Room Addition Contractor in Walnut Creek, CA

Need to add space to your Walnut Creek home? Quartz Construction builds custom room additions in Walnut Creek — 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 Walnut Creek

• Bedroom Addition — Add a guest bedroom, in-law suite, or extra bedroom
• Master Suite Addition — Expand your master bedroom with walk-in closet and bathroom
• Family Room Addition — Add an open family room, great room, or living space
• Second Story Addition — Add a full or partial second floor to your home
• Sunroom Addition — Glass-enclosed sunrooms and four-season rooms
• Garage Conversion — Convert your garage into living space
• Above-Garage Addition — Build a loft or apartment above your existing garage
• Home Office Addition — Dedicated home office with soundproofing and high-speed wiring

Room Addition Cost in Walnut Creek

Room additions in Walnut Creek typically cost $85,000–$210,000. The price ranges from $150–$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 $100,000–$200,000. Quartz Construction provides free addition estimates for all Walnut Creek homeowners.

Get a Free Room Addition Estimate in Walnut Creek

Ready to add space to your Walnut Creek home? Call Quartz Construction at (650) 749-7436. CSLB #1003436 | BBB A+ | 4.9⭐. Serving Walnut Creek and all Bay Area cities.