ADU Construction in Redwood City, CA

Quartz Construction builds accessory dwelling units (ADUs) in Redwood City, CA. Whether you need a detached backyard ADU, a garage conversion, or a junior ADU, our licensed team handles everything — design, permits, and construction. Licensed CSLB #1003436 | BBB A+ | 4.9⭐ (65+ Reviews)

ADU Types We Build in Redwood City

• Detached Backyard ADU — Separate, self-contained unit in your backyard. Ideal for rental income or family member housing.
• Attached ADU — Addition to your existing home with separate entrance and utilities.
• Garage Conversion ADU — Transform your Redwood City garage into a fully permitted living space at lower cost.
• Junior ADU (JADU) — Smaller unit within your existing home structure, permitting often simpler.
• Above-Garage ADU — Second-story unit built over your existing garage.

ADU Cost in Redwood City

ADU construction in Redwood City costs $155,000–$360,000 for a detached ADU. Garage conversions are more affordable at $60,000–$120,000. The high cost of housing in Redwood City means a well-built ADU typically rents for $2,500–$4,500/month, achieving full ROI in 5–8 years.

ADU Permits in Redwood City

California state law (AB 2221, SB 9) allows ADUs on all single-family lots, including in Redwood City. Redwood City has streamlined its ADU permit process in compliance with state mandates. Quartz Construction handles all permitting, engineering, and inspections — you don’t need to navigate City Hall alone.

ADU Rental Income in Redwood City

ADU rental income in Redwood City typically ranges $2,200–$4,000/month depending on size and finishes. With Bay Area rents this high, most Redwood City homeowners recoup their ADU investment within 6–8 years while simultaneously increasing their property value by $200,000–$400,000+.

Get a Free ADU Estimate in Redwood City

Ready to build an ADU in Redwood City? Quartz Construction provides free ADU consultations including site assessment, permit feasibility review, and construction estimate. Call (650) 749-7436 or fill out our contact form. CSLB #1003436 | BBB A+ | Serving Redwood City and all Bay Area cities.