ADU Construction
When your property has more potential than it's currently using, an ADU is how you unlock it. We provide ADU construction services in Cupertino, Los Gatos, Saratoga, Sunnyvale, Los Altos, and throughout the Bay Area.
- 10+ years of remodeling experience
- 5-year workmanship warranty
- Full-service, permits to final walkthrough
- Clean jobsite, every day
Scroll down to discover ADU types, our process, and what to expect.
Unused Space on Your Property Is an Opportunity Worth Taking
Most homeowners don’t fully think about what an unused garage or an underused lot could do for their property. An ADU adds rental income, creates space for family without giving up privacy, and increases the long-term value of your home in a market where square footage carries real weight.
Whatever’s driving the decision, building it well is what makes the difference between a space you’re proud of and one you’re constantly apologizing for. We handle the full process, from permits and inspections to foundation, framing, and every finish in between. You stay informed throughout, and we don’t consider the job done until the work meets our own standards.
Add living space that works for your life:
- Garage conversions
- Detached ADUs
- Attached additions
- In-home ADUs
- Granny flats
- Custom ADU builds
This Is What Your Property Can Look Like After a Professional ADU Build
Everything You Want to Know Before You Commit to Building An ADU
Permits are required for every ADU build in California, and how they’re handled matters more than most people realize. A permit pulled incorrectly, or skipped altogether, can create legal headaches when you sell, complicate your insurance, and leave you with a unit that technically can’t be occupied.
We manage the entire permit process as part of every project, including applications, plan submissions, and scheduling every required inspection at the right phase of the build. You don’t need to figure out what the city requires or follow up on anything yourself. We’ve done it before and we take care of it.
For the majority of ADU builds, no. Detached units and garage conversions are entirely separate from your main living space, so day-to-day life at home carries on without much interruption.
Attached additions involve more activity nearby and some shared wall work, but we will walk you through exactly what to expect before we start, so nothing catches you off guard.
Absolutely, and we encourage it. The finishes are what make the space feel like it was built for you rather than built to check a box. We involve you in the selection process for tile, flooring, fixtures, cabinetry, and anything else that shapes how the space looks and feels.
We’ll share what we’d recommend based on experience, but the final call is always yours. Our job is to deliver your vision, and that starts with actually understanding what it is.
Most projects land somewhere between two and three and a half months from breaking ground to handing over the keys. The main variable is permit timeline, which can differ depending on your city or county.
Some move faster than others. We give you a realistic schedule before any work begins, built around your actual project and location, and we tend to come in ahead of it. If something shifts along the way, you’ll know about it right away, not after the fact.
More than most people picture when they first start looking into it. A full ADU build covers site assessment, design coordination, permit applications and approvals, foundation work, framing, electrical, plumbing, city and county inspections at every required phase, exterior finish, roofing, drywall, tile, flooring, and final sign-off.
There are a lot of moving parts and a lot of people who need to show up in the right order. We coordinate all of it so you’re not left managing separate contractors, chasing down an inspector, or trying to figure out what comes next.
Every ADU we build is backed by manufacturer warranties on all installed products, plus a 5-year workmanship warranty on our labor. If something we built or installed isn’t holding up the way it should, we come back and make it right.
The warranty covers defects in workmanship and installation. It doesn’t cover damage from misuse, accidents, or the kind of wear that comes with time and use. But for the work itself, we stand behind it.
Case Studies For ADU Construction In California
600 sq. ft. Detached ADU in Cupertino
- Ground-up ADU construction with full foundation and framing
- Open-concept layout including living area, kitchen, bedroom, and bathroom
- Stucco exterior finish with modern window and door package
- Full kitchen installation with cabinetry, countertops, and appliances
- Electrical, plumbing, HVAC, and insulation systems throughout
- Bathroom build-out including shower, vanity, and plumbing fixtures
- Exterior hardscape improvements including walkway and landscaping
The price for an addition like this would start at $220k, with the most expensive item being the foundation, framing, and structure.
Second-Story Bedroom Addition In Los Altos
- Full second-story addition built above existing structure
- Structural reinforcement of lower level to support new load
- New bedroom layout with vaulted ceilings and exposed beam detail
- Integration with existing floor plan including access to bathroom
- New window installation for natural light and ventilation
- Hardwood flooring installation and full interior finishing
- Electrical, HVAC, and insulation upgrades for comfort and efficiency
Living Room Bump-Out Addition in Sunnyvale
- Bump-out addition extending exterior wall to enlarge living area
- Installation of multiple large windows for natural light and backyard views
- Vaulted ceiling concept to create a more open and airy feel
- Flooring extension to seamlessly match existing interior
- Structural framing and roofline tie-in to integrate with existing home
- Interior finishing including drywall, paint, and trim work
- Updated lighting fixture and electrical adjustments
What Sets Us Apart Isn't Hard to Explain
These are the qualities and standards that shape how every project gets handled, from the first call to the last walkthrough.
A Decade of Experience That Shows in the Details
After 10+ years of running a remodeling company in Texas, owner Miguel brought his experience back to California. He managed everything from garage conversions to 1,200-square-foot additions with multiple rooms.
A Warranty That Means Something
Progress Updates Through CompanyCam
You shouldn’t have to take a day off work to know what’s happening at your property. We use CompanyCam to send real-time photo updates throughout the build. You see what we see, when we see it, without having to ask.
Craftsmanship That Goes All the Way to the Edges
The obvious things are easy to get right. It’s the corners, the transitions, the spots most contractors rush through that separate a good job from a great one. Our high standard applies to flooring, paint, tile grout, and everything in between.
Permits and Inspections Managed Start to Finish
We handle applications, plan submissions, and every required inspection throughout the build. You never have to wonder what the city needs or worry if it was filed on time. We’ve been through the process, and we take ownership of it.
A Process That Keeps You in the Loop, Not in the Dark
We keep your home organized, protected, and treated with care throughout every phase of the build.
1. Collaborate
We walk your property, talk through your goals, and put together a clear scope, material plan, and honest timeline.
2. Work
We manage every phase from permits to final finishes, keep the site clean, and keep you updated throughout.
3. Enjoy
Owner Miguel Built His Reputation the Old-Fashioned Way
Through hard work and dedication to every project, and working with the best brands in the industry.
A Realistic Timeline
You’ll know upfront how long your ADU will take, what permits are needed, and what to expect at every phase. No optimistic numbers to close the deal.
One Point of Contact
Permits, foundation, framing, finishes, they are all coordinated under one roof by owner Miguel. You call one person and get a straight answer.
An ADU Built to Last
We build ADUs to the same standard we’d want in our own homes. From structure to finishes, it will hold up well beyond the five-year warranty that backs it.
Why Choose MA Legacy Remodeling
A Note From The Owner, Miguel Ibarra
Add Space to Your Property With an ADU Built By A Team You Can Trust
(takes 1-2 minutes)