With California’s updated ADU laws making approval faster and easier than ever, adding a high-quality ADU instantly increases your home’s value, creates reliable rental income, and provides flexible space for family members, guests, or a private home office.
While ADUs offer homeowners rental income potential and contribute to alleviating the state’s housing shortage, many hesitate due to high initial costs. The CalHFA ADU Grant provides up to $40,000 to cover pre-development and one-time closing costs for ADU construction. This grant can help with essential pre-development expenses like site preparation, architectural plans, permits, soil testing, impact fees, property surveys, and energy assessments.
We keep our clients informed at every stage, providing clear guidance and open communication throughout the process.
We uphold the highest ethical standards, always doing what's right for our clients, team, and community.
We take pride in our craftsmanship, using the best materials and techniques to build spaces that last.
We are dedicated to providing a seamless, stress-free process, ensuring our clients feel valued and heard from start to finish.
Alela WallsTrustindex verifies that the original source of the review is Google. First builders inc are the best ! Ariel was amazing he was very professional and delivered top quality work . My results exceeded my expectations. I recommend them 10/10 Sun H LeeTrustindex verifies that the original source of the review is Google. I had a great experience working with First Builders Inc on our backyard and bathroom remodel. Ariel, the project manager, was exceptional, very organized, responsive, and always kept us informed throughout the entire process. Communication was clear and consistent, which made everything feel smooth and stress-free. The workmanship really stood out. The quality, attention to detail, and overall finish exceeded our expectations. Both the backyard and bathroom came out beautifully. Highly recommend First Builders Inc and Ariel if you’re looking for a reliable team that delivers top-quality work. Terry PattonTrustindex verifies that the original source of the review is Google. Can't thank David and Ariel enough for helping me get my bathroom remodeled. I originally reached out to get my flooring done. I was so happy with how the floor turned out that I called them back to have my bathroom remodeled. The whole process was seamless from start to finish and would highly recommend them to all my friends and family! Joe SindicichTrustindex verifies that the original source of the review is Google. I was scared to replace our roof. Adam and David were fantastic. They kept us updated on every step. Their crew did a great job. Me and my wife are very happy. MICHELLE ATrustindex verifies that the original source of the review is Google. My husband and I live in Encino and hired First Builders for a home addition plus a full remodel of our kitchen, bathrooms, windows and painting . The team was professional , reliable and great at communicating. Quality craftsmanship, no games and a beautiful final result. Very happy we chose them !! shelly vaughnTrustindex verifies that the original source of the review is Google. I can’t thank Ariel and his team enough for all their hard work and expertise with my remodel. When we first met Ariel to discuss remodeling our bathroom we did not expect that our bathroom could be transformed into such a beautiful new bathroom. Truly thankful to the First Builders team for assisting me with getting the bathroom remodeled! Thank you guys! Miki BornTrustindex verifies that the original source of the review is Google. Very good experience remodelling my kitchen and bathroom with First Builders. David was very responsive to requests and issues and the team delivered good quality of work. Only thing is we didn't have enough tiles ordered in the first time so had to wait extra time for additional ones to arrive. The outcome in the end looks awesome and they are very attentive to details. They are NOT the cheapest quote I got but the service is worth the premium. Denise EutseyTrustindex verifies that the original source of the review is Google. I just want to take a moment to thank Ariel and his team for their hard work and expertise. When I first reached out to Ariel about getting new flooring in my bedrooms, Ariel guided me through the process and provided me with several options that were within my budget. I could not be happier with the overall experience and final result. Thank you Ariel! Gayane MkrTrustindex verifies that the original source of the review is Google. We built a 900 sqft detached ADU in our backyard with vaulted ceiling, beautiful custom cabinets, white oak floors and upgraded windows and doors. Our architect recommended Ariel , he was absolutely incredible. We couldn’t be happier with our decision. Highly recommended!! Daniel ChavezTrustindex verifies that the original source of the review is Google. Have nothing but good things to say about this company! First of all, they are super responsive and helpful which was very important for me while seeking a contractor because I know how many details are involved in renovating a house. Secondly, they work FAST. These guys don’t play around. If you want to remodel your home don’t hesitate twice and go for it. Ariel is a sweetheart and it shows that he knows what he is doing/talking about. A real professional in the full sense of the word.
Our ADU process starts with expert planning, whether from a garage or backyard space. We collaborate with you on customized layouts and blueprints for your studio, one-, or two-bedroom unit, then handle all permits and ensure full code compliance with complete transparency.
Compact ADUs demand smart, personalized design. Our in-house team optimizes every square foot with stylish layouts, efficient storage, natural light, and premium finishes, creating a beautiful, functional space that perfectly matches your lifestyle and vision.
At First Builders Inc., our family-owned team delivers superior craftsmanship on every project. We manage construction from foundation to final details, partnering with trusted vendors for top-quality materials and finishes that ensure your ADU is built to last.
Building an Accessory Dwelling Unit (ADU), often called a granny flat, in-law suite, or backyard cottage, is one of the smartest investments you can make in your Southern California property. With California’s updated ADU laws making approval faster and easier than ever, adding a high-quality ADU instantly increases your home’s value, creates reliable rental income, and provides flexible space for family members, guests, or a private home office. At First Builders Inc., we specialize in designing and constructing ADUs that blend seamlessly with your existing home while maximizing livable space and long-term returns.
As a family-owned Los Angeles builder with decades of local experience, we handle every detail with transparency and care, from navigating permits in Los Angeles, Orange County, Santa Barbara, and the Inland Empire to delivering exceptional craftsmanship that stands the test of time. Whether you’re looking to accommodate aging parents, generate passive income, or future-proof your property, our team is committed to turning your vision into a beautiful, code-compliant ADU with minimal stress and maximum value. Let us help you unlock the full potential of your property today.
A garage conversion ADU is a fully independent living unit created by transforming an existing attached or detached garage into a complete home with kitchen, bathroom, and private entrance. California’s ADU laws make garage conversions one of the simplest and most affordable options, and our expert team at First Builders Inc. delivers seamless, code-compliant results with beautiful craftsmanship.
In the Los Angeles area, a typical garage conversion ADU costs $120,000–$250,000 depending on size, finishes, and utility upgrades. This is significantly less than new detached construction. We provide transparent, detailed estimates upfront so you know exactly what to expect with no surprises.
Yes, a building permit is required, but California’s streamlined ADU rules mean approvals are fast and ministerial (usually within 60 days). First Builders Inc. handles the entire permitting process for Los Angeles, Orange County, and surrounding areas, saving you time and stress.
No. Under current California law, garage conversion ADUs are exempt from parking replacement requirements, even if the garage was previously used for parking. This makes conversions especially attractive in space-constrained neighborhoods.
Yes, you can rent it long-term or, where local rules allow, short-term (Airbnb). There is no owner-occupancy requirement for garage conversion ADUs, making them an excellent source of passive rental income. We design and build rental-ready units that attract quality tenants.
Most garage conversion projects take 4–7 months from permit approval to final sign-off, far faster than ground-up construction. Our experienced family-owned team keeps your project on schedule while maintaining the highest standards of quality and communication.
Absolutely. A well-built garage conversion ADU often adds $200,000–$400,000 or more to your home’s value while providing immediate rental income potential. At First Builders Inc., we focus on timeless design and superior construction that maximizes both resale value and daily enjoyment.
Garage conversions typically tie into your home’s existing water, sewer, and electrical systems, which keeps costs lower than new detached units. In many cases, only minor upgrades are required to meet code. At First Builders Inc., our Los Angeles team handles all utility connections seamlessly, ensuring your new ADU is fully independent, energy-efficient, and ready to use without surprises.