ADU Builder Monte Sereno
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Monte Sereno, 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 Monte Sereno, 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 Monte Sereno 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 Monte Sereno'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 Monte Sereno
Below is an overview of Monte Sereno’s ADU regulations. If you need more details on how these rules apply to your property, reach out to us to connect with an ADU expert.
Where ADUs Are Allowed
ADUs are typically permitted on residentially zoned properties, but some exceptions may apply. Your property must include 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 qualifies for an ADU.
Minimum Lot Size
There are no minimum lot size restrictions—any property, regardless of its dimensions, may be eligible for an ADU.
Number of ADUs Allowed
Most single-family properties can 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 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 advice on ADU parking requirements in Monte Sereno.
Featured Project
ADU Builder Monte Sereno FAQs
How long does it take to build a guest house or in-law suite in Monte Sereno?
Most projects take around 9 to 14 months from concept to completion. This includes 2–3 months for architectural design and planning, 3–5 months for permits and review, and 4–6 months for construction. Monte Sereno’s emphasis on architectural quality and neighborhood aesthetics can extend the approval process, especially for custom builds.
What’s the average cost to add a secondary dwelling?
Construction costs typically range from $500 to $550 per square foot, reflecting Monte Sereno’s high-quality standards and design expectations. A 750 sq. ft. backyard unit or granny flat may start at $400,000, with larger or fully custom homes exceeding $600,000. Be sure to factor in permit fees, site work, and potential upgrades to utilities or landscaping.
Can the new space share utilities with the main residence?
Yes. Most secondary homes connect to existing water, sewer, and electric lines. For rental purposes or added flexibility, homeowners sometimes install separate meters. In older homes or hillside lots, electrical upgrades or septic assessments may be required.
Are there sustainability or energy-efficiency incentives available?
Yes. Residents can take advantage of BayREN energy rebates, solar panel programs, and EV charger installation incentives. All new construction must meet California Title 24 energy standards, and compact units under 750 sq. ft. are generally exempt from local impact fees.
Why are Monte Sereno homeowners adding small-scale dwellings?
These additional living spaces offer a private solution for extended family, live-in caregivers, or guests. They’re also ideal for those planning for aging in place or creating a flexible home office or art studio—without expanding the main house.
Is there demand for these types of homes in Monte Sereno?
Yes. Many residents are exploring custom guest cottages, converted garages, or detached suites as discreet ways to enhance property value while addressing changing household needs—particularly in a community focused on privacy and elegance.
What styles of design work well in Monte Sereno?
Homeowners often choose Mediterranean, Craftsman, or transitional architecture that complements their main home. Popular features include vaulted ceilings, premium finishes, private patios, and landscaping that blends with the surrounding environment.
Where can I find help with zoning and permits?
The City of Monte Sereno Planning Department offers guidance on design review, zoning regulations, and building permits. A pre-application consultation is highly recommended to confirm feasibility and align your project with local expectations.
Will a small backyard unit impact the neighborhood’s appearance?
Not if designed properly. Monte Sereno enforces strict standards for scale, privacy, height, and architectural integrity to ensure that new construction maintains the area’s residential character. Most additions are designed to blend seamlessly with the main home and neighborhood.
Is parking required for an additional living space?
Generally, one off-street parking space is required. However, if the new unit meets certain state exemptions, such as being located near public transit or replacing a garage, no additional parking may be necessary.
Service Areas
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