West Coast Building and Design builds ADUs in California, including granny flats, garage conversions, and detached units. They help homeowners boost property value, house family members, or earn rental income through structured, process-driven construction.

West Coast Building and Design, Santee, CA

About West Coast Building and Design

ADU Construction Services by West Coast Building and Design

West Coast Building and Design works with homeowners looking to add an accessory dwelling unit (ADU) to their existing property. An ADU is a smaller, often independent residential unit built on the same lot as the primary home. These structures can take several forms, including granny flats, garage conversions, attached ADUs, and basement conversions.

As an experienced ADU contractor serving California, West Coast Building and Design helps homeowners navigate the process of planning and building these additional living spaces. Whether the goal is to house a family member, create a in-law suite, or generate rental income, they work to match the right solution to each homeowner's needs and property.

Why Homeowners Are Choosing ADUs

Accessory dwelling units have been growing steadily in popularity across California, driven by the ongoing demand for housing and the desire to keep family members nearby. Some of the common reasons homeowners pursue ADU construction include:

  1. Increasing overall property value
  2. Providing housing for aging parents or adult children
  3. Creating an additional income stream through rental
  4. Making better use of existing lot space

A detached ADU, sometimes referred to as a backyard cottage or casita, offers a fully separate living space while remaining on the same property. A garage conversion contractor approach, on the other hand, repurposes an existing structure, which can be a more cost-effective path depending on the property layout.

Process and Project Management

West Coast Building and Design places emphasis on how well a project is designed, communicated, and managed from start to finish. As an ADU builder, their approach involves taking a homeowner's concept and working through the planning and construction phases in a structured way.

The success of any new construction project — particularly in the affordable housing space — depends heavily on clear communication and organized project management. West Coast Building and Design aims to bring that structure to each accessory dwelling unit build they take on, whether it's a JADU (junior accessory dwelling unit), a granny flat builder project, or a larger detached unit.

For California homeowners considering adding an ADU to their property, West Coast Building and Design offers the experience and process-driven approach needed to move from initial idea to completed build.

Services

West Coast Building and Design performs the following services

  • Construction

West Coast Building and Design Reviews

Omer Sener

2025-10-27
"I had two ADUs constructed by West Coast Building and Design, one built up from the ground and the other converted from a garage, and they were both done well. Whats more important to me and the reason why I decided on writing a review is the fact that Rene backs his work up. He has responded in a timely manner whenever I had a question in regard to the ADUs even after the contracts were fully completed."

George Sand

2025-06-18
"I recommend West Coast Building and Design. We selected West Coast Building and Design to demolish an existing detached garage and build a custom, Spanish style, 2-story structure with a garage on the first floor and 1,000 sq foot grandparent's suite on the second story. It was a complicated build and we are incredibly happy with the results. Not only are we happy with the results, Rene stayed on budget and was great at communicating, reasonable and helped guide us through the process. He performed the services requested with quality work and provided great value."

Catherine Cebulski

2025-04-18
"I hired West Coast Building and Design to build a multi-generation complex for my family.  This review is part 1 of 3 projects.  The first project was for a 1200 square ft ADU where I would live.  When we first started the ADU the projection for completion was 6 months.  Unfortunately, we were just at the tail end of the pandemic and there were many delays from the city, SDGE, supply chain issues and an unusually very rainy season. Im grateful to have had Rene as the builder because he found ways to work around some of these issues.  He listened to what I wanted even if it meant changing and redoing a few things.  I am now living in my beautiful home.  I look forward to Rene starting on the next project: converting a garage into my sons sensoryOT room."

Pritpal Panesar

2023-08-16
"Westcoast Building and Design built my ADU, which turned up more like a custom home. This is probably the fastest that I have ever seen such a structure built from ground up. Rene Rivera is a professional contractor with decades of experience and it shows in the workmanship. They are reliable, friendly, and go the extra mile to make certain that you get your dream home built. Very competitive in their pricing for what they deliver, and never cut corners when it comes to the workmanship or materials they use. I shopped around before I signed the contract with them as none of the other contractors responded in the manner and professionalism as Rene Rivera. If you are considering building a home, or an addition, I highly recommend Westcoast Design as you will not be disappointed."

Alicia Amdahl

2023-01-17
"Very much appreciated working with Rene! He was very communicative and, with the exception of delayed products due to supply chain, his timelines were realistic and spot on. We are thrilled to have our ADU completed by West Coast Building and Design. We would definitely work with him again!"

Specifics

Opening hours

Monday 9:00AM - 6:00PM
Tuesday 9:00AM - 6:00PM
Wednesday 9:00AM - 6:00PM
Thursday 9:00AM - 6:00PM
Friday 9:00AM - 6:00PM
Saturday -
Sunday -

Location

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