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7 Steps in Building an ADU in Los Angeles

Building an Accessory Dwelling Unit (ADU) in Los Angeles can be a rewarding venture that adds value to your property and provides additional living space. Here’s a comprehensive guide on the steps involved, along with the types of ADUs you can consider.

1. Initial Planning and Research

The first step involves thorough planning and research. Understand the local zoning laws and regulations pertaining to ADUs in Los Angeles. This includes:

  • Zoning Requirements: Check if your property is zoned for an ADU.
  • Size and Design Restrictions: Be aware of the maximum and minimum size requirements for your ADU.
  • Permitting Process: Familiarize yourself with the necessary permits and the process to obtain them.
2. Budgeting and Financing

Determine your budget for the ADU project. Consider costs for:

  • Design and Planning
  • Construction
  • Permits and Fees
  • Utilities and Landscaping

Explore financing options such as home equity loans, refinancing, or specific ADU financing programs.

3. Hiring a Licensed ADU Contractor in Los Angeles

Select a licensed ADU contractor in Los Angeles with experience in building ADUs. Ensure they are familiar with local codes and can handle:

  • Design and Architectural Plans
  • Permit Acquisition
  • Construction Management
4. Design and Plan Development

Work with your contractor or an architect to create detailed design and construction plans. Consider:

  • Space Optimization: Efficiently use the available space.
  • Aesthetic Integration: Ensure the ADU complements your existing property.
  • Sustainability: Incorporate energy-efficient features.
5. Permit Acquisition

Submit your plans to the Los Angeles Department of Building and Safety for approval. This step involves:

  • Plan Review: The department reviews your plans for compliance with local regulations.
  • Revisions: Make any necessary changes based on feedback.
  • Approval: Once approved, you’ll receive the necessary permits to begin construction.
6. Construction

With permits in hand, construction can begin. This involves:

  • Site Preparation: Clear and prepare the site for building.
  • Foundation Work: Lay the foundation according to the approved plans.
  • Building Structure: Construct the ADU, including framing, roofing, and installing utilities.
  • Interior Finishing: Complete the interior with plumbing, electrical work, and finishing touches.
7. Final Inspections and Approvals

After construction, the ADU must undergo final inspections to ensure it meets all safety and building codes. Once it passes these inspections, you’ll receive a certificate of occupancy.

Types of ADUs

There are various types of ADUs you can build, each serving different needs and property layouts:

1. Detached ADUs

A separate structure from the main house, offering complete privacy. Ideal for:

  • Guest Houses
  • Rental Units
  • Home Offices
2. Attached ADUs

An extension of the main house, sharing a wall but having a separate entrance. Suitable for:

  • In-law Suites
  • Home Offices
  • Additional Living Space
3. Garage Conversions

Converting an existing garage into an ADU. This is a cost-effective option and works well for:

  • Small Apartments
  • Studio Units
  • Guest Rooms
4. Interior Conversions

Utilizing existing space within the main house, such as basements or attics, for the ADU. Best for:

  • Studio Apartments
  • Additional Bedrooms
  • Home Offices


Building an ADU in Los Angeles can enhance your property’s value and utility. By following these steps and choosing the right type of ADU, you can create a functional and stylish addition to your home.

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