ADU Builder Campbell
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Campbell, CA?
Keep Your Family Close with a Custom ADU
Whether you want to create a comfortable space for aging parents, independent living for adult children, or a guest house for extended family, ADU Builders Group is your trusted ADU builder in Campbell, California.
With over 20 years of experience, we specialize in designing and constructing high-quality, custom-built ADUs that strengthen family bonds, enhance multigenerational living, and improve your lifestyle while ensuring compliance with local building regulations.
Build with Peace of Mind
We are the only ADU company in Campbell that offers a three (3) years project warranty on our services with complementary annual project inspection. All of this on top of the ten (10) years warranty on structural components.
✔ 3 Years Project Warranty
✔ Complimentary Annual Inspection
✔ 10 Years Structural Warranty
Why Choose Us?
1. Peace of Mind with Industry-Leading Warranties
✅ 3 Years Project Warranty – We stand by our craftsmanship, ensuring any issues within the first three years are addressed promptly and professionally.
✅ Free Annual Inspection – Our commitment to quality extends beyond project completion, we provide a free annual inspection, for the first three years after project completion, to ensure your ADU remains in excellent condition.
✅ 10 Years Structural Warranty – Our ADUs are built to last, and we back them with a decade-long structural warranty, giving you confidence in the longevity of your investment.
2. Expert Guidance & Hassle-Free Process
✅ Permitting & Compliance Experts – Navigating Campbell’s ADU regulations can be complex, but our experienced team ensures a smooth approval process, handling all paperwork and city requirements to prevent costly delays.
✅ 20+ Years of Construction Expertise – With decades of expertise in the construction industry and a dedicated focus on ADUs for over five years, we bring the knowledge, efficiency, and craftsmanship necessary to deliver high-quality results every time.
✅ Fast & Efficient Construction – Our streamlined process and skilled project management ensure your ADU is completed on time without unnecessary disruptions to your daily life.
3. Superior Craftsmanship & Custom Designs
✅ Aging-in-Place & Accessibility Features – Our ADUs are designed with the future in mind, incorporating accessibility features such as wider doorways, step-free entrances, and senior-friendly layouts for long-term convenience.
✅ Tailored Solutions for Every Home – Every family’s needs are unique, which is why we create custom ADU designs that maximize space efficiency, match your home’s aesthetics, and fit your lifestyle.
✅ High-Quality Materials & Precision Engineering – We use only top-tier materials sourced from our trusted, high-quality suppliers, ensuring that your ADU is durable, safe, and built to last for generations.
4. A Lifestyle Solution for Your Family's Needs
✅ Keep Loved Ones Close – Give elderly parents or adult children a private yet nearby living space, ensuring family members stay connected while maintaining their independence.
✅ Multigenerational Living Made Easy – Whether it's providing a comfortable home for aging parents or giving young adults a head start, our ADUs foster a supportive and practical living arrangement.
✅ Enhance Your Home’s Functionality – More than just extra space, an ADU can serve as a dedicated home office, personal gym, creative studio, or even a guest house for visiting relatives and friends.
About Us
Partners and Affiliations
ADU Builders Group Inc.
ADU Builders Group is a local, family-owned company dedicated to providing innovative solutions to California’s housing crisis, with passion for helping multigenerational families. Having high regards to family-oriented values, our work reflects a deep commitment to creating practical, high-quality custom ADUs that bring loved ones closer while respecting privacy and independence. With heart, craftsmanship, and a focus on community, we build homes that inspire and unite.
✔ Proudly Local
✔ Family-Owned
✔ Licensed and Insured
A Partner & Sister-Company of
Imagine Unique Remodels
Our Services and Expertise
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What's The Best Type of ADU for You?
Our Process
Consult with our ADU Experts
1
To start, discuss your needs, goals, and vision for your ADU with our experts. Start by having a phone consultation with us at (408) 413-3373. We'll set your schedule for the in-person meeting during the call. You'll receive expert recommendations and estimate for your ADU during the consultation phase at no cost.
2
Design with our Architect
Need to customize your ADU based on your needs and requirements? Design your own ADU and turn your ideas into an architectural plan with our Architect.
4
Construct & Pass Inspections
Our Project Managers will be in constant communication with you during construction and will ensure that your projects pass all inspections.
3
Obtain Permits Effortlessly
Our Liaison Officer will take care of the permits for you and work with the city to ensure that all paperworks are in place quickly and efficiently.
5
Enjoy and Maintain your ADU
Live the lifestyle you want and be worry-free. We'll continue to provide support and care to your project with our warranties and annual project inspection.
Local ADU Regulations in Campbell
Below is a general overview of ADU regulations in Campbell. If you need more details on how these rules apply to your property, reach out to us to speak with an ADU expert.
Where ADUs Are Allowed
ADUs are typically permitted on properties designated for residential use, though some exceptions may apply. Your property must include an existing or planned single-family home or a multi-family residential building, such as a duplex, triplex, or apartment complex. Contact us to determine whether your property qualifies for an ADU.
Minimum Lot Size
There are no minimum lot size requirements—any property can be eligible for an ADU regardless of its size.
Number of ADUs Permitted
Single-family properties are generally allowed to have one or two ADUs. Multi-family properties may be eligible for multiple ADUs, depending on the number of existing units and the type of ADU being built. Get in touch with us to find out how many ADUs your property can accommodate.
Parking Requirements
Conversion and junior ADUs generally do not require additional parking. However, attached and detached ADUs typically need at least one parking space unless the project qualifies for an exemption. Reach out to us for expert advice on ADU parking regulations.
Featured Project
ADU Builder Campbell FAQs
How long does it take to build a small second unit in Campbell?
The full process typically takes 8 to 12 months, including 1–2 months for design and planning, 2–4 months for permit approval, and 4–6 months for construction. Projects with unique layouts or lots may take longer due to additional reviews or upgrades.
What does it cost to build a backyard cottage in Campbell?
Construction costs generally fall between $450 and $475 per square foot. A 750 sq. ft. in-law suite may start around $340,000, while larger or more custom-built units can exceed $475,000. Be sure to budget for permits, utility adjustments, and landscaping.
Can the compact home share utilities with the main house?
Yes. Most small secondary units can connect to the existing water, sewer, and electrical systems. If the space will be rented out, you might consider installing separate meters. For older properties, electrical panel upgrades are sometimes required to meet capacity needs.
Are there incentives for building sustainably?
Yes. Homeowners in Campbell may be eligible for BayREN energy efficiency rebates, solar panel programs, and EV charger incentives. All new construction must meet California Title 24 energy standards, and homes under 750 sq. ft. are generally exempt from impact fees.
Why are homeowners adding in-law units or compact dwellings?
These smaller homes offer a flexible solution for housing family members, generating rental income, or creating a private office or guest space. They’re especially popular for those looking to stay in place while expanding their property’s function.
Is there strong local interest in secondary homes?
Yes. As housing costs rise and space becomes more valuable, many Campbell residents are building garage conversions, garden cottages, or standalone suites to meet the needs of multigenerational living or passive income.
What types of designs are trending in Campbell?
Popular layouts include modern bungalows, Craftsman-inspired studios, and converted garages with features like open floor plans, energy-efficient fixtures, large windows, and private entrances. Detached structures offer privacy, while conversions can be more budget-friendly.
Where can I find local information on planning and permits?
The City of Campbell’s Planning Division provides resources online, including zoning maps, permit guides, and design standards. You can also schedule a pre-application meeting to get help with lot-specific questions.
Will a small second home change the character of my neighborhood?
Not likely. Campbell has regulations for setbacks, height, and architectural style to ensure new units blend with existing homes. These compact additions support gentle housing growth without disrupting neighborhood appeal.
Do I need to provide additional parking?
Not always. If your new space is within ½ mile of public transit or part of a converted structure, no extra parking is required. In other cases, one off-street parking space may be needed based on city requirements.
Service Areas
Want to build your own ADU but don't know how to start?
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By requesting a callback using our form.