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MY Home Builders, Inc.

© 2026 MY Home Builders, Inc. All rights reserved. Licensed General Contractor, Los Angeles, CA.

Estimates are ballpark figures for planning purposes, subject to on-site physical inspection.

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Please note: This ballpark estimate is for preliminary planning only and does not represent an official quote. The final price can only be calculated upon an on-site visit (Free of charge or commitment).
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MY Home Builders, Inc. • 20720 Ventura Blvd, Unit #280, Woodland Hills, CA 91364

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Phone: (818) 914-4900 • Website: www.myhbinc.com

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Estimates are preliminary ballpark figures for planning purposes only and do not constitute an official quote or binding contract. The final accurate price can only be calculated upon an on-site visit (Free of charge or commitment).

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Calculate Your Remodel Ballpark Estimate

Select your project type below to begin our quick 2-minute design & installation questionnaire. Instant ballpark range with zero obligation.

1. CHOOSE YOUR SERVICE
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How Does an ADU Affect Property Taxes?

July 25, 2024
•
4 min read
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Building an ADU can cause your property taxes to increase—but only for the assessed value of your ADU, and does not trigger a re-assessment of the main home. If you’re earning additional rental income, building an ADU can cause your income taxes to increase.

For example, property tax rates on ADUs in California generally range from 1-1.5% of the construction cost. For example, if the construction cost of an ADU is $300K, you might expect to pay around $3,000 as additional property taxes per year.

Understanding Property Taxes

How Property Taxes Are Calculated

Property taxes are calculated based on the assessed value of your property. This value is determined by the local tax assessor and reflects the market value of the property, including any improvements or additions. The assessed value is then multiplied by the local tax rate to determine the amount of property tax owed.

Factors Affecting Property Tax Assessments

Several factors can influence the assessed value of your property, including:

  • The market value of similar properties in the area
  • Property size and features
  • Improvements and additions, such as an ADU

Impact of an ADU on Property Taxes

Increase in Assessed Value

Adding an ADU to your property typically increases its assessed value. This increase is due to the added living space and potential rental income, which can enhance the overall value of the property. The extent of the increase depends on the size and quality of the ADU, as well as local real estate market conditions.

Calculation Example

For example, if your property is currently assessed at $500,000 and you add an ADU valued at $100,000, your new assessed value could be $600,000. Assuming a local tax rate of 1.25%, your annual property tax would increase from $6,250 to $7,500.

In California, property tax rates on ADUs typically range from 1-1.5% of the construction cost. If the construction cost of an ADU is $300,000, you might expect to pay around $3,000 to $4,500 in additional property taxes per year.

Variations by Location

State and Local Differences

Property tax laws and assessment practices vary by state and locality. Some areas may offer exemptions or reduced assessments for ADUs, while others may fully assess the added value. It’s essential to consult with your local tax assessor’s office to understand the specific rules and regulations that apply to your property.

Special Programs and Exemptions

Certain jurisdictions offer special programs or exemptions that can mitigate the impact of increased property taxes due to an ADU. These programs may include:

  • Homestead exemptions
  • Senior citizen tax relief
  • Income-based assessments

Researching and applying for these programs can help manage the financial impact of your property tax increase.

Financial Planning and Considerations

Budgeting for Increased Taxes

When planning to add an ADU, it’s crucial to budget for the potential increase in property taxes. Factor this into your overall project cost and ensure you have the financial resources to cover the additional tax burden.

Consulting with a Tax Professional

Consulting with a tax professional can provide valuable insights into how an ADU will affect your property taxes. They can help you understand local tax laws, identify potential exemptions, and plan for the financial implications of your project.

Adding an ADU to your property can provide numerous benefits, but it’s important to understand how it will affect your property taxes. By considering the increase in assessed value, researching local regulations, and consulting with professionals, you can make informed decisions and effectively manage the financial impact.

How Much Does it Cost to Build an ADU?

If you’re considering building an ADU, understanding the costs involved is crucial. From construction materials to permits, many factors influence the total cost of building an ADU. For a detailed breakdown of the costs, read our comprehensive guide on How Much to Build an ADU?

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