Business Details
Sustainable Architecture & Green Building Design in Seattle
CAST Architecture is a Seattle-based firm dedicated to modern architecture, sustainable design, and green building. Our team specializes in creating resilient, durable structures that align with the Pacific Northwest environment. We prioritize responsible resource management throughout a building's lifecycle, leveraging climate and site-specific factors to shape our designs. Our expertise spans LEED, Built Green, Passive House, and Living Building Challenge certifications, helping clients navigate budget, performance, and longevity considerations. We are committed to advancing high-performance architecture through innovative building science and sustainable practices.Our portfolio includes single-family homes, accessory dwelling units, community education facilities, and commercial projects. With a focus on green zoning and affordable housing, we aim to deliver solutions that meet diverse client needs while minimizing environmental impact. Our team includes LEED-certified professionals, Certified Passive House Designers, and specialists in sustainable development standards. We collaborate closely with clients to ensure their projects reflect both functional requirements and ecological stewardship. For over two decades, we have been recognized for our contributions to sustainable architecture through awards and industry leadership.
Services
Green Building Design
Sustainable Architecture
LEED Certification
Passive House Design
Accessory Dwelling Units
Community Development
Commercial Architecture
Residential Renovations
Affordable Housing
Eco-Friendly Construction
Highlights and features
- We specialize in sustainable architecture with 20+ years of Pacific Northwest experience.
- Our team includes LEED-certified professionals and Certified Passive House Designers.
- We prioritize client-specific solutions while maintaining environmental stewardship.
- Our portfolio spans diverse project types from single-family homes to community developments.
- We integrate cutting-edge building science with climate-responsive design principles.
Associations and certifications
- LEED AP BD+C
- LEED Green Associate
- Certified Passive House Designer
- Built Green
- Living Building Challenge
Services
Green Building Design
We create energy-efficient structures using sustainable materials and climate-responsive design. Our approach integrates LEED standards and Passive House principles to minimize environmental impact while maximizing durability. Projects include single-family homes, ADUs, and commercial developments tailored to Pacific Northwest conditions.
LEED Certification
Our team guides clients through LEED AP BD+C certification processes for residential and commercial buildings. We optimize designs to meet energy efficiency targets, water conservation goals, and sustainable material requirements while maintaining budget constraints and functional needs.
Passive House Design
We specialize in Certified Passive House designs that achieve ultra-low energy consumption. Our expertise includes thermal envelope optimization, air-tight construction, and mechanical system integration to create comfortable, high-performance living spaces in diverse climate zones.
Accessory Dwelling Units
We design backyard cottages and secondary units that comply with local zoning regulations while maximizing space efficiency. Our ADUs combine modern aesthetics with sustainable construction methods to provide affordable housing solutions across Seattle and surrounding areas.
Community Development
Our firm delivers mixed-use developments and affordable housing projects that prioritize community needs. We incorporate green zoning principles and sustainable infrastructure to create vibrant, accessible spaces for diverse populations in urban and rural settings.
People
Stefan Hampden
Principal
Stefan leads architectural vision and project strategy with 25+ years of Pacific Northwest design experience. His expertise spans sustainable commercial and residential projects, emphasizing climate-responsive solutions and material innovation.
Matt Hutchins
Principal
AIA-certified architect and Certified Passive House Designer, Matt specializes in energy-efficient building systems. He directs technical design standards and ensures compliance with LEED and Living Building Challenge requirements across all projects.
Rebecca Wilcox
Director of Sustainability
LEED AP BD+C accredited, Rebecca oversees sustainable development initiatives. She develops climate adaptation strategies and implements green building protocols that align with Evergreen Sustainable Development Standards and client objectives.
Elin Headrick
Marketing Director
CPSM-certified professional managing client communications and project visibility. Elin coordinates portfolio presentations and ensures accurate representation of design philosophies across digital and print platforms.
Forrest Murphy
Principal
LEED AP BD+C accredited architect focusing on community-centric projects. He leads affordable housing initiatives and urban development schemes that balance ecological responsibility with social accessibility requirements.
Questions
What architectural styles do you specialize in?
We focus on modern, sustainable designs that integrate with Pacific Northwest environments. Our work emphasizes clean lines, natural materials, and energy-efficient systems tailored to specific climate conditions.
Do you handle both residential and commercial projects?
Yes, our portfolio includes single-family homes, ADUs, community education facilities, and commercial developments. We apply sustainable principles consistently across all project types.
How do you incorporate green building standards?
We implement LEED, Passive House, and Built Green certifications through material selection, energy modeling, and construction waste reduction strategies. Our team includes multiple LEED-certified professionals.
Can you help with accessory dwelling unit (ADU) permits?
Yes, we navigate local zoning regulations and permitting processes for backyard cottages and secondary units. Our designs maximize space efficiency while meeting code requirements.
What geographic areas do you serve?
Primarily Seattle and surrounding Washington State regions. We also collaborate on select projects across the Pacific Northwest where sustainable design principles align with local environmental contexts.
Reviews (3)
Jerry Smith
Aug 11, 2017
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Good vision coupled with an informed and very professional, competent staff. They are also nice people who are easy to work with. Meetings were always on time and concerns and questions received prompt responses. I highly recommend Cast Architecture.
Emily T.
May 04, 2016
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We worked with Stefan Hampden from CAST to design a master suite in our attic. Stefan proposed two designs within our limitations (budget, keeping the house in the vein of its original architecture, considering the way we live and what we like to have as features in our home) and worked steadfastly with us to tweak our chosen design until it was exactly what we wanted. He made several very detailed, complex alterations to the design to satisfy some rather challenging customer requirements and we are extremely happy with the outcome of his entire design. Stefan is very easy to work with, has clear
Michel G.
Jul 29, 2013
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Having worked with CAST over the last several years, I would describe the group as a small, but mighty firm possessing talent, vision, and approachability all with an eye on the budget. They possess that rare ability to make the experience fun and agreeable, yet still have a very keen eye on details both small and large. With CAST, feedback and questions are genuinely heard, carefully thought through, and very interesting solutions are always presented.
