ADU Construction in Campbell, CA
Professional ADU construction services in Campbell, CA. Get a free quote from a licensed contractor with 15+ years of experience. Call (408) 629-4047.
Professional ADU Construction Services in Campbell, CA
Attached, Detached, Conversions & More
Campbell homeowners are increasingly turning to accessory dwelling units as a practical way to add living space, generate rental income, and increase property value. Whether you need a detached backyard unit near the Pruneyard or a garage conversion in the San Tomas neighborhood, Animas Valley Construction delivers ADU construction solutions tailored to your property, your budget, and Campbell’s specific building requirements.
As a licensed general contractor (CA License #1027294) with over 15 years of residential construction experience in Santa Clara County, we understand the unique challenges and opportunities that come with building an ADU in Campbell. From navigating the City of Campbell’s Community Development Department permitting process to managing utility connections and final inspections, our team handles every phase of your project so you can focus on the end result — a fully functional living space that adds lasting value to your home.
Campbell’s ADU-friendly regulations make this one of the most accessible cities in the South Bay for homeowners looking to build. The city permits ADUs across all residential zones with no minimum lot size requirements, no additional parking mandates, and a streamlined 60-day ministerial approval process. According to the City of Campbell’s ADU standards, detached units can reach up to 1,200 square feet with just four-foot side and rear setbacks — meaning most single-family lots in Campbell have the room to support a well-designed ADU.
Whether you’re building a studio unit to house an aging parent, a two-bedroom rental to offset your mortgage, or converting your garage into a modern living space, our experienced construction team brings the expertise to turn your vision into reality. We invite you to request a free consultation and discover what’s possible on your Campbell property.
Types of ADUs We Build in Campbell
Detached ADUs
A detached ADU is a standalone structure built separately from your primary residence, offering maximum privacy for both occupants. These units can be up to 1,200 square feet and are ideal for homeowners who want a fully independent living space with its own entrance, kitchen, and bathroom.
Attached ADUs
An attached ADU is added directly onto your existing home, sharing at least one wall with the primary residence. This option is often more cost-effective because it leverages your home’s existing foundation and utility connections.
Garage Conversion ADUs
A garage conversion transforms your existing attached or detached garage into a habitable dwelling unit. Because the foundation, walls, and roof are already in place, this is often the most cost-effective path to an ADU — and Campbell does not require you to build a replacement garage.
Junior ADUs (JADUs)
A Junior ADU is a compact unit of 500 square feet or less created entirely within your home’s existing footprint, typically from a spare bedroom. JADUs require a private exterior entrance and an efficiency kitchen, making them an accessible entry point for homeowners on a tighter budget.
Above-Garage ADUs
Building an ADU above an existing or new garage lets you preserve your parking and storage while adding a complete living unit on the second level. This configuration is especially popular in Campbell neighborhoods where homeowners want to retain driveway functionality while maximizing their property’s potential.
Two-Story ADUs
Repurpose existing interior space — such as a basement, bonus room, or underused portion of your home — into an independent living unit. Conversion ADUs require proper egress, ventilation, and independent access but can be one of the fastest and most affordable paths to adding an ADU.
Request an ADU Construction Consultation in Campbell, CA
Free Consultations
Ready to explore what an ADU can do for your Campbell property? Our team provides complimentary on-site consultations where we assess your lot, review setback and zoning requirements, and walk you through design options that align with your goals and budget. Whether you’re in the early planning stages or ready to break ground, we’re here to guide you through every step of the process. Fill out the form to get started.
- Phone: 408-629-4047
- Email: [email protected]
- Office Hours: Monday – Friday, 8:00 AM – 5:00 PM
- Address: 5361 Armonk Court, San Jose, CA 95123
- License #: 1027294
About Animas Valley Construction
Top Construction Company in Campbell
Animas Valley Construction is a San Jose-based general contractor founded and led by owner Daniel Zaragoza, who brings over 15 years of hands-on residential construction experience to every project. Since expanding into ADU construction in 2023, we’ve helped homeowners across Santa Clara County add value, space, and functionality to their properties. As a fully licensed and insured firm, we manage every detail — from design consultation and permitting through construction and final inspection — so our clients experience a seamless, stress-free build. Explore our completed projects in our portfolio.
What Our Clients Say
I found Daniel, the owner, through recommendations from two neighbors who were extremely satisfied with his remodeling work. I also highly recommend Daniel. He completed my two-bathroom remodel beyond my expectations, both technically and aesthetically. The project passed all required city inspections and stayed on budget, all while my family remained in the home throughout the construction.
L. V.
Yelp ReviewWe had a fantastic experience with Animas Construction! They updated our living room, kitchen, family room, and bathroom — and we couldn’t be happier with the results. Daniel was incredibly supportive and attentive throughout the entire process. He really listened to our ideas and offered thoughtful suggestions to help improve our living spaces. We were also amazed at how efficiently Daniel and his team worked, completing everything on time without compromising quality. Their professionalism stood out, and they made sure to clean up thoroughly at the end of each day. Highly recommend Animas Construction!
Delia Besio
Google ReviewI contacted Daniel to remodel our Master bedroom…. Daniel showed up on time and gave us an honest and sincere evaluation to the project we had in mind. We are definitely pleased with his input to our concerns and we are executing his recommendations one phase at a time and we are at phase 2 out of 3. I will certainly provide another review when we are done with phase 3 … let me just say for now that so far so GOOD. So thank you Daniel Animas.
Miguel Dabliz
Google ReviewServing Campbell Neighborhoods and Nearby Cities
Animas Valley Construction proudly serves homeowners throughout Campbell, including those in Downtown Campbell, the Pruneyard and Dry Creek area, Ainsley Park, San Tomas, Hacienda, and the Capri neighborhood. Each of these communities has its own architectural character, and we design ADUs that complement the existing home and surrounding streetscape.
Our service area extends well beyond Campbell. We also provide ADU construction, kitchen remodeling, bathroom remodeling, and home addition services to homeowners in neighboring cities, including:
No matter where you’re located in the South Bay, our team brings the same level of professionalism, craftsmanship, and attention to detail to every ADU project we build.
Additional Construction Resources for Campbell
Top Construction Company in Campbell
Structural Changes: Moving Walls During Your Campbell Gut Remodel
The Homeowner’s Guide to ADU Requirements in Campbell
Frequently Asked Questions About ADU Construction in Campbell
ADU construction costs in Campbell typically range from approximately $150,000 for a garage conversion to $450,000 or more for a larger custom detached unit, depending on the size, design complexity, and site conditions. We provide detailed, transparent estimates during your free consultation so you know exactly what to expect before committing to a project.
Yes, all ADU projects in Campbell require a building permit issued by the City of Campbell Community Development Department. California law mandates that the city process complete ADU applications within 60 days through a ministerial (non-discretionary) approval process, which means no public hearings are required for code-compliant projects.
Absolutely. California state law allows homeowners to build one detached ADU and one JADU on the same single-family lot. This means you could add up to two additional living units to your Campbell property, maximizing both rental income potential and long-term property value.
Detached ADUs in Campbell require a minimum four-foot setback from side and rear property lines, consistent with California state law. Garage conversions that maintain the existing building footprint do not require any additional setbacks, making them one of the most flexible ADU options for properties with limited yard space.
Most ADU projects in Campbell take between six and twelve months from initial design through completion, depending on the scope of work and permit review timelines. Garage conversions and JADUs tend to move faster, while custom detached ADUs with complex site work may take closer to a year.
The ADU itself will be assessed as new construction and receive its own tax basis, but your existing home's Proposition 13 assessment remains unaffected. Only the value of the new ADU is added to your property tax bill — your primary home's assessed value does not change as a result of the ADU project.
Yes. California law suspended local owner-occupancy requirements for standard ADUs, meaning you can rent out your ADU regardless of whether you live in the primary residence. Campbell also does not impose additional parking requirements for ADU tenants, making it straightforward to offer your unit as a rental to supplement your income.
