Campbell · Santa Clara County
ADU Design & Build in Campbell, California
Campbell lots tend to be the right size for a meaningful ADU without overwhelming the main house, exactly where our modular system fits cleanly.
Building ADUs in Campbell, California
SHAPE designs and builds accessory dwelling units for homeowners in Campbell, California, across Downtown Campbell, San Tomas, Cambrian Park, Rosemary, and the pocket neighborhoods off Bascom.
Campbell lots are the sweet spot: big enough for a real 800–1,200 sq ft ADU without crowding the main house, and close enough to downtown and light rail that renters pay a premium.
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 Campbell building department.
Campbell ADU Rules at a Glance
- Setbacks: California state law caps rear and side setbacks for new ADUs at 4 feet, and Campbell 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: Campbell permits detached ADUs up to 1,200 sq ft and follows California ADU law for ministerial review.
- 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 Campbell lots.
SHAPE handles the full permit package with the Campbell 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 Campbell 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 Campbell.
- 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 Campbell?
- 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 Campbell depends on size, finishes, utilities, access, and site conditions.
- How long do permits take in Campbell?
- California law requires ministerial ADU review within 60 days of a complete submittal. Real-world timelines in Campbell typically run 2–4 months including corrections. SHAPE manages every submittal and response with the Campbell planning department.
- Do I need to add parking for an ADU in Campbell?
- 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 Campbell.
- What size ADU can I build in Campbell?
- Campbell permits detached ADUs up to 1,200 sq ft and follows California ADU law for ministerial review. 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 Campbell?
- Yes. California state law allows long-term (30+ day) rentals of ADUs statewide. Short-term rentals are set by the city, Campbell, 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 Campbell 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.
