Sunnyvale · Santa Clara County
ADU Design & Build in Sunnyvale, California
Sunnyvale's mix of mid-century ranches and newer lots is well-matched to a modular ADU built in months, not years.
Building ADUs in Sunnyvale, California
SHAPE designs and builds accessory dwelling units for homeowners in Sunnyvale, California, across Heritage District, Cherry Chase, Ortega Park, Ponderosa, Birdland, and the Lakewood Village area.
Sunnyvale's mid-century ranches sit on lots big enough for meaningful ADUs, and the city's tech-worker rental base, from LinkedIn to Juniper to Apollo, keeps demand strong year-round.
We're a licensed California general contractor (CSLB #1158688) with an in-house architecture and modular construction team. That means one contract, one fixed price, and one team responsible from the first site walk through final inspection with the Sunnyvale building department.
Sunnyvale ADU Rules at a Glance
- Setbacks: California state law caps rear and side setbacks for new ADUs at 4 feet, and Sunnyvale follows that standard.
- Height: Detached ADUs are generally allowed up to 16 feet, or up to 18–25 feet on lots that meet transit or multi-story criteria under state law.
- Maximum size: Sunnyvale follows California ADU law and allows detached ADUs up to 1,200 sq ft with ministerial 60-day review on a complete submittal.
- JADUs: Junior ADUs (up to 500 sq ft) are allowed inside the existing footprint of the primary home, in addition to a detached ADU on most single-family lots.
- Parking: No replacement parking is required when an ADU is built within one half-mile of public transit, which covers most Sunnyvale lots.
SHAPE handles the full permit package with the Sunnyvale planning department, zoning verification, building plans, Title 24 energy, and every correction cycle, so you don't have to learn the code.
Our Process
- Site assessment. We walk your Sunnyvale lot, confirm setbacks and utility locations, and give you a feasibility read and an all-in price the same week.
- Design. Our in-house architects design the ADU around your lot, your family, and your budget, with fixed pricing before you sign.
- Permits. We submit, respond to every planning and building comment, and drive the file to permit issuance with Sunnyvale.
- Build. Modules are fabricated in our facility while site work, foundation, utilities, landscaping, runs in parallel. Set and finish happen on site.
Frequently asked
- How much does an ADU cost in Sunnyvale?
- SHAPE's published prices start at $223,000 for Model 1, $263,000 for Model 2, and $343,000 for Model 2X on a typical lot. The final fixed quote in Sunnyvale depends on size, finishes, utilities, access, and site conditions.
- How long do permits take in Sunnyvale?
- California law requires ministerial ADU review within 60 days of a complete submittal. Real-world timelines in Sunnyvale typically run 2–4 months including corrections. SHAPE manages every submittal and response with the Sunnyvale planning department.
- Do I need to add parking for an ADU in Sunnyvale?
- In most cases, no. California state law waives ADU parking requirements when the unit is within a half-mile of public transit, which covers most single-family lots in Sunnyvale.
- What size ADU can I build in Sunnyvale?
- Sunnyvale follows California ADU law and allows detached ADUs up to 1,200 sq ft with ministerial 60-day review on a complete submittal. On top of local rules, California state law guarantees at least 800 sq ft on most single-family lots regardless of local FAR limits.
- Can I rent out an ADU in Sunnyvale?
- Yes. California state law allows long-term (30+ day) rentals of ADUs statewide. Short-term rentals are set by the city, Sunnyvale, like most Bay Area jurisdictions, restricts or prohibits stays under 30 days.
Nearby cities we serve
Get a Free Site Assessment
Tell us about your Sunnyvale lot and what you'd like to build. We'll walk the property, confirm feasibility, and come back with a fixed all-in price, no obligation.
