ADU Builder Piedmont
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Piedmont, 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 Piedmont, 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 Piedmont 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 Piedmont
Below is an overview of ADU regulations in Piedmont. If you need more details about how these rules apply to your property, contact us to get connected with an ADU expert.
Where ADUs Are Allowed
ADUs are generally permitted on residentially zoned properties, though exceptions may apply. Your property must have an existing or planned single-family home or a multi-family building, such as a duplex, triplex, or apartment complex. Reach out to us to determine if your property qualifies for an ADU.
Minimum Lot Size
There are no minimum lot size restrictions—any property, regardless of its size, may qualify for an ADU.
Number of ADUs Allowed
Most single-family homes can accommodate 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 constructed. Get in touch with our team to find out how many ADUs your property can support.
Parking Requirements
Conversion and junior ADUs generally do not require additional parking. However, attached and detached ADUs typically require at least one parking space unless an exemption applies. Reach out to us for expert guidance on Piedmont’s ADU parking regulations.
Featured Project
ADU Builder Piedmont FAQs
How long does it take to build a small home addition in Piedmont?
Most projects take around 9 to 14 months, including design and planning (2–3 months), permit review (3–5 months), and construction (4–6 months). Piedmont’s emphasis on architectural consistency and neighborhood character may extend timelines, especially for homes in historic or hillside areas.
What’s the cost of adding a backyard cottage in Piedmont?
The cost to build a secondary living space here typically ranges from $500 to $550 per square foot, due to high-end design standards and premium materials. A 750 sq. ft. in-law suite may start at $400,000, with larger detached structures exceeding $600,000, especially if significant site work or luxury finishes are included.
Can the new unit share utilities with the main home?
Yes, in most cases. These compact homes can use existing water, sewer, and electrical systems, although some homeowners choose to install separate meters—particularly for rentals or guest quarters. Older properties may need electrical or plumbing upgrades to meet safety codes.
Are there incentives for energy-efficient or sustainable construction?
Yes. Piedmont residents have access to BayREN rebates, solar installation programs, and EV charger incentives. All new dwellings must meet California Title 24 energy efficiency requirements, and homes under 750 sq. ft. are typically exempt from local impact fees.
Why are more homeowners adding in-law units or guest houses?
Smaller secondary homes offer flexible space for extended family, live-in caregivers, private offices, or long-term guests. In a city like Piedmont—where larger renovations can be restricted—these homes are a discreet and effective way to expand living options.
Is there strong demand for these types of dwellings in Piedmont?
Yes, especially among families looking for multi-generational living arrangements, aging-in-place options, or rental income. With limited housing availability and a high cost of entry, adding a granny flat or guest house is an increasingly popular solution.
What styles work best with Piedmont’s architecture?
Homeowners often choose traditional or transitional designs that match the main house, such as shingle-style cottages, Mediterranean-inspired units, or classic Craftsman studios. Features like vaulted ceilings, detailed trim, and quality materials help maintain architectural continuity.
Where can I get help understanding local rules?
The City of Piedmont Planning Division offers zoning information, permitting checklists, and design review guidelines online. Staff are also available to answer questions or schedule pre-application meetings to walk you through the process.
Will adding a second unit change the character of the neighborhood?
No—Piedmont has strict design standards to ensure any new construction, including secondary suites, fits within the scale, style, and quality of the surrounding homes. This keeps neighborhood aesthetics intact while allowing for modest increases in housing flexibility.
Do I need to provide additional parking for a guest suite?
In most cases, one off-street parking space is required for a detached unit. However, if the new space is within ½ mile of public transit or replaces an existing garage, no extra parking may be needed, depending on local exemptions.
Service Areas
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