- 650-287-4202
- info@seaconstruction.com
- 763 Polhemus Road Suite 1, San Mateo
Looking for more space without leaving the home you love? SEA Design & Build is your trusted Bay Area home addition contractor. We specialise in designing and building custom room additions, second-story additions, and full home extensions that seamlessly integrate with your existing space. Our design-build process covers everything—from concept and permits to construction and finishing—ensuring your project is completed on time, within budget, and to the highest standard. Whether you want to expand your living room, add a new bedroom, or create a modern home office, our team delivers functional, stylish additions that increase comfort, value, and lifestyle appeal.
Every home addition starts with your goals. Whether you’re dreaming of a larger kitchen, an extra bedroom, or a sun-filled family room, our Bay Area design-build team takes the time to understand your lifestyle and what you want to achieve. We transform your vision into a detailed plan that balances function, style, and budget—creating a seamless addition that feels like it was always part of your home.
With decades of combined experience, SEA Design & Build is a leading Bay Area contractor for home and room additions. Our in-house team of architects, designers, and builders manage every stage of the process—planning, permits, design, and construction—so you don’t have to juggle multiple contractors. We specialise in creating seamless additions that enhance both the beauty and functionality of your home while maximising long-term value. From single-room extensions to full second-story additions, we deliver craftsmanship, precision, and results you can trust.
Every successful home or room addition in the Bay Area begins with a comprehensive consultation. Our design and construction experts take the time to understand your goals, lifestyle, and budget, offering personalised guidance and creative solutions tailored to your space. Through thoughtful planning and collaboration, we help you visualise the possibilities — ensuring your new addition blends seamlessly with your home’s architecture while enhancing comfort, function, and long-term value.
Every homeowner has a unique vision for how their space should grow. Our architects and designers work closely with you to translate your ideas — from expanding a single room to adding an entirely new level — into detailed, buildable plans that balance aesthetics, functionality, and budget.
We guide you through every design decision, from floor layouts and structural details to materials, colour palettes, and finishes, ensuring your new addition feels cohesive and true to your home’s character. With transparent cost breakdowns and thoughtful planning for contingencies, you’ll have complete confidence and clarity throughout the home addition process in the Bay Area.
Every home and room addition deserves a seamless process from concept to completion. Our experienced team manages every stage — from architectural planning and structural design to construction and finishing — ensuring your project stays on time, on budget, and aligned with your vision.
Through clear communication and expert project management, we handle every detail with precision and care. The result is a beautifully designed and skillfully built home addition in the Bay Area that enhances functionality, complements your existing architecture, and adds lasting value to your property.
A home or room addition is more than extra space — it’s an opportunity to reimagine how you live. Our tailored approach blends thoughtful design, functionality, and craftsmanship to create spaces that enhance comfort and complement your home’s natural flow. Using quality materials and intelligent planning, we build seamless additions that expand your lifestyle, increase your home’s value, and feel like they’ve always belonged.
Let’s bring your vision to life with a thoughtfully designed home or room addition that blends timeless style, functionality, and lasting quality. Whether you’re creating more room for family, adding a new level, or building your dream space, we’ll guide you from concept to completion. Reach out today to start your home addition journey in the Bay Area — your vision, expertly built.
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
