Expert ADU Construction Services in Los Angeles County, CA.

Maximize Your Property with a Custom-Built ADU

At SAN MARCOS CONSTRUCTION INC., we specialize in designing and building high-quality Accessory Dwelling Units (ADUs) tailored to your needs. Whether you want extra living space, rental income, or a private guest house, our team delivers efficient, modern, and fully compliant ADU solutions backed by over 30 years of experience.

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What Is an ADU and Why Is It a Smart Investment?

An Accessory Dwelling Unit (ADU) is a secondary housing unit built on your property that can serve as a rental unit, guest house, or additional living space. ADUs have become one of the most popular ways to increase property value while maximizing functionality.

At SAN MARCOS CONSTRUCTION INC., we help homeowners turn their unused space into fully functional and beautiful living areas designed to fit their lifestyle and long-term goals.

Why Invest in an ADU?

Building an ADU is a smart way to increase your property’s value and versatility. It provides additional income opportunities, extra space for family members, and long-term flexibility. ADUs are also a cost-effective alternative to buying a new property, allowing you to make the most out of your existing space.

Why Choose Us for Your ADU Project

With over 30 years of experience, SAN MARCOS CONSTRUCTION INC. brings unmatched expertise to every ADU project. We focus on quality craftsmanship, efficient project management, and clear communication from start to finish. Our bilingual team ensures a smooth experience, while our commitment to excellence guarantees results that add value and comfort to your property.

Our ADU Services

Custom ADU Design & Planning

We work closely with you to design an ADU that fits your property, needs, and local regulations.

Garage Conversion ADU

Transform your existing garage into a comfortable and modern living space.

Detached ADU Construction

Build a brand-new standalone unit with complete privacy and functionality.

Attached ADU Construction

Expand your current home with a seamlessly integrated ADU addition.

Our Process

Our Simple and Efficient Process

How it works

Consultation & Estimate

We discuss your vision, evaluate your property, and provide a free estimate.

Design & Planning

Our team creates a customized plan that meets your needs and complies with local codes.

Construction Phase

We handle everything from foundation to finishing with precision and care.

Final Delivery

We ensure every detail is completed to your satisfaction before delivering your new ADU.

Start Your ADU Project Today

Ready to add value and functionality to your property? Let SAN MARCOS CONSTRUCTION INC. bring your ADU vision to life with expert craftsmanship and reliable service.

Call (323) 809-0935 Now for a Free Estimate