Garage Conversion ADUs

Transform your underutilized garage into a beautiful, functional living space with Modern ADU Builder & Garage Conversions. As Long Beach's premier garage conversion ADUs specialists, we help homeowners unlock hidden potential in their properties through expertly crafted accessory dwelling units that maximize value and functionality.


Garage conversions represent the most cost-effective and efficient ADU option available to Long Beach homeowners. By repurposing existing structures, we minimize construction time and costs while creating versatile spaces that serve countless purposes – from rental income properties to multi-generational living solutions, home offices, or guest accommodations.


Our comprehensive garage conversion process handles everything: structural assessments, architectural design, permit acquisition, construction, and final inspections. We navigate Long Beach's specific ADU regulations and building codes with expertise, ensuring your project progresses smoothly from concept to completion.


Each conversion preserves the exterior aesthetic of your property while transforming interiors into modern, comfortable living spaces complete with kitchens, bathrooms, proper insulation, and all necessary utilities. 


With rising housing costs across Southern California, garage conversion ADUs offer Long Beach homeowners unprecedented opportunities to generate rental income, accommodate family members, or create flexible spaces that evolve with changing needs.


Contact Modern ADU Builder & Garage Conversions today for your complimentary consultation.

Our Construction Process

We ensure a seamless and efficient experience for our clients. Our comprehensive approach covers every aspect, from initial consultations to project completion, ensuring clarity and satisfaction throughout the journey.

  • 1. Initial Consultation

    We start with a detailed consultation to understand your vision and goals for the garage conversion. Our team discusses your needs, preferences, and budget to create a tailored plan. We encourage you to bring ideas, sketches, or inspirations you may have.


    Next, we develop clear design concepts, providing 3D renderings to visualize the final outcome. We focus on maximizing space, functionality, and aesthetics while adhering to local regulations.


  • 2. Project Management and Construction

    Once the design is approved, we move into the project management phase. We assign a dedicated project manager who oversees every step of the construction process. This ensures that timelines are met and any potential issues are addressed promptly.


    Our experienced team manages subcontractors, procurement of materials, and adheres to safety standards throughout construction. We maintain open lines of communication, providing regular updates and being available for any queries.

  • 3. Completion

    We understand that time is of the essence for our clients. After the initial consultation, we provide a detailed timeline outlining each phase of the project. This often includes milestones for design approval, construction starts, and final inspections.


    Typically, a garage conversion project can take anywhere from a few weeks to several months, depending on complexity and desired features.  Upon finishing your ADU, we conduct a thorough walk-through to confirm that everything meets your expectations.

Overview of Garage Conversion ADUs

Garage conversion ADUs offer a practical solution for homeowners in Long Beach looking to increase living space or rental income without the need for extensive new construction. This approach utilizes existing structures, allowing for faster project completion and lower costs.

Benefits of Garage Conversion ADUs

Converting your garage into an accessory dwelling unit offers Long Beach homeowners numerous advantages compared to building a new structure from scratch. These practical conversions maximize your property's potential while providing flexibility for your changing needs. Modern ADU Builder & Garage Conversions specializes in helping homeowners realize these benefits through expertly designed and constructed garage ADUs.



  • Cost-Effective Solution - Save 30-40% compared to new construction costs by utilizing your existing garage structure, foundation, and partial framing

  • Rental Income Potential - Generate $1,800-2,500 monthly revenue in Long Beach's competitive rental market

  • Faster Completion Timeline - Enjoy a streamlined process with 2-3 months shorter construction time than ground-up ADUs

Types of Garage Conversion ADUs

Garage conversion ADUs come in various styles and configurations, catering to different needs and homeowner preferences. Some common types include:



  • Studio Apartments: These feature an open layout with a combined living and sleeping area, typically including a small kitchen and bathroom.
  • One-Bedroom Units: Offering a separate bedroom, these units provide more privacy and are suitable for couples or small families.
  • Guest Suites: These are often designed for short-term rentals or accommodating visitors, providing a cozy space away from the main house.


Each type can be customized to fit individual needs while adhering to local regulations. It's essential to work with experienced professionals to ensure that the conversion meets all safety and zoning requirements.

Why Work with Us

We provide exceptional service through a skilled local team, top-notch materials, and a dedicated focus on customer satisfaction. These aspects set us apart and ensure a smooth garage conversion process for every client.

Experienced ADU Specialists

Our team is made up of experienced professionals who understand the unique needs of Long Beach residents. We take pride in our local expertise, which allows us to navigate the specific regulations and zoning laws that govern garage conversions in this area.

Quality Craftsmanship

To guarantee durability and aesthetics, we select only the highest quality materials for our projects. This commitment ensures that your garage conversion looks great and stands the test of time. We work with trusted suppliers who adhere to rigorous standards, so you can feel confident in the longevity of your investment.

Client-Centered Approach

We prioritize our clients throughout the entire process. We believe communication is vital, so we keep you informed about project timelines, progress, and any necessary changes. From the initial consultation to the final walkthrough, our focus remains on your needs and preferences. We listen to your ideas and work diligently to incorporate your feedback into the design and execution.

FAQs on Detached ADU Construction

We understand that constructing a detached ADU can raise many questions. Our aim is to provide clear answers to help you navigate the process smoothly.

  • How much does it cost to build a detached ADU in Long Beach?

    Building a detached ADU in Long Beach typically costs between $300-400 per square foot. For a standard 700-800 square foot detached ADU, expect to invest $210,000-320,000. This includes foundation work, framing, roofing, electrical, plumbing, finishes, and standard appliances. Factors affecting cost include design complexity, material quality, site conditions, and utility connection requirements. Premium finishes, custom designs, or challenging lot conditions can push costs higher. 

  • What permits do I need for a detached ADU in Long Beach?

    For a detached ADU in Long Beach, you'll need a building permit, which encompasses several specific permits under one application through the Development Services Department. This includes structural/architectural approval, electrical permit, plumbing permit, and mechanical permit. You may also need a grading permit if significant earth movement is required. The city conducts plan check reviews for zoning compliance, building code requirements, fire safety, and energy efficiency standards. Permit fees typically range from $8,000-15,000 depending on project scope.

  • How long does it take to build a detached ADU from start to finish?

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  • What's the minimum lot size required for a detached ADU in Long Beach?

    Long Beach no longer enforces a minimum lot size requirement for building a detached ADU. Under updated California ADU laws adopted by Long Beach, you can build a detached ADU regardless of lot size as long as you can meet other requirements. These include maintaining minimum setbacks (4 feet from side and rear property lines), staying within maximum size limitations (1,200 square feet or 50% of primary dwelling size, whichever is less), and ensuring adequate space remains for any required parking.

  • Can I build a two-story detached ADU on my property?

    Yes, you can build a two-story detached ADU in Long Beach. The maximum allowed height is 16 feet, but this can be increased to 25 feet if the detached ADU is within a half-mile walking distance of public transit or when the ADU is built over an existing garage. Two-story designs must comply with all setback requirements and privacy considerations, particularly for second-floor windows overlooking neighboring properties. Building a two-story ADU can maximize your living space while maintaining yard area.