Expert Home Addition Builder in Seattle, WA
Experience excellence with innovation on your next home addition. Call today for a completely free interactive consultation.
Licensed and Insured Home / Room Addition Contractor in Seattle, WA
As Seattle’s trusted licensed and insured home addition specialists, we provide the protection your investment deserves. Our comprehensive Washington contractor licensing, liability coverage, and workers’ compensation insurance safeguard every project from, ensuring your addition meets
Room Additions in Seattle
Transform your Seattle home with expertly crafted room additions that seamlessly blend with your existing architecture. Whether you need extra bedroom space, a home office for Silicon Valley work, or expanded living areas, our additions meet Seattle’s building codes and neighborhood standards while creating beautiful, functional spaces that feel like original construction.
Kitchen Addition & Expansions
Expand your Seattle kitchen with custom additions that combine California indoor-outdoor living with modern functionality. Our kitchen expansions integrate new space with existing layouts, incorporating energy-efficient features and bay-friendly materials. From yard extensions to breakfast nook bump-outs, we create kitchens that enhance daily living and boost your home’s value.
Family Room & Living Space Extensions
Create the perfect gathering space with thoughtfully designed living area extensions that capture California’s year-round comfort. Our family room additions feature open-concept designs, natural light, and seamless outdoor flow—perfect for entertaining. We design spaces that reflect your lifestyle while enhancing your Seattle neighborhood’s appeal.
First & Second Floor Addition
Maximize your Seattle property’s potential with strategic floor additions that work within local zoning requirements. Ground floor additions extend living space horizontally for kitchens or master suites, while second story additions provide maximum square footage without sacrificing yard space. Our structural expertise ensures seamless integration with proper engineering and architectural harmony.
Featured Projects
92nd Ave
Elegant dining for a sophisticated gathering.
Redmond Ave
Enhancing comfort, style, and value through quality home improvement projects
Orange Wood
Sleek, modern kitchen design with white cabinets and a long island.
Parkwood Dr
Sleek lines, luxurious materials create minimalist, elegant contemporary spaces.
116th Ave
A private space for relaxation, refreshment, and daily self-care rituals.
Services Areas
Latest Projects
92nd Ave
Enhancing comfort, style, and value through quality home improvement projects with sophisticated, minimalist aesthetic.
Parkwood Dr
Elegant bathroom featuring intricate tile work and classic architectural details, showcasing refined craftsmanship and timeless design.
116th Ave
Sleek lines create minimalist, elegant contemporary spaces.
Redmond Ave
Modern, crisp, striking creating an open and inviting space.
Orangewood Dr
Beautiful heart of the home featuring modern design, seamless integration, and refined architectural details.
How We Can Enhance Your Home With An Addition?
Enhanced Aesthetics
Transform your space with custom design and high-quality materials, elevating the overall look of your property and boosting its curb appeal.
Boosted Property Value
Invest in strategic upgrades and renovations that enhance both the interior and exterior, increasing your property’s market value and attractiveness to potential buyers.
Energy Efficiency
Implement energy-saving solutions like updated windows and insulation, reducing utility costs and creating a more sustainable, eco-friendly living environment.
Modern Amenities
Upgrade to the latest technologies and amenities, ensuring your property remains competitive and appealing with contemporary features and conveniences for enhanced comfort.
Why Choose Bayside Home Improvement?
10 years of construction expertise ensure efficient, high-quality results tailored to your needs.
Our skilled craftsmen use top materials and techniques for lasting, superior results.
We offer personalized services, tailoring every project to meet your specific vision and requirements.
Fully licensed, insured, and committed to delivering consistent, dependable service on every project.


Starting Steps for a Successful Seattle Addition
Begin your renovation with clear goals, a solid budget, and expert planning.
Other Services We Offer


Frequently Asked Questions
What types of home additions can you help with?
We specialize in a variety of home additions, including but not limited to additional bedrooms, expanded kitchens, new bathrooms, home offices, and family rooms. Whether you’re looking to add square footage or reconfigure existing space, we can tailor our services to meet your specific needs.
How long does a home addition project typically take?
The timeline for a home addition project can vary based on the size, complexity, and scope of the project. A straightforward addition might take several weeks, while larger or more intricate projects could extend several months. We provide detailed timelines during the planning phase to manage expectations effectively.
Do I need permits for a home addition?
Yes, most home additions require permits. As part of our comprehensive service, we handle all aspects of the permitting process, ensuring that your project complies with local building codes and regulations. This includes obtaining necessary approvals and inspections to ensure your addition is safe and compliant.
How do you ensure the quality of materials used in home additions?
We prioritize quality and durability in every aspect of our home additions. We source materials from trusted suppliers known for their craftsmanship and reliability. Our experienced contractors and craftsmen ensure that all materials are installed with precision and care, adhering to our high standards of workmanship.
How can I finance a home addition project?
Financing options for home additions can vary depending on your financial situation and the scope of the project. We can discuss various financing options with you, including home equity loans, personal loans, or refinancing options. Our goal is to help you find a financing solution that fits your budget and project needs
Can you match my existing home's architecture for the addition?
Absolutely! We specialize in seamless architectural integration that makes additions look like original construction. Whether your Sunnyvale home is ranch-style, Mediterranean, contemporary, or traditional California architecture, we carefully match materials, rooflines, window styles, and exterior finishes. Our goal is creating additions that enhance your home’s curb appeal and maintain neighborhood aesthetic standards.
How much does a home addition cost in Seattle, California?
Home addition costs in Seattle typically range from $350-$600 per square foot, depending on the type and complexity of the addition. A basic family room addition averages $50,000-$90,000, while master suite additions range from $70,000-$130,000. Second story additions in Seattle can cost $120,000-$320,000+ due to structural requirements and building standards. We provide detailed estimates based on your specific needs, local permit costs, and current Seattle construction market conditions.
EXCELLENT Based on 18 reviews Posted on Rana DanishTrustindex verifies that the original source of the review is Google. Bayside Home Improvement exceeded all our expectations with our complete home remodel. Coral, the project manager, was fantastic - always available to answer questions and quick to solve any issues that popped up. The crew was skilled and respectful, and they turned our outdated house into a modern masterpiece. The attention to detail, especially with the lighting and finishes, was impeccable.Posted on Kashi bhuttaTrustindex verifies that the original source of the review is Google. We hired Bayside for a full home remodel, and the results are absolutely breathtaking! Coral was our project manager and did an outstanding job coordinating the team and managing every aspect of the project. The new open-concept living space and updated bathrooms are exactly what we dreamed of. There was a slight delay with the custom windows, but Coral handled it like a pro and kept us informed throughout. Even the pictures were taken by their professional photographer, which did an amazing work as well. We’re beyond happy with Bayside’s work!Posted on Amina SherazTrustindex verifies that the original source of the review is Google. Bayside Home Improvement transformed our entire house into something straight out of a magazine! Coral, our project manager, was an absolute gem—organized, communicative, and attentive to every detail. From the new flooring to the redesigned layout, everything was completed on time and within budget. We couldn’t believe how smoothly the whole remodel went with Coral keeping us in the loop every step of the way. Highly recommend Bayside for any big project!Posted on Fenroy JecTrustindex verifies that the original source of the review is Google. I couldn’t be happier with the work Bayside Home Improvement did on my kitchen remodel. From start to finish, the team was professional, timely, and detail-oriented. They listened to my ideas and brought them to life better than I could have imagined. I’m thrilled with the results and will definitely be recommending them to my friends and family!Posted on Maryna KedoTrustindex verifies that the original source of the review is Google. My family and I recently embarked on a major home renovation project in our Bellevue home, tackling both our outdated kitchen and bathrooms. We knew it would be a big undertaking, so finding the right local partner was crucial. After careful research and several consultations, we chose Bayside Home Improvement, and we couldn't be happier with our decision! From the initial consultation to the final walk-through, the entire team at Bayside was professional, courteous, and incredibly skilled. Our project manager, Coral, was an absolute gem! He was organized, communicative, and always available to answer our questions and address any concerns. Coral's expertise and guidance were invaluable throughout the entire process. The quality of the workmanship is outstanding. The Bayside team demonstrated meticulous attention to detail, ensuring every aspect of the renovation met our expectations. They were respectful of our home and kept the work area clean and tidy. We were particularly impressed with their ability to navigate unexpected challenges that arose during the project. Coral and his team were quick to find solutions and kept us informed every step of the way, minimizing stress and ensuring the project stayed on track. Our new kitchen and bathrooms are absolutely stunning! Bayside Home Improvement transformed our outdated spaces into modern, functional, and beautiful areas that our family will enjoy for years to come. If you're considering a kitchen or bathroom remodel in the Bellevue area, look no further than Bayside Home Improvement. Their commitment to quality, customer service, and exceptional craftsmanship is unmatched. And be sure to ask for Coral – he's the best! Highly recommend!Posted on yosef genishTrustindex verifies that the original source of the review is Google. As homeowners in both Los Angeles and Seattle, we have experienced our fair share of home improvement projects. My partner and I recently completed a major home remodel with Bayside Home Improvement, and we couldn't be happier with the results! From start to finish, the experience was fantastic, and we're so grateful to the entire team, especially our amazing project manager, Coral. Here's why we give Bayside Home Improvement and Coral a resounding 5 stars: 1. Coral's Expert Project Management: Coral kept our entire project running smoothly from day one. He was incredibly organized and communicative, ensuring everyone was on the same page and that the project stayed on schedule and within budget. His problem-solving skills and proactive approach were invaluable in navigating any unexpected challenges. 2. Exceptional Craftsmanship: The Bayside Home Improvement team is top-notch. The contractors were skilled, professional, and respectful of our home. They took pride in their work, ensuring every detail was perfect. We were particularly impressed with their meticulousness and commitment to delivering high-quality results. 3. Stunning Design: We were thrilled with the final design of our home. It's both beautiful and functional, perfectly reflecting our style and needs. The designers at Bayside clearly understood our vision and translated it into a space we love. 4. Stress-Free Experience: Remodeling can be stressful, but with Coral at the helm, we felt confident and informed throughout the entire process. He addressed any concerns promptly and kept us updated on progress, making the experience surprisingly smooth. We wholeheartedly recommend Bayside Home Improvement and Coral to anyone considering a home remodel. They are a talented and dedicated team who will go above and beyond to bring your vision to life. Thank you, Bayside and Coral, for creating our dream home!Posted on Andrew KushevTrustindex verifies that the original source of the review is Google. Bayside Home Improvement helped us fully remodel our rambler home in Bellevue. The scope of work was floors, two bathrooms, one kitchen trims and paint throughout the interior and the exterior. We are very Happy that we have chosen to go with them as it was very hard choosing a contractor to take on what we think is a complex project. We really enjoyed working with the project manager Coral and his team. We would highly recommend them.Posted on dan VolpertTrustindex verifies that the original source of the review is Google. We hired Bayside Home Improvement to design and construct our new DADU behind our property. They were extremely diligent in the entire process of designing a simple yet beautiful layout, sourcing out the necessary materials and managing the project with full transparency and on time achievement . What we appreciated the most is their dedication to detail orientation during the milestones of the finishes. As adjustment were needed during the construction phase in order to achieve the result as close as possible to the provided designs. We would highly recommend them and will definitely hire them again. Big shout out to their management and team of professionals!Posted on Katrina LainsburyTrustindex verifies that the original source of the review is Google. Absolutely thrilled with my new kitchen renovation thanks to Bayside Home Improvement! From the initial consultation to the final walkthrough, it was a fantastic experience. The design team was incredible. They listened to my needs and created a space that is both beautiful and functional. I especially love the clever storage solutions, the island layout, and the coffee nook. Everything has its place and is so convenient to use. Their team was professional and personable - we even had a few good laughs! They kept me informed every step of the way with their app and made sure the project stayed on schedule and within budget (which helped keep me on budget too 🙂 They truly exceeded my expectations!Verified by TrustindexTrustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more
