ADU Builders in Palo Alto & the Surrounding Bay Area
Design by M&M is a Palo Alto design-build company specializing in custom ADUs for homeowners across the Bay Area. Whether you’re planning a backyard cottage, converting a garage, or adding an in-law unit, we manage the full process — design, permitting, utilities, and construction — so the new space fits your property, your goals, and your budget. An ADU is one of the most practical ways to add living space, generate rental income, or keep family close without leaving the neighborhood you love.
What Is ADU Construction?
As a Palo Alto ADU builder serving homeowners across the Bay Area, Design by M&M helps you add valuable, flexible living space to your property. An ADU, or accessory dwelling unit, is a self-contained living space built on the same lot as your main home — complete with its own kitchen, bathroom, and entrance.
ADUs have become one of the most popular home investments in the Bay Area, and for good reason. They create expanded living space for a growing or multigenerational family, generate rental income, and add long-term value to your property — all without the cost and disruption of moving. For many homeowners, an ADU is the most practical way to get more out of the land they already own.
There are several types of ADUs, and the right one depends on your lot, your goals, and your budget:
- Detached ADUs and Garden Suites — freestanding units in the backyard, ideal for privacy and rental potential
- Attached ADUs — connected to the existing home, often the most efficient use of space and utilities
- Garage conversions — transforming an underused garage into a fully functional living unit
- In-Law Suites and Junior ADUs — smaller units designed to keep family close and comfortable
Whichever direction makes sense for your property, we manage the full process — design, permitting, utilities, and construction — so the finished space fits seamlessly with your home.
Our ADU Construction Services
Building an ADU in Palo Alto is a major project, and as your ADU builder, we guide you through every step. From your first consultation to the final walkthrough, our design-build team manages the entire accessory dwelling unit process — design, permitting, utility connections, and construction — so you never have to coordinate between separate designers, architects, and contractors on your own.
Every property is different, which is why we start by understanding your goals and what your lot can support. Whether you’re creating more space for family, exploring new housing options on your property, or building a unit for rental income, we help you choose the right type of ADU and design it to fit your home, your budget, and how you actually plan to use it.
Below are the ADU services we offer Palo Alto and Bay Area homeowners.
Garage Conversions
Convert the Garages into complete living units.
Backyard & Cottage ADUs
Construct detached structures that have all the amenities.
In-Law Suites and Granny Flats
Family members can live comfortably.
Prefab & Modular ADUs
Rapid, low priced, and individualized units.
One & Two-Bedroom Units
Customized to your property and lifestyle.
Complete-Service Project management
Design, permitting, construction, and finishing, done in a professional manner.
Why Choose Design & Construction by M&M
Building an accessory dwelling unit takes more than construction skill — it takes a team that understands design, permitting, and the details that make a space work. As a design-build contractor, we manage your entire ADU project under one roof, combining thoughtful design with precise construction so the process stays clear and coordinated from start to finish.
We know the Bay Area, and we know how local ADU regulations, lot conditions, and permitting requirements shape what’s possible on your property. That experience means fewer surprises and a smoother path from concept to completion. Whether you’re planning a detached backyard unit or a custom ADU in Palo Alto, we focus on quality materials, careful craftsmanship, and steady communication at every stage — delivering a space that’s practical, well-built, and made to last.
About us
Want to know more about us? Over many years of work, Design & Construction by M&M has built a reputation for innovative design and quality craftsmanship across the Bay Area. As a design-build company, we bring design and construction together under one roof, so building an ADU stays clear, coordinated, and tailored to each homeowner from start to finish.
As an experienced ADU builder, we help homeowners create practical, attractive accessory dwelling units that add real long-term value. We understand how local zoning and permitting rules shape what your property can support, and we guide you through the details — from a backyard garage conversion to a fully custom unit built around your needs. Customization is at the heart of what we do, whether you’re planning an ADU or working with us as your home addition contractor on a larger project. From the first idea to the final walkthrough, we’re committed to attention to detail, quality, and a process built around you.
Design in 3 simple steps
Consult & Design
We start with a thorough consultation, creating custom designs tailored to your style and needs.
Expert Construction
Our skilled team manages every detail, from demolition to installation, ensuring precision and quality.
Enjoyment
We complete your project with meticulous attention, ensuring your complete satisfaction and a stunning new kitchen.
Area We Serve: San Francisco | Palo Alto | Menlo Park | Atherton | Mountain View | Sunnyvale | Los Altos Hills | Belmont | Redwood City | San Mateo | Pacifica | Hillsborough | San Carlos | Woodside | Portola Valley | Saratoga | Los Gatos | Cupertino | San Jose | Santa Clara | Daly City | San Bruno | Millbrae | Burlingame | Los Altos | Campbell | Fremont | Milpitas | Brisbane |foster City
Request a Free Estimate Today
Ready to start your project? Contact Design & Construction by M&M for a free consultation and quote. Let us bring your vision to life!
Start Your Project with Us
Ready to build, remodel, or expand? Fill out the form and our team will be in touch to discuss next steps.
Straightforward, professional, and on your terms.
- 100 South Murphy Ave STE 200 Sunnyvale CA 94086
- +1 (650) 899-8968
- 50 California St, San Francisco, CA 94111
- +1 (650) 269-1376
- design@designbymm.pro
License number #1082131