Addition Service in washington


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Expand Your Home with Custom Additions
When your home needs more space, a well-planned addition can make all the difference. Whether you’re building out or adding up, we design and construct seamless extensions that add comfort, function, and long-term value.
From room additions and second story additions to sunrooms and garage expansions, we tailor each project to match your home and lifestyle. As a trusted home expansion contractor in WA, we manage everything — from permits to finishes — so your new space feels like it’s always belonged.
What We Build
We handle everything from room additions and garage expansions to second-story and sunroom additions. As a trusted home expansion contractor in WA, we design and build seamless extensions that fit your home and lifestyle.
Room Additions
Add new bedrooms, offices, or family spaces that blend perfectly with your existing home.
Second Story Additions
Build upward with added bedrooms, bathrooms, or full levels for growing families.
Garage Additions
Expand your home’s function and value with custom-built attached or detached garages.
Sunroom Additions
Bring the outdoors in with a light-filled sunroom designed for year-round enjoyment.
Home Expansions
Increase square footage with smart, seamless additions that suit your space and style.
Custom Additions
As a home expansion contractor in WA, we tailor each project to your home and needs.
Let’s Talk About Your Addition
If you’re planning an addition to your home in King County, WA or Pierce County, WA we’d love to hear more. Tell us what you need — and we’ll let you know how we can help.
PLANNING • DESIGN • PERMITS • BUILDING • RENOVATION
A Seamless Home Transformation Journey
Our licensed team delivers start-to-finish remodeling with expert care and precision.
RENOVATION
We specialize in reworking outdated spaces into functional, modern living areas with thoughtful planning, expert craftsmanship, and high-quality materials.
DESIGN BUILD
Our streamlined design-build process combines creative vision with licensed construction, delivering seamless results from first sketch to final walkthrough.
What our customers say
See what homeowners across Washington are saying about their experience with our remodeling and design-build team.
Julio Rangel2025-06-05Trustindex verifies that the original source of the review is Google. We had a leak in our home that completely destroyed our kitchen. We filed an insurance claim, and they only wanted to cover $6000 dollars worth of damages, which was nowhere near enough to repair our kitchen. We were astonished when Donovan said that he could talk to the insurance company for us, and upon him doing so, he brought our insurance carrier up over $20,000! This was enough for us to pull the trigger on some additional work like replacing all of our floors, getting a brand new kitchen, and new railings for our stairs! He helped us pick everything out at various showrooms, and we could not be more pleased with the quality and the look of our remodel. He was on site pretty much every day and made sure the process of building went along smoothly. We are so happy we gave him a call for our insurance claim, and we would definitely hire him again! Bryson Higa2025-06-03Trustindex verifies that the original source of the review is Google. Donovan was our main POC for our house remodel and we couldn't have asked for a better communicator. His consistent promptness and clarity made the renovation process smooth. What truly set him apart, however, was his unwavering commitment to doing things the right way. All projects will inevitably encounter issues, but how those issues are addressed is what truly matters. After a couple of months of using our primary bathroom, we experienced an issue with the shower pan. Donovan promptly made the correct decision to have it completely redone, rather than attempting a localized fix and waiting to see if that resolved the problem. This ensured a high-quality, lasting solution. We also greatly appreciated his strategic approach to hiring, as he consistently brought in specialized tradesmen for specific tasks instead of relying on a generalist. Donovan's dedication to quality, keen eye for detail, and strong customer advocacy are truly exceptional. We highly recommend him for any project where expertise and integrity are paramount. Hunter Trueax2025-05-30Trustindex verifies that the original source of the review is Google. Home Renovation & Design Build stands out as a rare combination of design excellence, construction quality, and true professionalism. They don’t just remodel homes — they reimagine them. From our first interaction to the final walkthrough, their team was organized, transparent, and committed to delivering beyond expectations. Fernal Amaya2025-05-30Trustindex verifies that the original source of the review is Google. Donovan was the project manager for my kitchen remodel. He kept me well informed, made sure I knew exactly what was going in to my home, and stayed on schedule. The entire process was very educational, and even though I feel like construction is always going to be stressful (people coming in to your home to do work for most of the day, lots of noise, hoping everything turns out well, etc.), he did a good job of holding my hand and making me feel comfortable with everything that was going on. All in all, I LOVE my kitchen, and I'm so impressed by his eye for design. Congratulations on starting your own company! I feel like you have an edge in this industry, and I will DEFINITELY be calling you for my next project. Dustin Williams2025-05-30Trustindex verifies that the original source of the review is Google. "HOME Renovation and Design Build led by Donovan, recently completed a full remodel of my bathroom, and I couldn't be happier with the results! From the initial consultation to the final touches, Donovan and his team were professional, communicative, and highly skilled. They listened to my ideas and offered creative solutions that enhanced the overall design. The quality of their workmanship and attention to detail is evident throughout the entire space. What impressed me most was their commitment to staying on schedule and within budget, with no surprises along the way. Donovan ensured the project ran smoothly, and his expertise was invaluable. My new bathroom is not only beautiful but also functional, and it has truly transformed my home. I highly recommend! Nathan Moraru2025-05-29Trustindex verifies that the original source of the review is Google. Genuinely one of the few companies that will fight for you. Doesn’t give any excuses when a problem arises, just works quickly to fix it. Definitely left a good impression and I will reach out again for my next project.
Ready to learn more?
Let’s bring new life to your home — start your remodel with a free consultation today.
Why Choose Us?
- Local, licensed Washington contractors
- Clear communication and honest timelines
- Design-build approach for smoother results
- Experienced team focused on quality and detail
- Respect for your home, time, and budget

Frequently Asked Additions Questions
Our home addition services help expand your living space with rooms, second stories, or extensions that fit your property and needs. Clients often ask about permits, timelines, and how to match new structures with the existing home — we handle all of it. From planning to final build, we manage each phase with precision and communication. Whether you need more space for family, work, or comfort, we deliver additions built to last.
What types of home additions do you offer?
We build room additions, garage expansions, sunrooms, and second story additions in Washington, all tailored to your home and goals.
Will my home addition blend with the existing structure?
Yes, we design seamless home expansions that match your home’s style, materials, and layout for a natural, cohesive look.
Do I need permits for a home addition project?
Yes, most room additions in Washington require permits. As your contractor, we handle all plans, codes, and local approvals.
Can I stay in my home during the addition work?
In many cases, yes. For larger second story additions, we may recommend temporary relocation for comfort and safety.
Are sunroom additions usable year-round?
Yes, our sunroom additions in WA are insulated and designed to be comfortable in all seasons with proper HVAC integration.