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Building an Accessory Dwelling Unit (ADU) in Los Angeles
ADU construction cost in Los Angeles

On average,  ADU construction cost in Los Angeles can range from $75,000 to $350,000 (the cost per square foot can range from $200 to $500) or more. Here are some typical cost ranges based on size:ADU construction cost in Los Angeles

  • Studio/1-bedroom (300-600 square feet): Typically between $75,000 and $200,000.

  • 2-bedroom (600-1,200 square feet): Costs can range from $120,000 to $350,000 or more, depending on the complexity and finishes.

The ADU construction cost in Los Angeles can vary in cost depending on several factors, including size, location, design, and the level of finishes you choose. As of my last update, here's a breakdown of what you might expect:ADU construction cost in Los Angeles


  • Size: ADUs can range from small studio layouts to larger two-bedroom configurations. The size of the unit significantly influences the overall cost.

  • Type: There are different types of ADUs – detached (standalone units), attached (connected to the main house), and converted (such as garage conversions). Detached ADUs are generally the most expensive due to the need for separate building systems and structures.

  • Design and Materials: Custom designs and higher-end materials will increase costs. Standard, off-the-shelf designs and materials tend to be more economical.

  • Site Preparation and Access: Costs can escalate if the site requires significant preparation or if access is difficult. This includes grading, foundation work, and utility connections.

  • Permits and Fees: Los Angeles has specific requirements and fees for ADU development, which can add to the total cost.

Breakdown of Typical Costs


  • Permits and Fees:

    • Permitting fees can range from $5,000 to $15,000, depending on the complexity of the project and local regulations.

  • Site Preparation:

    • Site work, including grading, utilities connection, and foundation work, can range from $10,000 to $30,000.

  • Construction Costs:

    • The actual building costs, including materials and labor, are typically between $150 and $300 per square foot.

  • Utilities and Hookups:

    • Connecting the ADU to existing utilities (water, sewer, electricity) can add another $10,000 to $20,000.

  • Interior Finishes:

    • Costs for interior finishes can vary widely but typically range from $20,000 to $50,000 or more, depending on the quality and level of customization.


Constructing an ADU in Los Angeles can be a valuable investment, but it’s essential to have a clear understanding of the associated costs. By considering the factors outlined above and planning accordingly, you can ensure that your ADU project meets your needs and budget.

ADU construction cost in Los Angeles

These estimates are approximate and can vary based on the current market conditions, labor rates, and material costs. Consulting with DVB constructoin and we can give you a more accurate and detailed estimate based on your specific requirements.

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