Prefab ADU Setup

Transform your property with the speed and precision of prefabricated accessory dwelling units. At Modern ADU Builder & Garage Conversions, we bring factory-built efficiency to Long Beach properties, delivering exceptional secondary living spaces in a fraction of the time required for traditional construction.


Our turnkey prefab ADU setup solutions combine design excellence with manufacturing consistency, creating beautiful, durable living spaces that arrive ready for efficient installation. Whether you're creating rental income opportunities, accommodating family members, or adding versatile living space, our prefab approach delivers superior results with minimal disruption to your property.


The complete prefab ADU journey with our team typically spans just 3-6 months—from initial design selection through permitting, site preparation, and final installation. Our expert installers handle every aspect: foundation work, delivery coordination, utility connections, and finishing touches that seamlessly integrate your new prefab unit with your existing property.


We offer diverse prefab solutions ranging from fully modular units to panelized systems and container-based designs. Each unit meets or exceeds California's stringent building codes while delivering energy efficiency and architectural appeal that complements your neighborhood.


Experience the perfect balance of quality, speed, and value with Modern ADU Builder & Garage Conversions. Our prefab ADU expertise ensures your investment delivers maximum return with minimum hassle.

Our ADU Development Process

We provide a comprehensive construction process for your ADU, ensuring each stage runs smoothly. Our approach includes initial consultation, compliance with local regulations, prefab manufacturing, and efficient on-site installation.

  • 1. Design Consultation

    In this phase, we engage with you to discuss your vision for the ADU. We gather your requirements, preferences, and budget considerations. Our team uses tools like 3D modeling to visualize the project, ensuring your ideas are accurately represented.


    We focus on customization, allowing options for layout, materials, and finishes. Our goal is to align the design with your lifestyle while complying with local regulations.

  • 2. Permitting and Compliance

    Next, we navigate the permitting process to ensure compliance with Long Beach regulations. This step is crucial to avoid delays and costly adjustments later. We prepare the necessary documentation, including site plans and engineering assessments.


    Our team engages with local authorities to secure permits efficiently. We ensure all aspects, such as zoning laws and safety codes, are addressed. 

  • 3. Prefab Manufacturing

    Prefab construction begins once permits are secured. We collaborate with reliable manufacturers to create your ADU components off-site. This approach reduces construction time and minimizes on-site disturbances.


    Once manufacturing is complete, we schedule delivery to align with the installation timeline. Each piece is carefully inspected for quality before shipment.

  • 4. On-Site Installation

    Installation marks the final step in our construction process. Our skilled team assembles the prefab components according to the approved design. We prioritize precision during this phase to guarantee structural integrity and aesthetic appeal.


    Once the ADU is assembled, we focus on finishing touches. This includes plumbing, electrical work, and interior finishes tailored to your preferences.

Our Prefab ADU Setup Services

We provide comprehensive prefab ADU setup services that cater to the diverse needs of homeowners in Long Beach. Our offerings are designed to ensure a seamless experience from concept to completion, focusing on quality and efficiency.

Prefab ADU Solutions

Prefab ADUs present a modern solution for expanding living space efficiently and affordably. We specialize in prefabricated units that are designed to meet stringent quality standards while optimizing construction timelines.



These units are crafted in a controlled environment before being transported to your property. This process minimizes construction waste and reduces the time spent on-site.

Types of Prefab ADUs Offered

We offer a variety of prefab ADU designs to suit different preferences and requirements. Our options include:



  • Studio Units: Compact and efficient, ideal for single occupancy.
  • One-Bedroom Units: Perfect for small families or guests.
  • Two-Bedroom Units: More spacious, accommodating families or roommates.


Each design includes customizable features such as flooring, kitchen layouts, and bathroom configurations. We collaborate with clients to ensure the selected model aligns with their vision and needs.

Site Assessment

Before installation, we conduct a thorough site assessment to determine the suitability of the property for a prefab ADU. This includes evaluating access points, utility connections, and overall landscape.



Our experts ensure that the site is prepared effectively to accommodate the new unit. This may involve grading the land, clearing obstacles, and ensuring proper drainage systems are in place.

Why Partner with Us

We prioritize quality, transparency, and customer satisfaction in every project we undertake. Our focus is on delivering superior prefab ADU setups that meet our client's needs and expectations.

Quality Materials

We use only high-quality materials that enhance durability and aesthetics. Our partnerships with trusted suppliers ensure that every component of your ADU meets industry standards. Our skilled craftsmen bring years of experience to the table. They pay attention to detail, ensuring every aspect of the installation is executed flawlessly.

Transparent Pricing

We believe in honesty when it comes to pricing and timelines. From the beginning, we provide a clear, itemized estimate, so there are no hidden costs. Our clients know exactly what to expect with each aspect of the project. Timelines are also clearly defined. We set realistic schedules and keep our clients informed throughout the process.

Dedicated Customer Support

Customer support is at the heart of what we do. We maintain open lines of communication at all stages of the project. Our team is always available to answer questions and address concerns. After project completion, we don’t just walk away. We offer ongoing support to ensure your satisfaction.

FAQs on Prefab ADU Setup

We address common inquiries regarding our Prefab ADU installation process. Understanding the specific steps we follow can help clarify how our services work and what to expect.

  • What is a prefab ADU and how does it differ from traditional construction?

    A prefab ADU (accessory dwelling unit) is a housing unit primarily constructed off-site in a factory setting and then delivered to your property for installation. Unlike traditional construction where building occurs entirely on-site from foundation to finish, prefab ADUs are built in controlled factory environments to at least 90% completion before delivery. 

  • How much does a prefab ADU cost to install in Long Beach, CA?

    Prefab ADU costs in Long Beach typically range from $85,000 to $250,000 fully installed. This includes the unit cost ($65,000-$200,000 depending on size and finishes), site preparation ($8,000-$15,000), foundation work ($10,000-$20,000), utility connections ($5,000-$10,000), permits and fees ($3,000-$8,000), and delivery/crane costs ($2,000-$5,000).

  • How long does it take to set up a prefab ADU in Long Beach?

    The complete timeline for prefab ADU setup in Long Beach typically takes 3-6 months from start to finish. This includes: permitting phase (4-8 weeks), prefab unit construction in factory (6-12 weeks running concurrently with site preparation), site preparation and foundation work (2-4 weeks), delivery and installation (1-2 days), and final connections/inspections (2-3 weeks). This is significantly faster than traditional construction methods, which often take 9-12 months for equivalent projects.

  • What types of prefab ADUs are available for Long Beach properties?

    Several types of prefab ADUs are available for Long Beach properties: fully modular units (delivered in complete sections and connected on-site), panelized systems (wall panels and components assembled on-site), container-based ADUs (repurposed shipping containers), tiny homes on foundations, and kit-based ADUs (pre-cut materials with assembly instructions). Styles range from contemporary to traditional California designs, with sizes typically between 400-1,200 square feet.

  • What permits are required for installing a prefab ADU in Long Beach?

    Installing a prefab ADU in Long Beach requires the same permits as traditional construction: building permits, electrical permits, plumbing permits, and potentially grading permits depending on your site conditions. You'll need to submit architectural plans, engineering documents (often provided by the prefab manufacturer), plot plans showing the ADU location, and utility connection details.