Published October 9, 2025

Happy House Hacking Podcast EP 9: Why You Need to Build an ADU in California

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Written by Owen & Camille Schwaegerle

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Why You Need to Build an ADUin California

Building an ADU in California: The Best Investment Decision

One investment opportunity in California's real estate market stands out as both innovative and lucrative: Accessory Dwelling Units (ADUs). Building an ADU in California comes as a solution as housing demands continue to surge and urban spaces become increasingly dense.

Besides addressing the need for additional housing, it also offers homeowners a unique avenue for financial growth and flexibility.

But what exactly is an ADU, and why should homeowners in California consider it the best investment decision? 

On this episode of the Happy House Hacking Podcast, Owen and Camille Schwaegerle delve into the intricacies of owning an ADU in California, exploring everything from the fundamental concept of ADUs to the practical steps involved in acquiring and renting out these units.

What is an ADU?

An ADU is a secondary housing unit that can take various forms, ranging from converted garages and basement apartments to standalone structures erected in the backyard. 

These units are designed to provide independent living quarters while still being situated on the same lot as the primary dwelling.

ADUs in California are subject to specific regulations and guidelines outlined by state and local authorities. 

These regulations dictate factors such as size limitations, parking requirements, and zoning restrictions, all of which play a crucial role in the planning and construction process.

The concept of ADUs in California has evolved, with recent legislative changes aimed at easing restrictions and promoting their development as an option to solve the state's housing shortage.

California Senate Bill 1069 and Assembly Bill 2299, significantly streamlined the California ADU Law and approval process for ADUs by removing many barriers that previously hindered their construction.

One of the defining features of ADUs in California is their versatility. The units can serve many purposes such as providing housing for family members, generating rental income, accommodating guests, or even serving as a home office or studio space. 

The adaptability of ADUs renders them appealing to homeowners aiming to optimize their property's functionality while broadening their investment portfolio.

Overall, ADUs in California represent a dynamic and evolving aspect of the state's real estate landscape.

How to Get an ADU: Pre-Approved Plans and Building

Acquiring an ADU in California involves navigating through a series of steps, from planning to construction. 

With recent legislative changes aimed at streamlining the process, obtaining an ADU has become more accessible. 

Explore this comprehensive guideline for acquiring an ADU, incorporating insights on leveraging pre-approved plans and navigating the construction.

Research and Planning

Begin by researching local zoning laws and regulations about ADUs in your area. Familiarize yourself with any restrictions or requirements that may apply.

Assess your property to determine the most suitable location for the ADU and consider factors such as available space, access to utilities, and aesthetic considerations.

Explore different ADU designs and layouts to find one that aligns with your preferences and budget.

Pre-Approved Plans

Consider utilizing pre-approved ADU plans, which have been pre-vetted and approved by local authorities. These plans can significantly expedite the approval process and reduce the need for extensive design review.

Many cities and counties in California offer pre-approved ADU plans as part of their efforts to encourage ADU development. 

These plans typically adhere to local building codes and zoning requirements, providing homeowners with a convenient and cost-effective option for ADU construction.

Permitting and Approval

Once you've selected a design and obtained pre-approved plans, submit your ADU proposal to the appropriate local planning department for review.

Compile and submit all essential paperwork, comprising site plans, floor plans, and construction drawings, alongside your permit application.

Work closely with local authorities to address any concerns or requests for modifications to ensure compliance with building codes and zoning regulations.

With the streamlined process facilitated by pre-approved plans, the permitting and approval stage can proceed more efficiently, reducing delays and uncertainties.

Building the ADU

Once you've obtained the necessary permits and approvals, it's time to begin construction on your ADU.

Hire qualified contractors or builders with experience in ADU construction to ensure the project will comply with the highest standards. 

Hiring an architect is the best option if you don’t have the time to be hands-on with this project. Otherwise hiring a draftsman will be more suitable for your project.

Monitor the construction process closely to ensure adherence to the approved plans and specifications.

Regularly communicate with your contractors and address any issues or changes that may arise during the construction phase.

Why You Should Consider Investing in an ADU in California: The Benefits

Investing in an ADU in California presents compelling reasons, especially given the state's evolving real estate landscape and the implementation of California ADU law. 


Here are some top benefits to consider.

Passive Income Generation

One of the most enticing aspects of investing in an ADU in California is the potential for passive income. 

By renting out the ADU to tenants, homeowners can enjoy a steady stream of rental income, helping offset mortgage payments or providing an additional source of revenue. 

With California's high demand for housing, especially in urban areas, finding tenants for an ADU is often relatively straightforward, making it an attractive investment opportunity.

Equity Creation

Owning an ADU can contribute significantly to building equity in your property. 

As property values continue to rise in California, particularly in sought-after areas, adding an ADU can further boost the overall value of your property. 

This increased equity provides homeowners with greater financial security and leverage for future investments or financial endeavors.

Extremely Low Cost

Building an ADU in California can be surprisingly cost-effective, especially when compared to traditional real estate investments. 

With the implementation of California ADU laws, including streamlined permitting processes and reduced regulatory barriers, the cost and complexity of building an ADU have been significantly reduced. 

Additionally, utilizing pre-approved plans and exploring financing options tailored for ADU construction can lower the costs, making ADU ownership accessible to a wider range of homeowners.

Investing in an ADU in California offers a unique opportunity to leverage the state's favorable regulatory environment and booming real estate market.

By seizing the opportunities for passive income, equity growth, and cost-effectiveness, homeowners can acquire a valuable asset that enriches their property and yields enduring financial advantages.

Whether you're looking to diversify your investment portfolio or maximize the utility of your property, building an ADU in California is a decision worth considering.

Embarking on the journey of building an ADU in California represents a strategic investment decision with multifaceted benefits. 

In a state where housing demands continue to escalate while real estate opportunities abound, ADUs stand out as innovation and practicality. 

With the implementation of California ADU laws streamlining the process and reducing barriers, homeowners are presented with a golden opportunity to maximize the utility of their properties and secure a sustainable source of income.

Whether you're seeking to supplement your income, enhance your property value, or contribute to addressing the housing shortage, building an ADU offers a path toward achieving these objectives and more.

Keep Listening to the Happy House Hacking Podcast

House hacking isn't just about owning a home. It's about building a life of financial freedom and independence.

Make sure to subscribe to the Happy House Hacking Podcast for more tips, tricks, and insider secrets in the world of real estate. 

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