California ADU Experts — From Permits to Keys
Turn your backyard into a revenue-generating asset or create space for your growing family. Our ADU specialists handle everything from site assessment to Certificate of Occupancy. #1101759.
From detached new builds to garage conversions, we're the ADU experts homeowners trust for permit-ready designs, code-compliant construction, and on-time delivery.
General Contractor License # 1101759
From foundation to Certificate of Occupancy, we manage the entire ADU construction process. Our team includes architects, structural engineers, and skilled tradespeople who work together to deliver your project on time and on budget.
Great guys to work with and still get them to do my home improvement
Leo and his team were great! They did high-quality work and communicated well during our bathroom remodel. They know how to do everything and we love the finished result. They are kind and respectful and do not cut corners!
I wish I could fully express how wonderful our experience with Generation Builders actually was. Luis was our main contact point, he was quick to answer any questions. Everything was addressed no hesitation. I highly recommend using Generation Builders.
Amazing Partner, very punctual, High Quality.
Generation Builders really came through for us - we decided to remodel our guest bathroom with just over 2 weeks before our guests arrived. David provided a prompt quote, got a team started the very next day, and oversaw every detail to make sure nothing got missed.
Leo and his crew did an attached ADU, and overhaul/refresh of our house (interior to exterior refresh- repaint, lighting, stucco, concrete work etc) which was a massive undertaking.
Generation Builder's was referred by our architect, and it was one of the best decisions. We interviewed 7 other contractors and we went with Leonardo and his team.
Jimmy and his team helped me renovate my house. It took a little time at the beginning to fine-tune our communication, but once we aligned, everything went smoothly.
We interviewed several construction companies for our bathroom remodel, and when we met David from Generation Builders USA, we knew we had found the right company.
Half our kitchen cabinets had to be ripped out because of a water leak. Pedro and Alex restored it and made it look just like new in 1-1/2 days. We highly recommend Generation Builders.
Generation builders is one of the best contractors we could have worked with... we did a home remodel in 2023 when our younger son was all of 1m old. We had to move out of the house for the duration.
I wanted to renovate my unfinished ground floor space in my outer sunset home to create a home office and additional living space. Generation Builders gave me a great quote and delivered excellent work.
The first thing that attracted us to Generation Builders was their name and company logo... what we discovered was a treasure of craftsmanship, knowledge, and professionalism.
I would like to thank Pedro who managed a demolition project for us. We had an old dilapidated ADU inherited from a previous homeowner and it needed to come down.
Generation Builders does good and timely work. We are very happy with the tile work and plumbing in our new bathroom. Their pricing is right on with a promise to deliver.
Just wanted to drop a quick note to express my gratitude towards Generation Builders. I hired them last year for my new house construction, and they've been nothing short of amazing.
I highly recommend this company as they did an excellent job remodeling my house.
I definitely recommend! Congratulations guys, I will see you in our next project! Thank for your great ideas.
Generation Builders came to my house today to replace a skylight. They were on time and did a fantastic job. They were very efficient and did a very thorough job.
Leonardo is always very responsive and with great customer service, very organized and always ready to help, plus the quality and how beautiful the 3D design they create.
Very professional. Thank you very much, we are very happy with the service!
It was with some trepidation when we made the commitment to remodel our entire house. Have always heard the nightmare of stories of sporadic appearances by contractors, but Generation Builders proved us wrong.
Mr. Leonardo is an incredible person, he solved all the problems in my house, during the renovation everything was clean and isolated, I would recommend this company to everyone.
I highly recommend this construction company for their exceptional workmanship and attention to detail. Their team is professional, efficient, and dedicated to delivering high-quality results.
Best contractor in many ways. Prompt, courteous, professional, attention to details, job well done. looknofurther. This is it.
I highly recommend this company as they did an excellent job remodeling my house.
Great team, very professional and dedicated to quality work.
Excellent service and outstanding results. Highly recommend Generation Builders for any construction or remodeling project.
Who we are ↘
We don't just build ADUs — we help homeowners make smart investment decisions. Our team evaluates your property's potential, designs for maximum value, and builds with the quality that commands premium rental rates in the San Francisco San Francisco Bay Area market.
Leonardo Silva
Founder & Licensed Contractor
General Contractor License # 1101759
Building an ADU involves more regulatory steps than a typical remodel. Our streamlined four-step process handles the complexity so you don't have to — from initial feasibility to handing you the keys.
We evaluate your property in Warm Springs, check zoning, setbacks, and utility connections to determine the best ADU configuration.
Architectural plans, structural engineering, Title 24 energy compliance, and permit submission to Fremont — we handle it all.
Foundation, framing, plumbing, electrical, HVAC, and finishes. Our crews build efficiently with minimal disruption to your daily life.
We coordinate all Alameda County inspections, obtain your Certificate of Occupancy, and hand you the keys to your new ADU.
Local Expertise
Why Warm Springs, Fremont is one of the San Francisco Bay Area's top ADU markets
Warm Springs is a newer Fremont neighborhood near the BART station, featuring 1980s homes and newer developments. The area's housing stock is reaching renovation age, with homeowners updating kitchens and bathrooms to modern standards.
Fremont homeowners are increasingly turning to ADU construction as a way to generate rental income, house family members, or create dedicated workspace. California's streamlined ADU laws have made the process more accessible than ever, and our team handles every step from site assessment to Certificate of Occupancy.
The Bay Area is experiencing an ADU boom, and for good reason. New state laws have eliminated many of the barriers that previously made ADU construction difficult. We stay current on every legislative update so your project moves forward without bureaucratic roadblocks.
California now allows homeowners to build both an ADU and a Junior ADU (JADU) on a single-family lot — no special use permit required in most Alameda County cities.
Detached ADUs up to 1,200 sq ft are allowed. Minimum 4-foot rear and side setbacks. We design to maximize your buildable area in Warm Springs.
If your property in Warm Springs, Fremont is within half a mile of public transit, no additional parking is required for your ADU.
Cities must approve or deny ADU permits within 60 days. We prepare permit-ready plans that sail through Fremont's review process.
A standalone structure in your backyard — up to 1,200 sq ft with full kitchen, bathroom, and separate entrance. Ideal for rental income or multigenerational living.
An addition connected to your existing home. Shares a wall but has its own private entrance, kitchen, and bathroom. Cost-effective and faster to build.
Transform your underused garage into a fully permitted living space. One of the most affordable ADU options in Warm Springs, Fremont — no new foundation needed.
Up to 500 sq ft carved from existing space in your home. Requires only a small efficiency kitchen. Build a JADU plus a full ADU on the same lot.
ADU construction costs in Warm Springs, Fremont vary depending on size, type, site conditions, and finish level. Garage conversions are generally more affordable than detached new builds. We provide free site assessments and detailed estimates — call (650) 278-8674.
From permit submission to Certificate of Occupancy, ADU construction in Warm Springs, Fremont typically takes 6–12 months. Garage conversions can be faster. We front-load the permitting process to minimize delays.
Most single-family lots in Warm Springs, Fremont qualify for at least one ADU under California state law. We offer free site assessments to evaluate your specific property's potential, setbacks, and utility connections.
Rental income from ADUs in Alameda County depends on size, location, and finishes. Well-built units in desirable neighborhoods command strong rents in the San Francisco San Francisco Bay Area market. Many homeowners recoup their investment through rental income over time.
