Cost of Building an ADU in Los Angeles (2025 Guide)

An ADU (Accessory Dwelling Unit) is an independent residential unit built on the same lot as your main home. It can serve as a rental property, family housing, or even a home office. In Los Angeles, building an ADU is one of the smartest investments homeowners can make in 2025.

Key Factors That Affect ADU Costs

1. Size & Design
   Smaller ADUs (400–600 sq ft) are more affordable, while larger or luxury ADUs significantly increase costs.
2. Type of ADU
   
   • Garage Conversion ADU: Most cost-effective option.
   • Attached ADU: Built as an extension of the main house.
   • Detached ADU: Standalone in the backyard; highest cost but adds the most value.
3. Permits & City Fees
   In Los Angeles, permits and fees typically range from $5,000–$15,000.
4. Construction & Materials
   In 2025, average costs run about $250–$400 per square foot, depending on finishes and labor.
5. Additional Costs
   Utility connections (water, sewer, gas, electricity), site preparation, and architectural/engineering fees.

ADU Cost Estimates in Los Angeles (2025)

• Garage Conversion ADU (400–500 sq ft): $100,000 – $150,000
• Attached ADU (600–800 sq ft): $150,000 – $220,000
• Detached ADU (800–1200 sq ft): $200,000 – $350,000

Why Building an ADU is Worth It

• Boosts property value by 20–30%.
• Generates rental income ($2,000–$3,000/month in Los Angeles).
• Provides independent space for family or work.

Conclusion

Building an ADU in Los Angeles in 2025 is a smart long-term investment. Depending on the type and size, costs range from $100,000 to $350,000. With strong ROI through property value growth and rental income, ADUs remain one of the best ways to maximize your property.

ZPR Renovation specializes in ADU construction in Los Angeles—from design and permits to complete build. Contact us today to explore your options.