Transform Your Home with an Accessory Dwelling Unit in Campbell
Accessory Dwelling Units, or ADUs, are becoming increasingly popular among homeowners in Campbell, California. If you're a homeowner looking to maximize your property's potential, an ADU might be the perfect solution. This blog post will guide you through everything you need to know about building an ADU in Campbell—from understanding what an ADU is, to exploring its benefits, to navigating the regulations and construction process.
Understanding Accessory Dwelling Units (ADUs)
What is an ADU?
An Accessory Dwelling Unit (ADU) is a secondary housing unit located on the same lot as a primary home. They come in three main types:
- Detached ADUs are free-standing structures separate from the main home.
- Attached ADUs are additions built onto the existing home.
- Interior ADUs are created within the home, such as converting a garage or basement.
Why Are ADUs Becoming Popular?
The rising popularity of ADUs stems from the increasing need for flexible living spaces. They offer a practical and versatile solution for various housing needs, from providing additional rental income to accommodating multi-generational families.
Benefits of Building an ADU
Increased Property Value
Adding an ADU can significantly boost your property's value. Homes with ADUs often sell for more than those without, making it a wise investment for homeowners looking to increase their real estate's worth.
Additional Rental Income
ADUs can be rented out to generate a steady stream of income. Whether it's a long-term tenant or a short-term rental, the extra income can help offset mortgage payments or fund other home improvements.
Multi-Generational Living
ADUs are perfect for families looking to create a multi-generational living arrangement. They offer a private space for elderly parents, adult children, or extended family members while maintaining proximity.
Regulations for Building an ADU in Campbell
Zoning Districts
ADUs are permitted in all residential zoning districts in Campbell, including Planned Development (P-D) zones designated as residential or mixed-use.
Number of ADUs Allowed
Homeowners can create one standard ADU (either interior, attached, or detached) and one statewide exemption ADU (either interior or detached) per single-family dwelling.
Maximum Unit Size and Height
- Detached ADUs can be up to 1,200 square feet, excluding an attached garage, and must not exceed the height of the primary home, with a minimum allowable height of 18 feet.
- Attached and Interior ADUs must comply with the primary home's height restrictions and can be up to 50% of the primary home's living area.
Privacy and Design Requirements
- Balconies, second-story decks, and rooftop terraces are prohibited.
- The design of detached ADUs must match the primary dwelling unit, especially if converting a garage.
Parking Regulations
No additional parking spaces are required for ADUs, and any existing spaces lost to ADU creation do not need to be replaced.
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Steps to Building an ADU in Campbell

Step 1: Planning and Design
Start by assessing your property's potential for an ADU. Consider the type of ADU you want and how it will fit into your existing layout. Engage with an architect or designer to create a blueprint that meets local regulations and your needs.
Step 2: Securing Permits and Approvals
Submit your ADU plans to the Campbell Building Division for approval. This includes zoning clearance, building permits, and any necessary variances. The review process typically takes around 60 days.
Step 3: Construction
Once you have the necessary permits, hire a reputable contractor to begin construction. Ensure that all work complies with local building codes and regulations.
Step 4: Completion and Inspection
After construction, the ADU will need to pass a final inspection to ensure it meets all safety and regulatory standards. Once approved, you can begin using your new ADU.
Real-Life Case Studies of Successful ADU Projects in Campbell
Case Study 1: Detached ADU for Rental Income
Jane and John built a 1,000-square-foot detached ADU in their backyard. They now rent it out to a young professional, generating an extra $2,000 per month in rental income, which helps cover their mortgage payments.
Case Study 2: Attached ADU for Elderly Parents
Maria added a 600-square-foot attached ADU to her home for her aging parents. This allows her to provide care while giving her parents their own private space.
Case Study 3: Interior ADU Garage Conversion
Mike converted his underused garage into a cozy 400-square-foot interior ADU. It's now a perfect space for his college-aged son to live independently while staying close to home.
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Cost Breakdown and Financing Options
Initial Costs
Building an ADU involves various costs, including design, permits, and construction. These costs can range from $2,500 for a simple garage conversion to $14,000 for a new 1,200-square-foot detached ADU.
Financing Options
Homeowners can explore various financing options, such as home equity loans, personal loans, or specialized ADU financing programs. State and local incentives may also be available to help offset some of the costs.
Frequently Asked Questions
Do I have to live on the property?
Yes, if the property has a Junior Accessory Dwelling Unit (JADU), the owner must reside in either the JADU or the primary dwelling unit.
Can I rent the ADU separately from the main home?
Yes, ADUs can be rented out independently.
Can I sell the ADU separately from my home?
No, ADUs cannot be sold separately from the primary residence.
Can the ADU have separate utility meters?
Yes, ADUs can have separate utility meters.
Can I Airbnb my ADU?
No, short-term rentals like Airbnb and VRBO are not allowed in Campbell.
Conclusion
Building an ADU in Campbell offers numerous benefits, from increasing property value to generating rental income and providing flexible living arrangements. By understanding the regulations and following the proper steps, you can create a valuable addition to your home. If you're ready to start your ADU project, consult with local experts and begin planning today!
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