Home Addition Architect

The home addition architect.

A black and white image of a custom home residence

At Refine Design Architecture, we specialize in transforming existing homes through thoughtfully designed additions that honor your home's character while expanding its possibilities. As licensed home addition architects in Washington, we collaborate closely with you to create seamless extensions that feel like they've always belonged. Our work goes beyond simply adding square footage: we choreograph light, views, and circulation to create memorable architectural moments that make you pause, reflect, and connect with the world around you. From intimate family room expansions to comprehensive multi-story additions, our high-caliber design, detailed documentation, and personalized service craft spaces your family will cherish for generations.

Meet our Residential Architect Team

What can we do for you?

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01. Pre-Design

This is where we get on a first name basis. Our team of architects collaborates with you to understand your addition vision and goals, while verifying zoning requirements and structural feasibility for your existing home.

02. Design

This is the good stuff. With your ideas and our design expertise, our team puts together several addition design options that seamlessly integrate with your existing home while exploring new floor plans in 3D.

03. Permits

At this point, your addition design is ready to be submitted to your local jurisdiction to obtain necessary building permits. We can lead this effort, or assist you in obtaining permits for your home addition project.

04. Construction

Lastly, we provide you with construction drawings detailed for your general contractor to build your addition project! We help vet builders and coordinate during construction to ensure your addition integrates flawlessly with your existing home.

Don't just take our word for it.

Here's what our clients have to say.

"RD's team provided us with a very special creative process designing our home...If you are seriously looking to elevate your next project, work with Refine Design!"

Shy F.

Mountain Lodge

"Stone and Julia were very professional and extremely helpful in designing our project. Their patience and attention to detail were integral in configuring a change of use building."

Dustin D.

Ballard DADU

"They not only helped bring our vision to life, but offered a point of view we had not thought of. I highly recommend this duo - they are incredibly easy to work with."

Kendall F.

Gig Harbor Remodel

"No words can describe how exceptional Julia and Stone are at their work...Not only did they research extensively into the building codes but they poured so much thought into the design."

Yu Chi S.

Seattle Bathroom Remodel

"It was great working with Refine Design Architecture for our cabin expansion. They listened to our requirements, offered feedback and produced designs that fulfilled our vision"

Antonio G.

Leavenworth Cabin Addition

"Their work was on schedule, on budget, and their ideas were very helpful. If you're searching for an architectural team that can fit the bill, look no further."

James M.

Accessibility Retrofit

Have questions?
We have answers.

At Refine Design Architecture, we believe that every home addition project is unique, with its own opportunities and challenges to navigate thoughtfully.

What is the home addition design process?

Our home addition process follows a proven path: initial consultation and feasibility assessment → design development and integration planning → permit preparation and submission → construction documentation and builder coordination. Each phase builds upon the previous, ensuring your addition enhances both the function and character of your existing home. We work closely with you throughout to refine the design and address any structural or zoning considerations that arise.

Do I need an architect for my home addition?

In Washington State, architects aren't always legally required for home additions, but they're highly recommended for most projects. Home additions involve complex considerations like structural integration, zoning compliance, and design cohesion that benefit greatly from professional expertise. An architect ensures your addition not only meets building codes but also enhances your home's value and livability. For additions over certain square footages or involving structural changes, professional design becomes even more critical.

How much does a home addition cost to build?

Home addition construction costs vary significantly based on the scope, complexity, and level of integration required with your existing home. Factors include the size and type of addition, structural modifications needed, material selections, and site conditions. Kitchen and bathroom additions typically cost more per square foot due to plumbing and electrical requirements. We help you understand these cost drivers early in the design process so you can make informed decisions about your project scope and budget.

How long does a home addition project take?

Home addition projects typically take 2-4 months for design and permitting, followed by 4-12 months for construction, depending on scope and complexity. Simple single-story additions move faster than multi-story or structurally complex projects. The integration work required with your existing home can add time but ensures a seamless result. We work efficiently through each phase while maintaining the attention to detail your addition deserves.

What does a home addition architect cost?

Home addition architect fees typically range from 8-15% of construction cost, depending on project complexity and scope of services. We offer both percentage-based and fixed-fee structures based on what works best for your project. Our comprehensive service includes design development, permit assistance, and construction coordination. The investment in professional design pays dividends in a well-integrated addition that enhances your home's value and your family's daily experience.

Why hire an architect for your home addition?

A skilled home addition architect brings thoughtful design that seamlessly integrates new spaces with your existing home's character and flow. We navigate complex permitting requirements, coordinate structural considerations, and ensure your addition feels intentional rather than tacked-on. Our expertise in light, views, and circulation creates additions that don't just add space—they elevate your daily living experience. The result is an addition that feels like it was always meant to be part of your home.