Business Details
Award-Winning Sustainable Architecture in Phoenix
Koss Design & Build is an award-winning architecture and construction firm dedicated to creating timeless, energy-efficient homes through a collaborative, team-oriented process. Founded by Erik Koss, a licensed architect, contractor, LEED accredited professional, and PHIUS certified builder, the company combines modern design principles with sustainable building practices to deliver high-performance residential and specialty commercial spaces. Our team of experts specializes in custom home design, Passive House certification, and Net Zero construction, having completed the only PHIUS-certified home in central Arizona. We prioritize client interaction and satisfaction, offering transparent accounting and open-book project management to build trust from day one.With decades of combined experience, we integrate architectural design, site planning, and construction management to control costs and quality while creating finely detailed, sustainable environments. Our work has been recognized by prestigious organizations, including the American Institute of Architects, and featured in publications like Dream Homes. By focusing on innovation, craftsmanship, and environmental responsibility, we strive to exceed client expectations while advancing the future of sustainable architecture.
Services
Custom Home Design
Sustainable Construction
Passive House Building
Net Zero Homes
Project Management
Highlights and features
- We are Arizona's only PHIUS-certified Passive House builder.
- Our team includes LEED-accredited professionals with decades of experience.
- Transparent accounting ensures client trust and project clarity.
- We integrate design, engineering, and construction under one roof.
- Award-winning work featured in national architectural publications.
Associations and certifications
- PHIUS
- LEED
- Energy Star
What people say
Award-winning craftsmanship
Transparent communication
Energy-efficient homes
Innovative designs
Professional team
Services
Custom Home Design
We create bespoke architectural designs tailored to client lifestyles and site conditions. Our process integrates modern aesthetics with sustainable materials and energy-efficient systems. From concept to construction documents, our team ensures every detail reflects the homeowner's vision while meeting rigorous performance standards.
Passive House Building
As Arizona's only PHIUS-certified builder, we specialize in ultra-efficient homes with 70-90% reduced energy consumption. Our Passive House projects feature advanced insulation, airtight envelopes, and heat recovery ventilation systems. These homes provide superior comfort while minimizing environmental impact through rigorous third-party certification standards.
Net Zero Homes
We design and construct homes that produce as much energy as they consume annually. Combining Passive House principles with renewable energy systems like solar panels, our Net Zero homes achieve energy independence. Projects can be grid-connected or off-grid with battery storage solutions for complete sustainability.
Project Management
Our integrated project management ensures seamless coordination of budget, schedule, and quality. Clients access real-time project updates through our 24/7 online system. Transparent accounting and open communication maintain trust while our team oversees every construction phase from foundation to final finishes.
Sustainable Construction
We implement eco-conscious construction practices using reclaimed materials, low-VOC finishes, and FSC-certified wood. Our high-performance homes prioritize indoor air quality and resource efficiency. Every project balances environmental responsibility with modern design aesthetics to create healthy, durable living spaces.
People
Erik Koss
Founder
Licensed architect and contractor with 25+ years of experience in high-end residential projects. PHIUS-certified builder and LEED-accredited professional who pioneered Arizona's first PHIUS-certified home. Focuses on integrating design and construction for optimal client outcomes.
Carlos Ceballos
Architectural Designer
10+ years of international experience blending German high-performance design with Mexican modernism. Specializes in project management and client-focused solutions. Holds degrees from University of Guadalajara and University of Stuttgart.
Charles Dustin Frey
Construction Manager
15+ years of experience in complex hillside projects and luxury residential construction. Expertise in client communication and technical execution. Previously worked in Southern California and Seattle markets before joining Koss in 2015.
Casey Cyr
Construction Associate
Combines computer science expertise with carpentry skills to solve technical field challenges. Manages time-sensitive project details and contributes to construction management. Brings innovative problem-solving to every build.
Cesar Lopez-Rodriguez
Design+Build Associate
Dual degree holder in Architecture and Construction Management from Arizona State University. Advocates for integrated design-build methodology to achieve project success. Tech-savvy professional with global travel experience informing design perspectives.
Questions
What architectural styles do you specialize in?
We focus on modern, sustainable designs that integrate with natural environments while meeting client-specific needs.
Are you certified for green building standards?
Yes, we're Arizona's only PHIUS-certified Passive House builder with LEED-accredited professionals on staff.
Do you work outside Arizona?
We offer design services in multiple states but typically limit construction projects to Arizona.
What construction process do you use?
Our 5-step process includes discovery, design, documentation, development, and final dwelling phases with continuous client collaboration.
Can you build Net Zero energy homes?
Yes, we specialize in Net Zero homes combining Passive House principles with renewable energy systems.
How do you manage project budgets?
We use transparent accounting and real-time online project management systems to maintain budget control throughout construction.
