ADU Builder Sunnyvale
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Sunnyvale, 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 Sunnyvale, 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 Sunnyvale 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 Sunnyvale'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 Sunnyvale
Below is an overview of ADU regulations in Sunnyvale. If you need more details about how these guidelines apply to your property, reach out to us to connect with an ADU expert.
Where ADUs Are Allowed
ADUs are generally permitted on properties designated for residential use, though some exceptions may apply. To qualify, your property must have an existing or planned single-family home or a multi-family building, such as a duplex, triplex, or apartment complex. Contact us to determine if your property is eligible for an ADU.
Minimum Lot Size
There are no minimum lot size requirements—any property, regardless of its dimensions, may qualify for an ADU.
Number of ADUs Allowed
Single-family homes can typically accommodate one or two ADUs. Multi-family properties may qualify for multiple ADUs, depending on the number of existing units and the type of ADU being constructed. Get in touch with our team to learn how many ADUs your property can support.
Parking Requirements
Conversion and junior ADUs generally do not require additional parking. However, attached and detached ADUs usually need at least one parking space unless an exemption applies. Reach out to us for expert advice on Sunnyvale’s ADU parking requirements.
Featured Project
ADU Builder Sunnyvale FAQs
How long does it take to build a backyard unit or guest cottage in Sunnyvale?
Most projects take around 8 to 12 months from start to finish. This includes 1–2 months for design, 2–4 months for permit processing, and 4–6 months for construction. Timelines can vary based on the complexity of the design, whether you’re building from scratch or converting an existing space.
What’s the average cost to add a secondary dwelling in Sunnyvale?
Construction costs typically range from $450 to $500 per square foot, depending on size, finishes, and site conditions. A 750 sq. ft. in-law suite or granny flat may start at around $340,000, with custom or larger units exceeding $475,000. Additional costs may include permits, utility work, and landscaping.
Can the new home share utilities with the main house?
Yes. It’s common for these small dwellings to connect to existing water, sewer, and electric systems. If you're planning to rent out the unit, separate meters may be a good idea for managing utility use. Electrical panel upgrades may also be needed in older homes.
Are there incentives for energy efficiency or sustainable construction?
Yes. Sunnyvale homeowners can take advantage of BayREN rebates, as well as programs for solar installation, EV charging equipment, and energy-efficient appliances. All new dwellings must meet California’s Title 24 building standards, and units under 750 sq. ft. are typically exempt from local impact fees.
Why are more homeowners building in-law units or backyard cottages?
These additional living spaces provide flexible options for housing family members, guests, or tenants, and are also popular for use as home offices or creative studios. They’re a practical way to expand your living space without having to move.
Is there growing demand for small-scale homes in Sunnyvale?
Yes. With limited housing inventory and high demand, more Sunnyvale homeowners are adding garage conversions, detached garden suites, or compact homes to make the most of their property and meet changing household needs.
What styles and layouts are common locally?
Popular designs include modern studio cottages, mid-century inspired flats, and converted garages with open interiors, natural light, and energy-efficient features. Outdoor elements like private patios or green landscaping are often integrated.
Where can I get help with permits and zoning regulations?
The City of Sunnyvale’s Community Development Department provides resources such as zoning maps, building codes, and permit checklists. You can also schedule a pre-submittal consultation to review your lot’s eligibility and streamline the process.
Will adding a small home affect neighborhood character?
Not significantly. Sunnyvale enforces standards for setbacks, privacy, height, and architectural design to ensure that secondary homes integrate smoothly into existing neighborhoods and maintain a balanced residential feel.
Is additional parking required for a compact second unit?
In many cases, no extra parking is needed if the home is within ½ mile of public transit or if it’s a garage or basement conversion. Otherwise, you may be required to provide one off-street space, depending on the site layout.
Service Areas
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