Home Addition & ADUs
De Mattei Construction - Bay Area ADU and Addition specialists
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Your Idea starts here. Come to us with your ADU and Additions ideas and we can help design your dream.
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Construction is our specialty. Building every detail out to perfection. Dream homes are our favorite as we bring dreams to light
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Through various maintenance plans, and an intense inspection process De Mattei homes stand the test of time to be within your family a long time.
Expand Your Space with
De Mattei Craftsmanship
At De Mattei Construction, we understand that your home needs to evolve with your lifestyle. Whether you're welcoming a growing family, creating a dedicated workspace, or planning a luxurious guest suite, our custom home additions and accessory dwelling units (ADUs) are designed to seamlessly blend with your existing architecture while enhancing functionality and value.
Build The Dream
Thoughtfully Designed, Expertly Built
Every addition we build—whether it’s a second-story expansion, an extended great room, or a private in-law unit—is crafted with the same attention to detail and commitment to quality that defines every De Mattei home. From architectural design through final finish, our team ensures the new space reflects the elegance and character of your original home while elevating your daily living experience.
Make it Right
Make it De Mattei
ADUs: Smart, Versatile Living
Accessory Dwelling Units offer a flexible solution for modern living needs. As Bay Area real estate continues to evolve, ADUs present a smart way to add value and utility to your property. Whether you're creating a rental unit, a home office, or a private retreat for guests or family, we guide you through the entire process—from zoning and permitting to design and construction—with clarity and expertise.