1. Home
  2. Learn About ADUs

How much does it cost to build an ADU?

It isn't easy to give a general estimate of the cost of building an ADU since it varies significantly depending on the size and complexity of the project, the materials used, the location, and the local building codes and regulations. We estimate the average price of ADU construction in California to be between $200,000 to $300,000.

ADU construction cost and financing calculations

TIP: Use our ADU construction cost calculator to estimate your ADU's price in California.

Some factors that influence the expenses related to building an ADU include:

1. Size: The size of the ADU is one of the main factors affecting the construction cost. Larger ADUs will typically cost more to build than smaller ADUs.

2. Materials: The cost of building materials, such as lumber, concrete, and roofing, can vary depending on the quality and type of materials used. Using higher-quality materials or specialty materials can increase the cost of the project.

3. Finishes: The finishes and fixtures in the ADU, such as flooring, cabinetry, and appliances, can also affect the project's cost. Higher-end finishes and fixtures will typically cost more than basic or standard options.

4. Professional fees: Hiring a designer or architect to help with the design and planning of the ADU can add to the project's overall cost. The cost of hiring a contractor to oversee the construction of the ADU will also be a factor.

5. Permits and fees: You may need to pay for various permits and expenses to build an ADU, including building, plumbing, and electrical permits. These fees can vary depending on the location and the project's requirements.

Contact us to discuss your project and get an accurate estimate of the construction costs. We can help you get multiple estimates from experienced local contractors specializing in building ADUs in California.

Related Articles

Want to build an ADU in California?

We can help you design, plan and get permits for your ADU today!