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Maximize Your Living Space with an Attached ADU

Attached ADU Construction in Campbell, CA | ADU Solutions

At ADU Solutions of Campbell, we specialize in designing and building high-quality attached accessory dwelling units (ADUs) that blend seamlessly with your existing home. Our expert team focuses on creating functional, stylish, and code-compliant ADUs that enhance your property’s value.

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Understanding Attached Accessory Dwelling Units in Campbell

What is an Attached ADU?

 

An attached ADU is a self-contained residential unit that shares at least one wall with the primary residence. Perfect for Campbell, CA homeowners with limited lot space, these units provide the benefits of a separate living area while maintaining close proximity to the main house.

Attached ADUs offer the ideal balance of privacy and convenience, making them great for multi-generational living, hosting guests, or creating a rental unit for additional income. In Santa Clara County, attached ADUs must adhere to specific design and zoning regulations, but they offer versatile solutions that can:


  • Generate rental income
  • Increase property value
  • Accommodate family members or guests
  • Serve as a home office or studio


Whether you're looking to expand your living space or invest in your property, an attached ADU is a smart, flexible solution for Campbell homeowners.

Benefits of Building an Attached ADU in Campbell, CA

Cost-Effective Construction

Increased Property Value & Income Potential

Increased Property Value & Income Potential

Attached ADUs are more affordable to build than detached units, as they share existing walls, utilities, and roofing with the main home. This reduces construction costs while still adding valuable living space. 

Increased Property Value & Income Potential

Increased Property Value & Income Potential

Increased Property Value & Income Potential

Adding an attached ADU can significantly boost your home's market value and offers the potential for rental income, making it a smart investment for Campbell homeowners. 

Efficient Use of Space

Increased Property Value & Income Potential

Convenient Multi-Generational Living

For properties with limited lot size, attached ADUs make the most of your existing space without sacrificing outdoor areas, offering a functional and versatile addition to your home. 

Convenient Multi-Generational Living

Increased Property Value & Income Potential

Convenient Multi-Generational Living

Perfect for housing aging parents, adult children, or extended family, attached ADUs offer independent living with the convenience of being close to the main household—ideal for multi-generational living. 

Attached ADU Design and Permitting in Campbell

Custom Attached ADU Design & Layout Options

Local Regulations & Permitting for Attached ADUs in Campbell

Local Regulations & Permitting for Attached ADUs in Campbell

At ADU Solutions of Campbell, we specialize in creating custom attached ADU designs that seamlessly integrate with your existing home while maximizing functionality and style. Our experienced team works closely with you to develop layouts that fit your space, needs, and budget. Popular attached ADU design options include:


  • Side or Rear Additions: Building an ADU on the side or back of your home offers easy access while maintaining privacy for both the main house and the new unit.
  • Garage Conversions: Transform an attached garage into a fully functional living space—ideal for a studio apartment or one-bedroom ADU—without expanding your home’s footprint.
  • Above Garage Additions: Maximize vertical space by constructing an ADU above your existing garage, creating additional living quarters while preserving your yard space.


Our expert architects and builders ensure your attached ADU not only complements the aesthetic of your primary residence but also complies with all Campbell and Santa Clara County ADU regulations.

Local Regulations & Permitting for Attached ADUs in Campbell

Local Regulations & Permitting for Attached ADUs in Campbell

Local Regulations & Permitting for Attached ADUs in Campbell

Navigating Campbell’s local ADU regulations is crucial for a smooth and successful project. Our team handles the entire permitting process to ensure your attached ADU meets all legal requirements. Key guidelines for attached ADUs in Campbell include:


  • Setback Requirements: Attached ADUs generally require a minimum of 4 feet from side and rear property lines, ensuring proper spacing and fire safety.
  • Size Limits: Attached ADUs can be up to 50% of the main home’s size or a maximum of 1,200 sq. ft., depending on lot size and local zoning.
  • Height Restrictions: Attached ADUs must align with the primary residence’s height limits, typically up to 25 feet.
  • Parking Requirements: In many cases, no additional parking is required, especially if your property is within ½ mile of public transit or if you're converting an existing structure like a garage.


Our experienced team will manage the entire permitting process, ensuring your attached ADU is built to code and completed without unnecessary delays, all while adhering to Campbell’s ADU regulations.

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How Long Will It Take to Design, Permit, and Build?

At ADU Solutions of Campbell, your trusted Santa Clara County ADU builder, we are dedicated to guiding you through every step of the ADU construction process, ensuring a seamless and stress-free experience from initial concept to final completion. 

The ADU design phase typically takes 4-6 months, depending on the complexity of the project and the type of Accessory Dwelling Unit you’re building. This stage includes:

  • Creating custom floor plans and architectural designs
  • Ensuring compliance with Campbell and Santa Clara County ADU regulations
  • Preparing the necessary documentation for permit submission

A well-thought-out design ensures a smoother build and maximizes your ADU’s functionality and value.


The ADU permitting process generally takes 3-5 months, depending on the complexity of your project and the Campbell city permit office timelines. During this phase, we handle:

  • Submitting all required documents to the Santa Clara County Planning Department
  • Ensuring your ADU meets local zoning laws and building codes
  • Addressing any feedback or changes from city planners

Our expertise in Campbell ADU regulations helps streamline this process and avoid unnecessary delays.


The ADU construction timeline varies based on the type and size of your project:

  • Garage Conversions: Typically completed in 6-7 months
  • Small Detached ADUs: Usually take 7-8 months
  • Large Detached or Two-Story ADUs: Can take up to 12 months

Weather conditions (like rainy seasons) and project complexity can impact the timeline, but our experienced team ensures your ADU is completed efficiently and to the highest standards.

💡 Pro Tip: We provide regular updates throughout the construction process, so you're always informed on your ADU’s progress!


Why Choose ADU Solutions of Campbell?

Our Seamless ADU Construction Process

Building an Accessory Dwelling Unit (ADU) in Campbell, CA can be complex, but with ADU Solutions of Campbell, we make the process seamless, efficient, and stress-free. With over 10 years of local experience and deep knowledge of Santa Clara County’s ADU regulations, we handle every step from start to finish—ensuring your project is completed on time, on budget, and to the highest standards. Here's how our licensed ADU experts bring your vision to life: 

Step 1: Initial Consultation and Project Goals

Step 2: Property Evaluation and Financing Guidance

We start with a free consultation to understand your goals and vision. Whether you're building an ADU for rental income, a home office, or a guest house for family, we tailor every detail to fit your needs. During this phase, we’ll discuss:


  • Purpose of your ADU (rental unit, in-law suite, guest house, etc.)
  • Desired design features (number of bedrooms, bathrooms, square footage)
  • Architectural styles that complement your primary residence


Establishing clear goals helps us craft a design that perfectly aligns with your vision and budget.

Step 2: Property Evaluation and Financing Guidance

Step 2: Property Evaluation and Financing Guidance

We conduct a thorough site evaluation to determine the best location and type of ADU—whether it's a detached unit, attached addition, or a garage conversion. We also:


  • Assess property zoning laws and setback requirements specific to Campbell, CA
  • Provide guidance on financing options—whether you’re paying out of pocket or seeking an ADU loan
  • Conduct a market analysis to estimate how much property value your ADU will add


With this information, we help you establish a solid plan and budget for your project.

Step 3: Customized ADU Design & Planning Services

Step 3: Customized ADU Design & Planning Services

Our design experts work closely with you to develop a custom ADU tailored to your property and needs. We focus on:


  • Maximizing space while maintaining functionality and aesthetics
  • Incorporating energy-efficient solutions and modern features
  • Selecting materials and finishes that match your existing home


You'll have the opportunity to customize everything—from the floor plan to the roofing, windows, and exterior siding.

Step 4: Transparent ADU Bid & Pricing

Step 3: Customized ADU Design & Planning Services

Once your design is finalized, we provide a detailed bid outlining all costs associated with the project. This includes:


  • Itemized pricing for materials, labor, and permits
  • Clear timelines for each phase of construction
  • A bid that can be submitted to your lender if you’re financing your ADU


Our transparent pricing ensures there are no surprises—just quality results within your budget.

Step 5: Permits & Professional Construction

Navigating Santa Clara County’s complex ADU permitting process can be challenging, but we handle it all for you. We:


  • Secure all necessary permits and approvals
  • Ensure compliance with local building codes and zoning laws
  • Begin construction using our licensed, experienced builders


Our team works efficiently to ensure your ADU is built to exact specifications, on time, and on budget.

Step 6: Your New ADU is Ready!

 Once construction is complete, your brand-new ADU is ready to use! Whether you're renting it out for passive income, housing family, or using it as a home office, your new space adds significant property value and versatility to your home. 

Choose ADU Solutions your Local, Licensed ADU Builder

ADU Solutions of Campbell is an Experienced ADU Builder

 

  • ✔️ Over 10 Years of Experience in Santa Clara County
  • ✔️ In-depth knowledge of Campbell zoning laws and ADU regulations
  • ✔️ Fully licensed and insured general contractors
  • ✔️ Personalized service and end-to-end project management
  • ✔️ Proven track record of delivering high-quality ADUs on time and on budget


📞 Ready to Get Started? Contact us today for a free consultation and let’s turn your ADU vision into a reality! 💡🏡

Contact ADU Solutions Today!

With ADU Solutions of Campbell, you get the expertise and local knowledge needed to make your ADU construction process smooth, stress-free, and successful.

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Frequently Asked Accessory Dwelling Unit Questions

Please note that regulations are subject to change. It's advisable to consult the City of Campbell's official resources or contact local planning authorities for the most current information.


For more information and resources on building an ADU in Campbell, visit the Santa Clara County ADU website.

The cost of building an Accessory Dwelling Unit (ADU) in Campbell, CA can vary based on the type, size, design, and materials you choose. On average, ADU construction costs range from $150,000 to $400,000, depending on whether you're building a detached ADU, an attached addition, or converting an existing space like a garage. You can find more detailed cost information on our ADU Cost Estimation page or to get an even more accurate estimate tailored to your specific project, use the Santa Clara County ADU Cost Calculator. This tool provides a detailed cost breakdown based on your property and ADU preferences

🔗 Click here to use the ADU Cost Calculator

💡 Pro Tip: Don’t forget to factor in additional costs like permits, utility connections, and design fees when budgeting for your ADU project!


If you're considering building an Accessory Dwelling Unit (ADU) in Campbell or anywhere in Santa Clara County, the Santa Clara County ADU Guidebook is an invaluable resource. This comprehensive guide covers everything you need to know, including:

✔️ Zoning regulations and building codes
✔️ Design and construction guidelines
✔️ Permitting processes
✔️ Financing options and incentives
✔️ Helpful tips to navigate the ADU development process

Whether you're planning a detached ADU, attached addition, or a Junior ADU (JADU), this guidebook has you covered!

📥 Download the Print-Friendly Guidebook:
🔗 Santa Clara County ADU Guidebook (PDF)

🌐 View the Online Version:
🔗 Santa Clara County ADU Guidebook Online

💡 Pro Tip: This guidebook is frequently updated to reflect the latest regulations and incentives, so make sure to reference it throughout your ADU planning process!


If you're planning to build an Accessory Dwelling Unit (ADU) in Santa Cruz County, it's essential to familiarize yourself with local building codes, zoning regulations, and permitting processes. Fortunately, there are several resources to guide you through the process:

📋 Santa Cruz County ADU Guidelines:
OCA Builders provides a guide that breaks down everything you need to know about building an ADU in Santa Cruz County, including zoning laws, size limits, and parking requirements.
🔗 View Santa Cruz County ADU Guidelines

🌐 Santa Cruz County Official Resources:
For the most up-to-date regulations and county-specific requirements, visit the official Santa Cruz County Planning Department website. They provide detailed information on:

  • Permitting processes
  • Zoning and setback requirements
  • ADU size and height restrictions

🔗 Santa Cruz County Planning Department

💡 Pro Tip: Every city within Santa Cruz County may have slightly different ADU regulations, so be sure to check with your local jurisdiction or reach out to a professional ADU builder for guidance tailored to your property!


Building an Accessory Dwelling Unit (ADU) in Campbell, CA is a significant investment, but there are several financing options available to help make your project a reality:

✔️ Home Equity Loans or HELOCs: Tap into your existing home equity to fund your ADU project, often with lower interest rates compared to personal loans.

✔️ Cash-Out Refinance: Refinance your current mortgage and use the extra funds to build your ADU. This option can also help lower your overall mortgage rate.

✔️ Renovation or Construction Loans: Special loans designed for home improvement projects can be used to finance ADU construction.

✔️ Government Programs & Incentives: Santa Clara County offers various programs and resources that may provide financial assistance, including grants or low-interest loans for ADU development.

💡 Pro Tip: Use the Santa Clara County ADU Cost Calculator to estimate your project costs and explore which financing option works best for you!


Adding an Accessory Dwelling Unit (ADU) to your property in Campbell offers several long-term financial and lifestyle benefits:

✔️ Increased Property Value: ADUs can significantly boost your home’s value, often providing a high return on investment when you sell.

✔️ Rental Income Potential: Rent out your ADU for passive income, helping to offset your mortgage or other expenses. The demand for affordable housing in Santa Clara County makes ADUs a popular rental option.

✔️ Cost-Effective Housing Solution: Whether for aging parents, adult children, or guests, an ADU offers flexible living space without the need for buying or renting another property.

✔️ Tax Benefits: In some cases, homeowners may qualify for tax deductions related to ADU construction costs or depreciation if used as a rental.

💡 Fun Fact: According to housing studies, homes with ADUs sell for up to 30% more compared to similar properties without one!


An ADU isn’t just an extra structure on your property—it can significantly enhance your lifestyle and provide long-term benefits:

✔️ Multi-Generational Living: An ADU offers independent living space for aging parents, adult children, or extended family while keeping them close.

✔️ Work-From-Home Solution: Create a private home office or studio in your ADU, offering separation from your main living area.

✔️ Flexible Living Space: Use your ADU as a guest house, art studio, gym, or even a short-term rental for extra income.

✔️ Aging in Place: Many homeowners build ADUs with accessibility features, allowing them or their loved ones to age comfortably without leaving their property.

💡 Pro Tip: A well-designed ADU can meet your changing needs over time, offering unmatched flexibility and value for years to come!


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At ADU Solutions of Campbell, we’re dedicated to turning your ADU vision into reality. With over 10 years of experience in Santa Clara County, our team of licensed contractors is committed to delivering high-quality craftsmanship and exceptional customer service. Whether you're planning to build a detached ADU, an attached addition, or convert existing space into an Internal ADU or Junior ADU (JADU), we manage the entire process—from design and permitting to construction and final inspection.


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1999 S Bascom Ave, Campbell, CA 95008, USA

408-705-2325

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ADU Solutions

1999 S Bascom Ave

Campbell, CA 95008

408-705-2325

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