ON Design & Remodeling is a Bay Area ADU builder offering home additions, garage conversions, granny flats, and in-law suites. They help homeowners expand living space, boost property value, and generate rental income.

ON Design & Remodeling – ADU Contractor in San Jose, CA

About ON Design & Remodeling

ADU Builders and Home Additions in the Bay Area

ON Design & Remodeling is a Bay Area-based company that designs and builds custom spaces aimed at expanding a home's functionality, style, and overall value. Their services cover a range of residential expansion projects, from full home additions to accessory dwelling units (ADUs) and garage conversions.

As families grow, the need for additional space becomes a practical reality. Home additions and extensions can increase usable square footage, improve the layout of a property, and add measurable value. Whether the goal is a second-floor addition or simply an extra room, ON Design & Remodeling works with homeowners to develop a plan that aligns with their specific budget and vision.

The company brings together designers, architects, and engineers to create the framework for each project, while their construction team handles the build. Project management is handled with attention to detail throughout the process.

Accessory Dwelling Units and Granny Flats

ON Design & Remodeling also builds ADUs, commonly referred to as granny flats, in-law suites, or in-law units. These self-contained living spaces are a practical way to increase a property's value. For homeowners interested in generating rental income, an accessory dwelling unit can serve as a rentable space for a tenant.

As an experienced ADU contractor in the Bay Area, ON Design & Remodeling approaches each project with the goal of delivering a space that fits the homeowner's needs while meeting local planning and building requirements.

Adding More Rooms and Garage Conversions

For homeowners looking to expand within their existing footprint, ON Design & Remodeling offers room additions that integrate new spaces with existing ones. Using quality building materials and construction practices, they work to combine old and new areas in a cohesive way.

Another option the company offers is garage conversion. Converting a garage or barn into a livable space is often a more straightforward process compared to building a full addition. It can be a cost-effective way to gain extra square footage — whether for a home office, gym, or additional living area — with fewer planning complications.

  1. Custom home additions and room expansions
  2. Accessory dwelling unit (ADU) design and construction
  3. Granny flat and in-law suite building
  4. Garage conversion contracting
  5. Second-floor additions

ON Design & Remodeling serves homeowners across the Bay Area who are looking to expand their living space through thoughtful design and reliable construction.

Services

ON Design & Remodeling performs the following services

  • Architecture & Design
  • Construction

ON Design & Remodeling Reviews

Chandrasekhar Poorna

2026-02-07
"We chose ON Design for our Master bed and bath remodeling project, after getting estimates and feed back from previous clients on them and few other remodeling firms. Raz was our point man from the get go and I cant say enough good things about how accommodative and helpful he was throughout the project. He and his On-team helped us get the plans and permits. They worked with us to get all the fixtures and finished material. His construction team helped us move furniture to get the space ready. He even planned out the most disruptive or noise making work to get done when we were on a short vacation.Their construction team with Vincente and Martin was easy to work with and they would respond to changes we requested diligently. We are so glad we chose On Design and are thrilled with how our bedroom and bathroom remodel turned out. We thank you so much for completing this project and appreciate all of your team effort and hard work."

Nihal M

2025-06-27
"We are very pleased with On Design remodeling. They remodeled two of our bathrooms after we had a major water leak. Sofia was our project manager. Very helpful, professional and knowledgeable. She gave us wonderful advice for remodeling and helped us choose all the materials we needed. She went several times with us to shops to help us get materials. And she stopped by every day to check on the work being done. Her working team including Vincent along with all his workers were amazing. Always showed up on time, very polite and if there were any small issues they would take care of it right away. They finished the project in a very short time. And did a beautiful professional job. We were very impressed. We highly recommend this company to anyone who wants a good quality job done on time! Thanks so much! The Mansours in Sunnyvale"

Diane Malmstrom

2024-11-12
"I contacted ON Design Remodeling to help bring some much needed curb appeal to my recently purchased manufactured home, and Im so glad I did! I chose them because of their many wonderful reviews, as well as their work ethic. I am so pleased with the results, and now Im happy to add my own 5 star review. My project manager, Raz, was a pleasure to work with! He listened to my vision, and happily answered my many questions. He was on site often making sure things were progressing nicely and to make sure that I was 100 satisfied with the work. The crew was on time and worked hard every day, and I could tell they took care to make sure every detail was just right. It turned out nicer than I could have ever imagined. The online accounting system was smooth and easy to use, and I knew exactly what was due and when, making my recordkeeping a breeze. It was nice that the payments were staggered at each phase of the job. My neighbors are raving about the work, and my new curb appeal! I have such a smile on my face when I come home at the end of the day to see my vision come true. Thank you ON Design team!"

FRANCISCA SOFÍA FIGUEROA

2022-02-08
"I cant thank enough to ON design Remodeling, and especially to Raz and Aviv my project managers. It was my first major remodeling in the house and I was a little nervous in the beginning, but they met me at my house for the consultation and I felt that there is someone to trust from the first moment. During the project they were always there and responsive to all of my familys questions, they shared a lot of photos and videos in our communication group and kept us in the loop. I am IN LOVE with my new dream kitchen! Highly recommend to any of you like me that looking for a good company that you can trust to make the whole remodeling to a very exciting experience."

Caryne Michaelsen

2021-12-16
"ON Design Remodeling did a great job on our home. We compared them to a few other contractors and they had a very competitive price quote. They were responsive to all of our questions and even came back to make a few requested adjustments after the job was complete. Our Kitchen and living room looks just gorgeous now and we'd recommend them to friends and neighbors."

Specifics

Opening hours

Monday 8:00AM - 6:00PM
Tuesday 8:00AM - 6:00PM
Wednesday 8:00AM - 6:00PM
Thursday 8:00AM - 6:00PM
Friday 8:00AM - 3:00PM
Saturday -
Sunday -

Location

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