ADU Architect in San Jose - Design, Permits & Construction

Accessory Dwelling Units can be a great way to add extra living space and boost the value of your property. From building a secondary home to boost your family’s income to converting your garage for an extra bedroom to a cool new weekend retreat, the first step in any of these projects is to think about the architecture.

We make homeowners feel confident with each step of the process at Dwelling Lab. We design functional, aesthetically pleasing spaces that meet your property and objectives, from feasibility studies through design and permitting to construction support. We routinely work with seasoned ADU contractors in San Jose to make sure that every design is ready for an easy change into development.

At Dwelling Lab, this is our core focus. As licensed California architects, we specialize in ADU design and permitting and have helped homeowners and property owners move confidently through every phase of the process—from early feasibility and design through approvals and construction coordination. Our approach keeps projects moving forward with clarity, efficiency, and a long-term mindset so your ADU works as a functional asset, not a headache.

Our ADU Design & Permitting Process

Successful ADUs always begin with a plan. We streamline each step of the process, while designing architecture that provides functionality, beauty, and lasting value.

Investigation & Planning

A comprehensive site inspection is conducted first to assess the property's zoning requirements, site conditions, and development value. This early evaluation provides an understanding of opportunities and potential challenges before starting design.

Schematic Design

Every project is created according to your lifestyle, budget, and property. Our plans for detached ADUs, attached additions, and garage conversions focus on maximizing space, natural lighting, and practical use.

Construction Drawings

Detailed, builder-ready plans that clearly communicate design intent while meeting all structural, safety, and code requirements.

Permitting & Approvals

Local legislation can be a complicated process to navigate. We help create permit-ready documentation and work with local agencies to help coordinate the process and reduce delays.

Construction Oversight

We work alongside your contractor to ensure the ADU is built as designed, protecting both your investment and the integrity of the project.

ADU Options for Homeowners

Each property is different with its own opportunities. We advise homeowners on the best ADU configuration for their site conditions, project objectives, and plans: 

  • Detached ADUsDetached units create independent living space while maintaining privacy between the primary residence and the new structure. They are well suited for rental opportunities, guest accommodations, or multigenerational living.

  • Garage ConversionsTransforming an existing garage into an ADU is an efficient way to create additional housing while making use of existing structures. Thoughtful planning helps maximize functionality without compromising design.

  • Partial Conversions & AdditionsSome properties benefit from combining existing space with carefully planned additions. These hybrid solutions improve flexibility while maintaining a cohesive architectural appearance.

  • Junior ADUs (JADUs) –Built within the existing home, Junior ADUs offer a compact and efficient housing solution. They are ideal for homeowners seeking additional living space with minimal structural changes.

Residential Design That Supports Every Project

Each property is different, and a design always starts with the site’s unique characteristics. We blend thoughtful planning with residential architectural design that helps create a feeling of continuity with the original home while enhancing the enjoyment of contemporary living.

For homeowners considering larger residential projects, our experience with new-build house designs allows us to create cohesive architectural solutions that respond to both present needs and future growth.

Our focus is on designing ADUs that meet local safety standards while holding their value over time.

Why Choose Dwelling Lab?

From Dwelling Lab’s perspective, we think that collaborative work is key to project success. Our relationship with our clients is what allows for creating an architecture that harmoniously combines creative, practical, and durable features of the spaces we design.

It does not matter if you are in search of San Jose ADU builders, exploring information about ADU builders in San Jose, or searching for architectural professionals; we will help you with all aspects, starting with the creation of the concept and ending with permit documentation:

Ready to Plan Your ADU?

With careful planning, an ADU can improve the quality of your life and maximize the value of your home. Call Dwelling Lab for a consultation and start designing your space for your home, your goals, and your future.

    FAQ
    How long does it take to get an ADU permitted?

    Most ADU projects are permitted within 2–4 months, depending on the scope of work, design complexity, and city review timelines.

    ADUs must be at least 150 square feet, with minimum ceiling height requirements, natural light, and proper egress per local code.

    Garage and interior conversions often fall in the $100,000–$150,000 range, while detached ADUs commonly exceed $300,000. Final costs vary based on design decisions, site conditions, and construction pricing.

    Yes. We evaluate existing conditions, prepare corrective plans where needed, and manage the legalization process directly with the city.

    Let’s Design Your ADU

    Your San Jose property holds real opportunity—whether you’re planning space for extended family, creating a rental unit, or building long-term value. Dwelling Lab brings the experience and local knowledge needed to turn that potential into a well-executed ADU.