Home Addition Architect Services

Your addition architects.

A black and white image of a custom home residence

At Refine Design Architecture, we specialize in home addition architect services that seamlessly blend new spaces with existing homes. As licensed residential architects in Washington, we collaborate closely to design additions that honor your home's character while meeting local permitting requirements and enhancing your daily living. Our work goes beyond drawings: we choreograph light, views, and circulation between old and new to create meaningful architectural moments that make you pause, reflect, and connect. Our thoughtful home addition architect services, detailed documentation, and personalized approach create expanded 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 collaborates with you to understand your addition vision and assess how new spaces will integrate with your existing home while navigating all legal requirements.

02. Design

This is the good stuff. With your ideas and our design expertise, we develop addition options that feel like natural extensions of your home, exploring floor plans and 3D renderings of the seamless integration.

03. Permits

Your addition design is ready for submission to your local jurisdiction for building permits. We can lead this permitting effort or assist you through the approval process.

04. Construction

We provide detailed construction drawings for your addition, ready for your general contractor to begin building. We help vet builders and coordinate during construction to ensure your addition stays on track.

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.

What is the home addition process?

The home addition process begins with understanding your needs and assessing your existing home's potential. We then move through design development, exploring how new spaces integrate with old. Once design is finalized, we secure permits and prepare construction documents. Finally, we help coordinate with builders to bring your addition to life.

Do I need an architect for my home addition?

While Washington State doesn't always require a licensed architect for additions, we highly recommend professional architectural services for projects that alter your home's structure or footprint. Architects ensure your addition integrates seamlessly with existing architecture, meets code requirements, and maximizes the potential of your investment. Complex additions especially benefit from professional design expertise.

What does a home addition cost to build?

Home addition construction costs vary significantly based on the scope of work, complexity of integration with existing structure, materials selected, and site conditions. Simple additions typically cost less per square foot than complex multi-story additions or those requiring extensive structural modifications. We help you understand cost implications during the design phase to keep your project within budget.

How long does a home addition project take?

Home addition design typically takes 2-4 months, depending on project complexity and the level of integration required with your existing home. Construction timelines range from 3-12 months based on addition size and scope. Permitting can add additional time depending on local jurisdictions. We work to streamline the process while ensuring quality results.

How much do home addition architect services cost?

Our home addition architect services typically range from 8-15% of total construction cost, depending on project complexity and scope of services. This investment includes design development, construction documents, permit assistance, and construction coordination. We provide transparent fee structures and work with you to determine the service level that best fits your project needs and budget.

Why hire an architect for your home addition?

Our home addition architect services ensure your new spaces feel like natural extensions of your existing home rather than awkward attachments. We navigate complex permitting requirements, coordinate structural integration, and design additions that enhance both function and beauty. Our expertise in light, circulation, and spatial relationships creates additions that truly elevate your daily living experience.