Coates Design Architects

Coates Design Architects + Interiors is an award-winning architecture and interior design firm based on Bainbridge Island near Seattle, Washington. Founded by architect Matthew Coates, the firm specializes in residential, commercial, civic, healthcare, multifamily, and sustainable design projects throughout the Pacific Northwest and across the United States. Coates Design is widely recognized for its commitment to “Responsible Architecture,” a design philosophy centered on creating buildings that positively impact people, communities, and the environment.

Established following Matthew Coates’ internationally recognized success in the 2005 Cradle to Cradle Home Design Competition, the firm has grown into a respected leader in sustainable architecture, combining innovative design strategies with environmentally responsible building practices.

Architectural & Design Services

Services Include:

• Residential architecture
• Custom home design
• Accessory Dwelling Unit (ADU) design
• Guest house design
• Commercial architecture
• Civic and cultural facilities
• Healthcare architecture
• Multifamily housing design
• Interior design
• Space planning
• Programming and planning
• Feasibility studies
• Sustainable design consulting
• Green building design
• Master planning
• Architectural project management

The firm provides comprehensive architectural solutions tailored to each client’s unique goals, site conditions, and project requirements.

Sustainable & Responsible Architecture

Core Principles:

• Do the right thing
• Take the long-term view
• Create designs that benefit the environment, economy, and community
• Promote healthy indoor environments
• Utilize regenerative design strategies
• Reduce environmental impact
• Maximize natural daylighting
• Incorporate energy-efficient systems
• Design for long-term sustainability

Coates Design believes architecture should do more than simply minimize harm. The firm strives to create buildings that actively improve the environment and enhance the lives of those who use them. Their projects often incorporate renewable energy systems, sustainable materials, passive design strategies, and environmentally responsive site planning.

Residential Design Expertise

Residential Services:

• Custom luxury homes
• Modern home design
• Sustainable residences
• Waterfront homes
• Mountain retreats
• Vacation homes
• Home renovations
• Whole-house remodels
• Guest houses
• ADUs and backyard cottages
• Interior transformations

The firm’s residential work balances functionality, beauty, sustainability, and livability. Every home is designed to reflect the client’s lifestyle while responding thoughtfully to the surrounding environment.

Notable Projects

Featured Project Types:

• Custom residential estates
• Sustainable modern homes
• Mountainside Retreat ADU
• Bainbridge Island Museum of Art
• Commercial office buildings
• Healthcare facilities
• Civic and cultural centers
• Educational buildings
• Mixed-use developments

The firm’s portfolio demonstrates expertise across a wide range of project scales and building types while maintaining a consistent commitment to thoughtful design and environmental stewardship.

Why Clients Choose Coates Design

• Award-winning architectural firm
• Nationally recognized sustainable design expertise
• Full-service architecture and interiors practice
• Extensive residential and commercial experience
• Collaborative design process
• Client-centered approach
• Strong focus on innovation
• Commitment to environmental responsibility
• Experienced multidisciplinary team
• Proven record of successful projects

The team works closely with clients throughout every phase of a project, ensuring that design goals, budget expectations, and long-term objectives remain aligned from concept through completion.

Design Philosophy

Coates Design believes that architecture has the power to improve quality of life, strengthen communities, and foster meaningful connections between people and their surroundings. The firm approaches every project as an opportunity to create elegant, innovative, and livable solutions inspired by the client, the site, and the ecological context.

Serving the Pacific Northwest and Beyond

From its headquarters on Bainbridge Island, Washington, Coates Design serves clients throughout Seattle, the Pacific Northwest, California, and other regions across the United States. Whether designing a custom home, ADU, civic building, healthcare facility, or commercial development, the firm remains dedicated to delivering architecture that is beautiful, sustainable, and enduring.