Room Addition in San Mateo, CA | Quartz Construction
Room Addition Contractor in San Mateo, CA
Need to add space to your San Mateo home? Quartz Construction builds custom room additions in San Mateo โ bedroom additions, master suites, family rooms, sunrooms, and second-story additions. We handle engineering, permits, and construction from start to finish.
Room Addition Services in San Mateo
Industry Resources & Standards:
- Bedroom Addition โ Add a guest bedroom, in-law suite, or extra bedroom
- Master Suite Addition โ Expand your master bedroom with walk-in closet and bathroom
- Family Room Addition โ Add an open family room, great room, or living space
- Second Story Addition โ Add a full or partial second floor to your home
- Sunroom Addition โ Glass-enclosed sunrooms and four-season rooms
- Garage Conversion โ Convert your garage into living space
- Above-Garage Addition โ Build a loft or apartment above your existing garage
- Home Office Addition โ Dedicated home office with soundproofing and high-speed wiring
Room Addition Cost in San Mateo
Room additions in San Mateo typically cost $90,000โ$220,000. The price ranges from $150โ$300+ per sq ft, depending on the complexity, foundation type, and finishes. A simple 200 sq ft bedroom addition starts around $40,000. A master suite with bathroom runs $100,000โ$200,000. Quartz Construction provides free addition estimates for all San Mateo homeowners.
Get a Free Room Addition Estimate in San Mateo
Ready to add space to your San Mateo home? Call Quartz Construction at (650) 749-7436. CSLB #1003436 | BBB A+ | 4.9โญ. Serving San Mateo and all Bay Area cities.
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Professional Resources & Regulations
- California Contractors State License Board (CSLB) — Verify contractor licenses
- City of San Jose Building Permits — Permit requirements & inspections
- ENERGY STAR — Energy-efficient materials & standards
Trusted by San Jose Homeowners
4.9/5.0 • 65+ Google Reviews
“Amazing kitchen remodel โ on time, on budget. Highly recommend Quartz Construction!”
โ Maria S., San Jose
“Professional, communicative, and the bathroom renovation exceeded expectations.”
โ David L., Santa Clara
“Built our ADU from scratch โ permits, foundation, everything handled seamlessly.”
โ Jennifer T., Sunnyvale
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