ADU Knowledge
June 8, 2024

Does ADU increase property tax in California?

Argi Avetisyan
Argi Avetisyan
Gather ADU expert
Does ADU increase property tax in California?
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Have you been hearing a lot about ADUs lately? Accessory Dwelling Units (ADUs) are becoming increasingly popular in California, offering a flexible solution for homeowners who need extra space. Whether you’re considering an ADU for additional rental income, a home office, or a space for family members, it’s essential to understand how it might affect your property taxes.

What is an ADU?

An Accessory Dwelling Unit (ADU) is a secondary housing unit on a single-family residential lot. These units can be attached to the primary residence, such as a basement apartment, or detached, like a small cottage in the backyard. With housing shortages in many urban areas, ADUs have become a practical and efficient way to maximize property use.

The Relationship Between ADUs and Property Taxes in California

When adding an ADU to your property, it’s crucial to consider its impact on your property taxes. In California, the addition of an ADU will generally lead to an increase in property taxes. However, it's essential to note that this increase is specific to the new construction and does not trigger a reassessment of the entire property.

Determining Property Tax for ADUs

California uses a 'blended assessment' approach when calculating property taxes for ADUs. This means the value of the ADU is added to the existing value of your property. The primary residence is not reassessed, so its original tax value remains unchanged. Instead, the ADU's construction cost is assessed, which then determines the additional property tax.

How an ADU Affects Property Taxes in California

Typically, property tax rates on ADUs in California range from 1% to 1.5% of the construction cost. For example, if your ADU costs $300,000 to build, you can expect an additional $3,000 to $4,500 in property taxes annually. It’s advisable to consult a tax professional for a more precise estimate tailored to your specific situation.

Adding ADU Value to Property Taxes

Once the construction of an ADU is completed, the local assessor’s office will add its value to your property’s assessment. This adjustment is reflected in the next regular property tax bill, which might take up to a year to become active. California law mandates that all new constructions be appraised as of January 1st for property tax assessment purposes. Property owners will receive a letter with the new assessment value, which can be appealed if deemed inaccurate.

Exemptions or Reductions in Property Tax Related to ADUs

While adding an ADU will generally increase property taxes, there are exemptions and reductions that homeowners might qualify for. Some cities in California offer specific tax incentives for constructing ADUs, such as reduced development fees or property tax breaks. Additionally, certain environmentally sustainable or affordable housing ADUs might be eligible for further tax benefits.

Tips for Homeowners on Managing Property Tax Implications When Considering an ADU

ADU Tax
  1. Consult a Tax Professional:

  Seek advice from a tax professional to understand the specific impact on your property taxes and identify any exemptions or deductions you might qualify for.

  1. Review Local Regulations:

  Check with your local government for any tax incentives or fee reductions available for ADU construction in your area.

  1. Plan for Rental Income:

  If you plan to rent out your ADU, factor this income into your budget to help cover the increased property taxes.

  1. Maintain Documentation:

  Keep detailed records of your ADU construction costs and any related expenses for accurate tax reporting and potential deductions.

Conclusion

Adding an ADU to your property in California can provide numerous benefits, from rental income to increased property value. While it will lead to a property tax increase, understanding the specifics of how these taxes are calculated and potential exemptions can help you make an informed decision.

If you’re considering building an ADU and want personalized advice on managing property tax implications, don’t hesitate to book a call with one of our experts. We’re here to help you make the most of your property investment.

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