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Accessory Dwelling Units


West Coast Building and Design – Affordable Accessory Dwelling Units and Professional Custom Home and Addition Builders in San Diego

West Coast Building and Design is an experienced Accessory Dwelling Unit, Custom Home and Addition Contractor in San Diego, CA, we are San Diego’s Affordable ADU Builders. Adding a ADU to your house is an affordable, practical way to provide more space for your family as well as bring in potential rental income. Room additions can be more cost-effective than many other remodeling projects. If you are looking for an affordable ADU builder in San Diego you’ve come to the right place. Call us today if you and we can give you a free consultation. We are here for you!

As one of San Diego County’s leading Accessory Dwelling Unit Builders, West Coast Building and Design has built all sorts of beautiful homes and ADU Accessory Dwelling Units in San Diego. West Coast Building and Design offers a comprehensive list of custom home additions and extension services in San Diego. Our San Diego ADU builders can tackle all projects, from big to small, and provide advice on affordable home additions. Get peace of mind knowing that you will have trusted and high-quality professionals submitting estimates for your ADU, Home Additions or Custom Home. The key to a good home addition design or ADU is to make it look as if it was always part of the original structure. We have extensive knowledge and experience with home additions and second story home additions for San Diego homeowners, and we promise to get the job done on time and within budget. If you’re looking to do an Accessory Dwelling Unit, Custom Home or build a home addition in the San Diego area consider hiring West Coast Building and Design.

Our mission is to bring you a well-organized team from design to kitchen finishes, our staff are trained project managers that will we provide homeowners with written estimates broken down with a job timeline and budget.

Looking for Affordable ADU Builder or home contractors to build your custom homes or additions in San Diego? Contact Rene Rivera at West Coast Building and Design today to schedule an appointment.

Why Choose West Coast Building And Design

Accessory Dwelling Units & Room Additions

In 2016, California’s standards and laws for ADU’s changed in favor of the homeowner. Now is the time to capitalize on these changes to add additional value to your property. Allow us to assist you to realize the full potential of your investment.


We provide design, planning, materials selection, installation and complete project management for your remodel project.

Residential Construction

Our highest priority is maintaining our impressive track record of completing projects on time and within budget while accurately interpreting and incorporating our client’s vision.

Bathroom Remodel

A custom remodeled bathroom can easily become your own private oasis – a personal spa with all the amenities, or maybe a luxurious guest bathroom filled with tranquility. 

Kitchen Remodels

Bring us your big ideas, your aspirations for your dream kitchen – no job is too big for us. Whatever the remodel, a West Coast Building and Design kitchen remodel consultant works closely with you through the four stage design process to define your vision.

Commercial Construction

Our seasoned team of experts are thoroughly trained and licensed to create spectacular businesses building designs that fit all your needs.

Our Construction Process

Success in any affordable new construction project comes down to how well the process is designed, communicated and managed. This is how we take your ideas and turn them into reality.

Feasible Study

Your experience with West Coast Building & Design begins with a consultation. We understand your project and vision for it is everything to you. We work very closely with our clients to turn their dream project into reality. This is where we excel.

West Coast Building and Design Home Addition in the process of being Built from schematic for new construction

During the planning process close communication is paramount and we regularly collect feedback from our clients. Do they agree with the direction of the planning process? If not, how could it be refined?

West Coast Building and Design work on a scaffold lath project to create a beautiful ADU, otherwise known as an Accessory Dwelling Unit

Project Management is the backbone that drives a successful project build. Our top priority is to communicate your needs to our dedicated team keeping them engaged with your projects’ goals and timelines.

Start Your Construction Project With Us.

ADU Construction Examples

affordable home addition in san diego via the West Coast Building and Design team. They created an ADU, or an Accessory Dwelling Unit

ADU Builders in San Diego

Our expertise in both the Southern California and Bay Area markets serves to make us a more well rounded company with innovative solutions and expert understanding in the process of quality and strategic building construction.