ADU Construction in Los Gatos, CA

5 specialized services available

GS Design and Build specializes in permitted ADU construction for Campbell homeowners. We handle design, permitting, and full construction of accessory dwelling units. Maximize your property value with a legal, code-compliant ADU.

Call (415) 933-2547

ADU Construction Services in Los Gatos, CA

GS Design and Build specializes in permitted ADU construction for Campbell homeowners. We handle design, permitting, and full construction of accessory dwelling units. Maximize your property value with a legal, code-compliant ADU.

Architectural floor plan and site layout drawing for a detached ADU on a single-family residential lot in San Jose, California. The plan shows the proposed unit footprint, setback lines, and connection to the primary dwelling.

ADU Design & Planning

GS Design and Build provides ADU design and planning services for homeowners in San Jose and Menlo Park.

  • Site-specific design that accounts for your lot's setbacks, zoning district, and utility connections
  • Reduced risk of plan rejection by aligning drawings to San Jose and Menlo Park local standards from the start
  • Design options across ADU types including detached units, garage conversions, and junior ADUs
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A newly permitted detached accessory dwelling unit in a San Jose residential backyard, showing a finished exterior with a side entry door and landscaped pathway. The structure sits within required setbacks on a single-family lot typical of the San Jose and Menlo Park area.

ADU Permitting

GS Design and Build handles ADU permitting for homeowners in San Jose and Menlo Park.

  • Accurate, complete plan packages that reduce the risk of city rejection or resubmittal cycles
  • Zoning and setback review done before design work begins, catching issues early
  • Coordination with San Jose and Menlo Park reviewers so you do not have to manage city correspondence
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A newly constructed detached ADU in a San Jose backyard, showing a finished single-story unit with a private entrance, exterior siding, and a small landscaped path leading from the main residence. The unit reflects a clean, modern build consistent with California residential construction standards.

ADU Construction & Build

GS Design and Build handles full ADU construction for San Jose and Menlo Park homeowners ready to add living space.

  • Adds a fully code-compliant living unit to your existing San Jose or Menlo Park lot
  • Increases property market value by expanding usable square footage
  • Creates a dedicated space for family members without requiring a separate property purchase
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A finished garage conversion ADU interior in San Jose showing an open-plan kitchen and living area with a private entrance door. The converted space features insulated walls, recessed lighting, and a full bathroom visible through an interior doorway.

Garage Conversions

GS Design and Build delivers garage conversions in San Jose and Menlo Park, turning existing garages into fully permitted ADU living spaces.

  • Adds a fully permitted, rentable living unit to your existing property footprint
  • No replacement parking required under California ADU law when converting a garage
  • Increases assessed property value by adding legal habitable square footage
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Interior view of a finished Junior ADU conversion inside a single-family home in San Jose, showing an efficiency kitchen, private entrance door, and compact living area. The space reflects a clean residential remodel built to California JADU standards by GS Design and Build.

Junior ADUs (JADUs)

GS Design and Build constructs Junior ADUs in San Jose and Menlo Park, converting existing home space into a fully code-compliant living unit.

  • Adds a rentable living unit without expanding your home's existing footprint
  • Works within your current structure, reducing site disruption and exterior alteration
  • Qualifies for no additional parking requirement under California state law
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What sets us apart for ADU Construction

15+ Years Residential Construction Experience

Family-Owned and Operated

ADU Specialists

Full Remodel Services

Multi-City Service Coverage

Real Work. Real Results.

Every photo is from an actual project we completed — no stock images, no renderings.

Ready to get started?

Seen the work. Ready to talk about your roof?

Call (415) 933-2547

Common Questions About ADU Construction in Los Gatos, CA

Straight answers to the questions homeowners ask before hiring a local roofing company.

Most ADU projects take 4-6 months from permit approval to completion, depending on size and complexity.

Yes. We manage all Campbell city permits, inspections, and code compliance throughout the project.

Costs vary by size and finishes, typically $150K-$300K. We provide detailed estimates after site evaluation.

Still have questions?

Call us directly. Real answers, no scripts.

Call (415) 933-2547

What Santa Clara County homeowners say.

4.9
52 Google reviews

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From our very first appointment with Gershon, we felt confident we were in excellent hands. He listened carefully to what we wanted, offered thoughtful design suggestions, and walked us through the process and timeline in a clear, transparent way. Every step—from initial design and planning to the finishing touches—was handled smoothly, with consistent updates so we always knew what was happening next. The crew that worked on our home was hard working, professional, and very knowledgeable. They arrived on time, respected our home, and kept the work area as tidy as possible, which we really appreciated. The finished kitchen looks fantastic and functions even better than we hoped and the quality of the workmanship really stands out. Friends and family have already commented on how beautiful and well thought-out the space is. We would not hesitate to hire GS Design & Build again for future projects. If you’re looking for a top-tier contractor for your home remodeling, GS Design & Build are an outstanding choice.

Charles Decker, DC, ACN Google review · June 2026

GS Design and build did an amazing job uplifting my garage. Gheri was the most responsive of the contractors I got quotes from and he was very quick to respond with a reasonable estimate. He was always reachable and ensured the team was very punctual. His crew did a great job completing the job and handling surprises. I didn’t have to contact Gheri for anything during the job. The final work quality was great and my garage looks great! I will highly recommend GS Design and Build for your home improvements Update: i did a bathroom remodel with them 6 months after the garage upgrade and it was amazing! The team has remained consistent with their quality and workmanship!

viswanathan vaidyanathan Google review · June 2026

We used GS Design and Build for a room addition in Redwood City and couldn’t be happier. Geri helped us figure out the best layout for our new sunroom and made sure the style blended with the rest of our house. Her crew worked clean and fast, and everything passed inspection the first time. The project wrapped up on schedule and within our budget. The space gets amazing light and has quickly become our favorite part of the house. If you’re in the market for a room addition contractor who truly listens and executes, don’t look any further.

Ronda Richardson Google review · September 2025

Just got my home addition done! GS design helped us build a new bathroom and a new master bed in new construction. Everything was fully licensed and Geri managed everything at his end. I found Geri on Nextdoor and was nervous before signing him up but to my surprise, I couldn’t have asked for more! He has a lovely team of people who specialize in what they do. Geri cared for me and made sure I am satisfied at each step. He gave me a good run down of what he plans to do in the coming week which was very satisfying. Geri’s rates were also very competitive and he was reasonable when the work order changed. What I liked about Geri a lot is also that his interior designing skills are also very strong so he guided us when the size of the window was off or in making lovely choices of the flooring. You can trust Geri blindly and go with him. You will not regret it. Thanks Geri, for all the great work.

Vedant Dhandhania Google review · April 2022

We live in Redwood City and reached out to GS Design and Build for a second-story room addition. Geri coordinated with our structural engineer and managed the project with confidence. We were impressed with how smoothly everything went. Her communication throughout the process was excellent. The new space has completely transformed our home and given us the extra flexibility we needed. Top-notch room addition contractor and a pleasure to work with.

Deanna Callison Google review · September 2025

Proudly Based in Campbell, CA

Stop by, call, or book online — we're always nearby when you need us.

Hours

  • Monday 8:00 AM - 7:00 PM
  • Tuesday 8:00 AM - 7:00 PM
  • Wednesday 8:00 AM - 7:00 PM
  • Thursday 8:00 AM - 7:00 PM
  • Friday 8:00 AM - 7:00 PM
  • Saturday Closed
  • Sunday Closed