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  • Writer's pictureADU Builders Group

Maximizing Space and Value: Guide to Attached ADU



As more people want homes that can be used in different ways, homeowners are trying new ideas to get the most out of their property. One popular idea is making an Attached Accessory Dwelling Unit (ADU). In this detailed blog post, we'll talk about what an attached ADU is, why people want it, who benefits from it, how it affects property value, the costs involved, and the step-by-step process to make one from start to finish.



What is an Attached ADU?

An Attached Accessory Dwelling Unit, or ADU, is like a mini home inside a bigger home. It's not a separate building, but a part of the main house. Instead of being on its own, it's connected to the main house and uses some of its walls and structures to make a new space for living. So, it's like having an extra living area that's kind of tucked into the existing house.

Purpose of Attached ADU:

An attached ADU is like an extra space in your house that can be used for different things. It can be a place for grandparents to stay, a rental to earn more money, or just more room for a bigger family. So, it's a handy way to make your house work better for you.

Who Will Benefit from Attached ADU?

  • Multigenerational Families: Attached ADUs offer an optimal living solution for multigenerational families. These units allow family members to share the same property, fostering a sense of togetherness while still providing individual privacy. With a separate living space connected to the main home, multigenerational families can enjoy proximity while maintaining personal space.

  • Homeowners Seeking Rental Income: For homeowners looking to diversify their income streams, an attached ADU presents an attractive opportunity. By converting the additional space into a rental unit, homeowners can meet the rising demand for independent living spaces. This not only provides financial benefits but also contributes to the broader trend of creating more affordable housing options within communities.

  • Individuals Working from Home or Engaged in Creative Pursuits: More people are now working from home or doing creative things. This means there's a higher demand for a quiet and private space to focus on work or art. Having an attached ADU is like having a useful tool for people who do professional work or art projects. It provides an extra room where you can concentrate better and get more work done. Whether you need a home office or a space for your artistic activities, the attached ADU is like a helpful and flexible addition, giving you the right environment for your work or creative projects.

Impact on Property Value:

Adding an attached ADU has the potential to significantly increase the overall value of your property. The versatility and functionality of the extra living space appeal to a wide range of potential buyers, making your home more attractive in the real estate market.

Cost Considerations:

The cost of adding an attached ADU can vary depending on factors such as size, location, and the level of customization. On average, homeowners can expect to invest anywhere from $50,000 to $150,000 or more. It's essential to consult with a reputable contractor to get a detailed estimate based on your specific requirements.

Advantages of Attached ADU:

  • Cost-Effective Construction: Since an attached ADU shares one or more walls with the main house, construction costs can be lower compared to building a separate structure.

  • Seamless Integration: It seamlessly blends with the main house, maintaining architectural coherence and often appearing as a natural extension of the existing structure.

  • Utilization of Existing Infrastructure: Utilizing existing walls and infrastructure, it makes use of the space within the main house efficiently.

  • Accessibility: Providing direct access from the main house, it offers convenience for multigenerational families or homeowners who want immediate access to the additional space.

  • Zoning and Permitting: It may have fewer zoning restrictions and permitting requirements compared to detached structures, making the approval process potentially smoother.

Timeline from Start to Finish:

The timeline for creating an attached ADU can range from a few months to a year, depending on the complexity of the project. The general process involves the following steps:

  • Feasibility Assessment: Before diving into the process of adding an attached ADU, it's essential to assess whether it's doable. This involves checking local rules and regulations, making sure your home's structure can handle it, and ensuring everything aligns with zoning and building codes.

  • Design and Planning: Collaborate with an architect or designer to come up with a plan that not only fits seamlessly with your current home but also meets your specific needs. This stage is crucial for creating a customized and functional space.

  • Permitting: Get the green light from local authorities by obtaining the necessary permits. This step ensures that your project aligns with all the building codes and zoning regulations in your area, making the construction process legal and safe.

  • Construction: This is the hands-on part where the attached ADU takes shape. It involves everything from building the framework and putting on the roof to handling electrical work, plumbing, and finishing the interior. It's where the physical construction of your additional living space happens.

  • Inspection: Once construction is finished, thorough inspections are carried out to make sure everything meets the required standards and codes. This step ensures that your attached ADU is safe and complies with all necessary regulations.

  • Occupancy: After passing inspections, your attached ADU is officially ready to be used. Whether you're welcoming family members, renting it out, or using it for personal purposes, this is the stage where the space is officially good to go.


An attached ADU presents an exciting opportunity for homeowners to enhance their living spaces and property values. To make smart choices about adding an attached ADU to your house, you should know why you want it, who will benefit from it, how it might change your home's value, how much it will cost, and the steps to get it done. Knowing all these things helps you make the best decisions to make your property even better.

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