remodeling
1777 Hamilton Avenue #1080, San Jose, CA 95125
Phone: (650) 749-7436
Website: quartzconstructionremodeling.com/adu-construction
Related Services & Resources
ADU Construction • Backyard ADU • Garage Conversions • ADU Permitting • Room Additions • Full Home Renovation • Get a Free Estimate
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Frequently Asked Questions
ADU construction in San Jose typically costs $150,000–$400,000+ depending on type: detached ADUs average $200,000–$350,000; garage conversions run $80,000–$150,000; and attached ADUs cost $100,000–$200,000. Quartz Construction & Remodeling provides free ADU feasibility assessments.
San Jose follows California ADU law: property owners can build one ADU and one Junior ADU (JADU) per lot. ADUs must meet setback, height, and lot coverage requirements. Quartz Construction & Remodeling navigates all ADU permitting with the City of San Jose Building Department.
From permit approval to move-in, ADU construction in San Jose typically takes 6–12 months. The city’s ADU streamlined permit process takes 30–90 days. Quartz Construction & Remodeling has completed over 50 ADU projects in the Bay Area.
Yes, ADUs in San Jose can be rented to long-term tenants at market rate. Rental income from ADUs averages $2,500–$4,000/month in San Jose, offering an excellent ROI. Consult a tax professional for rental income reporting requirements.
A guest house and ADU are functionally similar — both are secondary living units on a property. Legally in California, ‘ADU’ (Accessory Dwelling Unit) is the official term. ADUs must be permitted and meet building codes; informal guest houses without permits may not be legally rentable.
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Licensed General Contractor • CSLB Lic#1003436 • Serving San Jose, Santa Clara & Bay Area
