City of Pomona ADU Requirements | California
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City of Pomona ADU Requirements | California

|Jun 17, 2024

Navigating the intricacies of building a prefab ADU  in Pomona, California, requires a comprehensive understanding of the new ADU laws effective in 2024. These regulations not only impact the construction process but also shape the landscape of housing options in Pomona.

From zoning and permits to budgeting and design considerations, each step demands careful attention to ensure a successful Pomona ADU project. In this comprehensive guide, we delve into the critical factors to consider before starting your journey.

Building an ADU in Pomona CA | New ADU Laws in 2024

The new ADU laws in California, effective in 2024, bring significant changes to the landscape of accessory dwelling unit construction, particularly in Pomona. These laws aim to streamline the process and increase housing options for residents. Key provisions include minimum size requirements, with each ADU mandated to be at least 1200 square feet in size.

The height restrictions are set at 25 feet for attached ADUs, aligning with zoning regulations, though exceptions may apply based on specific circumstances. Senate Bill 9 mandates that all construction proposals undergo approval from local authorities to ensure compliance with California ADU size limit, height, and state laws, reducing potential permission-related issues in the future.

The legislation safeguards existing affordable housing by prohibiting the alteration or destruction of occupied housing units during construction. ADUs must be intended for residential use only, with restrictions on short-term rentals. The laws also ensure accessibility by providing financing options for low to moderate-income earners.

Building an ADU in Pomona CA | New ADU Laws in 2024

Factors to Consider Before Building an ADU in Pomona

Zoning and Lot Size

Understanding Pomona's zoning regulations is crucial before you fulfill other Pomona ADU requirements. Zoning laws dictate where ADUs can be built and the lot size requirements they must meet. By familiarizing yourself with these regulations, you can determine if your property is eligible for ADU construction and which areas are suitable for placement.

Building Permits and Approval Process

Navigating the City of Pomona ADU requirements, permit and approval process is a significant aspect.. Securing the necessary permits from the city and complying with regulatory requirements are essential steps in the construction process.

Senate Bill 9, which streamlines the approval process for ADUs, has made it easier for homeowners to obtain permits. However, understanding the specific requirements and documentation needed for permit applications is crucial to avoid delays or complications.

Building Permits and Approval Process

Budget and Financing

Assessing your financial resources and exploring financing options is fundamental when planning an ADU project. Construction costs, including materials, labor, and permits, can vary depending on the size and complexity of the ADU.

Considering long-term financial implications, such as property taxes and insurance, is essential for budgeting purposes. Exploring financing options, such as home equity loans or construction loans, can provide funding for your ADU project.

Design and Layout

Careful consideration of the ADU's design and layout is essential to maximize functionality and livability. Factors such as size, room configuration, and amenities should align with your needs and preferences.

Adhering to building codes and accessibility standards ensures compliance with regulatory requirements. Collaborating with an architect or designer can help translate your vision into a practical and aesthetically pleasing ADU design.

Incorporating sustainable design principles, such as energy-efficient features and passive solar design, can enhance the environmental performance of your ADU while reducing operating costs.

Design and Layout

Rental Market and Demand

Analyzing the local rental market and demand for ADUs is crucial for assessing the potential rental income and return on investment. Factors such as location, neighborhood amenities, and rental rates influence the demand for ADUs in Pomona. Conducting market research, including comparative market analysis and rental rate surveys, helps gauge the market demand and rental potential of your ADU.

Moreover, understanding tenant preferences and market trends allows you to tailor your ADU to meet the needs of potential renters and maximize occupancy rates.

Exploring property management options or rental platforms can help streamline the rental process and maximize returns on your ADU investment.

How Big Can an ADU Be in California?

The size of an ADU can vary depending on local regulations and the type of ADU being constructed. Generally, there are minimum and maximum size requirements for ADUs.

Local building codes and zoning regulations often dictate the minimum size requirement. In many areas, the minimum size for an ADU is around 150-220 square feet for a studio or one-bedroom unit, but this can vary.

As for the maximum size, it also depends on local regulations and the type of ADU. Detached ADUs typically have more flexibility in size compared to attached or conversion ADUs. In some areas, detached ADUs can be as large as 1,200 square feet or more, but this can vary based on local zoning ordinances.

Check with your local planning department or building authority to determine the specific size requirements and regulations for ADUs in your area.

How Big Can an ADU Be in California?

Pomona ADU Permit Cost and Other Costs Breakdown

Understanding the California ADU grants and the costs associated with obtaining permits and construction of an ADU in Pomona is essential for budget planning. Permit costs typically include various fees charged by the city for reviewing and processing your permit application. These fees can vary depending on the size and complexity of your ADU project and may include plan check fees, permit issuance fees, and inspection fees. Additionally, there may be fees for specific permits required for utilities, such as electrical or plumbing permits.

Apart from permit costs, several other expenses should be considered when building an ADU in Pomona. Construction costs are a significant component and can vary depending on factors such as materials, labor, and the size of the ADU. Site preparation costs, including grading, excavation, and utility connections, should also be factored into your budget.

Other miscellaneous costs to consider include permit expediting fees, which may be necessary to expedite the permit approval process, as well as landscaping and interior finishing costs to complete the ADU once construction is finished.

Pomona ADU Permit Cost and Other Costs Breakdown


As Pomona embraces the new ADU laws, homeowners are presented with unparalleled opportunities to enhance their properties and address housing needs. By understanding the regulations, considering essential factors, and carefully planning each step, you can start work on your prefab homes California project right away.

Whether seeking additional income, accommodating loved ones, or simply maximizing property value by building a backyard tiny home, the Pomona ADU construction path is paved with potential.

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