- 650-287-4202
- info@seaconstruction.com
- 763 Polhemus Road Suite 1, San Mateo
An Additional Dwelling Unit (ADU) is a smart solution for adding more living space and boosting your property’s value. Whether you’re considering a backyard cottage, in-law suite, rental unit, or private home office, SEA Design & Build specialises in custom ADUs across the Bay Area. Our design-build team manages every step—from concept and permits to construction and finishing—so your ADU blends seamlessly with your property. With thoughtful planning and expert craftsmanship, we deliver ADUs that enhance comfort, functionality, and long-term investment potential.
Building an Additional Dwelling Unit (ADU) is about creating space that works for your lifestyle. Whether you envision a rental unit for extra income, a private suite for family, or a detached home office, we start with your goals and transform them into a clear plan. Our Bay Area design-build team ensures your ADU complements your property while giving you the freedom, flexibility, and function you need.
At SEA Design & Build, we specialize in creating Additional Dwelling Units (ADUs) that combine smart design with lasting quality. Our Bay Area team manages every stage of the process—feasibility studies, permits, design, and construction—so your project runs smoothly from start to finish. We focus on maximising space, energy efficiency, and functionality while ensuring your ADU blends seamlessly with your existing home. From compact backyard cottages to spacious in-law suites, our expertise delivers ADUs that add comfort, flexibility, and long-term value.
Every successful ADU project in the Bay Area begins with a detailed consultation. Our team takes the time to understand your goals — whether you’re creating a rental unit, a guest suite, or extra living space for family — and provides tailored guidance and creative solutions that fit your property, lifestyle, and budget.
More than just builders, we’re your partners in design and construction. With an experienced team of architects, designers, and craftsmen, we guide you through every step of the ADU design and build process — from initial concept and site planning to material selection, permitting, and flawless execution.
Every homeowner has a unique vision for how their ADU should look, feel, and function. Our architects and designers collaborate with you to bring those ideas to life — from maximising limited space to integrating your new unit seamlessly with your main home. Each plan is carefully crafted to balance aesthetics, practicality, and budget.
We guide you through every design decision, including layout, materials, finishes, and fixtures, ensuring a cohesive and timeless look that complements your property. With transparent cost breakdowns and careful planning for contingencies, you’ll have complete confidence at every stage of your ADU design and construction process in the Bay Area.
Every ADU project deserves a seamless process from start to finish. Our team oversees every stage — from architectural planning and permitting to construction and finishing — ensuring your project stays on schedule, within budget, and true to your vision.
Through clear communication and expert project management, we handle every detail with precision and care. The result is a beautifully designed and expertly crafted Accessory Dwelling Unit in the Bay Area that enhances your property, provides functional living space, and adds lasting value to your home.
A custom ADU is more than an additional structure — it’s a flexible, high-value extension of your home. Whether designed for guests, family, or rental income, a well-planned Accessory Dwelling Unit enhances functionality, increases property value, and offers long-term versatility. Our expert team combines thoughtful design, efficient layouts, and quality craftsmanship to create an ADU in the Bay Area that perfectly complements your lifestyle and your home.
Ready to add more space, flexibility, and value to your property? Let’s create a custom Accessory Dwelling Unit that blends thoughtful design, efficient functionality, and lasting quality. From concept to completion, we bring your vision to life with expert planning, craftsmanship, and care. Start your ADU project in the Bay Area today — your vision, built with precision.
Our greatest measure of success is the feedback we receive from our clients. With consistently positive reviews, homeowners praise our attention to detail, clear communication, and accountability throughout every stage of the process. We’re proud to have built a reputation based on trust, professionalism, and results that exceed expectations.
Complete the form, or call us to
set up an in-home consultation.
763 Polhemus Road Suite 1
San Mateo CA 94402
650-287-4202
