+ Construction

KOSS design + build

Koss design+build is an architect led building team dedicated to timeless design and sustainable building. Founder, Erik Koss, is a licensed architect, contractor, LEED accredited professional and PHIUS certified builder who believes passionately in the value of a true design + build process; this premise guides the firm today. 

Architecture:  Our philosophy is simple, modern design and construction for a sustainable world.  Whether you already have a designer on your team or need us to handle the design, we’ll work with you to create an inspired project.

Construction:  A balance between time, money, and craftsmanship, controlled through organization, teamwork, and experience.  Open book, transparent accounting is how we structure all our projects, we earn your trust from day one.

Design+Build: Blending aesthetics with building performance is at the heart of what we do.  When done properly this formula creates beautiful, healthy, high performing homes.  Regardless of size or budget that objective never changes.

Service:  Your success is our success.  Client interaction and satisfaction are guiding principles in everything we do.


Our services listed below can be stand alone or in collaboration with other architecture, design, and construction firms. Koss design+build design and management services are available in multiple states. Our construction services are typically limited to Arizona.

Providing both design & contracting services allows us to control cost & quality throughout the duration of the project, while creating finely detailed homes & buildings. All projects, regardless of size and budget, are rooted in sustainable ideals conceptualized during design & brought to life in the build process.

Pre-Construction Services
Building/Home Design & Interiors
Construction Administration


Passive House

Koss design+build is a member of the Passive House Alliance, is one of only two certified Passive House builders in all of Arizona and is the only certified Passive House builder in the Phoenix metro area.  Passive House is a unique, third-party building standard focusing on energy efficiency, superior indoor air quality and thermal comfort.  A typical Passive House building will consume 70% – 90% less heating and cooling energy than a typical code built home.  Site planning, super-insulation, pre-conditioned fresh air, tight envelopes, advanced building skins and thermal bridge analysis are some of the main components of any Passive House project.

Net Zero

Designing and building projects to a net zero level is an option we review on every one of our projects.  A net zero building can produce all the energy it will consume over the course of year.  Often net zero homes can create more energy than they use.  When paired with battery systems, net zero homes can be off grid if needed.  Many of the same principals used in Passive House certified projects are used on net zero homes.  Passive House certification, however, is not required to be a net zero residence.  Renewable energy sources, typically solar, are used to bridge the gap from a high-performance home or energy efficient home to a net zero residence.


High Performance, Healthy Homes

Regardless of budget, aesthetics, or energy efficiency goals, we collaborative with all project team members to create beautiful, high performing, healthy homes that meet the specific goals of our homeowners.  Consultants and subcontractors are specifically selected for each project to insure we are using the best tool for the job.

Limiting Volatile Organic Compounds (VOCs) and other specific chemicals such as formaldehyde are common requests from some of our clients.  Using sustainably sourced materials such as FSC certified veneers and reclaimed wood as well as recycled products are just a few of the ways we work to create healthy, more sustainable homes.


We approach each project with a 5 step process
that delivers quality and excellence to all of our clients.


Let’s meet at your project site or our office.  Once we get to know you and your project we can prepare a detailed proposal.


During the design phase we analyze your goals, the project site, review code/budget parameters and develop the project design concept.


The documentation phase is where we generate the drawings, specifications and documents that will be used to build, estimate, and permit your project.


Throughout construction we orchestrate the budget, schedule, and craftsmanship to construct your one-of-a-kind, custom home.


Move in and enjoy!