Architecture

Since 2005, Onion Flats Architecture (OFA) has been recognized as an award-winning architecture practice educating, designing, and developing with our sister company, Onion Flats Development, high-performance, energy efficient buildings. Our approach to design and team management provides you with on-time delivery of beautifully designed, cost effective, high-performance solutions that reduce construction schedule delays, ensure on-going operational utility and maintenance savings, and deliver a superior healthy and affordable environment for your building occupants.

Browse our services, view our lectures, and contact us to be your trusted advisor to help deliver your next project and achieve your critical goals.

Consulting

Passive House Certified Consultants

Passive House Expertise - OFA brings deep, hands-on experience in high-performance building. Our in-house team includes Passive House Certified Consultants, Designers (PHIUS + PHI), and Tradesmen with a proven track record in delivering affordable, successful Passive House projects. As architects, developers, and builders, we make Net-Zero-Energy-Capable design standard—not exceptional.

Sustainability Consulting - OFA has championed sustainable design since its inception. Whether it's new construction, adaptive reuse, or renovation, we offer comprehensive consulting grounded in experience—from LEED certification and Passive House standards to pragmatic, commonsense strategies. Our recent focus emphasizes high-performance building envelopes using low-tech, cost-effective materials to maximize impact and affordability.

Modular Construction

OFA has been pioneering modular and panelized construction since the early 2000s—including the ownership and operation of a modular manufacturing facility. This hands-on experience gives us deep insight into the full lifecycle of off-site construction, from design and fabrication to delivery and performance. Our consulting services support clients in modular planning, site suitability, financial analysis, and manufacturer selection. By integrating Passive House principles and scalable retrofit strategies, we help advance replicable, high-performance solutions that promote equity, efficiency, and long-term resilience.

Deep Energy Retrofit (DER)

With nearly three decades of expertise in development, manufacturing, and high-performance retrofits, OFA offers comprehensive architectural design solutions and construction administration, as well as consultation and guidance to Owners and other design teams throughout the lifecycle of their projects.

As a Solution Provider engaged by RMI (formerly Rocky Mountain Institute) for their REALIZE Program, OFA is at the forefront of developing a pre-manufactured Deep Energy Retrofit (DER) building wrap solution to address our nation’s inefficient building stock. We are actively engaging and helping to expand a network of panelized envelope fabricators and builders to deliver high-performance retrofits to our clients.  Additionally, OFA is developing a DER feasibility costing tool in collaboration with RMI, facilitating early project feasibility assessments and guiding clients through the initial project phases.