--- title: "ADU Builder Los Angeles: Design, Permits, Build | Maingreen" description: "ADU builder in Los Angeles for backyard ADUs, garage conversions and room additions: 2D and 3D designs, the permits and the build. Free estimate." url: "https://maingreenconstruction.com/adu-builder/" updated: "2026-10-27" --- # ADU Builder in Los Angeles Maingreen Remodel & Construction is an ADU builder in Los Angeles for backyard ADUs, garage conversions and room additions: we design them with 2D and 3D renderings, apply for the permits and build the finished unit, as one licensed contractor (License #1093329). BACKYARD ADUS, GARAGE CONVERSIONS AND ROOM ADDITIONS - Backyard ADUs - Garage conversions - Room additions - 2D and 3D designs and the permits [FREE ESTIMATE](https://maingreenconstruction.com/contact-us/) Crew applying stucco to the walls of a new backyard ADU ## **More living space on the lot you already own** An accessory dwelling unit (ADU) is a second, smaller home on the same lot: a new building in the backyard, a unit attached to the house, or a garage turned into living space. Families use them for parents or grown children, for a home office, or as a rental. We design and build them, from the first plans to the finished unit. [GET ESTIMATED NOW](https://maingreenconstruction.com/contact-us/) ## The kinds of ADU we build From plans and permits to the finished unit Which kind fits depends on your lot, your budget and how the space will be used. ### **Backyard ADU** A separate small home in the backyard with its own entrance, kitchen and bathroom, built from the foundation up. ### **Room addition** New rooms built onto the house, such as a bedroom suite, that stay part of the home. ### **Garage conversion** An existing garage turned into living space, reusing its walls, roof and slab where they are sound. ### **Design first** Whichever kind you choose, you see it in 2D and 3D renderings before construction starts. ## Before you design: what decides your ADU Before anyone picks a floor plan, the lot and the house shape the options: - Where it can goThe open space in the yard, the distance to the property lines and the existing house, and access for building materials decide between a new backyard unit, an addition or a conversion. - UtilitiesWater, sewer and electrical lines have to reach the unit. How far they run, and whether the main electrical system can carry another kitchen and bathroom, is part of the plan. - The garage, if you have oneA garage conversion reuses the existing structure. - How it will be usedA unit for a parent, a home office or a rental needs different layouts, entrances and kitchens. The use shapes the design from the start. ## Plans and permits You see the unit first in 2D and 3D renderings, and we never start construction until you approve of the design. We apply for all the permits your home improvement project requires well before construction. Related work we also do: [foundation](https://maingreenconstruction.com/foundation/) repair, [plumbing](https://maingreenconstruction.com/plumbing/), [electrical](https://maingreenconstruction.com/energy-efficient-electric/) and [roofing](https://maingreenconstruction.com/roofing-contractor-los-angeles-ca/). ## What sets the cost of an ADU - **Type:** a garage conversion reuses an existing structure; a new backyard unit is built from the foundation up. - **Size and layout:** the number of rooms, and whether it has a full kitchen and bathroom. - **Site work:** grading, foundation and how far the utility lines run. - **Finishes:** flooring, cabinets, fixtures and windows. - **Outside:** the path, patio or [pavers](https://maingreenconstruction.com/concrete-pavers/) and [landscaping](https://maingreenconstruction.com/landscape/) around the new unit. The estimate is free and starts with a visit to the lot. [Get a free ADU estimate](https://maingreenconstruction.com/contact-us/) ## How does it work? The Maingreen Remodel & Construction ADU Process **Step 1** – Call us for a free estimate; we visit to see the lot or the garage and talk through what you want. **Step 2** – We prepare the design, with 2D and 3D renderings; construction never starts until you approve it. **Step 3** – We apply for the permits the project requires before construction. **Step 4**– We build the unit, from the foundation or the conversion to the final finishes. [TALK WITH AN EXPERT NOW](https://maingreenconstruction.com/contact-us/) ## Selected ADU and addition projects ADU and additions in Sherman OaksADU and additionsADU and additions in Sherman OaksSherman OaksView project →ADU and additions in InglewoodADU and additionsADU and additions in InglewoodInglewoodView project → [See more projects →](https://maingreenconstruction.com/about/) ## What ADU customers say [Google](https://www.google.com/maps/search/?api=1&query=Maingreen+Remodel+%26+Construction+Los+Angeles) > "We recently Maingreen Construction& remodeling for a major project ADU and we couldn’t be more pleased with the results." Read the full review → A**Andrew Nachshon Dzedulionis** [Google](https://www.google.com/maps/search/?api=1&query=Maingreen+Remodel+%26+Construction+Los+Angeles) > "Maingreen done an awesome job on our house ,Matthew and the team done great adu in our back yard , the results are beyond amazing,we so greatly appreciate we have lovey place to accommodate our family" Read the full review → W**Wang Weiwei** ## ******Rest Assured. Working with us is a GREAT decision.****** With hundreds of happy customers, we know you will be satisfied with our work, our friendliness and our attention to detail. We are dedicated to making your dream home remodel a positive experience. ### FREE CONSULTATIONS We offer free energy efficient consultations with one of our certified experts. We come to you at your earliest convenience. ### HONESTY We value honesty in life and business. ### LICENSED Maingreen Remodel & Construction is licensed and insured. ### PROTECTION With rising energy costs, we can help you protect your spending and increase the value of your home. ### TRANSPARENCY We work with you every step of the way. We provide clear outlines on the scope of work necessary to meet your dream. ## ADU questions I want to build an ADU in my backyard in Los Angeles. Where do I start?Start with a visit to the lot. The open space, the distance to the lot lines and where the water, sewer and electrical lines are shape what kind of unit fits. From there we prepare the design with 2D and 3D renderings, apply for the permits and build it.Garage conversion or a new backyard ADU?A conversion reuses the garage's walls, roof and slab when they are sound. A new backyard unit is built from the foundation up. The visit shows which fits your lot.Do you handle the plans and the permits?Yes. You see the design in 2D and 3D, we never start construction until you approve of it, and we apply for all the permits the project requires.Do you build room additions too?Yes. A room addition, such as a bedroom suite, follows the same steps: design, permits and construction, by the same contractor. See our [remodeling](https://maingreenconstruction.com/remodeling/) work as well.Which areas do you serve?Los Angeles and nearby cities including Burbank, Glendale, Pasadena, Culver City, Inglewood, Torrance, Long Beach, Whittier, Santa Clarita, Palmdale and Lancaster.