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 46 reviews Mia LevyApril 16, 2024Trustindex verifies that the original source of the review is Google. I hired Sam from Bayside Home Improvement for a full bathroom remodel. He gutted my bathroom, moved plumbing, repositioned the vanity and toilet, put in new installation and Sheetrock, added recess lights, installed a new window, and did the tile work from floor to ceiling. I absolutely love the results! The tile work was done perfectly, and the grout lines were neat and even. Sam and his crew were meticulously clean, thorough, punctual, and attentive to our needs. I referred Sam to my family and friends, and he has done great work for them too! I would give him 10 stars if I could. Highly recommend! Daniel HayimApril 16, 2024Trustindex verifies that the original source of the review is Google. Hired these guys to redo our old kitchen and bathrooms after meeting with several contractors, I found on Google and other sites. Avi did a great job explaining the process and did a great job on the design and preparation, which made the work a lot easier. Working with him and his design team really turned out to be a good experience for us. They handled everything from getting the permits to passing inspections, and all the coordination in between. The communication throughout the process was always clear and consistent which gave us a great sense of comfort. After all their finishing work looks excellent and we will be looking forward to hiring them again next year for our exterior projects. Thank you! Jake RamerSeptember 21, 2023Trustindex verifies that the original source of the review is Google. Been working professionally with Sam for the last couple years. Great company who provides quality work. Nick FarakeshSeptember 14, 2023Trustindex verifies that the original source of the review is Google. Great outcome did everything he promised in the contract serena roviraAugust 1, 2023Trustindex verifies that the original source of the review is Google. If your planning on redoing your kitchen, I highly recommend giving this company a call. They did a beautiful job remodeling our kitchen with new cabinets, countertops, floors, lighting, and paint. They were overall easy to work with and very communicative. They also helped us throughout the process with the permits, inspections, and finding the right materials. Our project was smooth and importantly on budget!! Highly recommended giancarlo guzmán gonzálezJuly 13, 2023Trustindex verifies that the original source of the review is Google. Thank you Bayside for remodeling my kitchen! It's something I had planned to do years ago and it's finally a reality: you guys were great throughout the process and appreciate your patience and dedication to detail ???? LauraJuly 3, 2023Trustindex verifies that the original source of the review is Google. I am very happy with the complete bathroom remodel. It was an old and not very modern bathroom, I wanted to change it completely so I hired this company to help. Sam and his team did a wonderful job, they used modern design materials and did an excellent job putting it all together. If you are going to carry out remodeling, I always recommend them ???????? Rob AdamsJune 21, 2023Trustindex verifies that the original source of the review is Google. I 100% recommend Bayside Home Improvement for any type of home remodeling. These guys completely changed my entire kitchen, they used the best material and took care of every detail. We’ll be contacting them again for our bathrooms when we’re ready! Johnny CharniskyJune 13, 2023Trustindex verifies that the original source of the review is Google. I hired this company to get rid of my old deck that was in rotting shape. They did an excellent job removing it and installing our new deck using Trex. Very happy with the way it looks! Aarón mizrachiJune 4, 2023Trustindex verifies that the original source of the review is Google. Thank you Bayside for my new bathroom! They preformed a great job gutting out our old guest tub and turning it into a walk-in shower!