ADU Construction in San Jose, California | Top Choice Builder
Are you considering adding an Accessory Dwelling Unit (ADU) to your property in San Jose or the surrounding areas? At Top Choice Builder, we specialize in designing and building high-quality ADUs tailored to fit your lifestyle, increase your property value, and create additional income or living space. Whether you’re building a detached guest house, converting a garage, or adding a backyard rental unit, our experienced team is here to guide you from concept to completion.
What Is an ADU?
An ADU (Accessory Dwelling Unit), also known as a granny flat, in-law suite, casita, or backyard cottage, is a secondary housing unit on a residential lot. These structures can be attached to the main home, detached, or converted from existing space like a garage or basement. Thanks to California’s recent legislation supporting housing expansion, building an ADU in San Jose has become more accessible than ever.
Top Choice Builder makes the process simple and stress-free with expert planning, permitting, and construction services all under one roof.
Why Build an ADU in San Jose?
- Passive Rental Income: Offset your mortgage by renting out the unit.
- Family Housing: Provide private space for aging parents or adult children.
- Home Office or Studio: Create a dedicated workspace just steps from home.
- Guest Suite: Offer visiting family and friends their own comfortable space.
- Increased Property Value: ADUs boost resale potential and market appeal.
Types of ADUs We Build
We build a variety of ADU types for homeowners throughout San Jose and neighboring cities:Detached ADUs
A stand-alone unit built in your backyard or side yard, perfect for maximum privacy. Detached ADUs often resemble small homes and can range from 400 to 1,200 square feet.
Attached ADUs
Built as an addition to your main house, these units share a wall and are ideal for smaller lots or seamless architectural integration.
Garage Conversions
Turn your unused garage into a functional and stylish living space. Garage conversions are a cost-effective way to create an ADU without expanding your footprint.
Interior Conversions
Convert an existing basement, attic, or underused area inside your home into a code-compliant living space with its own entrance and amenities.
No matter which type of ADU you choose, we ensure the design meets all San Jose zoning codes, setback requirements, and utility connections.
Our Full-Service ADU Process
Building an ADU in San Jose requires experience with local permitting and construction regulations. Top Choice Builder handles every step of the process, including:1. Free Consultation & Site Evaluation
We begin with a no-obligation consultation to understand your goals and evaluate your property for ADU feasibility.
2. Custom Design & Planning
Our in-house design team creates a detailed plan that suits your lifestyle, enhances your property, and maximizes space.
3. Permitting & City Approvals
We work directly with the City of San Jose and nearby municipalities to obtain all required building permits and ensure compliance with SB9, Title 24, and local ordinances.
4. Construction & Project Management
Our skilled crew handles the entire build with expert craftsmanship, efficient timelines, and regular updates to keep you informed at every phase.
5. Final Inspection & Move-In Ready
Once completed, we schedule final inspections and ensure your new ADU is fully functional, safe, and ready for occupancy.
Why Choose Top Choice Builder for Your San Jose ADU?
Local San Jose Expertise
We understand the unique zoning laws, soil conditions, and building requirements specific to the San Jose area. Our team has built ADUs throughout Santa Clara County and knows what it takes to get permits approved quickly.Transparent Pricing
We provide clear, detailed estimates with no hidden costs. Our goal is to deliver the highest value within your budget.Quality Craftsmanship
We take pride in our workmanship and use only high-quality materials and trusted subcontractors. From foundation to finishes, we build to last.Personalized Service
Every project is different, which is why we take the time to tailor our approach to your specific needs, timeline, and property conditions.Trusted & Licensed Contractor
We’re fully licensed, insured, and backed by years of experience in residential construction across the Bay Area.Common Questions About ADUs in San Jose
How much does an ADU cost in San Jose?
Costs can vary widely depending on size, design, and lot conditions. On average, homeowners in San Jose can expect to invest between $150,000 and $350,000 for a fully finished ADU.How long does it take to build an ADU?
The total project timeline—from design through final inspection—typically takes 6 to 12 months, depending on complexity and permit approvals.Can I build more than one ADU?
Yes. Under current California laws, some properties may qualify for both a Junior ADU (JADU) and a standard ADU. We’ll help assess your specific situation during your consultation.Do I need a separate utility hookup?
San Jose allows shared or separate utility connections. We’ll guide you through the most cost-effective and code-compliant option for your project.Start Your San Jose ADU Project Today
Ready to transform your property with a beautiful, functional ADU? Top Choice Builder is your trusted partner for ADU design and construction in San Jose and surrounding communities like Santa Clara, Cupertino, Campbell, and Los Gatos.
Let’s make your ADU vision a reality—whether you’re planning for rental income, family housing, or a modern home office.
Call us today at (408)600-6094 request a free consultation online at Top Choice Builders
